1. Introduction
Throughout human history, earthquakes have often caused great loss of life and material destruction
[1]. The need for architects and engineers to take earthquake resilience into account in their designs is becoming increasingly critical as urbanization keeps growing and more people move into earthquake-prone areas. Architectural earthquake-resistant designs are necessary to protect building integrity and occupant safety during seismic disasters.
Many studies, like Welsh-Huggins and Liel
[2], Joyner and Sasani
[3], Hashemi et al.
[4], and Achour et al.
[5], have studied the structural considerations needed and materials’ potential in resisting earthquakes, which concern structural calculations, material selection, and connection details. Moreover, a study by Arnold et al.
[6] divided the architectural decisions that may influence seismic resistance into three main categories: “the building categories, structurally restrictive detailed architectural design, and hazardous nonstructural components”
[6]. By the first category, he meant the building’s size, shape, and proportions in three dimensions, as well as internal planning and the overall architectural shape. The second category refers to the design of building elements, like columns or walls, that may have a negative impact on structural detailing and contradict safe seismic design principles. The latter, the nonstructural elements, are the responsibility of the architect to design, as if they are not sufficiently constructed against seismic forces they could pose a risk to human life. That is part of the responsibility of architects: to maintain the harmony between logic and beauty while simultaneously balancing form and function
[7]. Another study discussed the relationship between architectural and structural design as “an integrated design procedure into which structural and architectural aspects merge harmoniously”
[8]. The study highlighted the development of base isolation design in Italy, highlighting advancements throughout the past 30 years, from the earliest groundbreaking cases to contemporary solutions.
A variety of cutting-edge engineering concepts, tools, and approaches are used in modern seismic design procedures to increase the resilience of infrastructure and structures to earthquakes. Due to significant research, knowledge gained from previous earthquakes, and developments in engineering and materials science, these strategies have changed over time. Performance-based design, base isolation, energy-dissipation technology, seismic bracing and shear walls, innovative materials, and others are just a few examples
[9][10]. However, some controlled damage is to be anticipated, and after enough shaking this damage may render the building unable to be economically repaired
[11]. New technology can significantly lower earthquake-related hazards by improving our capacity to anticipate, plan for, prepare for, reduce, and respond to seismic events. Several recent technological advancements can help lower the risk of earthquakes; one is base isolation. Base isolation demands using energy-dissipating isolation devices to keep the structure elevated off the ground
[12]. Another contribution of new technology to earthquake-resistant design is numerical simulations of real-world events. This is a computer simulation or computational modeling technique used to replicate real-world phenomena using mathematical equations and computer algorithms. It involves creating a virtual representation of a physical system or process and then using numerical methods to solve the mathematical equations that govern the behavior of that system
[13]. Numerical simulation can assist seismic designers in many ways. The dynamic behavior of structures under different earthquake-loading situations can be modeled using numerical simulations. Engineers can foresee how various construction materials, arrangements, and support systems may react to ground trembling
[14]. This helps the designers in their design optimization and structure responses
[15][16], risk analysis
[17], retrofitting strategies
[18], nonlinear behaviors of materials
[19], and cost-effective solutions
[20].
2. Earthquake Consideration in Architectural Design
The nature of earthquakes must be understood before discussing earthquake considerations in architectural design. When the Earth’s crust suddenly releases energy, seismic waves that travel through the ground cause earthquakes
[21]. Large portions of the Earth’s crust, called tectonic plates, move when they collide, which releases energy
[22]. An earthquake’s hypocenter, or focus, is where it first forms within the planet’s crust. The epicenter is the location on Earth’s surface immediately above the hypocenter. Seismic waves, the energy’s primary mode of radiation outward from the epicenter, can move the ground and create shaking
[23].
Two basic categories into which these seismic waves fall are primary (P-waves) and secondary (S-waves). The first is the quickest seismic wave that can pass through solids, liquids, and gases. The direction of wave propagation is pulled back and forth by them. At the same time, the latter can only move through solids and are slower than P-waves. They produce a motion perpendicular to the wave propagation’s direction—either up and down or side to side
[24].
The Richter and moment magnitude scales are the two most prevalent measures used to determine how severe an earthquake is (Mw)
[25]. These scales provide a number representing the earthquake’s magnitude and quantify the energy released during an earthquake. Greater energy is released with higher magnitudes, which can cause damage and stronger ground shaking
[26]. It is also crucial to consider the frequency and length of the seismic waves during an earthquake. While “frequency content” refers to the range of frequencies in the seismic waves, the term “duration” relates to how long the ground shakes
[27]. The structural reaction and possible harm to structures and infrastructure are affected by both elements.
2.1. Earthquakes and the Built Environment
Earthquakes are the built environment’s worst enemy. The waves they spread destroy buildings, bridges, and other manmade structures. There are many ways that earthquakes can affect the built environment, including ground shaking, surface rupture, soil liquefaction, and landslides
[28]. Ground shaking is an earthquake’s main effect. The size of the earthquake, the distance from the epicenter, and the state of the local soil all impact the amount and length of the shaking. Building damage from ground tremors is possible, especially if the structure cannot withstand seismic forces
[29]. Occasionally, earthquakes can lead to a rupture of the earth’s surface along the fault line. This can be seen as a visible displacement of the Earth’s surface called surface rupture. Surface rupture can seriously harm nearby structures and infrastructure by directly impacting them
[30]. Seismic waves may result in a condition known as soil liquefaction in regions with loose, saturated soils. The ground undergoes a temporary weakening, exhibiting characteristics resembling a liquid during a phenomenon known as liquefaction. As a result, structures built on liquefiable soils may experience settlement, tilting, or even collapse.
[31]. Earthquakes have the potential to induce landslides on slopes and hillsides, especially in areas characterized by unstable soil or steep terrain. The occurrence of landslides can exacerbate the impact of an earthquake by potentially burying structures and obstructing transportation routes
[32].
Architects and engineers need to comprehend earthquake features and potential effects to build structures that can withstand these pressures. Considering these variables, architectural designs can be optimized for human safety and structural resilience in earthquake-prone areas.
2.2. Design Codes and Regulations
Buildings must be constructed to endure the seismic forces generated by earthquakes, and design guidelines and regulations are essential to this process. To design structurally secure and resilient buildings, architects and engineers must adhere to the standards and norms outlined in these rules, known as building codes. They are frequently based on in-depth analysis, historical information, and the lessons discovered from previous seismic disasters. By adopting particular design criteria and performance goals, they seek to reduce the dangers posed by earthquakes.
Numerous building codes emphasize earthquakes, and the widely accepted International Building Codes (IBCs) provide a foundation for seismic design and construction methods. Moreover, international organizations like the International Code Council (ICC) produce these codes, considering several variables like the area’s seismicity, the soil’s characteristics, and anticipated ground motion
[33]. IBCs often include a variety of topics, such as foundation design, building materials, and structural design
[34]. They ensure that earthquake design procedures are uniform and consistent around the world.
In addition, local authorities frequently create their building codes and regulations tailored to their local seismic conditions and international codes. These local codes may complement or amend the provisions of international standards to address regional geological traits, geotechnical issues, and construction techniques. To address the unique needs and guarantee legal compliance, architects must be aware of regional laws and modify their designs accordingly. Municipal rules could also include guidelines for seismic retrofitting of already-built structures, essential for improving the earthquake resilience of older structures not initially built to withstand seismic pressures. In order to lessen the consequences of earthquakes, retrofitting steps can be implemented, such as reinforcing structural components, enhancing connections, and adding dampening devices
[35].
2.3. Structural Systems for Earthquake Resistance
In the context of the impact of seismic events on building, the subject of the structure is at the forefront. Buildings need to have strong structural systems in place to withstand earthquakes. Using the proper structural systems, architects can improve a building’s capacity to withstand seismic forces and reduce damage. Several building structures are designed to support buildings and withstand earthquakes, including Reinforced Concrete Structures, Steel Structures, Timber Structures, and Hybrid Systems. Here are some brief explanations of them:
2.3.1. Reinforced Concrete Structures
Because of their durability and strength, reinforced concrete structures are frequently used in earthquake-prone areas. Steel reinforcement’s tensile strength is combined with concrete’s compressive strength to create reinforced concrete
[36]. Reinforced concrete is suited for withstanding the dynamic stresses produced by earthquakes because of its flexibility and energy absorption capacity. Key factors which enable load transfer and minimize brittle failure are suitable column and beam diameters, proper detailing of reinforcement, and efficient connections. Reinforced concrete structures provide a solid base for implementing appropriate seismic design measures. Buildings and infrastructure can be created to withstand earthquakes and guarantee the safety of people by integrating the material’s inherent strength and ductility with suitable engineering techniques
[37].
2.3.2. Steel Structures
Steel buildings are very strong and can survive considerable earthquake deformations. The outstanding strength-to-weight ratio of steel enables effective structural designs. Beams and columns make up steel frames, which offer flexibility and capacity for releasing energy
[38]. Steel structural systems for seismic resistance are frequently utilized in moment-resisting and braced frames. In an attempt to provide flexibility and robustness, connection design, member sizing, and details must be carefully considered
[39][40][41][42][43].
2.3.3. Timber Structures
If timber structures are constructed and designed appropriately, they have the capacity to withstand seismic events. Timber has natural dampening qualities and is capable of absorbing earthquake energy. Cross-laminated timber (CLT) panels and glued laminated timber (glulam) beams are two examples of cutting-edge timber systems that provide great strength and stiffness
[44][45]. To maintain stability and integrity during earthquakes, timber structures must be constructed to resist lateral forces and have suitable connections and bracing mechanisms.
2.3.4. Hybrid Systems
Hybrid structural systems integrate materials such as concrete, steel, and timber to capitalize on each material’s advantages and improve performance during earthquakes. These systems can be designed in various ways, increasing seismic resistance while considering particular project requirements
[46]. In order to increase stiffness and energy absorption, a hybrid system can, for instance, use concrete shear walls, steel plate shear walls
[47], and steel frames for long spans.
Structural engineers and architects must work closely to choose the best structural system based on the project requirements, site conditions, and seismic considerations. An appropriate structural system guarantees the building’s safety, usability, and long-term resistance during seismic occurrences.
2.4. Architectural Considerations for Earthquake Resistance
Incorporating particular design factors that improve a building’s earthquake resistance is a crucial task for architects. Architectural choices greatly impact a structure’s overall performance and safety during an earthquake, even though structural systems are the main means of resisting seismic forces. Key architectural factors for earthquake resilience include the following:
2.4.1. Building Configuration and Layout
A building’s layout and configuration can influence its response to seismic forces. Regular building forms, such as square or rectangular floor plans, perform better during earthquakes than complicated or irregular geometries. Regular geometries better distribute forces equally, lessening concentrated, localized stress
[48]. To maximize structural performance and reduce earthquake susceptibility, architects should work to design straightforward, symmetrical building designs. Moreover, large open areas, such as atriums or large halls, can be difficult to design for earthquakes because they alter how forces pass through a structure. Strong floors and efficient support systems are essential to maintaining the building’s structural integrity
[49]. Moreover, a building can avoid severe swaying during an earthquake by properly distributing mass vertically. The risk of an overturning structure is decreased by placing heavier components lower in the structure
[50].
2.4.2. Reducing Mass and Stiffness Irregularities
Changes in mass and rigidity can have adverse structural effects during earthquakes. Uneven distribution of mass and stiffness can result in uneven force distribution and torsional effects, leading to structural instability
[51]. Through meticulous balancing floor plans, considering the even distribution of structural elements, and avoiding abrupt changes in stiffness or mass in the building, architects can reduce irregularities in mass and stiffness. Special consideration must be given to buildings with irregular elevation, mass, or stiffness to adequately manage seismic forces. Setbacks and soft story arrangements are two irregularities required for proper design
[52].
2.4.3. Openings, Facades, and Cladding
With the previous in mind, architects must therefore consider enhancing the resistance of these components towards earthquake forces. Giving openings and facades the proper detailing, reinforcement, and anchoring is essential
[53]. When combined with the proper joints and connections, flexible materials, such as curtain walls, can accommodate structural movement while preventing cladding separation during seismic events.
2.4.4. Rooftop Structures
Rooftop constructions, including mechanical equipment, rooftop gardens, and water tanks, should be suitably engineered and secured to withstand seismic stresses
[54]. These buildings should have strong connections and enough anchorage to avoid collapsing or dislodging during earthquakes. Research has been expanded for more seismic design solutions because rooftop structures are a subset of a larger typology known as multi-story structures. Seismic isolation is a successful technique in these circumstances. Using flexible isolators at a building’s foundation, seismic isolation is a novel passive method that increases earthquake safety by relocating the fundamental period of the structure away from potentially harmful resonance frequencies
[55]. According to studies, using this technique to retrofit existing buildings can reduce the danger of earthquakes. With the aid of a specially developed optimization procedure, Charmpis, Phocas and Komodromos
[55] could identify configurations of isolators distributed vertically throughout the height of a building that produce favorable structural behavior. This procedure can automatically and effectively explore the enormous set of potential retrofit solutions formed by all conceivable isolator number, location, and property combinations.
Another method is to attach the device’s mass to the main structure using High-Damping Rubber Bearings (HDRB). This technique produces an unconventional Tuned Mass Damper (TMD) with a significant mass ratio by fusing stiffness and damping qualities. This method avoids excessive weight increases while maintaining structural or architectural functioning by converting existing masses into tuned masses
[56].
Making decisions for new buildings or retrofitting is rationalized by seismic fragility, loss, and resilience. A relatively new seismic vibration control solution for higher buildings is inter-storey isolation (ISI). The isolation bearings are positioned at an intermediate level to isolate the upper storey block (USB), which also functions as a non-traditional tuned mass damper (TMD) to the lower storey block (LSB), reducing vibration
[57]. The fundamental benefit of inter-story seismic isolation is the blockage of energy flow between the upper and lower stories, making it an effective way to divide the various components of high-rise buildings with distinct uses and, consequently, variable seismic performance needs
[58].
In their seismic design, tall structures that use multi-story isolation, often called multi-story base isolation, are more resilient to earthquakes. Using this method, a tall building’s various levels are equipped with a set of seismic isolation mechanisms that enable individual floors or groups of floors to act freely of one another during an earthquake. The goal is to lessen the building’s ability to transmit seismic forces, protecting residents and minimizing structural failure
[59]. The traditional seismic design method concentrates on creating a whole structure that can withstand the forces produced by an earthquake. However, the structure may experience severe pressures and deformations as a result. An alternate tactic is multi-story isolation, which effectively separates the upper floors from the lower ones in terms of seismic vibration by permitting controlled movement at different levels
[60]. During seismic occurrences, precautions must be taken to prevent rooftop components from becoming hazardous by falling and potentially damaging the primary structure or neighboring buildings.
2.4.5. Escape Routes and Safe Areas
Designing secure locations and clear, accessible escape routes should be a top priority for architects. These locations should be placed wisely to offer residents safe zones during an earthquake
[61]. In order to function both during and after seismic disasters, stairwells, elevators, and emergency exits need to be appropriately designed
[62]. Safe spaces should be structurally strong and free of potential risks, such as flying debris or broken building parts.
2.5. Other Considerations
2.5.1. Advanced Structural Analysis and Simulation
Finite element analysis, computational modeling, and simulation software developments have completely changed how structures are assessed for seismic performance
[63]. With the aid of these tools, engineers and architects can examine how buildings will respond to various earthquake scenarios, assess structural responses, and improve designs for greater resilience. Advanced analysis methods, including nonlinear dynamic analysis, make it possible to forecast structural behavior more precisely, including identifying crucial failure modes and potential weak spots
[64][65].
Engineers can develop and test damping systems, base isolators, and other methods to lessen seismic forces’ effects through simulation and analysis. These devices can improve a structure’s seismic performance by reducing vibration transfer to the structure
[66].
Another technique is Response Spectrum Analysis, which describes how the structure reacts to various ground motion intensities. Response spectra show the structure’s highest response at various frequencies. By simulating these reactions, engineers can better predict how different structure components will respond to an earthquake
[67][68].
2.5.2. Interdisciplinary Collaboration
Close cooperation between architects, structural engineers, and other relevant specialists is necessary to address these architectural issues. Architects and structural engineers should collaborate to ensure that architectural design choices adhere to the structural criteria for earthquake resilience. Architects can help develop safer, more durable structures that can better withstand the forces generated by earthquakes by including these factors in their designs.
Effective earthquake-resistant architecture design requires interdisciplinary cooperation between structural engineers and architects. Structural engineers offer specific knowledge in structural analysis, load distribution, and material qualities, while architects contribute their skills in spatial design, aesthetics, and functional requirements. Architects and engineers can create integrated design solutions that balance architectural objectives with structural integrity and seismic resistance by collaborating early on in a project. Close coordination between the structural and architectural teams ensures the building’s design maximizes earthquake resilience and aesthetic appeal.
Translating design intent into reality requires effective cooperation between structural engineers, contractors, and construction teams. During the design phase, architects should consult with construction experts to address constructability issues, pinpoint prospective difficulties, and investigate cutting-edge construction methods. Regular coordination and communication throughout the building process ensure that seismic design requirements are met, and the design objective is realized.
A successful earthquake-resistant architectural design depends on including stakeholders like building owners, occupants, and governmental authorities. In an attempt to comprehend stakeholders’ individual requirements and expectations, architects should promote open communication. Building owners should be included in talks about design decisions, retrofitting possibilities, and long-term maintenance plans to help ensure that the structure fits their needs while following seismic design guidelines
[69]. Incorporating considerations for the safety and resilience of the broader community collaboration with public authorities and regulatory agencies ensures compliance with local norms and regulations.
Interdisciplinary cooperation encourages a comprehensive strategy for designing earthquake-resistant buildings. The expertise of architects, structural engineers, geotechnical specialists, construction experts, and stakeholders is combined to thoroughly grasp the project’s requirements and limitations. A safer and more resilient built environment results from this collaborative effort, yielding integrated design solutions prioritizing architectural excellence and the capacity to withstand seismic impacts.
2.5.3. Technological Innovations
Technological breakthroughs have considerably improved the design of earthquake-resistant buildings. New tools, techniques, and materials made possible by innovative technologies increase structural resilience, allow for more precise assessments, and boost monitoring capabilities. The following technological advancements in earthquake-resistant architecture design deserve special mention:
Additional precautions, including base isolation and damping devices, are taken to increase buildings’ seismic resilience. Base isolation entails putting the structure atop seismic energy-absorbing bearings or isolators. Separating the structure from ground motion lessens the forces imparted to the superstructure. Viscosity dampers and tuned mass dampers are two types of damping devices used to disperse seismic energy and lessen structural vibrations. These devices can be added to different structural systems to lessen the impact of earthquakes.
Earlier attempts by Kelly
[70] to use natural rubber as a measure of protection date back to 1976. He realized that the best way to employ these energy devices to defend structures from earthquakes would be to pair them with an isolation system (he used hand-made isolators), providing them with the significant displacements needed to produce the necessary hysteresis. Another attempt to lessen the seismic vulnerability of civil structures and infrastructures is geotechnical seismic isolation (GSI). GSI is regarded as a novel technique. The application of rubber–soil mixtures to the acceleration and inter-story drift of low to medium-rise buildings
[71]. In the study by Tsang et al.
[72], an equivalent liner model was used to simulate both the GSI’s and the soil’s dynamic reaction. A study by Darlington and Becker
[73] looked at how nonzero rotation boundary conditions affect design fundamentals like horizontal and rotational stiffness and found that flexible boundary conditions reduce horizontal stiffness, which depends on the total rotation at the ends and axial load, with larger loads requiring more rotation. The soil’s dynamic response was assessed using the secant shear modulus and the damping ratio. A flexible multi-story building isolated with a variable friction pendulum system (VFPS) under near-fault ground vibrations has a dynamic reaction that can be used as another technique to withstand earthquake hazards. The VFPS efficiently regulates seismic response, but underestimating bi-directional frictional forces can lead to overestimating superstructure accelerations and isolator displacements.
Infrastructure system developments concentrate on creating tools that improve the built environment’s overall resilience. This includes incorporating distributed energy storage systems, microgrids, and smart grid technologies
[74][75]. These technologies guarantee the availability of essential services, such as power supply, communication networks, and emergency response systems, both during and after earthquakes
[76]. Buildings can more effectively survive seismic disasters and aid post-earthquake recovery efforts by including resilient infrastructure systems in their architectural design.
Architects should keep up with new technological developments and how they might be used to create earthquake-resistant structures. Then, they may improve buildings’ effectiveness, security, and resilience by using technological advancements, helping to create sustainable and earthquake-resistant environments.