A threat/vulnerability assessment and risk analysis can be used to define the level of performance desired for the building project. In order to characterize or measure the effect of an earthquake on the ground (a.k.a. First, the design team must take a multi-hazard approach towards design that accounts for the potential impacts of seismic … Designing a building is a complex and specialist undertaking that is well beyond the scope of this guidance, but a few of the basic concepts are briefly introduced here. Basically, the Earth's crust consists of a series of "plates" floating over the interior, continually moving (at 2 to 130 millimeters per year), spreading from the center, sinking at the edges, and being regenerated. 1090 Vermont Avenue, NW, Suite 700 | Washington, DC 20005-4950 | (202) 289-7800 Innovative Solutions for the Built Environment The building must be designed to act as a unit, or "rigid box", of appropriate height (to avoid overturning) and have flexible utility connections to accommodate movement at its base. Earthquakes are the shaking, rolling, or sudden shock of the earth's surface. In addition, as a general rule, buildings designed to resist earthquakes should also resist blast (terrorism) or wind, suffering less damage. Blast Protection. The Seismic Design Principles, Using 2018 IBC (2019 CBC, AISC 7-16) version book includes lecture notes, multiple-choice questions with detailed solutions to prepare and pass the California Seismic Exam. Is there a potential for landslide or liquefaction on or near the site? Base Isolation: This seismic design strategy involves separating the building from the foundation and acts to absorb shock. Energy will dissipate if ductile materials deform in a controlled way. Wood or timber frame (good energy absorption, light weight, framing connections are critical). Base Isolation retrofit is a costly operation that is most commonly appropriate in high asset value facilities and may require partial or the full removal of building occupants during installation. Usually, the longer the duration, the less acceleration the building can endure. WBDG is a gateway to up-to-date information on integrated 'whole building' design techniques and technologies. The momentum of the earthquake will push over top-heavy buildings with significant force. Frictive Isolators are also used and are made primarily of metal parts. For over 29 years, the SDR seminars and SDR workbook have been helping candidates prepare for the California Civil P.E. Ductility: Ductility is the characteristic of a material (such as steel) to bend, flex, or move, but fails only after considerable deformation has occurred. Saada Hotel (before)—Agadir, Morocco, 1960, Saada Hotel (after) ground shaking damage—Agadir, Morocco, 1960. The column/beam joints are carefully designed to be stiff yet to allow some deformation for energy dissipation taking advantage of the ductility of steel (reinforced concrete can be designed as a Moment-Resistant Frame as well). For example, were the Oklahoma Federal Building designed to seismic design standards, the damage caused by the blast would have been much less (refer to MAT Report FEMA 277). Additional space (a "moat") must be provided for horizontal displacement (the whole building will move back and forth a whole foot or more). Stiffness of a material is a degree of resistance to deflection or drift (drift being a horizontal story-to-story relative displacement). Energy-Dissipating Devices are used to minimize shaking. Avoid a soft-story design, such as a parking garage on ground level. Like shear walls, Braced Frames are designed to take lateral loads but are used where shear walls are impractical. Special considerations for suspended ceilings. Reinforced masonry walls (good energy absorption if walls and floors are well integrated; proportion of spandrels and piers are critical to avoid cracking), Reinforced concrete walls (good energy absorption if walls and floors well integrated; proportion of spandrels and piers are critical to avoid cracking), Steel frame with masonry fill-in walls (good energy absorption if bay sizes are small and building plan is uniform), Steel frame, braced (extensive bracing, detailing, and proportions are important), Steel frame, moment-resisting (good energy absorption, connections are critical), Steel frame, eccentrically braced (excellent energy absorption, connections are critical), Pre-cast concrete frame (poor performer without special energy absorbing connections). The basic objectives of seismic design for nonstructural components are to provide life safety, minimize property loss and prevent functional loss. The soil also has a period varying between 0.4 and 1.5 sec., very soft soil being 2.0 sec. Torsion: Objects and buildings have a center of mass, a point by which the object (building) can be balanced without rotation occurring. For definitions of terms used in this resource page, see Glossary of Seismic Terminology . For more information, see WBDG Designing Buildings to Resist Explosive Threats section on Seismic vs. Seismic Terminology (For definitions of terms used in this resource page, see Glossary of Seismic Terminology ). This resource page provides an introduction to the concepts and principles of seismic design, including strategies for designing earthquake-resistant buildings to ensure the health, safety, and security of building occupants and assets. ground motion), the following definitions are commonly used: If the level of acceleration is combined with duration, the power of destruction is defined. 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