An evacuation plan should also be developed. Local and state building officials can identify regulatory requirements, alternative approaches to meeting these requirements, and a historic preservation or building conservation code if one has been adopted by the jurisdiction. Too much drift often results in extensive damage to exterior and interior walls and nonstructural components.The addition of steel moment frames, braced frames of various configurations, and concrete shear walls are typical methods for increasing the strength and stiffness of a building. This begins by gathering any available information about the buildingâs original construction.
This may be accomplished by adding columns or shear walls in order to adequately transfer lateral loads to the ground.Preventing the collapse of the walls, particularly load-bearing walls, is critical in URM buildings. In the case of multi-story apartment buildings with a soft or weak story, additional steel frames or masonry shear walls may be necessary to give adequate strength to the ground floor (see FEMA P-807).Seismic isolation and energy dissipation systems are relatively new, highly sophisticated methods that require extensive design and engineering analysis. Utilitarian structures, such as warehouses, may be able to receive fairly visible reinforcement systems without undue damage to their historic character (Figures 17-18).
A glossary of technical terms is also provided at the end of the Brief.Undertaking the seismic rehabilitation of a historic building is a process that requires careful planning and execution, and the coordinated work of architects, engineers, code officials, contractors, and agency administrators. While many jurisdictions have adopted prescriptive standards, primarily for certain building types such as unreinforced masonry load bearing walls, more sophisticated, performance-based evaluation methods allowed by some codes offer more flexibility.
This guide is not intended to prescribe how seismic retrofit should be done, but rather, to illustrate that every physical change to a building will have some consequence. Remediating Seismic Deficiencies 8. Thus, having a recovery plan already in place is highly recommended.Having an established emergency plan, complete with access to plywood, tarpaulins, bracing timbers, and equipment, will allow quick action to save a building following an earthquake. Other, more architecturally detailed buildings or those with more finished or decorative interior surfaces will benefit from more hidden systems. The photographs used in this publication may not be used to illustrate other publications without permission of the owners.Agbabian, M.F. In the case of an incremental rehabilitation, the scope and sequence of each phase must also be clearly detailed. Compiling any available documentation that quantifies their proven seismic resistance or describes seismic reinforcement work or any other changes that have occurred over time is extremely useful. Thus, it is critical to consider the risk and consequences of potential nonstructural failures.
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