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Design and construction of tall mass timber buildings with resilient post-tensioned mass timber rocking walls
Busch, Aleesha
Busch, Aleesha
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2023
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Abstract
With current trends in urbanization and population rise, there is a surging need for high-rise structures that can offset the environmental impacts of today's construction industry. Mass timber, especially in the form of gravity systems, has been an appealing alternative to building with other nonrenewable materials for the past couple of decades. Mass timber lateral systems, particularly in the form of post-tensioned mass timber rocking walls, have been proven to be a resilient system that performs well under seismic loading with sufficient strength and stiffness. However, the use of post-tensioned mass timber rocking walls as a lateral force-resisting system has been limited by current U.S. standards and requires extensive tests and analyses that aren't typical of standard structural design offices.
The development of design provisions for post-tensioned mass timber rocking walls aims to take the first steps in getting these lateral systems recognized in standard U.S. codes such that buildings with these systems can be designed, permitted, and constructed. These provisions provide the requirements of a post-tensioned mass timber rocking wall system, as well as the necessary checks needed at the component and system level. The provisions are accompanied by three design examples that follow the design provisions and aim to assist practicing engineers with the steps and calculations needed to complete the design of these systems. The design examples utilize realistic building floor plans that would feature post-tensioned mass timber rocking walls as their lateral force-resisting system in seismically active regions.
To further evaluate the feasibility and constructability of high-rise mass timber buildings with post-tensioned rocking walls, a full-scale 10-story building composed entirely out of mass timber will be designed and constructed on the world's largest 6-DOF outdoor shake table at the NHERI@UCSD facility in San Diego, California.
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