The Evaluation and Retrofit of a Historic Unreinforced Masonry Building Using Nonlinear Adaptive Pushover And Dynamic Analysis Methods

Abstract eng:
Various nonlinear analysis techniques were used to analyze a historic unreinforced masonry landmark structure in San Francisco in its original and seismically retrofitted condition. The structure is a monumental 100-year old synagogue that survived the 1906 San Francisco Earthquake. Although the building escaped the Great 1906 earthquake with relatively little damage, the building was recently threatened with closure due to non-compliance with an Unreinforced Masonry Building Ordinance. The most appropriate structural solution consistent with preserving the historic fabric takes advantage of the dynamic separation between the modes predominated by in-plane and out-of-plane wall shaking. The solution consisted of a combination of intervention techniques, each developed to minimize disturbance to the nonstructural historic finishes and retain the original dynamic characteristics. The structure was subjected to linear and nonlinear static and dynamic analyses to benchmark its behavior during the 1906 earthquake. Adaptive pushover analyses were also performed using the first natural mode of vibration of each wall. To validate the full three-dimensional response of the building and to develop design forces for the new structural elements that were added to strengthen the system, a three-dimensional model was constructed in SAP2000 and subjected to static and dynamic analyses.

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