ATC-72 of the PEER Tall Buildings Initiative: Interim Guidelines on Modeling and Acceptance Criteria for Seismic Design and Analysis of Tall Buildings

摘要

The City of Los Angeles, the City and County of San Francisco, and other communities on the West Coast are undergoing a boom in the construction of high-rise buildings that involve a variety of unusual configurations, innovative structural systems, and high performance materials. Various jurisdictions, with the active involvement of peer review committees, are considering performance-based methods to assess the adequacy of these new designs. These parallel efforts create a timely opportunity for collaboration to improve and increase the application of performance-based designs for tall buildings, thereby assuring that new high-rise construction meets intended safety and performance objectives, ensuring safe and usable buildings after future major earthquakes. The Pacific Earthquake Engineering Research Center (PEER) is presently undertaking a multi-year program to develop guidelines to aid the engineering community with the design, analysis and construction of these tall buildings.rnThe ATC 72 project has been funded by PEER as part of this larger program to develop practical guidance for acceptance criteria and for nonlinear modeling of tall buildings in reinforced concrete and structural steel. Recommendations for selected topics such as stiffness, strength, deformation capacity, hysteretic models, and implementation in software for nonlinear response-history (NLRH) analysis are being developed as part of this effort. Guidance on appropriate parameters to be applied to the use of capacity design, including determining overstrength demands from NLRH analysis and capacity-reduction factors that provide an appropriate overall level of reliability are being addressed.rnOther issues that affect earthquake response and design, including modeling of podium force transfer are also included. Acceptance criteria address aspects of reliability of safety, capital preservation, re-occupancy, and functionality. Uncertainty assessment is an essential part of this task. The document is presently being finalized and will be completed during 2008. The document is intended to serve as a primary resource for the remaining tasks of the PEER Tall Buildings Initiative that will develop guidelines for the seismic design of tall buildings. In addition to the PEER Guidelines Writing Team, designers of tall buildings, peer reviewers and local jurisdictions will all greatly benefit from the contents of this document.