MODIFED SEISMIC RESPONSE COEFFICIENT (CS) FOR DESIGNING SUPER HIGH-RISE BUILDINGS USING PERFORMANCE-BASED DESIGN METHOD
Keywords:
Modified Seismic Response Coefficient (CS-M), Performance-Based Design (PBD), Risk-Targeted Maximum Considered Earthquake (MCER), Service-Level Earthquake (SLE), Tall Building Initiative (TBI)Abstract
Performance-Based Design (PBD) method is widely used to design or evaluate super high-rise building against earthquake loads. The building is expected to present a certain level of performance set on FEMA 303 in response to ground motions, and should meet the target performance at Service Level Earthquake (SLE) and at Risk-Targeted Maximum Considered Earthquake (MCER). The performance level would be determined by using non-linear time history analysis and it requires non-linier parameter based on reinforcement of the structural elements. The common method proposed by Tall Building Initiative (TBI) requires the structural members are designed using response spectra at Service Level Earthquake (SLE). The problem is the ground motion and response spectra at Service Level Earthquake (SLE) are not always immediately available.
In this paper, the modified seismic response coefficient (CS-M) is introduced in designing the structural members, as an initial step of Performance-Based Design (PBD), using the common response spectra of Risk-Targeted Maximum Considered Earthquake (MCER) instead of Service Level Earthquake (SLE). The performance of buildings is evaluated at Service Level Earthquake (SLE) and Risk-Targeted Maximum Considered Earthquake (MCER) to validate that design with modified seismic response coefficient (CS-M) is still in accordance with method by Tall Building Initiative (TBI).
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