Design of Nonlinear Viscous Dampers for Elastic Buildings Subjected to Near-Fault Ground Motion
Date Issued
2014
Date
2014
Author(s)
Tseng, Hui-Yu
Abstract
ASCE7-10 provides a reduction factor B for engineers to determine the seismic demands of buildings equipped with energy dissipation systems, such as viscous dampers. However, ASCE7-10 does not suggest the use of the factor B on buildings located at soft soil sites and those subjected to ground motions with near-fault characteristics. For buildings subjected to near-fault ground shaking, reduction factors for spectral acceleration ( ) and displacement ( ) are developed in this study to improve the accuracy of the design procedures of ASCE 7-10.
In this study, a series of nonlinear response-history analyses (RHA) are conducted for sample 5-, 15- and 34-story buildings equipped with nonlinear viscous dampers. The results of RHA are used to benchmark those computed using the two design procedures provided in ASCE 7-10, namely, Response Spectrum Procedure (RSA) and Equivalent Lateral Force Procedure (ELF). The pros and cons of RSA, ELF, and the B values provided in ASCE 7-10 are discussed. A new method is proposed in this study using multiple single degree-of-freedom linear RHA to capture the responses of buildings with nonlinear viscous dampers and subjected to near-fault ground motions. The new method provides more accurate results than the RSA and ELF of ASCE 7-10, especially in the prediction of peak floor acceleration.
Subjects
非線性阻尼器
近斷層地震
等效線性
Type
thesis
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