Session: SE-01-01 Earthquake Resistance and Seismic Margin

Paper Number: 123232

123232 - Static Incremental Analysis With Modal Inertia Force Taking Into Account the Elastoplastic Nature to Estimate Elastoplastic Displacements of Structures 

Estimating the maximum elastoplastic response of structures during earthquakes is primary interest to designers. To date, only the time history analysis can calculate elastoplastic responses of structures. However, such responses are considered lack generality, because they do not represent responses of the structure that the structure will experience during its lifetime. Contrary, the design response spectrum is generated to provide a normative response of linear structures by taking into account the response characteristics to many earthquakes. Therefore, if we can calculate elastoplastic responses of structures based on the design response spectrum, structural healthiness during the severe earthquake can be verified. Such a motivation in mind, this paper develops a static incremental analysis to estimate elastoplastic displacements of structures. Its essence is that; 1) use modal properties according to the spring state and define the modal inertia forces with/without intercept of the restoring force from the absolute acceleration spectrum value, 2) define the intensity of base excitation after yielding so as to make the absolute acceleration in the global coordinates system continue and 3) calculate the maximum elastoplastic displacement of each floor by the modal combination rule. The displacement calculated form the proposed procedure is compared with that computed. Accuracy of the proposed procedure is clarified.

Presenting Author: Tomoyo Taniguchi Tottori University

Presenting Author Biography: He finished the master’s course of the graduate school of the University of Tokyo in 1989. After experiencing design of steel structures in Kawasaki Heavy Industries, Ltd. for 13 years, he joined the faculty member of Tottori University in 2001. His research interests in the PVPD related area are analysis of the tank rocking motion, its design method and approximation of elasto-plastic displacement of piping. He served as the chair of the seismic engineering technical committee from 2013 to 2017 and the chair of the fluid-structure interaction technical committee from 2017 to 2021.

Authors:

Tomoyo Taniguchi Tottori University
Takumi Kaieda Tottori University