Application On Performance-based Seismic Evaluation Method Of Main Factroy Building

Power system，as an important part of lifeline systems, plays a pivotal role in thenational economy of which security issues directly affects the production andconstruction of the country. An important reason for the great loss caused by previousearthquakes is the server damage of lifeline engineering systems, affecting the smoothprogress of the relief work. Therefore, being properly informed of the future earthquakeresponse of such key preventive B buildings is very important, which has importanttheoretical significance and practical values. Performance-based seismic theory can be adetailed evaluation of the seismic performance and a comprehensive understanding ofthe seismic response. So the method will be applied to the research on seismicperformance of the thermal power plant main factory building and the main researchwork includes the following aspects:(1) Several methods based on performance seismic design were summarized.Displacement-based methods are the currently used methods, an overview of themethods are provided in the paper, especially being elaborated on the basic theory of thecapacity spectrum method, including the establishment of the capacity spectrum anddemand spectrum curve, the reduction of the demand spectrum curve, the relativeparameter conversion in ATC-40methods and spectrum in Chinese Standard, as well asthe determination of the performance point.(2) With Finite element analysis software SAP2000, the modal analysis,earthquake response spectrum analysis subjected to unidirectional and bidirectionalearthquakes respectively and pushover analysis of a large thermal power plant mainfactory building were accomplished, focusing on the differences in structural seismicresponse brought by two ways of loading: mode loading and acceleration, and the influences on pushover results of structures exerted by X and Y directions, both positiveand negative loading directions.(3) The level of performance and its quantitative indicators for different structuralforms of thermal power plant main factory buildings were quantified, and theperformance of the SRC structural system with fewer walls was evaluated underfrequent earthquakes, precautionary earthquakes, rare earthquakes and great earthquakes,the finite element analysis results together with the test results were compared to verifythe accuracy of pushover analysis method.(4) The damage assessment method was simplified on the basis of capacityspectrum method and the damage index and performance goals were both given. Thedamage assessment of the SRC structural system with fewer walls was conducted underprecautionary earthquakes, rare earthquakes and great earthquakes, and the damagedifferences exerted by two ways loading and opposite directions were compared andanalysied.The research results show that the method on performance-based seismicassessment of the the power plant structural system is simple and practical, easy tooperate and produces reliable analysis results. The displacement response of modeloading is greater than acceleration loading, and damage of negative loading directionsis more severe than positive loading directions. The research results also show that theseismic performance of thermal power plant main factory building can meet therequirement of3-level seismic design target and also can meet the performanceobjectives proposed in this paper.