CAJ | 학술논문

在利用结构地震易损性分析方法进行结构的抗震性能评估时,采用的地震波数量对于计算精度具有重要的影响. 为此以9层钢筋混凝土框架结构为研究对象, 选取50条地震波对其地震易损性进行分析,将最大层间位移角和最大顶点位移角作为结构地震需求参数,以地震加速度峰值PGA作为地震输入参数, 得到不同地震动样本条件下的地震易损性曲线.通过比较采用50条、40条和30条地震动样本时求得的易损性曲线,可知三者计算结果的拟合程度较好,但随地震动样本数量的减少曲线逐渐出现发散. 算例表明对于钢筋混凝土框架结构, 选取30条地震动样本作为易损性分析的地震输入,可以满足结构的计算精度和抗震性能评估的要求,基于地震易损性分析可以合理预测地震作用下结构的破坏概率,评估结构的抗震性能.
재이용결구지진역손성분석방법진행결구적항진성능평고시,채용적지진파수량대우계산정도구유중요적영향. 위차이9층강근혼응토광가결구위연구대상, 선취50조지진파대기지진역손성진행분석,장최대층간위이각화최대정점위이각작위결구지진수구삼수,이지진가속도봉치PGA작위지진수입삼수, 득도불동지진동양본조건하적지진역손성곡선.통과비교채용50조、40조화30조지진동양본시구득적역손성곡선,가지삼자계산결과적의합정도교호,단수지진동양본수량적감소곡선축점출현발산. 산례표명대우강근혼응토광가결구, 선취30조지진동양본작위역손성분석적지진수입,가이만족결구적계산정도화항진성능평고적요구,기우지진역손성분석가이합리예측지진작용하결구적파배개솔,평고결구적항진성능.
In the analysis of structure seismic fragility, the number of seismic waves chosen has a great influence on calculation accuracy. Therefore, this study uses 50 seismic waves to analyze the seismic fragility of a nine-story reinforced concrete frame structure, which is the object of this study. With the maximum top-drift-angle and the maximum story-drift-angle acting as the structure seismic demand parameter, and PGA as the seismic input parameter, the seismic fragility curves of different ground motion samples are then gained. By comparing the fragility curves gained when using respectively 50, 40, and 30 seismic waves, it is found that the fitting degree shown through calculation is satisfying. However, divergence of the curves gradually occurs as the ground motion sample decreases in number. The sample study indicates that as for reinforced concrete frame structure, choosing 30 ground motion samples as the seismic input of fragility analysis can meet the requirements of calculation accuracy and that of structure seismic performance evaluation, and the seismic fragility analysis can reasonably predict the failure probability of the structure under earthquake based on seismic evaluation of structural performance.