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增量动力分析法(IDA)是对结构进行抗震评估的一种有效方法。采用挠跨比作为结构性能参数、地面峰值加速度作为地震动强度参数,选取10条地震波,以某实际大跨度空间管桁架结构为研究对象,对其进行增量动力分析。同时,从概率分析的角度,得出结构地震易损性曲线。结果表明:该结构在8度三水准地震作用下达到三种极限状态的概率较小;该结构在8度罕遇地震作用下倒塌概率仅为0.93%,承载能力较高,但延性较低;增量动力分析方法和地震易损性分析相结合可以有效地评估大跨度空间管桁架结构的抗震能力。
Incremental dynamic analysis (IDA) is an effective method for seismic evaluation of structures. Taking the flexspan ratio as the structural performance parameter and the ground peak acceleration as the parameters of ground motion strength, 10 seismic waves are selected. Taking an actual long-span space tube truss structure as the research object, the incremental dynamic analysis is carried out. At the same time, from the perspective of probability analysis, the structural vulnerability curve is obtained. The results show that the probability of the structure reaching the three limit states under the earthquake of 8 degrees and 3 levels is small. The probability of collapse of this structure is only 0.93% under the severe earthquake of 8 degrees, and the bearing capacity is higher but the ductility is lower. The combination of incremental dynamic analysis and seismic vulnerability analysis can effectively evaluate the seismic capacity of long-span space tube truss structures.