论文部分内容阅读
为了研究钢管混凝土桥墩的抗震性能并评估桥墩在地震作用下的累积损伤,对比分析了不同累积损伤模型的差异性,提出了一种基于损伤指标的钢管混凝土桥墩地震累积损伤评估方法。基于纤维截面模型,对某钢管混凝土桥墩在不同地震动强度下进行了横桥向动力时程分析,并从概率角度对桥墩的累积损伤进行评估。结果表明:对于抗震设防烈度为7度的桥墩,在相当于7度E1地震作用下处于基本完好状态,在相当于7度E2地震作用下没有发生严重破坏或失效破坏,在两种超罕遇地震作用下的失效概率分别为15.7%和27.14%,满足抗震设防要求。研究结果可为实际工程中钢管混凝土桥墩的抗震性能评估提供参考。
In order to study the seismic behavior of concrete filled steel tubular piers and to evaluate the cumulative damage of piers under earthquake, a comparative analysis of the differences of different cumulative damage models is presented. An evaluation method for seismic cumulative damage of concrete filled steel tubular piers based on damage indices is proposed. Based on the fiber cross-section model, a transverse CFD analysis of a CFST pier under different ground motions was carried out. The cumulative damage of the pier was evaluated from the perspective of probability. The results show that for the pier with seismic fortification intensity of 7 degrees, it is basically intact under the equivalent of 7 degree E1 earthquake and no serious damage or failure damage occurs under the equivalent of 7 degree E2 earthquakes. The probability of failure under earthquake action is 15.7% and 27.14%, respectively, which meets the seismic fortification requirements. The results can provide references for the seismic performance evaluation of CFST pier in practical engineering.