斜拉桥桥塔非线性抗震性能研究

发布时间：2018-05-09 03:06

本文选题：桥梁工程 + 桥塔　；参考：《中国公路学报》2016年03期

【摘要】：为了有效地指导斜拉桥的抗震设计,探讨了桥塔的非线性抗震性能。通过在拉索中施加初始应变模拟斜拉桥在自重下的成桥状态内力及线形,给出了拉索初始应变的计算方法;用纤维截面梁柱单元模拟桥塔,基于OpenSees平台建立了中等跨度斜拉桥的动力分析基准模型,并与Sap2000模型进行了比较。通过5条强震记录下的增量动力分析(IDA),得到了斜拉桥的塔顶位移、塔底曲率及塔中关键截面的曲率IDA曲线及塑性单元的形成及扩展规律、桥塔的初始屈服位置及最终地震破坏位置。研究结果表明:桥塔屈服时惯性力沿塔身的分布比较复杂,塔顶位移作为抗震指标不能较好反映桥塔的地震损伤;桥塔屈服后仍有一定的抗震能力储备,按弹性抗震设计则比较保守。
[Abstract]:In order to effectively guide the seismic design of cable-stayed bridge, the nonlinear seismic performance of tower is discussed. By applying the initial strain in the cable to simulate the internal force and the linear shape of the cable-stayed bridge under dead weight, the calculation method of the initial strain of the cable is given, and the bridge tower is simulated with the Liang Zhu element of fiber section. The reference model for dynamic analysis of medium span cable-stayed bridge is established based on OpenSees platform and compared with Sap2000 model. Based on the incremental dynamic analysis of the cable-stayed bridge under five strong earthquake records, the displacement of the tower top, the curvature of the tower bottom, the curvature IDA curve of the key section of the tower and the formation and expansion of the plastic element are obtained. The initial yield position and the final seismic failure location of the bridge tower. The results show that the distribution of inertial force along the tower body is complex when the tower yielding, the top displacement of the tower can not reflect the seismic damage of the bridge tower as a seismic index, and there is still a certain seismic capacity reserve after the bridge tower yield. Elastic seismic design is more conservative.
【作者单位】：兰州交通大学土木工程学院;同济大学土木工程学院;
【基金】：国家重点基础研究发展计划(“九七三”计划)项目(2013CB036302) 国家自然科学基金项目(51368033)
【分类号】：U448.27;U442.55

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