钢管混凝土组合桁梁-格构墩轻型桥梁非线性地震响应分析

发布时间：2018-06-28 13:10

本文选题：桥梁工程 + 钢管混凝土组合桁式梁　；参考：《工程力学》2015年12期

【摘要】：以干海子大桥第二联为原型,建立基于纤维单元的三维有限元简化模型,分析该钢管混凝土组合桁梁-格构墩轻型桥梁在地震作用下的响应特性,讨论进入非线性后桥墩屈服顺序和内力重分布效应。通过与精细有限元模型、实桥测试、振动台试验比较验证了该文建立的简化单梁计算模型的正确性。以桥墩柱肢钢管边缘应变为判断标准,确定了水平最不利地震动输入方向为两端支座连线的法线方向,同时需要考虑竖向地震动的影响。通过地震响应分析表明,在设计地震动下桥梁处于弹性状态;进入塑性后,格构墩和复合墩以面内受力为主,轴力增幅小于地震动增幅,墩顶位移增幅大于地震动增幅;复合高墩面内弯矩增幅大于矮墩,有利于全桥的抗震。
[Abstract]:Taking the second connection of Ganhaizi Bridge as the prototype, a simplified three-dimensional finite element model based on fiber element is established, and the response characteristics of the steel tube concrete composite truss beam-lattice pier light bridge under earthquake action are analyzed. The yield sequence and the redistribution effect of internal force on the pier after entering the nonlinearity are discussed. Compared with fine finite element model, real bridge test and shaking table test, the simplified single beam calculation model established in this paper is proved to be correct. Based on the boundary strain of steel pipe of piers and columns, the normal direction of the most unfavorable input direction of horizontal ground motion is determined, and the influence of vertical ground motion should be considered at the same time. The seismic response analysis shows that the bridge is in an elastic state under the design ground motion, the lattice pier and composite pier are mainly subjected to in-plane force after plastic, the increase of axial force is smaller than that of ground motion, and the increase of displacement at the top of pier is larger than that of ground motion. The increase of in-plane bending moment of composite high pier is larger than that of short pier, which is beneficial to the seismic resistance of the whole bridge.
【作者单位】：福州大学土木工程学院;威尼斯建筑大学;
【基金】：教育部“新世纪优秀人才支持计划”项目(NCET-13-0737) 福建省杰出青年科学基金项目(2012J06013)
【分类号】：TU398.9

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