随机实测车辆荷载下大跨径斜拉桥钢箱梁的动力响应特征

发布时间：2018-06-13 11:43

本文选题：钢箱梁 + 实测车流　；参考：《河海大学学报(自然科学版)》2014年05期

【摘要】：依据南京长江第三大桥的实测交通流统计数据,结合等效疲劳损伤原理建立随机状态下的车辆荷载谱,基于有限元数值仿真程序进行全桥动力响应分析。通过计算大桥在实测车流作用下主梁不同位置位移和内力的动力响应时程曲线,分析车辆运营时程内主梁截面内力变化及动力放大系数。结果表明:随机车流作用下大桥主梁塔根处弯矩及轴力绝对值最大,跨中处弯矩及轴力变化幅值最大,而在1/4跨位移动力响应最大。跨中、1/4跨和塔根附近截面在时程内的最大应力幅值处,动力放大系数在1.00~1.03之间,动力放大系数比单考虑弯矩或轴力时稳定,且动应力放大系数与国内现行规范的动力放大系数较为吻合。
[Abstract]:Based on the traffic flow statistic data of Nanjing Yangtze River third Bridge and the equivalent fatigue damage principle, the vehicle load spectrum under random state is established, and the dynamic response of the bridge is analyzed based on the finite element numerical simulation program. By calculating the dynamic response time history curve of the main beam displacement and internal force at different positions under the action of vehicle flow, the variation of the internal force and the dynamic magnification factor of the main beam section in the vehicle operation history are analyzed. The results show that the absolute value of bending moment and axial force at the root of the main girder tower is the largest, the amplitude of bending moment and axial force in the middle of span is the largest under the action of random traffic flow, and the dynamic response of displacement is the largest at 1 / 4 span. The dynamic magnification factor is between 1.00 and 1.03 at the maximum stress amplitude of the cross-section near the tower root and 1 / 4 span, and the dynamic magnification factor is more stable than that when the bending moment or axial force is taken into account. And the dynamic stress magnification coefficient is in good agreement with the dynamic magnification factor of the current domestic code.
【作者单位】：河海大学土木与交通学院;苏州市航道管理处;泰州大桥有限公司;
【基金】：国家自然科学基金(51278166) 高等学校博士学科点专项科研基金(20120094110009)
【分类号】：U448.27;U441.3

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