斜交简支梁桥地震碰撞反应参数分析

发布时间：2018-01-08 03:24

本文关键词：斜交简支梁桥地震碰撞反应参数分析　出处：《振动与冲击》2017年03期 　论文类型：期刊论文

【摘要】：为研究斜交简支梁桥地震碰撞反应,采用开放式地震模拟软件Open Sees,建立能够考虑梁体与桥台间纵向碰撞、摩擦作用及梁体与挡块间横向碰撞效应的斜交简支梁桥精细化动力计算模型,分析水平地震动输入方向、竖向地震动和斜度等对斜交简支梁桥地震碰撞反应的影响规律。结果表明:忽略横向碰撞时,斜度为α的简支梁桥梁端纵向最大位移、上部结构峰值转角在水平地震动以角度θ=90°-α输入时达到极小值;考虑横向碰撞后,由于挡块的有效限位作用,梁端纵向最大位移、上部结构峰值转角会减小,竖向地震动对地震碰撞反应的数值有一定影响,但对其随斜度的变化规律没有明显影响,钝角处支座上拔力随斜度增大而增大,锐角处支座上拔力随斜度增大而减小,且支座上拔力由钝角处向锐角处逐渐减小,考虑水平地震动输入方向影响时,梁端纵向最大位移随斜度增大而增大,上部结构峰值转角、梁端纵向最大碰撞力随斜度增大呈先增大后减小的变化规律,梁体与挡块间横向最大碰撞力随斜度的增大总体变化不大。
[Abstract]:For the study of skew beam bridge seismic pounding response, using open software Open Sees simulation is established to consider the earthquake, beam and abutment longitudinal collision, friction calculation model and beam and the pounding effects between blocks of skew beam bridge fine dynamic analysis of water, ground motion input direction, vertical influence vibration and inclination of skew beam bridge seismic pounding response. The results show that neglecting transverse collision, the slope is simply supported bridges alpha end longitudinal displacement, peak angle in the upper structure with angle theta = 90 DEG alpha input reaches a minimum level of ground motion; considering the transverse impact, because the effective limit stop the role of Liang Duan block, maximum longitudinal displacement of superstructure, peak angle decreases, the vertical ground motion on the seismic numerical collision reaction have a certain influence, but the variation of slope is not obvious Influence of bearing uplift force at obtuse angle increases with the increase of slope, bearing pull force with an angle angle increases, and the bearing force of pull up from an obtuse angle to an angle decreases, considering the influence of horizontal ground motion input direction, the vertical beam maximum displacement increases with the slope increases, the upper structure of the peak angle the vertical beam, the maximum collision force showed a trend of first increase and then decrease with the increase of slope, beam and block between the maximum lateral force with the increase of the inclination of the collision did not change.

【作者单位】：石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室;石家庄铁道大学大型结构健康诊断与控制研究所;
【基金】：国家自然科学基金(51508347) 河北省自然科学基金(E2015210038) 河北省高等学校重点学科项目资助
【分类号】：U442.55
【正文快照】： 斜交桥能够适应地形地物的限制及较复杂的城市道路,在高速公路、城市立交中得到广泛应用。地震发生时,斜交桥由于自身不规则的结构形式,比直桥更容易受到破坏。如1971年美国圣费尔南多(San Fernan-do)地震中Foothill Boulevard下穿式立交桥上部结构在一侧桥台处发生了约8 cm的

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