某宽幅简支梁桥荷载试验研究

发布时间：2018-06-15 12:48

本文选题：荷载试验 + 简支板梁桥　；参考：《沈阳建筑大学学报(自然科学版)》2017年05期

【摘要】：目的为全面了解某宽幅预应力混凝土简支空心板梁桥在荷载作用下的实际承载力,分析其实际工作状态,评定桥梁运营状况.方法基于静载试验,研究在偏载和中载等不利荷载工况下的主梁的应力和变形,通过动载试验的各项内容研究该桥的自振频率、不同行车速度下的变形响应以及跳车试验下的冲击作用,最后将实测结果与理论分析结果进行对比分析.结果桥梁在设计荷载下处于弹性工作阶段.卸载后归零情况正常,残余应变为5%~11%,没有裂缝产生.动力测试结果显示,其第一阶竖向自振频率为5.47 Hz、阻尼比为0.025、冲击系数为1.122~1.190,测试模态与理论模态吻合较好.结论该桥受力处于弹性工作状态,承载能力满足相关规范要求,可以按设计荷载投入使用.
[Abstract]:In order to fully understand the actual bearing capacity of a wide prestressed concrete simply supported hollow slab girder bridge under load, the actual working state of the bridge is analyzed, and the operation condition of the bridge is evaluated. Methods based on the static load test, the stress and deformation of the main beam under the unfavorable load conditions, such as partial load and medium load, were studied, and the natural vibration frequency of the bridge was studied through the dynamic load test. The deformation response under different driving speeds and the impact under the jumping test are analyzed. Finally, the measured results are compared with the theoretical analysis results. Results the bridge is in the elastic working stage under the design load. After unloading, the condition of returning to zero is normal, the residual strain is 5 and 11, no cracks occur. The dynamic test results show that the first order vertical natural vibration frequency is 5.47 Hz, the damping ratio is 0.025, and the impact coefficient is 1.122 ~ 1.190. The measured mode is in good agreement with the theoretical mode. Conclusion the bearing capacity of the bridge is in an elastic working state, and its bearing capacity can meet the requirements of relevant codes, so it can be put into use according to the design load.
【作者单位】：西南交通大学土木工程学院;陆地交通地质灾害防治技术国家工程实验室;
【基金】：国家自然科学基金项目(51308471)
【分类号】：U446.1

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