斜拉桥承载力的评定方法

发布时间：2018-02-27 02:09

本文关键词： 桥梁工程承载力模态实验 MIDAS计算斜拉桥　出处：《公路交通科技》2014年03期 　论文类型：期刊论文

【摘要】：以某斜拉桥为试验对象,介绍了预应力混凝土斜拉桥承载力的评定方法。通过静载和动载试验,获得了桥梁控制截面的应变、挠度等随加载变化的情况;通过理论值与试验值的对比分析,对桥梁的承载能力和安全性能进行了研究,以检验桥梁结构在试验荷载作用下的实际受力状况是否满足设计及规范要求。结果表明:各测点应变、挠度、索塔偏位和索力测试校验系数均满足规范关于校验系数的规定;桥梁结构的实际刚度能满足公路Ⅰ级荷载使用要求,且有一定的安全储备;试验结构实测残余挠度均不大于20%,表明结构在试验荷载作用下尚处于弹性工作状态;以动载试验和测量数据建立的模型分析可知桥梁振动正常,实测结构阻尼反映其阻尼系数较小,说明桥梁结构振动衰减正常,无明显结构损伤缺陷,试验桥梁符合规范要求。
[Abstract]:Taking a cable-stayed bridge as the test object, this paper introduces the evaluation method of the bearing capacity of the prestressed concrete cable-stayed bridge. Through static and dynamic load tests, the strain and deflection of the control section of the bridge are obtained. Through the comparison and analysis of the theoretical and experimental values, the bearing capacity and safety performance of the bridge are studied. In order to test whether the actual stress condition of bridge structure under test load meets the requirements of design and specification, the results show that the check coefficients of strain, deflection, tower deflection and cable force of each measuring point meet the requirements of the code. The actual stiffness of the bridge structure can meet the requirements of highway class I load and has certain safety reserve, the measured residual deflection of the test structure is not more than 20, which indicates that the structure is still in elastic working state under the action of test load. The model analysis based on dynamic load test and measurement data shows that the vibration of the bridge is normal, and the damping coefficient of the measured structure is small, which indicates that the vibration of the bridge structure attenuates normally and there is no obvious structural damage defect, and the test bridge meets the requirements of the code.
【作者单位】：西安工业大学建筑工程学院;
【分类号】：U448.27;U441

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