基于验证荷载法的在役混凝土简支梁桥的时变可靠度分析

发布时间：2018-03-14 22:15

本文选题：梁式桥　切入点：荷载效应　出处：《辽宁工程技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国在役桥梁中,大多数为梁式桥,随着时间的推移及时代的发展,桥梁的抗力都在逐渐的降低,损伤也都在增加,并且由于大吨位超载车辆的增加,部分已损伤的桥梁的可靠性降低的速度越来越快。因此科学的并且切合实际的对桥梁结构可靠度的计算及寿命预测课题十分必要。而目前对抗力的分析,很多时候是间接的办法,由于受到各个因素的影响,结果的精确性受到了限制。本文在前人理论研究的基础上,对以下几点进行了研究：1.对任意继续使用期车辆及人群荷载效应的分布函数及其特征值进行总结,对抗力的衰减函数及衰减函数对特征值的影响进行分析。2.使用有限元软件midas对实际桥梁加载进行模拟,利用失效概率及可靠度理论对混凝土空心板简支梁桥的可靠度进行计算。3.在验证荷载的基础上对桥梁可靠度其再次进行计算,对计算结果进行分析。4.对验证荷载的实质及验证荷载水准进行分析和计算。5.分别根据时变可靠度曲线及最低可靠指标对桥梁结构的寿命进行预测。
[Abstract]:China's existing bridges, mostly beam bridge, with the development of times and over time, the bridge resistance are gradually reduced, the damage are on the increase, due to the increase of large tonnage and overloading of vehicles, reduce the reliability of the damaged part of the bridge more and more quickly. So it is necessary to science and practical for bridge structural reliability calculation and life prediction of subject. At present against the force analysis, most of the time is the indirect way, due to the influence of various factors, the accuracy of the results is limited. Based on the theoretical research of the former, the following points were studied: distribution 1. for any function to continue to use the vehicles and the crowd load effect and its characteristic value are summarized, and the attenuation function of resistance attenuation function influences on the eigenvalues of.2. using finite element analysis software Mida S on the actual bridge loading is simulated using the failure probability and reliability theory, reliability of concrete hollow slab beam bridge is calculated based on the.3. test load on the reliability of the bridge is calculated again, the results are analyzed to verify the.4. load. And the test load level are analyzed and calculated respectively.5. according to the time-varying reliability curve and the minimum reliability index of bridge structure life prediction.

【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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