火灾后空心板梁桥承载力评定及加固对策研究

发布时间：2018-01-18 03:35

本文关键词：火灾后空心板梁桥承载力评定及加固对策研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：桥梁结构发生火灾后，桥梁的力学性能发生变化，，承载能力可能下降，严重的可能会发生坍塌。空心板梁桥在火灾后承载能力的评价与加固对策研究与验证是恢复交通的关键环节。为保证桥梁能正常使用，需运用相应的加固方法解决火灾后的相应病害，以提高受损桥梁的承载能力，达到确保结构安全和节省国家财产的目的。本文以国家自然科学基金(51308056)—火灾下混凝土桥梁有效预应力衰变机理与承载能力分析方法研究为依托，选取一实例火灾后空心板梁桥为研究对象，主要研究工作有：（1）基于数值模拟分析的方法，进行了热-力耦合场结构分析，得到空心板梁桥承载能力的变化特点及规律，并与实际检测结构进行比较分析，分析火灾导致桥梁破坏的模式；（2）基于荷载试验实测数据，分析各级荷载作用下空心板梁桥结构的整体响应；通过试验测试数据和理论分析结果的比较，从强度、刚度的角度对桥梁整体的承载能力做出判断；（3）针对火灾后桥梁加固设计方案，通过静载试验分析验证火灾后桥梁的加固处理及加固方法的效果。
[Abstract]:After the fire of the bridge structure, the mechanical performance of the bridge changes, and the bearing capacity may decrease. Serious collapse may occur. The evaluation and reinforcement of the bearing capacity of hollow slab girder bridge after fire is the key link to restore traffic. In order to ensure the bridge can be used normally. In order to improve the bearing capacity of damaged bridges, the corresponding reinforcement methods should be used to solve the corresponding diseases after fire. The purpose of ensuring structural safety and saving national property is achieved. The National Natural Science Foundation of China 51308056). Based on the research on the mechanism of effective prestress decay and the analysis method of bearing capacity of concrete bridge under fire. An example of hollow slab girder bridge after fire is selected as the research object. The main research work is as follows: 1) based on the method of numerical simulation and analysis, the structure analysis of thermal-mechanical coupling field is carried out, and the characteristics and rules of load bearing capacity of hollow slab girder bridge are obtained, and compared with the actual detection structure. The mode of bridge damage caused by fire is analyzed. 2) based on the measured data of load test, the overall response of hollow slab girder bridge under various loads is analyzed. Through the comparison of test data and theoretical analysis results, the bearing capacity of the whole bridge is judged from the angle of strength and stiffness. 3) aiming at the design scheme of post-fire bridge reinforcement, the effect of strengthening treatment and strengthening method of post-fire bridge is verified by static load test.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.2;U445.72

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