桥梁结构薄弱部位识别理论及极限承载力计算方法

发布时间：2018-04-25 11:46

本文选题：桥梁工程 + 桥梁结构薄弱部位　；参考：《中国公路学报》2014年09期

【摘要】：为给危桥和旧桥的加固提供方法和参考,在结构试验的基础上系统研究和验证了桥梁结构薄弱部位识别理论及考虑结构非线性的极限承载力有限元计算方法。开展了构件重要性系数计算理论研究,并针对双跨圬工拱桥的重要性系数分布与发生破坏时塑性铰位置及顺序的相关性提出了桥梁结构薄弱部位识别理论;设计碳纤维布加固混凝土梁模型试验,研究了粘贴碳纤维布或钢板加固混凝土梁的实际效果,验证了采用塑性损伤模型的极限承载力有限元计算方法的正确性;以北京白河桥和温州九丈大桥为背景工程,研究了桥梁结构薄弱部位识别理论和极限承载力有限元计算方法在刚架拱桥加固中的应用。研究结果表明:重要性系数分布的局部峰值代表桥梁结构薄弱部位,各薄弱部位的重要性按照局部峰值大小依次排序;在刚架拱桥薄弱部位进行锚贴钢板加固可降低重要性系数分布的局部峰值,同时可有效提高桥梁的极限承载力。
[Abstract]:In order to provide the method and reference for strengthening dangerous bridge and old bridge, the identification theory of weak part of bridge structure and the finite element calculation method of ultimate bearing capacity considering the nonlinearity of structure are systematically studied and verified on the basis of structural test. The calculation theory of component importance coefficient is studied, and the identification theory of weak position of bridge structure is put forward according to the correlation between the distribution of the importance coefficient and the position and sequence of plastic hinge in the failure of double-span masonry arch bridge. The model test of CFRP reinforced concrete beam is designed, and the practical effect of CFRP or steel plate reinforced concrete beam is studied, and the validity of finite element calculation method of ultimate bearing capacity using plastic damage model is verified. Taking the Baihe Bridge in Beijing and Jiuzhang Bridge in Wenzhou as the background, the paper studies the application of the theory of identifying the weak part of the bridge structure and the finite element calculation method of the ultimate bearing capacity in the reinforcement of the rigid arch bridge. The results show that the local peak value of the distribution of the importance coefficient represents the weak part of the bridge structure, and the importance of each weak part is in order of the local peak value. The local peak value of the distribution of the importance coefficient can be reduced by strengthening the steel plate in the weak part of the rigid arch bridge, and the ultimate bearing capacity of the bridge can be improved effectively at the same time.
【作者单位】：浙江工业大学建筑工程学院;宁波城建投资控股有限公司;宁波通途投资开发有限公司;
【基金】：国家自然科学基金项目(50908211) 浙江省省级重点创新团队课题资助项目(2012R10035-12) 浙江省自然科学基金项目(LY13E080014)
【分类号】：U441

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