桥梁结构薄弱部位识别理论及极限承载力计算方法  

Recognition Theory for Weak Parts of Bridge Structure and Calculation Method for Ultimate Bearing Capacity

作　　者：彭卫兵[1] 潘若丹 谢波 史贤豪 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014 [2]宁波城建投资控股有限公司,浙江宁波315010 [3]宁波通途投资开发有限公司,浙江宁波315010

出　　处：《中国公路学报》2014年第9期66-73,共8页China Journal of Highway and Transport

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)

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。In order to provide method and reference for the reinforcement of dangerous bridges and old bridges, based on the structural experiment, this paper made a systematic research and verification on the recognition theory for weak parts of bridge structure and finite element calculation method for ultimate bearing capacity with the consideration of structural nonlinearity. The calculation theory for component importance coefficient was studied, and the recognition theory for weak parts of bridge structure was proposed, according to the correlation between importance coefficient distribution and appearance location and order of plastic hinge when two- span masonry arch bridge was damaged. The model experiment on concrete beam reinforced with CFRP was designed, through which further research was made on the actual effect of the reinforcement with CFRP or steel, and the correctness of finite element calculation method forultimate bearing capacity using plastic damage model was verified. Taking Beijing Baihe Bridge and Wenzhou Jiuzhang Bridge as background engineering, the applications of the recognition theory for weak parts of bridge structure and finite element calculation method for ultimate bearing capacity in rigid-framed arch bridge reinforcement were studied. The results show that the local peak of importance coefficient distribution represents the weak part of bridge structure and the importance of weak parts is arranged following the value of local peak. The reinforcement with externally anchoring steel plates in weak parts of rigid-framed arch bridge can reduce the local peak of importance coefficient distribution and effectively improve the ultimate bearing capacity of the bridge.

关 键 词：桥梁工程 桥梁结构薄弱部位 试验研究 重要性系数 极限承载力 刚架拱桥 

分 类 号：U441[建筑科学—桥梁与隧道工程]