圬工拱桥重要性系数分布与倒塌模式相关性研究  

Study on correlation between importance coefficient distribution and collapse mode of masonry arch bridge

作　　者：彭卫兵[1] 史贤豪[1] 刘萌成[1] 谢波[1] 

机构地区：[1]浙江工业大学,浙江杭州310014

出　　处：《土木工程学报》2013年第6期110-116,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(50908211);交通部西部交通建设科技基金(200831822343);浙江省省级重点创新团队课题(2012R10035-12)

摘　　要：系统研究基于广义刚度法的构件重要性评价理论在桥梁结构倒塌过程分析中的应用,具体包括以下内容:①推导基于实体单元高斯点应力计算的单元重要性系数计算公式;②用C#和VS.net 2005编程实现单元重要性系数的计算和显示程序的开发;③采用上述程序研究悬臂梁重要性系数的分布以及在重要性系数最大的单元旁进行加固后结构重要性系数的变化;④进一步研究双跨圬工拱桥在试验荷载作用下的重要性系数分布与倒塌模式的关系,并与试验结构进行对比验证。研究结果表明:①在重要性系数最大的单元处进行加固将有效降低最大结构重要性系数,并能使单元重要性系数分布均匀;②结构重要性系数分布局部峰值对应着破坏时可能出现塑性铰的最大个数,且塑性铰出现的顺序由重要性系数局部峰值高的位置向重要性系数局部峰值低的位置传递;③线弹性计算结构重要性系数局部峰值分布位置与考虑结构材料非线性计算结果一致,但方差更大。The application of the component importance evaluation theory in collapsing process analysis of bridge is studied based on the Generalized Rigidity Method. The research includes the following aspects： ① the calculation formula of unit importance coefficient is deduced on the basis of Gauss point stress calculation in solid element, ② the calculation of unit importance coefficient and the display program are realized using C # and VS. net 2005, ③the importance coefficient distribution of cantilever beam structure and the changes of importance coefficient after reinforcement in the side of the maximum unit are also discussed, ④ the further research will focus on the correlation between importance coefficient distribution and collapse mode of two-span masonry arch bridge under the test load. The results indicate that the reinforcement on the element with maximum coefficient can effectively reduce the importance coefficient and make the unit importance coefficient distribution smoother. In addition, the local peak of importance coefficient distribution corresponds to the possible maximum number of plastic hinge when the unit is damaged, and the appearance order of plastic hinge is arranged from high position to low position by the local peak of importance coefficient distribution. For the local peak distribution of unit importance coefficient, the results calculated by linear elastic theory agree well with the circumstance considering material nonlinearity but the variance is bigger.

关 键 词：广义刚度法 实体单元 单元重要性系数 倒塌模式 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]