王骞.SCWCBM中钢悬臂优化设计[J].,2013,53(2):227-233 |
SCWCBM中钢悬臂优化设计 |
Optimization design of steel cantilever in SCWCBM |
投稿时间:2013-03-13 修订日期:2013-03-14 |
DOI:10.7511/dllgxb201302012 |
中文关键词: 钢筋混凝土箱梁 正交异性钢悬臂板拓宽方法 接触面受力 拓扑理论 优化设计 |
英文关键词: reinforced concrete box girder orthotropic steel cantilever widening method interface stress topological theory optimization design |
基金项目:国家自然科学基金资助项目(71101014); 教育部博士学科点专项科研基金资助项目(200801411105); 中央高校基本科研业务费专项资金资助项目(DUT10JS10). |
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中文摘要: |
混凝土箱梁正交异性钢悬臂板拓宽方法(SCWCBM)是一种新型的不增设桥墩的箱梁拓宽方法.采用该法加宽后整个结构能协同安全工作的重要前提是确保钢悬臂结构与混凝土后浇隔板间的接触面受力合理,在此前提下,引入拓扑优化理论以指导钢悬臂梁的外形设计,并结合施加预应力的钢悬臂结构的受力特点,推导出保证接触面受力合理的横向体外预应力筋位置的理论范围的解析式.最终提出基于钢\|混凝土接触面受力问题的钢悬臂优化设计思路:先对钢悬臂的外形进行拓扑优化计算,再利用推导出的解析式求出横向体外预应力筋位置的理论范围,随后进行接触面加劲肋的细部设计,最后验算接触面应力.按照该思路进行SCWCBM中钢悬臂优化设计可以减少不必要的试算次数,节约计算资源,为SCWCBM的推广提供理论支持. |
英文摘要: |
Orthotropic steel cantilever widening concrete box girder method (SCWCBM) is a new box girder widening method without piers. Ensuring the reasonable stress on the interface between the steel cantilever and the concrete post-diaphragm is an important precondition to guarantee the entire structures widened by SCWCBM work together. On this basis, the topological optimization theory is applied to the shape design of steel cantilever beam. The mechanical model for the prestressed steel cantilever is built and the analytical expression of the reasonable acting position of the transverse external tendon on the steel cantilever is deduced. At last, based on the issue of steel-concrete interface contact state, the steel cantilever optimization designing idea is proposed: firstly, designing the optimum topological shape of the steel cantilever, and determining the acting position of the transverse external tendon by the deduced analytical expression; and then, designing the ribs on the steel interface; finally, calculating the stress of the contact surface. According to the optimization design idea, the times of trial calculation can be decreased and the resources of computing are economized effectively. The research results provide theoretical support for the popularization and application of SCWCBM. |
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