摘要
建立平面与空间有限元模型,对郑州黄河公路钢管混凝土系杆拱桥(二桥)的活载横向分布系数、横梁、拱肋和系梁的受力特点进行比较分析,重点考察结构的空间效应问题,并分析了结构第一类空间稳定系数及其主要影响因素。分析结果表明,活载横向分布系数采用杠杆法与空间分析结果相近,可用于设计计算之中;系梁承受有较大的扭矩;吊杆横梁的受力性质接近于简支梁,而端横梁的受力要进行空间分析,考虑系梁扭矩的作用;K撑中的斜撑和系梁安装支架对提高结构稳定系数贡献较大。
The Second Highway Bridge over Yellow River is located in the national highway trunk linking the north to the south from Beijing to Zhuhai in Guangdong Province. The main part consists of 8 identical 100m Concrete Filled Steel Tubes (CFST) tied arch bridge. In this paper, both plane and space finite element models are developed to analyze lateral distribution coefficients of live load, behaviors of cross beam, arch rib and tie girders, emphasis on the spatial effect of the structure. And the elastic buckling of the bridge is also be investigated by the space finite element model. The analysis results show that the lateral distribution coefficients of live load calculated by from the principle of the lever distribution are almost equal to the result from the space FEM, so the principle of lever distribution can be used in the design calculation; the tie girder beam is subject to considerable torsion moment; the hanger crossbeam's structural behavior is similar to simple beam while end cross beam is influenced by tie beam and should be analyzed by space FEM; and the batter brace and supporting frame of tie beam contribute to stability prominently.
出处
《福建工程学院学报》
CAS
2004年第1期17-22,共6页
Journal of Fujian University of Technology
基金
国家自然科学基金项目(50078016)
河南省重大科技项目(2001D04).
