大跨径钢管混凝土桁架拱桥稳定性分析.pdfVIP

7 1 Vol7 No1 2010 2 JOURNAL OF RA ILWAY SC IENCE AND ENG INEER ING Feb. 2010 * , (郑州大学 土木工程学院, 河南郑州450001) : 对小三峡大桥主桥即中承式钢管混凝土桁架拱桥的空间 定性进行了分析采用 M idas/civil有限元程序建立该拱 桥的空间有限元计算模型, 对其进行了空间 定性计算与分析计算结果表明: 该拱桥拱肋的横向刚度较小, 可以通过优化 拱肋截面尺寸与改善横撑结构形式达到提高拱肋横向刚度的目的; 桥面系面外刚度略小, 需要加强预制小T 梁与横梁的连 接, 同时加大边纵梁的截面尺寸并与横梁固结, 以提高桥面系的面外刚度, 使桥面系形成强大的梁格体系, 共同抵抗外荷载 的作用 : 钢管混凝土桁架拱桥; 有限元法; 定性 + : U448. 22 4 : A : 1672- 7029( 2010) 01- 0007- 04 Stability analysis of long span on rete filled steel tubular truss ar h bridge WA G Yan, CHE Huai ( School of CivilEngineering, Zhengzhou University, Zhengzhou 450001, China) Abs tract: Spacial stability analysis for the main bridge of Xiao San- xia bridge, .i e., a half though concrete filled steeltubular truss arch bridgewas carried out. The spacial finite element calculating modelof thebridgewas established by adopting finite elementprogram M idas/civil to calculate and analyze the stability of thebridge. The results show that the transverse stiffnessof arch rib isweak, so optmi izing the section of arch rib and the structural form of transverse bracingsmay mi prove it. The outofplane stiffness of the floor system is alsoweak, the follow ing m easures should be taken, such as strengthening the connections bewt een prefabricated T stringers and floor beam s, increasing the section size ofborder stringers and linking themw ith the floor beams rigidly, so that theout of plane stiffness of the floor system can be mi proved and the floor system can be a powerful floor beams and stringers to resist the out