一种新型可展拱桥的探索

提出了一种新型的救灾用可展拱桥体系,包括可展桥体系、构件、连接、展开方式等.该可展桥以三角形剪式单元作为基本可展构件,以小型机械牵引,快速展开固定.可展拱桥由可展主拱肋、吊杆、可展桥面板等构件组成,形成了兼具可展性与稳定性的空间结构.对有限元弹性和弹塑性模型进行分析,优化桥体结构,进行线性及非线性屈曲分析.优选方案的线性屈曲安全系数为5.72,非线性屈曲安全系数为2.95,验证了该可展桥的承载能力和结构性能.该可展桥具有构件轻巧、运输方便、施工快捷、承载力大等优点.

Design and Application of New Deployable Bridge

A new deployable bridge for relief was developed. The system,component,connection and deploy method of the new deployable bridge were introduced. The deployable bridge is based on universal scissor components which can guarantee swift expansion and fixation by small machinery. The bridge structure is not only stable but also deployable and consists of deployable arch ribs,rigid columns and deployable decks. The finite element software SAP2000 was used to model and optimize the bridge structure. Cross-section optimization and linear and nonlinear buckling analysis were performed. The safety coefficient of linear buckling of optimal scheme is 5.72 and the safety coefficient of nonlinear buckling is 2.95 which evaluate the structural favorable capacity of the deployable bridge. The deployable bridge is light,easy to transport,reliable,and fast to construct. It can efficiently fix traffic interruption.