【摘要】 剪式可展桥能够快速搭建灾后应急通道，提高救援效率.针对剪式机构刚度差、材料利用率低等特点，结合弦支体系提出了一种新型的应急用弦支剪式可展桥梁结构.为研究其结构的承载性能，采用Karamba3D建立有限元模型，在移动荷载作用下对撑杆长度、撑杆数目、剪叉杆截面、初始预应力幅值、剪叉角度等影响因素进行了参数化分析，并利用Galapagos模块以结构最低质量为优化目标对弦支剪式可展桥进行优化设计.结果表明：增大撑杆长度、撑杆数目和初始预应力能够有效减少剪式机构应力和挠度；增大剪叉角度使剪式机构应力和挠度增大，而增大剪叉杆截面厚度会减少剪式机构应力，但会增大其挠度；剪式机构依然以受弯为主；优化使结构质量减少38.89%,且优化后弦支剪式可展桥的应力和挠度大约是其对应剪式可展桥的0.25倍和0.2倍，验证了弦支剪式可展桥的优越性.更多还原

【Abstract】 Scissor-like bridges can quickly build emergency channels after disasters and improve rescue efficiency. In view of the characteristics of poor stiffness and low material utilization of scissor-like elements(SLEs), a new cable supported scissor-like deployable bridge(CSSDB)for emergency was proposed combined with cable supported system. In order to investigate the behavior of CSSDB, Karamba3D was adopted to establish the finite element model, and parametric analysis was carried out under the action of moving vehicle load, considering the struts’ length and numbers, the SLEs’ cross section, the initial prestress amplitude and the expansion angle. Besides, Galapagos was used to optimize the CSSDB with the minimum structural mass as the optimization objective. The results show that increasing struts’ number, struts’ length and initial prestress can effectively reduce the stress and deflection of SLEs, while the stress and deflection can be increased by increasing expansion angle. Increasing thickeness of SLEs’ cross section reduces stress and increases deflection instead, and the CSSDB’s performance is still dependent on bending of SLEs. The optimization reduces structural mass by 38.89%, and the stress and deflection of CSSDB are 0.25 and 0.2 times than that of the corresponding scissor-like bridge, which proves the superiority of the CSSDB.更多还原