基于有限元的盘扣式钢管满堂支架稳定性研究分析

Stability of full-supported disc buckle steel pipe based on finite element

满堂支架体系因通用性强、易安装拆卸、承载力高等特点,在桥梁上部结构中得到广泛应用。但近年来满堂支架坍塌的事故屡见不鲜,对人员生命安全造成巨大威胁。本文基于实际工程,采用有限元模拟的方法建立空间模型,对盘扣式钢管满堂支架的稳定性进行分析。结果表明:盘扣式满堂支架结构体系在连续现浇箱梁的施工过程中具有良好的工作性能,满足强度、刚度和稳定性的要求,具有一定的富余度;盘扣式钢管满堂支架顶托不易过长,过长容易导致上部结构失稳,或者可以采用剪刀撑连接减少自由长度。

The full support system has been widely used in the bridge superstructure because of its strong versatility,high bearing capacity,and easy simplicity during installation and disassembly processes.However,incidents of collapsed stents have been common in recent years,posing a huge threat to the lives and safety of personnel.Based on the actual project,this paper uses the finite element simulation method to establish a space model,and analyzes the stability of the full-supported disc buckle steel pipe.The results show that the full-supported disc-buckle structure has good working performance during the construction of continuous cast-in-place box girder,meets the requirements of strength,rigidity and stability,and has a certain degree of surplus.Full-supported disc-buckle steel pipe should not be too long,which will easily lead to instability of the upper structure,or the free length can be reduced by connecting with scissors.