圆弧拱形钢管在水平荷载作用下的P—△效应  

Circular A rch Steel Pipe Horizontal Displacement Due to Horizontal Load under Vertical Load Exerts A dditional Moment on the Support

作　　者：郭天木[1] 

机构地区：[1]中国市政工程西南设计研究院,成都610081

出　　处：《特种结构》2005年第3期1-3,共3页Special Structures

摘　　要：无铰圆弧拱形钢管结构设计中,通常计算由竖直荷载引起的平面内内力M_x、N_x、Q_x和水平荷载引起的平面外内力M_y、T、Q_y,然后进行内力合成和强度校核。现有文献均没有考虑由于水平位移后在垂直荷载作用下所产生的对支座的附加力矩。这个附加力矩到底有多大,工程设计中能否忽略不计?本文从理论上推导出拱形钢管出平面的水平位移及由此引起的附加力矩的实用计算公式。Hi ngeless circular arch steel pipe structure design,usually calculate inside the plan internal force Mx,Nx,Q due to vertical load and outside plan internal force My,T, Qy due to horigontal load. After ward internal force combination and strength check are conducted. Additional moment on the due to horizontal displacemeat is not to be considered in all current documents. What is the magnitude support of this additional moment can be neglected or not？In this paper, the additional moment due to horizontal displacement practical calculation formula is derived.

关 键 词：附加力矩 附加扭矩 水平荷载 竖直荷载 矢跨比 水平荷载作用 圆弧形 P-△效应 钢管 拱形 

分 类 号：TU392.3[建筑科学—结构工程]