曹轲+李国强+陆烨

摘要：基于《钢结构设计规范》（GB 50017—2003），利用三柱子框架模型推导了无侧移半刚性连接箱式模块化框架柱计算长度系数方程，给出了基于分析假定的柱计算长度系数理论解，提出了针对无侧移半刚性连接箱式模块化框架柱计算长度系数的实用计算公式；通过对比理论计算结果和有限元分析结果，验证了实用计算公式的精确性与适用性；研究了无侧移半刚性连接箱式模块化框架柱计算长度系数的各影响因素。结果表明：柱计算长度系数除了受到半刚性节点刚度变化的影响外，还受到上下相邻模块框架梁对框架柱约束系数比值的影响；当上下相邻模块框架梁对框架柱约束系数的比值均为1时，柱计算长度系数不随节点刚度变化而变化。

关键词：计算长度系数；稳定分析；半刚性连接；无侧移箱式模块化框架

中图分类号：TU323.5文献标志码：A

Stability Analysis of Nonsway Modular Frame with Semirigid ConnectionCAO Ke1， LI Guoqiang1，2， LU Ye1，2

（1. College of Civil Engineering， Tongji University， Shanghai 200092， China； 2. State Key Laboratory for

Disaster Reduction in Civil Engineering， Tongji University， Shanghai 200092， China）Abstract： Based on Code for Design of Steel Structures（GB 50017—2003） and using the three column subassemblage model， a governing equation for determining the effective length factor of column for nonsway modular frame with semirigid connection was derived. Furthermore， the theoretical solution to evaluate the corresponding column effective length factor was proposed. The effectiveness and accuracy of the simplified calculation formulas were illustrated through comparing the theoretical calculation results and finite element analysis results. At last， influencing factors of effective length factor of column for nonsway modular frame with semirigid connection were investigated. The results show that the effective length factor is affected not only by the connection stiffness but also by the ratio of modified relative stiffness factor. When the ratio of modified relative stiffness factor is 1， the effective length factor doesnt change with connection stiffness.

Key words： effective length factor； stability analysis； semirigid connection； nonsway modular frame

0引言

箱式模块化钢结构建筑是预制装配式钢结构建筑的一种具体形式，它是将单个房间作为预制单元，在工厂预制后运到工地进行现场安装。每一个预制单元可为带有采暖、给排水及照明等所有管网的装修完备的房间单元。作为集成化程度很高的预制装配式建筑，箱式模块化建筑已经成为新型建筑技术的主要发展方向之一[1]。

目前针对钢框架的研究与设计中常把梁、柱间连接假定为理想的刚接或铰接，然而实际工程中大多数连接介于两者之间，为半刚性连接[2]。普通的半刚性连接是指框架中梁、柱间连接节点为半刚性节点。……