轴心受压钢套管构件加固理论及应用

摘要

套管构件由内管及外管组成,外管能为内管提供侧向支撑,控制内管失稳,从而提高内管的受压承载力.套管构件是一种新型的钢压杆稳定加固形式,可应用于对受压钢构件失稳比较敏感的一类空间结构.本文首先利用典型的套管构件构造模型,阐述了轴心受压套管加固法的基本原理;然后以一网架工程为例,分析套管加固法对提高结构承载能力的效果.结果表明:套管构件能够有效改善网架结构的局部应力状况,解决了受压钢管的失稳问题,提高了网架结构的极限承载力.%Sleeved members consist of inner and sleeved tubes.The sleeved tube provides lateral support for the inner tube,and controls its instability,thereby enhancing its load-carrying capacity.As a new form for stability improving of compressive steel members,sleeved members can been applied to spatial structures,whose steel members are sensitive to buckling.This paper used a typical detail model of sleeved members to explain the basic principle of the reinforcement method of sleeved members; then taking a bridge of grid structure for example,analyzed this method for increasing the load-carrying capacity of the structure.The result shows that sleeved members can effectively improve the local stress conditions of grid structure,solve the problem of compression steel tubes prone to buckling,and enhance the ultimate load-carrying capacity of grid structure.