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以立柱为帽形截面的轻钢龙骨(简称帽钢龙骨)和发泡混凝土共同构成的组合墙体为对象,研究组合墙体中由帽钢立柱和发泡混凝土共同构成的18个组合立柱的轴压承载能力。研究表明:组合立柱的轴压荷载-位移关系曲线包括明显的弹性和下降破坏两个阶段,其中弹性阶段基本为一条直线,且水平位移较小,说明发泡混凝土的包裹对组合立柱的水平位移有明显的束缚作用;外包发泡混凝土组合立柱的轴压承载力是单纯帽钢立柱的2~3倍;由于组合立柱两端帽钢的外露,当帽钢截面的厚度较小时,外露帽钢首先发生局部失稳,发泡混凝土的强度大小对组合立柱的轴压承载力几乎没有影响;而当帽钢厚度足够大时,随着外包发泡混凝土的强度增加,组合立柱的轴压承载力也随之增大,其破坏形式为发泡混凝土被压碎。
The composite wall composed of light steel keel (cap steel keel) and foamed concrete with columnar hat-shaped section is taken as research object to study the erection of 18 composite columns composed of cap steel column and foamed concrete in combined wall Axial pressure carrying capacity. The research shows that the axial load-displacement curve of the composite column includes two stages of obvious elasticity and destructive failure, in which the elastic phase is basically a straight line and the horizontal displacement is small, indicating that the horizontal displacement of the composite column Which has a significant restraint effect. The axial compressive bearing capacity of the composite foam concrete column is 2 ~ 3 times that of a simple cap steel column. When the thickness of the cross section of the cap steel is small due to the exposure of both ends of the cap steel, Firstly, local instability occurs and the strength of foamed concrete has almost no effect on the axial compressive bearing capacity of the composite column. When the thickness of the cap steel is large enough, with the increase of the strength of the outsourced foamed concrete, the axial compressive bearing capacity of the composite column With the increase, the destruction of foam concrete is crushed.