外包发泡混凝土角钢龙骨组合墙体抗侧力试验及分析

EXPERIMENTAL RESEARCH AND ANALYSIS ON LATERAL BEARING CAPACITY OF COMPOSITE WALL WITH LIGHT-GAUGE ANGLE STEEL WRAPPED IN FOAMING CONCRETE

由轻钢龙骨和发泡混凝土共同组成的墙体具有承载力高、装修方便、保温防火性能好、造价便宜等优势,具有很好的应用前景,但相关研究较少。以由┗40×10×0. 8卷边角钢构成的4个格构角钢立柱和LC3. 0发泡混凝土共同组成的3 m×1. 8 m×0. 2 m组合墙体为对象,对墙体试件在水平荷载作用下的受力特性、破坏形式和极限承载力进行了试验研究和有限元分析。研究结果表明:当水平荷载较小时,发泡混凝土与钢龙骨之间咬合较好,相互协调变形,组合墙体具有较大的抗侧刚度,墙体荷载-水平位移关系处于弹性状态;随着水平荷载的不断加大,墙体开始产生裂缝,混凝土与角钢龙骨的协同作用逐步减弱,部分混凝土退出工作,角钢立柱所受荷载增加,墙体抗侧刚度开始下降,并逐渐形成一条从墙体上端加载点开始沿对角线分布的主裂缝,墙体最终沿着主裂缝破坏,且格构角钢立柱亦发生不同程度的弯曲扭转变形;分别采用ABAQUS中的壳单元和梁单元模拟格构角钢龙骨和发泡混凝土,得到墙体试件的极限承载力与试验数据相差15%左右,说明有限元建模方法的正确和合理性。

Composed of light gauge steel and foaming concrete, the composite wall has the advantages of high bearing capacity, convenient decoration , good fire prevention and insulation performance, low cost and has good application prospects. But related research of the composite wall was few. In the paper, the composite wall with dimension of 3 m×1. 8 m×0. 2 m, composed of four lattice steel columns with |_40×10×0. 8 lipped angle and LC3. 0 foaming concrete, was taken as the research object. The mechanic properties, failure mode and ultimate bearing capacity of the composite wall under horizontal loading were studied through experiment and finite element analysis. The research results showed that: when the horizontal load applying on the composite wall was small, there was a good occlusion and compatibility deformation between the foaming concrete and steel keel, the wall had a big lateral resisting stiffness, and the horizontal load-displacement relationship was in the elastic state. With the horizontal load increasing, the cracks were produced in the wall, the synergistic effect between concrete and steel keel were weakened gradually , part of the concrete were out of work, the loading applying on the steel angle columns increased, the lateral stiffness of the wall decreased , a main crack gradually formed along the diagonal line of the wall from the loading point, and the wall finally failed along the main crack , and it was found that there were different degrees of bending and torsion deformation for the four steel lattice angle columns. The shell element and beam element in ABAQUS were used to simulate the steel lattice columns and foam concrete separately, and the ultimate bearing capacity under the horizontal loading based on analysis had about 15% difference with the experimental data, showing the finite element modeling method was correct and reasonable.