短肢钢管束组合墙受力性能参数影响分析

PARAMETER ANALYSIS OF MECHANICAL PROPERTIES OF SHORT STEEL TUBE BUNDLE COMPOSITE WALL

短肢钢管束组合墙由U型钢及混凝土组成,肢长较短,介于钢管束组合柱与剪力墙之间。对此种新型短肢钢管束组合墙受力性能进行研究,建立了短肢钢管束组合墙的有限元模型,将结果与短肢钢管束组合墙在反复荷载作用下试验所得的结果进行比较,验证了该模型的准确性。在此基础上,通过改变构件的钢板厚度、混凝土强度、钢板强度、轴压比、剪跨比、U型钢尺寸(加劲肋板数)参数,进行有限元模拟。分析结果表明:短肢钢管束组合墙荷载-位移滞回曲线饱满,没有明显的捏缩现象;钢板厚度、剪跨比对构件承载力影响很大,混凝土强度、钢板强度、轴压比对构件承载力有一定影响;短肢钢管束组合墙延性受混凝土强度、钢材强度、轴压比的影响,在轴压比增大到0.5以上时短肢组合墙延性显著降低。

Short steel tube bundle composite wall is composed of U-shaped steel and concrete,and the leg length of them are shorter than steel tube bundle composite shear walls but longer than steel tube bundle composite columns.To analyze the mechanical properties of a new proposed short steel tube bundle composite wall,the finite element analysis models of short steel tube bundle composite wall were proposed. The analysis results were compared with experimental results,it was shown that the computational results were acceptable. On the basis,by changing the thickness of the steel plate,concrete strength,steel plate strength,compression ratio,shear-span ratio,U-beam size（ the number of stiffening ribs）,the finite element simulation was conducted in the paper. The results showed that load-displacement hysteretic curves of the short steel tube bundle composite wall were plump,and had no obvious pinching phenomenon. Furthermore,steel plate thickness and shear-span ratio had great impact on the bearing capacity of member; concrete strength,steel plate strength and compression ratio had a certain influence on the bearing capacity of member; the ductility of short steel tube bundle composite wall was affected by concrete strength,steel plate strength and compression ratio,the ductility of member significantly decreased when compression ratio increased to more than 0. 5.