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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-limb steel pipe bundle wall composed of U-shaped steel and concrete, short limb length, between the steel pipe bundle column and the shear wall. The research on the mechanical performance of the new short-limb steel tube bundled composite wall is carried out. The finite element model of short-limb steel tube bundled composite wall is established. The results are compared with those obtained from the test of short- Verify the accuracy of the model. Based on this, the finite element simulation is carried out by changing the parameters of steel plate thickness, concrete strength, steel plate strength, axial compression ratio, shear span ratio and U-beam size (number of stiffener). The analysis results show that the load-displacement hysteretic curve of short-limbed steel tube bundles is full, and there is no obvious pinch-shrink phenomenon. The thickness and shear span ratio have a great influence on the bearing capacity of the members. The strength of concrete, The short-limb steel pipe bundles composite wall ductility is affected by the concrete strength, steel strength and axial compression ratio. When the axial compression ratio is increased above 0.5, the ductility of the short-legged composite wall decreases significantly.