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通过7个冷弯薄壁型钢混凝土(CTSRC)剪力墙的拟静力水平往复试验,研究了其破坏过程和破坏模式,分析了混凝土强度、剪跨比、轴压比、水平分布筋和竖向型钢量等参数对其受剪性能的影响。试验结果表明:随着水平配筋率、轴压比和混凝土强度的增加受剪承载力提高;随着剪跨比提高,墙体受剪承载力降低;轴压比增加可提高墙体刚度,推迟墙体裂缝的出现,但不利于墙体延性;增加水平配筋可使墙体峰值后的承载力保持稳定。研究表明:CTSRC剪力墙与传统钢筋混凝土剪力墙的破坏特征和受力性能不同,在水平力作用下将出现沿冷弯薄壁型钢的竖向裂缝,经历整体墙到分缝墙的演变,避免了脆性剪切破坏。通过合理设计,CTSRC剪力墙可实现正常使用阶段有较高的刚度、峰值后有较好的延性、破坏时仍具有较高的竖向承载能力的目标。
Through the quasi-static horizontal reciprocating test of seven cold-formed thin-walled steel reinforced concrete (CTSRC) shear walls, the failure process and failure mode were studied. The effects of concrete strength, shear span ratio, axial compression ratio, The amount of steel and other parameters on the shear performance. The results show that the shear capacity increases with the increase of the horizontal reinforcement ratio, the axial compression ratio and the concrete strength. As the shear-span ratio increases, the shear strength of the wall decreases. The increase of the axial compression ratio can increase the stiffness of the wall, Postponed the emergence of wall cracks, but not conducive to the ductility of the wall; increase the horizontal reinforcement can make the bearing capacity of the wall after the peak stability. The results show that the failure characteristics and mechanical properties of CTSRC shear walls are different from those of traditional reinforced concrete shear walls. Under the action of horizontal force, the vertical cracks along the cold-formed thin-walled steel will appear and undergo the whole wall-to-wall evolution , To avoid brittle shear damage. Through reasonable design, CTSRC shear wall can achieve higher rigidity in normal use phase, better ductility after peak value and higher vertical bearing capacity when damaged.