冷弯薄壁C型钢-竹胶板组合墙体抗震性能试验

Experimental Study on Seismic Behavior of Cold-formed Thin-walled C Steel-bamboo Plywood Composite Walls

目的研究钢一竹组合墙体受力性能、破坏机理、抗震性能指标以及其承载力计算模型．方法组合墙体的骨架芯板为4根冷弯薄壁型钢，型钢翼缘用结构胶粘剂粘贴竹帘胶合板作为覆面板并用自攻螺钉固定，以竹胶板厚度、钢板厚度、c型钢翼缘、腹板尺寸等为参数，对6块组合墙体进行拟静力试验，观察各级荷载作用下型钢与竹胶板应变变化趋势，并依据弹性阶段组合墙体呈现的应力一应变关系及力的平衡关系等条件建立组合墙体承载力计算模型，并将其计算结果与试验结果进行对比分析．结果竹材覆面板的厚度对墙体刚度和承载能力影响不大，而芯部冷弯薄壁c型钢的厚度和截面参数对墙体承载力指标和抗震性能指标影响显著，组合墙体滞回曲线饱满，延性发展系数为1．33～1．54，承载能力试验值与计算值误差在10％左右．结论组合墙体组合效应突出，具有良好的延性和耗能能力，承载能力计算模型可靠．

The paper presents a kind of steel-bamboo plywood composite wail composed by gluing two pieces of bamboo plywood on the surface and four pieces of cold-formed thin-wailed C steel in the core and fixed by self-tapping screws. In order to investigate mechanical property of the composite walls including structural behavior, failure mechanism, seismic performance and carrying capacity calculation model, a quasi- static test of 6 composite walls is carried out. Considering thickness of the bamboo plywood and size of the flange and web of C steel, the test observes the strain change trend in the steel sheets and bamboo plates at different load levels, and carrying capacity calculation method is obtained based on the stress-strain relation- ship and force equilibrium relationship. The result shows that thickness changes of cladding bamboo plywood have little effect on stiffness and carrying capacity, but thickness and section parameters changes of cold- formed thin-walled C steel make very sharp effect on carrying capability and seismic performances. Seismic performance of bamboo-steel composite walls is excellent with 1.33 - 1.54 ductile development indexes. The deviation between experimental value and calculated value of the carrying capacity is about 10%. The two materials indicate very good composite effect and can provide good ductility and energy dissipation ca- pacity. The carrying capacity mode is calculable.