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通过1个交叉钢带支撑冷弯薄壁型钢骨架试件和2个交叉钢带支撑冷弯薄壁型钢骨架-喷涂轻质砂浆组合墙体试件的低周反复加载试验,研究分析了试件在受力过程中的破坏形态和受力性能。对试件的滞回曲线、骨架曲线、延性、抗侧刚度、刚度和承载力退化以及型钢构件的应变变化进行了研究,对比分析了交叉钢带支撑墙体和有连接较弱的斜撑墙体的抗剪性能差异。研究结果表明:交叉钢带支撑冷弯薄壁型钢骨架在循环荷载作用下仅受拉方向钢带具有抗侧能力,最终立柱发生整体弯扭屈曲,并伴随一定的局部屈曲。由于型钢骨架与两侧轻质砂浆之间的相互作用,组合墙体的承载能力和抗侧刚度显著提高,并具有良好的延性。外侧轻质砂浆约束了受压钢带的平面外变形,最终墙体边立柱底部发生局部屈曲,型钢骨架与两侧轻质砂浆之间出现滑移失效。交叉钢带支撑墙体的单位长度屈服承载力与斜撑墙体的相比,提高了15%~20%。
The low-cycle repeated loading test of cold-formed thin-wall steel frame-sprayed lightweight mortar composite wall with one cross-steel strip supported cold-formed thin-walled steel frame specimen and two cross-steel strip supported cold- In the process of stress damage form and stress performance. The hysteresis curve, the skeleton curve, the ductility, the lateral stiffness, the stiffness and the bearing capacity degradation of the specimens and the strain changes of the steel members were studied. The results of the analysis of the cross-steel strip supporting wall and the weakly connected diagonal wall Body shear resistance differences. The results show that the steel plate with cold-formed thin-walled steel beams supported by the cross-steel strip has lateral resistance in the tensile direction only under the cyclic loading, and the total post-column bending and torsion buckling occurs with a certain local buckling. Due to the interaction between the steel skeleton and the lightweight mortar on both sides, the bearing capacity and lateral rigidity of the composite wall are significantly improved and have good ductility. The outer lightweight mortar restrains the out-of-plane deformation of the steel strip, and finally the local buckling occurs at the bottom of the column. The slipping failure occurs between the steel skeleton and the lightweight mortar on both sides. The yield strength per unit length of the cross steel strip supporting wall is 15% ~ 20% higher than that of the slant wall.