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对人字形支撑进行弹塑性分析,变化支撑长细比和支撑倾斜角度,考虑四种不同的横梁加强程度。研究表明加强横梁可以延缓受压支撑屈曲后承载力的退化和作为受拉支撑的支点让其受拉屈服,使支撑架的极限承载力高于屈曲承载力。拟合了抗侧极限承载力和超强系数公式;分析发现,成对的中等长细比的人字支撑在达到抗侧极限承载力后有明显退化,因而抗震性能较差;提出了受压支撑屈曲后剩余承载力随层侧移角变化的公式,推导了受压支撑屈曲和受拉支撑屈服时的层侧移角公式,分析了横梁跨中承受的竖向不平衡力随层侧移角和支撑长细比的变化规律,提出了计算公式。
The herringbone support is elasto-plastic analyzed, the change of support slenderness and support tilt angle, consider four different degree of reinforcement of the beam. The results show that strengthening the beam can delay the buckling of the compression bearing and reduce the bearing capacity, and allow the tension bearing as the fulcrum of the tension support to make the ultimate bearing capacity higher than the buckling capacity. The ultimate bearing capacity and the super-strong coefficient formula are fitted. The analysis shows that the paired middle-thin-slender chevron brace has obvious degeneracy after it reaches the ultimate lateral bearing capacity and thus the seismic performance is poor. The formulas of lateral displacement of buckling and yielding of tension brace are deduced based on the formula of the change of remaining bearing capacity after buckling with the lateral displacement of the slab. The vertical unbalanced force Angle and support slenderness ratio variation, proposed calculation formula.