论文部分内容阅读
全钢型分离式防屈曲支撑,在两端铰接时,两个内核构件独立伸出外围约束构件后端部通过肋板连接,形成较强的端部接头,由于这种端部构造以及内核之间有一定距离,内核与外围约束构件之间相关作用较复杂。鉴于传统的约束比限值计算公式不再适用,对其约束比取值进行了研究。考虑支撑整体几何初始缺陷的影响,依据其失稳机理将其侧向变形分解为正弦型变形和余弦型变形,分别计算两种变形下的跨中侧向变形,按计算所得比例组合得到实际的跨中侧向变形,所得的轴向荷载与跨中侧向变形曲线与有限元分析结果吻合较好。利用外围约束构件截面最大受弯承载力不小于考虑二阶效应跨中弯矩的控制条件,并在常见设计参数范围内进行有限元分析与拟合,得到实用的约束比限值计算式。有限元分析结果表明,该方法可用于预测分离式防屈曲支撑在静力单调轴压作用下的受力性能。
All-steel split anti-buckling support, hinged at both ends, the two independent core members out of the periphery of the restraint member rear end connected by ribs to form a strong end of the joint, the end of this structure and the core There is a distance between them, and the correlation between kernel and peripheral constraint components is more complicated. In view of the fact that the traditional formula of constraint ratio is no longer applicable, its constraint ratio is studied. Considering the influence of the initial geometric imperfections that support the overall geometry, the lateral deformation is decomposed into sine deformation and cosine deformation according to its instability mechanism, and the mid-span and lateral deformation under two deformations are calculated respectively. According to the calculated ratio, the actual Transverse lateral deformation, the resulting axial load and mid-span deformation curve and finite element analysis of the results are in good agreement. The maximum flexural capacity of the cross-section members with the external constraint is not less than the control condition considering the mid-span bending moment of the second-order effect, and the finite element analysis and fitting are carried out within the range of common design parameters. The results of finite element analysis show that this method can be used to predict the force performance of split buckling brace under static monotonic axial compression.