巨型钢框架预应力复合支撑体系中复合支撑内力调平方法研究

为了消除巨型柱与支撑连接处的剪力突变,提高巨型柱的受力性能,提出了在竖向均布荷载和水平荷载作用下的复合支撑内力调平方法。以巨型钢框架预应力复合支撑体系为例,通过改变支撑预应力初始取值、支撑截面等参数来实现复合支撑水平方向内力的平衡,连接处巨型柱没有发生剪力突变,验证了调平方法的正确性。研究表明:在竖向均布对称荷载作用下,通过调节拉索初拉力可实现复合支撑内力调平;在反对称水平均布荷载和集中荷载作用下,通过改变拉索截面面积可实现复合支撑内力平衡。

Research on Method of Adjusting Internal Forces in the Composite Brace of the Mega Steel Frame and Prestressed Composite Brace Structure

In order to eliminate shear-mutations at the joint of mega column and support,and enhance its carrying capacity performance,the method of adjusting internal forces in the composite brace was proposed under vertical uniform distributed loads and dissymmetry horizontal loads.Taking the mega steel frame and prestressed composite brace structure(MFBS) as an example,through changed of the parameters,such as prestressing initial value and section of support,the balance of level direction internal force in the composite support is realized and the shear mutations do not happen at the joint in the mega column,which verifies the correctness of the leveling method.Research shows that mechanism of adjusting internal forces can be enforced by adjusting the cable’s initial prestress under the vertical uniform distributed loads,and can be enforced by changing the measurement of cable’s section under the dissymmetry horizontal loads.