巨型钢框架复合支撑体系拉索直径确定方法

拉索直径的确定是巨型钢框架预应力复合支撑体系的关键问题之一。通过分析水平荷载下预应力复合支撑的力学机理，找出了拉索直径的决定因素，基于此提出其取值准则，并通过理论推导最终建立拉索直径的确定方法，进一步通过基于工程实际的数值算例进行了验证。反对称荷载下的不平衡，只能采用反对称手段调平，巨型钢框架预应力复合支撑体系拉索直径由水平荷裁决定，以复合支撑内力平衡为取值准则。建立的影响系数迭代调平方法确定拉索直径能够考虑上下层之间的相互影响，具有良好的精度和可操作性。

Determination Method on Diameter of Cables in Mega Steel Frame and Composite Brace Structure

How to determine the diameter of cables is one of key problems in mega steel frame and pre- stressed composite brace structure. Firstly, through analysis of work mechanism of composite brace under horizontal load, the deciding factor of diameter value was found, and furthermore its rule was proposed. Finally, the determination equations were acquired through theoretic deduction and were proved with numerical example. The results indicate that the unbalance in composite brace resulted from antisymmetric load can be eliminated only by antisymmetric way. Thus the diameter value is decided only by antisymmetric horizontal load, and its rule is to keep the balance of composite brace under horizontal load. The influencing factor iterative leveling method can consider the influence from upper and lower floor, and is relatively accurate and feasible.