李红明^1,2，  顾  盛¹
    （1 江苏科技大学土木工程与建筑学院，镇江212003；2同济大学土木工程学院，上海200092）

[摘要] 巨型钢框架预应力复合支撑体系中刚性支撑与柔性拉索组合形成刚柔兼济的复合支撑系统，能缓解巨型桁架节点受力集中、提高巨型框架的抗侧刚度，同时也将巨型梁竖向荷载以轴力形式通过巨型柱传递至基础。通过论述该体系复合支撑内力在竖向均布荷载作用下的调平机理，得出了通过调节拉索初拉力实现复合支撑内力调平的结论。
[关键词] 预应力；钢结构；巨型结构；复合支撑；初拉力；内力调平
中图分类号：TU393.2    文献标识码：A  文章编号：1002-848X(2011) S2-0111-03

Mecharusm of adjusting internal force about composite brace in vertical uniformly distributed load
    Li Hongming^1,2,  Gu Sheng¹
    (1 Civil Engineering Department, Jiangsu University of Science and Technology, Zhenjiang 212003, China; 2 Civil Engineering Department, Tongji University, Shanghai 200092, China)

Abstract: The composite brace in mega steel frame and pre-stressed composite brace structure, composed with rigid brace and flexibility cable, can alleviate mega truss stress concentration and improve the lateral stiffness of the mega frame, and it can transfer the vertical load in mega beam to base in the axial force, by way of mega column. The mecluuusm of adjusting intemal force about composite brace action in vertical uniformly distributed load was discussed. It is concluded that in vertical ruuformly distributed load, mechfuusm of adjusting intemal force can be enforced by adjusting the uutial prestress in the cable.
Keywords: prestress; steel structure; mega structure; composite brace; initial prestress; internal force adjusting