巨型钢框架-预应力拉索支撑结构施工过程分析

Structural Analysis of Constructing Process for Mega Frame and Cable Bracing Structure

主要分析了巨型钢框架-预应力拉索支撑结构在给定的施工方案下,整个施工过程中结构变形和内力的变化规律。结构的变形尤其是巨型梁跨中挠度在张拉拉索和吊装子结构时会发生突变;巨型柱的轴力在施工过程中会逐渐增大,弯矩和剪力则会受到拉索较大影响;巨型梁内力会受到上一大层拉索张拉和本大层吊装子结构较大影响。上述结论为此结构的施工设计和优化提供了理论指导。

This paper mainly presents structural deformation and internal force variation of mega frame- cable bracing structure throughout the construction process under given construction scheme. Structural deformation, especially for mega beam span deflection, has mutation when prestressed cables are being stretched and substructures are being lifted during the construction process. Mega column axial force gradually increases and moment as well as shear force is greatly influenced by the process of stretching prestressed cable. Internal force of mega beam is largely influenced by stretching pre-stressed cable of the upper large layer and lifting the substructure of the current large layer. The conclusion above can provide theoretic guidance for the design and optimum of the structural construction.