巨型钢框架-拉索吊挂结构拉索参数确定方法

ESTIMATION OF CABLE’S PARAMETERS IN MEGA STEEL FRAME AND CABLE HANGING STRUCTURE

如何确定拉索参数是巨型钢框架--拉索吊挂结构的关键问题.基于简化模型推导了竖向载荷下结构内力及变形的求解方程;依据牛顿定律分析了水平载荷作用下,不同的滑移状态拉索对框架受力变形的影响,得到了拉索索力增量最大值的关系式;最终,根据"正常使用状态下,巨型梁的挠度满足规范要求"的拉索参数确定准则,建立了首先确定拉索截面积、再确定拉索预拉力的确定方法.为巨型钢框架-拉索吊挂结构的性能评判和初步设计奠定理论基础.

The determination of cable＇s parameters is one of key problems in mega steel frame and cable hanging structure. The equations for the internal force and deformation under vertical load are deduced based on a simplified model, then according to Newton＇s law, the influence of the gliding cable on the mechanical property and the structural deformation under horizontal load is analyzed, and the maximum internal force increment of the cables is obtained. At last, according to the rule that the deflection of a mega beam in a regular service meets the requirement of codes, the method of first determining the sectional area then the initial pre-stress is presented. This theory is useful for preliminary designs and the performance judgement for this new structure.