采用“恒载零弯矩法”对大跨PC梁主梁配束的结果比较及方法优化  

Comparison and Method Optimization of the Matching Results of the"Constant Load Zero-bending Moment Method"in Large-span PC Beam Design

作　　者：张彦 赵玉川 ZHANG Yan;ZHAO Yuchuan

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《上海公路》2024年第2期45-49,87,I0010,I0011,共8页Shanghai Highways

摘　　要：“恒载零弯矩法”是以恒载状态下的主梁弯矩为零作为目标的配束方法,在大跨PC梁桥的设计中有一定范围的应用。“恒载零弯矩”是一种目标状态,但没有具体的方法。现通过“恒载零弯矩法”与常规配束方法的对比,比较了两者的预应力钢束指标与应力、挠度等效应的区别,并在此基础上,通过分析腹板束、顶板束的力学特征,提出了优化“恒载零弯矩法”的配束方法。The"constant load zero-bending moment method"is a matching method that aims at zero-bending moment of the main beam under constant load,and is widely used in the design of large-span PC girder bridges."Constant load zero-bending moment"is a target state,but there is no specific method.This paper compares the difference between the prestressed steel beam index and the stress,deflection and other effects of the prestressed steel beam by comparing the"constant load zero-bending moment method"with the conventional matching beam method.Building on this analysis,the study proposes an optimized prestressing strategy for the'constant load zero-bending moment method'by evaluating the mechanical properties of web and top flange strands.

关 键 词：恒载零弯矩法 徐变变形 腹板束 顶板束 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]