基于正截面承载力及挠度控制的单筋矩形截面梁设计  

Design of single-reinforced rectangular beams based on cross section bearing capacity and deflection control

作　　者：徐壮 苏丽梅 张瑞刚 XU Zhuang;SU Limei;ZHANG Ruigang(River and Lake Protection and Construction and Operation Safety Center,Yangtze River Water Resources Commission,Wuhan 430014,China;Roads and Traffic Authority of Wansheng Economic&Technological Development Zone of Chongqing City,Chongqing 400800,China)

机构地区：[1]长江水利委员会河湖保护与建设运行安全中心,湖北武汉430014 [2]重庆市万盛经济技术开发区交通局,重庆400800

出　　处：《水利水电快报》2023年第1期59-63,共5页Express Water Resources & Hydropower Information

基　　金：国家自然科学基金项目(51408084)。

摘　　要：为精简单筋矩形截面梁的设计过程,在满足正截面承载力及挠度验算要求的基础上,推导出了当单筋矩形截面梁纵筋在经济配筋率ρ∈[0.6%,1.5%]时,用以确定梁截面高度的简化公式,进而确定了纵筋面积的直接设计方法。结果表明:该方法能主动控制截面混凝土受压区高度,保证梁的延性,不需再验算梁是否少筋或超筋。研究成果避免了繁琐的挠度验算过程,可为工程设计提供参考。In order to simplify the design process of single-reinforced rectangular beams,on the basis of satisfying the demands of cross section bearing capacity and deflection checking,a simplified formula to determine the section height of the beam was derived with the economic ratio of longitudinal reinforcement of single-reinforced rectangular beams within[0.6%,1.5%],and then the direct design method to calculate the area of longitudinal reinforcement was determined.The results showed that this method could actively control the depth of sectional compressive zone and could ensure the ductility of beam without checking whether the beam was under reinforced or over reinforced.This research result could avoid the complicated processes of deflection checking,which was a reference for engineering design.

关 键 词：矩形截面梁 正截面承载力 挠度 经济配筋率 配筋量 

分 类 号：TU375.1[建筑科学—结构工程]