HRB500钢筋混凝土矩形截面弹塑性承载力的图算法  

Graphical algorithm for elastic-plastic bearing capacity of rectangular sections of HRB500 reinforced concrete

作　　者：兰树伟 陈旭 周东华[2] 毛德均 LAN Shuwei;CHEN Xu;ZHOU Donghua;MAO Dejun(College of Architecture and Civil Engineering,Kunming University,Kunming 650214,China;College of Architecture and Civil Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明学院建筑工程学院,云南昆明650214 [2]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《混凝土》2021年第12期11-15,共5页Concrete

基　　金：云南省教育厅项目(2021J0703);国家自然科学基金项目(51868034);云南省地方本科高校基础研究联合专项资金青年项目(2019FH001(-100))。

摘　　要：《混凝土结构设计规范》计算钢筋混凝土矩形截面承载力和配筋过程复杂且计算式繁多,采用等效矩形应力图简化会带来一定的误差,针对这些问题基于矩形截面应变变化规律推导了一种实用的计算方法。摒弃了等效应力图换算,通过分析极限承载力状态的应变变化区域,严格按混凝土和钢筋的本构关系的完整曲线进行推导,直接由混凝土和钢筋的应变求应力和内力,进而获得了精确的计算公式和图表,为工程设计提供一种简便实用的手算工具。计算偏心受力构件,无需判断大小偏心,计算十分方便和快捷,可适用于HRB500对称配筋的任意截面尺寸和C50以下混凝土强度等级。“Code for design of concrete structures”has a complicated process and many formulas for calculating the bearing capacity and reinforcement of the rectangular section of reinforced concrete.The use of equivalent rectangular stress diagrams to simplify will bring certain errors.In order to deal with these problems,a practical method is derived based on the law of strain changes in the rectangular section.The equivalent stress diagram conversion is discarded.By analyzing the strain change area of the ultimate bearing capacity state,it is deduced strictly according to the complete curve of the constitutive relationship between concrete and steel bar,and the stress and internal force are directly calculated from the strain of concrete and steel bar,and then precise calculation formulas and charts are obtained,which can provide a simple and practical hand calculation tool for engineering design.The method calculates eccentric force members without judging the type of large eccentricity or small eccentricity.The calculation is very convenient and fast,which can be suitable for any cross-sectional size of HRB500 symmetrical reinforcement and concrete strength levels below C50.

关 键 词：钢筋混凝土 应变区域 弹塑性 承载力 配筋 

分 类 号：TU528.01[建筑科学—建筑技术科学]