T形受压区混凝土应力模型系数的计算分析  

Calculation and analysis of stress model coefficient of concrete in T-shaped compression zone

作　　者：章胜平[1] 兰树伟 陈旭 ZHANG Shengping;LAN Shuwei;CHEN Xu(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650504,China;Construction Engineering College,Kunming University,Kunming 650214,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650504 [2]昆明学院建筑工程学院,云南昆明650214

出　　处：《混凝土》2023年第10期42-45,58,共5页Concrete

基　　金：国家自然科学基金(51868034);云南省教育厅科学研究基金(2021J0702,2021J0703)。

摘　　要：我国混凝土规范正截面承载力等效应力模型采用定值应力模型系数,未考虑截面几何特性和受力情况两个主要影响因素。在德国混凝土规范矩形截面等效应力模型系数解析解的基础上,按照极限状态所有可能的应变分布,考虑拉弯至压弯所有可能的受力,基于应力-应变本构方程,推导T形受压区应力模型系数解析解,补充了一种近似程度较少的电算方法。计算结果表明:纯弯至大偏心受压时,应力模型系数约为常量,但应考虑截面几何特性影响;翼缘相对宽度是影响应力模型系数的主要因素,力臂系数受影响程度约是应力系数的两倍。The stress model of normal section bearing capacity in China′s concrete code adopts the constant stress model coefficient,without considering the two main influencing factors of section geometric characteristics and stress conditions.On the basis of analytical solution of equivalent stress model coefficient of rectangular section in German concrete code,according to all possible strain distributions in limit state,considering all possible forces from tension bending to compression bending,and based on stress-strain constitutive equation,the analytical solution of stress model coefficient of T-shaped compression zone is derived,which supplements a less approximate computer calculation method.The calculation results show that the stress model coefficient is about constant when compressed from pure bending to large eccentricity,but the influence of section geometry characteristics should be considered.The relative width of flange is the main factor affecting the stress model coefficient,and the influence degree of the moment arm coefficient is about twice that of the stress coefficient.

关 键 词：预应力混凝土构件 T形受压区 承载力 解析法 应力系数 力臂系数 

分 类 号：TU528.01[建筑科学—建筑技术科学]