工字型钢混凝土偏心受拉构件正截面承载力计算  

Calculation for ultimate flexural capacity of eccentrically tensioned SRC members with embeded Ⅰ-shaped steel

作　　者：傅剑平[1] 陈茜[1] 张川[1] 唐锦蜀 赵仕兴[2] FU Jianping CHEN Xi ZHANG Chuan TANG Jinshu ZHAO Shixing(Key Laboratory of New Technology for Construction of Cities in Mountain Area （ Chongqing University）, Ministry of Education, Chongqing 400045, China Sichuan Provincial Architectural Design and Research Institute, Chengdu 610041, China)

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [2]四川省建筑设计研究院,四川成都610041

出　　处：《建筑结构学报》2017年第2期90-98,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51378519)

摘　　要：利用OpenSEES有限元程序,研究了轴拉比、型钢强度、纵筋强度、混凝土强度、型钢翼缘面积、型钢腹板厚度、型钢腹板高度、纵筋面积以及截面尺寸等因素对工字型钢混凝土偏心受拉构件正截面承载力的影响。结果表明:截面中型钢翼缘面积、型钢腹板高度、型钢腹板宽度、纵筋配筋率以及截面高度对偏拉构件正截面承载力的影响较大;型钢强度、纵筋强度对承载力的影响相对较小;混凝土强度、构件截面宽度对承载力基本没有影响。将JGJ 138—2012《组合结构设计规范》中型钢混凝土偏拉构件正截面承载力计算公式的计算结果与OpenSEES非线性有限元的计算结果进行了对比,提出了对规范公式的修正建议,并利用有限元模拟结果对修正后的计算公式进行了检验,二者吻合良好。The finite element program OpenSEES is used to investigate the effects of some parameters on the ultimate flexural capacity of eccentrically tensioned SRC members with Ⅰ-shaped steel. These paramaters are axial pre-tension level,yield strength of steel,yield strength of longitudinal reinforcement,compression strength of concrete,flange area of steel,web thickness of steel,cross-sectional area of longitudinal rebars and section dimension. The results of this parametric study show that the steel ＇s flange area,web height of steel,web thickness of steel,ratio of longitudinal reinforcement,and depth of section have greater effect on the ultimate flexural capacity of eccentrically tensioned SRC members than the strength of concrete and cross-sectional width. The effect of compression strength of concrete and width of section dimension can be ignored. Predictive equations available in the ‘Code for design of composite structure＇to compute the ultimate flexural capacity of eccentrically tensioned members with Ⅰ-shaped steel are evaluated using data from simulation results of OpenSEES. Based on the evaluation results and functional form of the predictive equations,alternative expressions to predict the ultimate flexural capacity of eccentrically tensioned SRC members is presented in the paper and verification of the expressions is conducted using simulation results. The results of verification show that there is a good agreement between the bearing capacity of expressions calculation and numerical simulation.

关 键 词：型钢混凝土偏拉构件 工字型钢 OPENSEES 参数分析 计算公式 正截面承载力 

分 类 号：TU398.7[建筑科学—结构工程] TU311.41