高强热轧钢筋混凝土连续梁弯矩调幅计算方法  

Moment modulation design method of reinforced concrete continuous beam with high-strength hot-rolled bar

作　　者：李玲[1] 王英[1] 郑文忠[1] 

机构地区：[1]结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨150090

出　　处：《哈尔滨工业大学学报》2015年第12期16-20,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51378146);国家教育部长江学者奖励计划资助项目(2009-37);教育部博士点基金资助项目(20132302110064)

摘　　要：为研究高强热轧钢筋混凝土连续梁弯矩调幅规律,对配置HRB335、HRB400、HRB500、HRB600热轧钢筋的392根混凝土连续梁进行非线性分析,分两阶段对弯矩调幅进行考察:一是从加载到支座控制截面纵筋受拉屈服引起的弯矩调幅βb;二是从支座控制截面形成塑性铰至受压区边缘混凝土被压碎引起的弯矩调幅βa.结果表明:高强热轧钢筋混凝土连续梁塑性铰出现推迟,塑性转动能力减小;同时从梁受拉边缘混凝土进入塑性至受拉钢筋屈服区间变长.获得了以支座控制截面相对塑性转角θp/h0为关键参数的具有一定截距βb的弯矩调幅系数曲线方程.为便于工程应用,建立以相对受压区高度ξ为自变量的实用化公式.392 two-span continuous beams which are used HRB335, HRB400, HRB500 and HRB600 reinforcements are analyzed to investigate the bending moment amplitude modulation rule of concrete continuous beam with high-strength hot-rolled bar. The moment redistribution is investigated in two phases： One is the modulation amplitude βb caused from loading to steel yielding in control section of support. The other is βa caused from formation of a plastic hinge to the crushing of compressive extreme concrete fiber in control section of support. The results indicate that the plastic hinge appears delay and the rotation capacity of plastic hinge decreases, at the same time, the interval from the tensile extreme concrete fiber into the plastic to longitudinal reinforcement yielding ranges longer. The moment amplitude modulation coefficient equation using θp/h0 as the key parameters with a certain intercept βb has been obtained. Practical expression with ξ as independent variable has been proposed to facilitate the engineering applications.

关 键 词：高强热轧钢筋 混凝土连续梁 非线性分析 弯矩调幅系数 

分 类 号：TU375[建筑科学—结构工程]