锈蚀钢筋混凝土梁承载能力分析的变角桁架模型  

Variable angle truss model for bearing capacity analysis of corroded reinforced concrete beams

作　　者：罗大明[1,2] 杨成雨 邢国华[3] 牛荻涛[1,2] LUO Daming;YANG Chengyu;XING Guohua;NIU Ditao(State Key Laboratory of Green Building in Western China,Xi'an University of Architecture and Technology, Xi'an 710055,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Civil Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]西安建筑科技大学省部共建西部绿色建筑国家重点实验室,陕西西安710055 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑结构学报》2019年第1期97-104,共8页Journal of Building Structures

基　　金：陕西省青年科技新星项目(2017KJXX-37);陕西省自然科学基础研究计划项目(2017JQ5103);中央高校基本科研业务费专项资金项目(300102288302);陕西省教育厅重点实验室科研计划项目(16JS056)

摘　　要：为了研究侵蚀环境下锈蚀钢筋混凝土梁在长期荷载作用下的承载能力,以荷载作用下锈蚀钢筋混凝土梁为研究对象,分析了钢筋锈蚀对混凝土梁黏结强度的影响,基于拉-压杆模型和标准桁架模型分别对锈蚀梁进行了承载力计算,进一步采用考虑钢筋锈蚀影响的修正变角桁架模型计算锈蚀钢筋混凝土梁的承载力,并通过49组锈蚀混凝土梁的试验数据对建议模型进行验证。结果表明:锈蚀钢筋混凝土梁承载力的试验值与变角桁架模型理论计算值之比的平均值为0.990,方差为0.071,二者吻合较好。采用变角桁架模型可精确计算锈蚀钢筋混凝土梁的承载力并预测其破坏模式,建议模型可用于锈蚀钢筋混凝土梁承载能力分析研究。In order to study the bearing capacity of corroded reinforced concrete beams under corrosive environment and long-term loads,the corroded reinforced concrete beams under sustained loads was taken as the research object, and the effects of steel corrosion on bond strength and failure mode were analyzed.Based on the strut-and-tie model and the standard truss model,the loading capacity of corroded reinforced concrete beams was calculated,and the beating capacity of concrete beams was then calculated by using the modified variable angle truss model considering the effect of steel corrosion.The proposed model was validated by the test data of 49 corroded concrete beams.The results show that,for the bearing capacity of the reinforced concrete beams,the calculated values are in good agreement with the test values,and the mean value and the variance of the ratio between the two are 0.990 and 0.071,respectively. The variable angle truss model can accurately calculate the bearing capacity of corroded reinforced concrete beams and predict their failure modes.The proposed model can be used to analyze the bearing capacity of corroded reinforced concrete beams.

关 键 词：锈蚀钢筋混凝土梁 拉-压杆模型 标准桁架模型 变角桁架模型 承载能力 

分 类 号：TU375.101[建筑科学—结构工程]