（1 中国十七冶集团有限公司技术中心，马鞍山 243000；2 安徽工业大学建筑工程学院，马鞍山 243032）

[摘要]  以广泛应用于学校、医院、住宅等建筑中的多龄期RC框架结构梁构件为研究对象，提出了基于有限元分析软件ABAQUS的适用于在役RC框架梁的数值建模方法，并鉴于RC框架梁主要用于承受竖向荷载并维持整体结构鲁棒性，建立了以抗弯刚度作为表征量的损伤表征函数。通过在未锈RC受弯构件抗弯刚度理论计算公式中引入以内嵌钢筋锈蚀率为自变量的粘结力修正函数，以反映钢筋锈蚀引起的材料间粘结性能退化行为，给出了锈蚀RC梁抗弯刚度的计算公式，计算分析了不同锈蚀状态下截面高度、混凝土强度等级、混凝土保护层厚度及配筋率等主要设计参数的损伤敏感度，揭示了梁构件主要设计参数对损伤演化的影响规律。研究成果将为建立地震激励下在役RC框架结构损伤模型提供提供理论和数据支持。

[关键词]  在役RC梁；损伤表征；抗弯刚度；粘结力修正函数；损伤敏感度

中图分类号：TU375.1，TU317+.1        文献标识码：A         文章编号：

Damage sensitivity analysis for main design parameters of RC beams

Hu Yi¹, Tao Qinglin²

(1Technology Center, China MCC17 group Co., Ltd., Maanshan 243000, China; 2 School of Civil & Architecture Engineering, Anhui University of Technology, Maanshan 243032, China)

Abstract: Taking the beam component of existing RC frame structure which is widely used in school, hospital and dwelling as research object, the method of numerical modeling for existing RC beam is offered based on finite element analysis software ABAQUS, and the damage evaluation function which regards bending rigidity as characteristic variable is established for role of RC beam in bearing vertical load and keeping structural robustness. By introducing the cohesive force correction function which takes reinforcement corrosion rate as independent variable into the theory calculating formula of flexural rigidity for RC flexural member with no corrosion to reflect the degeneration behavior of bond performance between materials which caused by reinforcement corrosion, the formulas for calculating flexural rigidity of corroded RC beam are proposed and the damage sensitivity of main design parameters, such as cross-section height, concrete strength, concrete cover thickness and reinforcement ratio, is analyzed, and then the influence law of design parameters on beam damage evolution is revealed. The achievements can provide theory and data support for establishing the damage model of existing RC frame structure under seismic excitation.

Keywords: existing RC beam; damage evaluation; flexural rigidity; bond force correction function; damage sensitivity