温度场和应力场联合作用下钢筋混凝土柱力学性能研究*
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（北京工业大学建筑工程学院， 北京 100124）
［摘要］为了研究钢筋混凝土柱在不同温度场和应力场联合作用下的力学性能，采用ABAQUS软件对钢筋混凝土建立了相应的传热分析模型和热应力分析模型，模拟了不同高温、不同受火面的传热过程。在传热分析的基础上，研究温度场和应力场联合作用对钢筋混凝土柱损伤破坏以及端部反力影响。结果表明：试件表面温度模拟值与现场试验值吻合较好；不同升温过程中，试件内部温度梯度基本相同，温度从表面到内部依次降低；随着受火面的增加，相应面上的温度也在提高；当采用四面升温时，截面中心升温较为明显；当试件端部固接时，在温度场和应力场的联合作用下，试件端部反力下降，并且当其处于极限应力状态时，温度对其端部反力影响更为明显，当超过极限应力状态时，随着应力场和温度场的增加，试件的损伤程度不断增大，但损伤趋势变缓。［关键词］温度场; 应力场; 钢筋混凝土; 损伤破坏; 温度梯度中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2015)20-0069-06
Research on mechanical properties of reinforced concrete columns under combined effect of temperature fields and stress fieldsLiu Hongtao, Li Liang（College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China）Abstract: In order to study the mechanical properties of reinforced concrete columns under combined effect of different temperature fields and stress fields, the analytical models of heat transfer and thermal stress for reinforced concrete were developed using software ABAQUS to simulate the heat-transfer process of different sintering temperature and surfaces exposed to fire. Based on the heat transfer thermal analysis, the combined effects of different temperature fields and stress fields were studied on damage failures and end reaction forces of reinforced concrete columns. The result indicates that the simulation results of column surfaces temperature are in good accordance with experiment values. During different heating processes, the temperature gradients inside the specimen are almost the same and the temperature decreases gradually from the surface to the interior. The surface temperature increases accordingly as the increase of the number of surface exposed to fire. When the surrounding warming increases, the temperature of the section core significantly increases. The end reaction force of reinforced concrete column drops under combined effect of different temperature fields and stress fields, when boundary consolidation is applied. As the reinforced concrete is in the state of ultimate stress, the impaction of temperature on the reaction force is obvious significantly. When the stress state of reinforced concrete exceeds limit stress, the failure degree of the column increases with extension of the temperature fields and stress fields of reinforced concrete column, but the trend of damage degree slows down gradually.Keywords: temperature field; stress field; reinforced concrete; damage failure; temperature gradient
*北京工业大学研究生科技基金重点资助项目（ykj-2013-9952）。作者简介：刘洪涛，博士研究生，Email:liuht0312@163.com。
