溫度場和應力場聯(lián)合作用下鋼筋混凝土柱力學性能研究*
劉洪濤，李亮
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（北京工業(yè)大學建筑工程學院， 北京 100124）
［摘要］為了研究鋼筋混凝土柱在不同溫度場和應力場聯(lián)合作用下的力學性能，采用ABAQUS軟件對鋼筋混凝土建立了相應的傳熱分析模型和熱應力分析模型，模擬了不同高溫、不同受火面的傳熱過程。在傳熱分析的基礎(chǔ)上，研究溫度場和應力場聯(lián)合作用對鋼筋混凝土柱損傷破壞以及端部反力影響。結(jié)果表明：試件表面溫度模擬值與現(xiàn)場試驗值吻合較好；不同升溫過程中，試件內(nèi)部溫度梯度基本相同，溫度從表面到內(nèi)部依次降低；隨著受火面的增加，相應面上的溫度也在提高；當采用四面升溫時，截面中心升溫較為明顯；當試件端部固接時，在溫度場和應力場的聯(lián)合作用下，試件端部反力下降，并且當其處于極限應力狀態(tài)時，溫度對其端部反力影響更為明顯，當超過極限應力狀態(tài)時，隨著應力場和溫度場的增加，試件的損傷程度不斷增大，但損傷趨勢變緩。［關(guān)鍵詞］溫度場; 應力場; 鋼筋混凝土; 損傷破壞; 溫度梯度中圖分類號：TU375 文獻標識碼：A 文章編號：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
*北京工業(yè)大學研究生科技基金重點資助項目（ykj-2013-9952）。作者簡介：劉洪濤，博士研究生，Email:liuht0312@163.com。
