基于規(guī)范的混凝土單軸循環(huán)本構(gòu)模型的開發(fā)
李 正, 朱炳寅
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(中國建筑設計研究院, 北京 100044)[摘要]將混凝土結(jié)構(gòu)設計規(guī)范（GB50010-2010）中建議的混凝土單軸應力—應變曲線作為骨架曲線與Yassin提出的滯回規(guī)則相結(jié)合，從而組成了一個能適用于鋼筋混凝土結(jié)構(gòu)在地震等反復荷載作用下非線性分析的循環(huán)本構(gòu)模型。以大型通用有限元軟件ABAQUS為分析平臺，通過軟件提供的用戶材料子程序二次開發(fā)接口VUMAT嵌入到ABAQUS中。驗證了模型在多種典型工況下的性能，并對一鋼筋混凝土四層平面框架結(jié)構(gòu)在地震作用下的損傷演化過程進行了模擬分析。結(jié)果表明：給出的混凝土單軸循環(huán)模型適用于鋼筋混凝土結(jié)構(gòu)的彈塑性地震響應分析。[關鍵詞] 鋼筋混凝土;纖維單元;單軸循環(huán)本構(gòu)模型;地震分析中圖分類號：TU313.3 文獻標識碼：A 文章編號:1002-848X(2013)S1-0726-05Development of uniaxial cyclic constitutive model for concrete based on Chinese Concrete CodeLi Zheng, Zhu Bingyin(China Architecture Design & Research Group, Beijing 100044, China)Abstract: The uniaxial envelope curves of concrete suggested in Chinese Concrete Code (GB50010-2010) are combined with the hysteretic rules by Yassin. The cyclic constitutive model for concrete is aimed at the nonlinear analysis of the reinforced concrete (RC) structures under strong earthquake. The model is implemented into general-purpose FEA software ABAQUS through the user material subroutine VUMAT. Then, some typical performances of the presented model are verified. And a seismic inelastic analysis of a multi-storey RC frame structure is conducted using the cyclic model as well. The results show that the constitutive model is suitable for the seismic analysis of RC structures.Keywords: reinforced concrete; fiber element; uniaxial cyclic constitutive model; seismic analysis
