Abstract：The multi-ribbed composite wall structure system is widely used in our country as a kind of energy-saving and shock-absorbing prefabricated building. However, the damage caused byfire reduces the performance of the building and seriously threatens the safety of human life and property. To analyze the performance of the multi-ribbed composite wall cell (MCWC) after high temperatures, MATLAB is used as the platform, the rigid framebar model of elastic-plastic damageis selected, the damage variables after high-temperatureof the subunits in the model are defined, and the local damage value of the wall cell after high temperatures is obtained using the MRCS-Tprogram. Based on the energy method and the local damage value, the general damage index is constructed and used to evaluate the damage. The damage state of MCWC after high temperatures is divided into five stages, and the damage limit value of each stage is given, which provides the basis for damage assessment of MCWC after high temperatures.
 YAO Q F, CHEN P, ZHANG Y, et al. Study on energy-saving residential system of multi-ribbed wall slab with light-weight outer frame[J]. Industrial Construction, 2003, 33(1):1-5. (in Chinese)姚谦峰, 陈平, 张荫, 等. 密肋壁板轻框结构节能住宅体系研究[J]. 工业建筑, 2003, 33(1):1-5.  ZHAO X L. Study on damage of multi-ribbed composite wall cell after high temperature[D]. Beijing:Beijing Jiaotong University, 2018. (in Chinese)赵秀丽, 高温后密肋复合墙体框格单元损伤研究[D]. 北京:北京交通大学, 2018.  FU C G, LIU W, KONG W Y, et al. The temperature field analysis of reinforced concrete beam based on heating and cooling whole curve[J]. Journal of Shandong Jianzhu University, 2015, 30(4):307-317. (in Chinese)傅传国, 刘玮, 孔唯一, 等. 基于升降温全曲线的钢筋混凝土梁温度场分析[J]. 山东建筑大学学报, 2015, 30(4):307-317.  DOS SANTOS J R, BRANCO F A, DE BRITO J. Assessment of concrete structures subjected to fire-the FBTest[J]. Magazine of Concrete Research, 2002, 54(3):203-208.  XIONG Y Q. Study on damage evolution rule and damage model of multi-ribbed composite wall[D]. Beijing:Beijing Jiaotong University, 2008. (in Chinese)熊耀清. 密肋复合墙体损伤演化规律及损伤模型研究[D]. 北京:北京交通大学, 2008.  CHANG P. Numerical analysis and seismic design of multi-ribbed slab structure based on performance (displacement)[D]. Beijing:Beijing Jiaotong University, 2006. (in Chinese)常鹏. 基于性能(位移)的密肋壁板结构数值计算分析与抗震设计方法研究[D]. 北京:北京交通大学, 2006.  ZHANG J. Study on residual bearing capacity of multi-ribbed composite wall cell after high temperature[D]. Beijing:Beijing Jiaotong University, 2016. (in Chinese)张敬. 高温后密肋复合墙体框格单元剩余承载力研究[D]. 北京:北京交通大学, 2016.  LV X L, LU W S. Application of fiber line element model in nonlinear analysis of frame structures[J]. Chinese Quarterly of Mechanics, 2006, 27(1):14-22. (in Chinese)吕西林, 卢文生. 纤维杆元模型在框架结构非线性分析中的应用[J]. 力学季刊, 2006, 27(1):14-22.  SUN B, NIU D T. Seismic performance evaluation for existing damaged structures based on capacity spectrum method[J]. World Earthquake Engineering, 2006, 22(1):10-14. (in Chinese)孙彬, 牛荻涛. 在役损伤结构基于能力谱方法的抗震性能评估[J]. 世界地震工程, 2006, 22(1):10-14.  QU Y Q, LIANG X W, TIAN Y. Evaluation of seismic damage performance based on energy analysis[J]. World Earthquake Engineering, 2006, 22(1):109-114. (in Chinese)瞿岳前, 梁兴文, 田野. 基于能量分析的地震损伤性能评估[J]. 世界地震工程, 2006, 22(1):109-114.  SHAIKHUTDINOV R, Structural damage evaluation:Theory and applications to earthquake engineering[D]. Pasadena, USA:California Institue of Technology, 2004.  FU J P, WANG M, BAI S L. Identification and modification of the Park-Ang criterion for failure of RC structures[J]. Earthquake Engineering and Engineering Vibration, 2005, 25(5):73-79. (in Chinese)傅剑平, 王敏, 白绍良. 对用于钢筋混凝土结构的Park-Ang双参数破坏准则的识别和修正[J]. 地震工程与工程振动, 2005, 25(5):73-79.  WANG Z Y, LIU J B. The advances of studies on seismic damage assessment of building structures[J]. World Information on Earthquake Engineering, 2001, 17(3):43-48. (in Chinese)王振宇, 刘晶波. 建筑结构地震损伤评估的研究进展[J]. 世界地震工程, 2001, 17(3):43-48.