模块墙装配式建筑轻钢混凝土L型组合异形柱偏压力学性能研究

Study on eccentric compression mechanical properties of light steel concrete L-shaped composite special-shaped columns in modular wall prefabricated buildings

针对新型超低能耗模块墙装配式建筑中的轻钢混凝土L型组合异形柱偏压力学性能不明确等问题,本文对其进行了试验研究。结果表明:L型组合异形柱工作性能良好,主要发生受压侧混凝土开裂破坏,并伴有挠曲变形。建立了精细化有限元模型与试验结果进行对比,两者破坏特征与极限承载力吻合良好,验证了模型的正确性,在此基础上开展了变参数分析,研究了型钢厚度、混凝土强度、型钢强度、加载角以及长细比5个参数对L型组合异形柱偏压性能的影响,结果表明:试件偏压承载力随型钢厚度、混凝土强度以及型钢强度的增大而增大,随长细比增大而减小。加载角在0°~135°范围内时,试件偏压承载力随加载角增大而增大,加载角在135°~180°范围内时,偏压承载力随加载角增大而减小。

Aiming at the problem that the mechanical properties of light steel concrete L-shaped composite special-shaped column in the new ultra-low energy consumption modular wall prefabricated building under eccentric compression are not clear,this paper conducted experimental research on it.The results show that the L-shaped composite special-shaped column has good working performance,mainly cracking and failure of concrete on the compression side,accompanied by flexural deformation.The refined finite element model is established and compared with the experimental results.The failure characteristics of the two are in good agreement with the ultimate bearing capacity,which verified the correctness of the model.On this basis,the variable parameter analysis is carried out.The effects of five parameters,such as steel thickness,concrete strength,steel strength,loading angle and slenderness ratio,on the eccentric compression performance of L-shaped composite special-shaped columns are studied.The results show that the eccentric compression bearing capacity of the specimens increases with the increase of steel thickness,concrete strength and steel strength,and decreases with the increase of slenderness ratio.When the loading angle is in the range of 0°~135°,the bearing capacity of the specimen increases with the increase of the loading angle.When the loading angle is in the range of 135°~180°,the bearing capacity decreases with the increase of the loading angle.