不同厚度轻钢桁架轻混凝土组合墙板轴压性能研究
董宏英 , 李浩东 , 杨兆源 , 曹万林 , 徐涛 , 沈韦霞
建筑钢结构进展 ›› 2025, Vol. 27 ›› Issue (07) : 44 -53.
不同厚度轻钢桁架轻混凝土组合墙板轴压性能研究
Research on Axial Compressive Performance of Lightweight Steel Truss and Lightweight Concrete Composite Wall Panels in Different Thicknesses
为研究轻钢桁架轻混凝土组合墙板的轴压性能,设计了1个轻钢桁架足尺试件和2个轻钢桁架轻混凝土组合墙板足尺试件,并对其进行了轴压性能试验,分析了不同轻混凝土厚度对试件破坏特征、荷载-位移曲线、轴压承载力等的影响。还通过有限元模型进行了数值模拟,阐明了轻钢桁架轻混凝土组合墙板轴压损伤的演化过程,揭示了其屈服机制。研究表明:轻钢桁架轻混凝土组合墙板的破坏形态主要为轻钢立柱局部变形屈曲和轻混凝土局部压溃破坏;90 mm厚无面层和150 mm厚有面层组合墙板的峰值承载力较轻钢桁架试件的峰值承载力分别提高了65.2%和361.7%;在轴压荷载作用下轻钢骨架与轻混凝土的协同工作性能较好,轻混凝土在为墙板提供竖向承载力的同时,通过对轻钢龙骨形成有效约束显著提升了其受压稳定性;数值模拟结果与试验结果吻合较好,基于参数分析对轻钢桁架轻混凝土组合墙板开展了优化设计,相关成果可为工程设计提供参考。
In order to investigate the axial compressive performance of lightweight steel truss and lightweight concrete composite wall panels, one lightweight steel truss and two lightweight steel truss and lightweight concrete composite wall panel specimens in full size were designed and tested for axial compressive performance, and the effects of different lightweight concrete thicknesses on the failure modes, load-displacement curves, and axial compressive bearing capacity of the specimens were analyzed. Finite element models were established and numerical simulations were carried out to elucidate the axial compressive damage evolution process of lightweight steel truss and lightweight concrete composite wall panels and reveal the yielding mechanism. The results show that the failure modes of lightweight steel truss and lightweight concrete composite wall panel mainly consist of local deformation and buckling of lightweight steel columns and local compression crushing of lightweight concrete. The peak bearing capacity of 90mm-thick wall panel without facing layer and 150mm-thick wall panel with facing layer is increased by 65.2% and 361.7% respectively compared with that of lightweight steel truss specimen. Under the action of axial compressive load, the lightweight steel skeleton and lightweight concrete work well together, and the lightweight concrete provides vertical bearing capacity for the wall panel while the constraint effect on the lightweight steel keel effectively improves its compressive stability. The numerical simulation results conform to the experimental results well, and the structural configuration of lightweight steel truss and lightweight concrete composite wall panel is optimized through parametric analysis, which can provide reference for engineering design.
轻钢桁架 / 轻混凝土 / 组合墙板 / 轴压试验 / 数值模拟 / 参数分析
lightweight steel truss / lightweight concrete / composite wall panel / axial compressive test / numerical simulation / parametric analysis
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国家自然科学基金(52378116)
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