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《工程(英文)》 >> 2017年 第3卷 第6期 doi: 10.1016/j.eng.2017.11.005

部分包裹波形钢腹板组合梁的受力性能——剪切和弯曲的共同作用

a School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
b Department of Bridge Engineering, Tongji University, Shanghai 200092, China
c Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UK

发布日期: 2017-12-30

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摘要

提出部分包裹的混凝土和波形钢腹板组合梁(CGCSW)协同使用,以避免波形钢腹板和受压钢翼缘受到较大剪力和弯矩的共同作用发生屈曲。首先,我们对两种不同剪切跨度的试件进行了模型实验,以研究其受力性能,包括承载力、破坏模式、弯曲应力和剪切应力分布,以及混凝土开裂的过程。实验结果表明,剪力与弯矩的相互作用导致试件失效。当混凝土开裂前,弯剪比不影响组合梁在弹性阶段的剪切刚度,但对混凝土开裂后的剪切刚度影响较大。此外,弹性阶段的组合截面满足平截面假定。然而,在受拉区混凝土开裂后,由于“手风琴效应”,波形腹板的正应力变小,在平板段的应力几乎为零,但在倾斜的面板上具有较小的应力。其次,基于实验建立了考虑材料和几何非线性的三维有限元(FE)模型,并对不同长度和高度的组合梁进行了参数分析,以确定在组合荷载作用下的承载能力。最后,在实验和数值结果的基础上提出一个关于剪切和弯曲强度相互作用的公式,以评估这种组合结构的承载能力,从而为弯曲和剪切组合荷载作用下设计部分包裹波形钢腹板组合梁(PECGCSW)提供参考。

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