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腹板开孔卷边槽钢梁(LCB)普遍用在建筑结构的楼板格栅和托梁上。这些腹板开孔卷边槽钢梁的抗剪性能很复杂,且它们的抗剪承载力由于腹板开孔而大大降低。然而,对于腹板开孔卷边槽钢梁抗剪性能的研究很有限。因此,采用详细的数值分析研究非加劲的腹板圆形开孔卷边槽钢梁的抗剪性能和强度。建立一个跨中荷载下长宽比分别为1.0和1.5的卷边槽钢梁的有限元模型,并通过比较它们的试验结果验证这个模型的有效性。在详细的参数研究中使用这个模型,从而研究各种影响因素的影响。试验和数值结果显示,当前的冷弯薄壁型钢设计规范中的设计方法过于保守。因此,根据试验和数值结果,提出一个改进的腹板开孔卷边槽钢梁抗剪强度的设计公式。详细介绍这个非加劲的腹板圆形开孔卷边槽钢梁的有限元模型,并通过验证,进一步改进抗剪设计方法。所提出的抗剪设计方法有望纳入未来版本的冷弯型钢设计规范。
Web openings Curved channel girders (LCB) are commonly used on floor grilles and joists of building structures. The shearing behavior of these webs with open-ended curled channel beams is complex and their shear capacity is significantly reduced due to web openings. However, the research on the shear properties of steel beams with web openings curled channel is limited. Therefore, a detailed numerical analysis is conducted to study the shear resistance and strength of a non-stiffened circular web with round holes. A finite element model of curled channel steel beams with aspect ratio of 1.0 and 1.5 respectively under mid-span load is established. The validity of this model is verified by comparing their experimental results. Use this model in detailed parametric studies to study the effects of various influencing factors. The experimental and numerical results show that the design method in the current cold-formed thin-wall steel design code is too conservative. Therefore, based on the experimental results and the numerical results, an improved design formula of the shear strength of the steel beam with open webs is proposed. This paper introduces the finite element model of the non-stiffened web circular hole with curled channel and verifies it to further improve the method of shear resistance design. The proposed shear design method is expected to be included in the future version of the cold-formed steel design specifications.