基于截面分类的U形钢-混凝土组合梁外包钢板件宽厚比限值
CSTR:
作者单位:

重庆大学

基金项目:

国家重点研发计划(2016YFC0701506)


Study on the section-classification-based steel plate width-thickness ratio of Steel-Concrete Composite Beam with U-section
Affiliation:

Chongqing University

Fund Project:

National Key R & D Program (No. 2016YFC0701506)

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    摘要:

    为研究U形钢组合梁基于截面分类的外包钢板件宽厚比限值,对5根U形钢组合梁试件进行单调静力加载试验。分析了不同外包钢腹板受压区高厚比及受压翼缘宽厚比情况下,U形钢组合梁的破坏模式、荷载-位移曲线及塑性变形能力。试验结果表明,外包钢板件宽厚比对U形钢组合梁的屈曲变形和塑性变形能力有着直接影响,所有试件在达到峰值承载力前均发生了局部屈曲,破坏模式为弯曲塑性破坏。同时,通过有限元参数分析结果表明,外包钢腹板与受压翼缘之间的非线性行为相互影响,板件的屈曲时刻随着相邻板件宽厚比的增大而提前,增大外包钢板件宽厚比会降低U形钢组合梁的塑性发展程度。基于试验与有限元参数分析结果,提出了U形钢组合梁的Ⅱ类截面(Class 2)外包钢板件宽厚比限值建议,并将该限值与规范限值进行对比分析。

    Abstract:

    In order to study the plate width-thickness ratio limits of steel palte based on section classification for Steel-Concrete Composite Beam with U-section (SCBU), monotonic static loading tests were conducted on five SCBU specimens. The damage modes, load-displacement curves and plastic deformation capacities of SCBU with different combinations of height-thickness ratios of outer steel-encased web in compression area and width-thickness ratios of compressed flange were analyzed. The test results show that the width-thickness ratio of the steel plate has a direct influence on the buckling deformation and plastic deformation capacity of the SCBU. All the specimens suffered local buckling before reaching the peak bearing capacity, the failure mode was bending plastic damage. Meanwhile, the finite element analysis results show that the nonlinear behavior between the steel plate web and compressed flange interacts with each other, the buckling moment of the plate advances with the increase of width-thickness ratio of the adjacent plate, and the degree of plastic development of the SCBU decreases with the increase of width-thickness ratio of steel plate. Based on the results of the test and finite element parametric analysis, the recommended limit value of width-thickness ratio for class II section (Class 2) steel palte of SCBU is proposed and compared with the code limit values.

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  • 收稿日期:2023-03-16
  • 最后修改日期:2023-05-20
  • 录用日期:2023-05-22
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