内翻U形外包钢组合梁正截面抗弯承载力分析
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TU398

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国家自然科学基金(51878663)


Analysis of normal section bending bearing capacity of inverted U-Shaped steel-encased concrete composite beam
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    摘要:

    为研究新型内翻U形外包钢混凝土组合梁正截面抗弯承载力及其构造要求,以已有内翻U型外包钢混凝土组合连续试验梁为参照,建立该组合连续梁非线性有限元模型,模拟组合连续梁有限元模型的荷载跨中挠度曲线,并与相关试验结果对比,验证了该组合梁有限元模型的建模方法和参数选取的合理性与有效性。应用建立的组合连续梁有限元模型,分析了内翻外包钢混凝土组合梁正截面抗弯承载力的主要影响参数。综合内翻U型外包钢混凝土组合连续梁正截面抗弯承载力试验和模拟结果,提出采用简化塑性理论计算组合梁正截面抗弯承载力计算时,组合梁正截面抗弯承载力塑性理论计算值应乘0.96的修正系数。0.96倍组合梁正截面抗弯承载力塑性理论计算值与组合梁有限元模型模拟计算值相比较,发现二者十分接近,偏于安全,提出的组合梁正截面抗弯承载力修正简化塑性理论计算值具有足够的准确性和可靠性。

    Abstract:

    In order to study the normal section bearing capacity and the formation requirements of a novel inverted U-shaped steel-encased concrete composite beam, the nonlinear finite element models of the composite continuous beams have been established based on the existing U-shaped steel-encased concrete composite continuous beams. The load-deflection curve at mid-span of the composite continuous beam finite element model was plotted, and compared with other test results. It proves the rationality and effectiveness of the modeling method and parameter selection of the composite beam finite element models. Using the established finite element model of composite continuous beams, the main influential parameters of normal section bearing capacity of the inverted steel-encased concrete composite beams are analyzed. Based on the test and simulation results of normal section bearing capacity of inverted U-shaped steel-encased concrete composite continuous beams, it is proposed that when the normal section bearing capacity of the composite beam is calculated by the simplified plastic theory, the plastic theoretical calculation value of the normal section bearing capacity of the composite beam should be multiplied by a correction factor of 0.96. Comparing the calculated value of 0.96 times the plastic theoretical calculation value of the normal section bending capacity of the composite beam with the calculated value of the finite element model of the composite beam, the two values are found very close in safe side. The proposed modified simplified plastic theory calculation value of the normal section bending capacity of the composite beam is accurate and reliable enough.

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阎奇武,张正.内翻U形外包钢组合梁正截面抗弯承载力分析[J].土木与环境工程学报(中英文),2020,42(6):81-94.

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  • 收稿日期:2019-12-11
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  • 在线发布日期: 2020-11-26
  • 出版日期: 2020-12-31