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首页> 美国卫生研究院文献>Materials >Part I: The Analytical Model Predicting Post-Yield Behavior of Concrete-Encased Steel Beams Considering Various Confinement Effects by Transverse Reinforcements and Steels
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Part I: The Analytical Model Predicting Post-Yield Behavior of Concrete-Encased Steel Beams Considering Various Confinement Effects by Transverse Reinforcements and Steels

机译：第一部分：考虑横向约束和钢的各种约束效应的混凝土包裹钢梁屈服后行为的分析模型

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The purpose of the work was to propose analytical model considering double confinements (provided by both transverse reinforcements and a wide flange steel section), which was verified by the nonlinear finite element analysis considering concrete-damaged plasticity. The scope of the effort and the procedures to achieve the aim of this study included the identification of the concrete confinements provided by both transverse reinforcements and a wide flange steel section based on the elasto-plastic model in tension for both rebar/steel sections and elasto-buckling for rebars in compression. The influence of rebar buckling in the compression zone on flexural moment strength was also investigated with and without considering confining effects offered by steel sections. The analytical approach predicted a post-yield behavior of composite beams based on the confining effect offered by both the shear reinforcement and wide steel flange sections. However, for beams without axial loads, the compressive zones with high and partial confinements for concrete sections at the yield and maximum load limit state were limited when compressive buckling failure was not considered, preventing the confining factors from significantly influencing the flexural load resisting capacity. An accurate flexural capacity of composite beams can be obtained when rebar was modeled with buckling in the compression zone.
机译：这项工作的目的是提出一个考虑双重约束的分析模型（由横向钢筋和宽翼缘钢截面共同提供），并通过考虑混凝土受损塑性的非线性有限元分析加以验证。为达到本研究目的而进行的工作范围和程序包括：基于钢筋/钢截面和弹性体拉伸的弹塑性模型，确定由横向钢筋和宽翼缘钢截面提供的混凝土约束。 -屈曲压缩钢筋。在考虑和不考虑钢型材提供的约束效应的情况下，还研究了压缩区内钢筋的屈曲对弯矩强度的影响。该分析方法基于抗剪钢筋和宽钢翼缘截面所提供的约束效应，预测了复合梁的屈服后性能。然而，对于没有轴向载荷的梁，当不考虑压缩屈曲破坏时，在屈服和最大载荷极限状态下，混凝土截面具有高和部分约束的压缩区域受到限制，从而阻止了约束因素显着影响抗弯承载能力。当钢筋在压缩区中通过屈曲建模时，可以获得精确的复合梁抗弯能力。

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