A new method for rapidly capturing the strength and full nonlinear response of partially interacting steel–concrete composite beams

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES Composites Part C Open Access Pub Date : 2024-05-03 DOI:10.1016/j.jcomc.2024.100467
Marco Lamberti , Ghani Razaqpur
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Abstract

A semi-analytical procedure is presented for predicting the complete flexural response of partially interacting steel–concrete composite beams up to failure. The governing equation of the Euler–Bernoulli beam theory is solved wherein concrete, steel and the shear connectors joining the concrete slab to the steel beam are assumed to have nonlinear stress-deformation relationships. The adopted constitutive relationship for the connectors allows for partial or full composite action. The solution is applicable to beams and one-way slabs subjected to concentrated or uniform load and/or their combination. The governing equation is numerically solved by satisfying the equilibrium and compatibility requirements along the member. For the reinforced concrete part of the composite beam, a nonlinear moment–curvature relationship is developed that accounts for concrete nonlinearity in compression and for cracking and tension-stiffening in tension as well as for steel reinforcement nonlinearity. The steel profile is assumed to have a bilinear elasto–plastic strain-hardening moment–curvature relationship. Comparison of the proposed model results with the corresponding experimental load–deflection curves and interfacial shear–slip curves of several beams tested by others shows good agreement. The relative simplicity, efficiency and easy application of the present solution make it possible to accurately predict the failure load, interfacial slip and full nonlinear response of partially interacting composite beams.

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快速捕捉部分相互作用钢-混凝土复合梁强度和全非线性响应的新方法
本文提出了一种半分析程序,用于预测部分相互作用的钢-混凝土复合梁直至破坏的全部弯曲响应。解决了欧拉-伯努利梁理论的控制方程,其中假定混凝土、钢和连接混凝土板与钢梁的剪力连接件具有非线性应力-变形关系。采用的连接件构造关系允许部分或全部复合作用。该解决方案适用于承受集中荷载或均匀荷载和/或两者组合的梁和单向板。通过满足沿构件的平衡和兼容性要求,可以对控制方程进行数值求解。对于复合梁的钢筋混凝土部分,建立了非线性弯矩-曲率关系,考虑了混凝土受压时的非线性、受拉时的开裂和拉伸-刚度以及钢筋的非线性。假定钢筋具有双线性弹塑性应变硬化弯矩-曲率关系。将提出的模型结果与他人测试的几种梁的相应实验荷载-挠度曲线和界面剪切-滑移曲线进行比较,结果显示两者吻合良好。本解决方案相对简单、高效且易于应用,因此可以准确预测部分相互作用复合梁的破坏荷载、界面滑移和全非线性响应。
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来源期刊
Composites Part C Open Access
Composites Part C Open Access Engineering-Mechanical Engineering
CiteScore
8.60
自引率
2.40%
发文量
96
审稿时长
55 days
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