Experimental study and numerical analysis on shear behavior of coral aggregate concrete beams with different types of steel bar
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摘要: 采用试验和数值分析相结合的方法，研究了不同种类钢筋珊瑚混凝土梁（Coral aggregate concrete beam，CACB）的抗剪性能，建立了适用于描述CACB抗剪性能的数值分析模型，明晰了CACB的抗剪性能变化规律。结果表明：钢筋种类对CACB的抗剪性能影响较大，由于普通钢筋极易锈蚀，而不锈钢筋和涂层钢筋能有效抑制钢筋发生锈蚀，因此，当CACB发生剪切破坏时，普通钢筋的应变值远大于有机新涂层钢筋；此外，考虑CACB在荷载作用下同时存在拉、剪、压等复杂应力，提出了基于K&C（Karagozian & Case）理论的CACB抗剪性能数值分析模型，验证了该模型在不同种类钢筋C60 CACB的适用性，发现该数值模型能较好地分析CACB的斜截面破坏全过程，以及挠度和抗剪承载力，其模拟精度较JGJ/T 12－2019和GB 50010－2020分别提高了63%和31%，表明该数值模型能有效表征CACB抗剪性能变化规律。Abstract: The shear behavior of CACB with different types of steel bar was studied by combining experimental and numerical analysis methods, and a numerical analysis model suitable for describing the shear performance of CACB was established, and the variation law of the shear performance of CACB was clarified. The results show that: the type of steel bar has a great influence on the shear performance of CACB, because ordinary steel bars are easy to rust, while stainless steel bars and coated steel bars can effectively inhibit the corrosion of steel bars. When the shear failure of CACB occurs, the strain of ordinary steel bars is higher than that of organic newly coated steel bars. In addition, a numerical analysis model of CACB shear performance based on K&C (Karagozian & Case) theory was proposed to verify the applicability of the model in different types of C60 CACB steel bars, considering that complex stresses such as tension, shear and compression existed simultaneously under load. It is found that the numerical model can well analyze the whole process of inclined section failure, deflection and shear capacity of CACB, and its simulation accuracy is 63% and 31% higher than that of JGJ/T 12-2019 and GB 50010-2020, respectively, indicating that the numerical model can effectively characterize the change law of shear performance of CACB.
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Keywords:
- coral aggregate concrete beam /
- types of steel bar /
- shear behavior /
- K&C theory /
- numerical analys
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