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发布时间:2020-01-06 00:00:00
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房建材料及制品

界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究
界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究
  • 谈峰玲1,蒋宇杰2,*,周 浩2,汪 毅2
2024年第7期
摘要
引用本文
摘   要:为研究界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响,制作了3根钢筋混凝土梁对比试件,并进行了四点弯曲试验。同时,采用ABAQUS分析软件建立了非线性有限元模型,并进行了数值模拟分析。结果表明:当存在多个不连续缺陷时,试件上的CFRP提前发生剥离,剥离荷载下降了20.77%,导致试件的破坏模式发生改变,虽然极限荷载仅降低2.46%,但挠度降幅高达15.37%,延性下降显著;界面缺陷附近易产生应力集中,促使多裂缝均衡发展,导致裂缝间距减小;界面缺陷影响CFRP剥离起始发生位置,更易引起CFRP沿试件宽度方向贯穿剥离。 Abstract: In order to study the interface defects on the flexural behavior of RC beams strengthened with CFRP, 3 comparative specimens were made and four-point bending tests were conducted. At the same time, a nonlinear finite element model was established by using ABAQUS software, and the numerical analysis was conducted. The results show that when there are multiple interface defects in the specimens, the CFRP debonding occurs in advance and the debonding load decreases by 20.77%, which leads to a change in the failure mode of the specimens. Although the ultimate load decreases by only 2.46%, the deflection decreases by 15.37% and the ductility decreases significantly. Stress concentration is easy to occur near the interface defects, forming the balanced development of multiple cracks, resulting in the reduction of crack spacing. The interface defect affects the initial location of CFRP stripping, which is more likely to cause CFRP stripping along the width direction to form penetration.
谈峰玲,蒋宇杰,周浩,等.界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究[J].混凝土与水泥制品,2024(7):70-75. TAN F L,JIANG Y J,ZHOU H,et al.Study on the effect of interface defects on the flexural behavior of RC beams strengthened with CFRP[J].China Concrete and Cement Products,2024(7):70-75.
轴压荷载下装配式SCCT剪力墙钢板屈曲行为研究
轴压荷载下装配式SCCT剪力墙钢板屈曲行为研究
  • 庞 瑞,张 健*,王兴明,卫聪聪
2024年第7期
摘要
引用本文
摘  要:为探究装配式SCCT剪力墙钢板屈曲机制及钢板屈曲对墙体轴压承载性能的影响,建立了考虑钢材初始缺陷的装配式SCCT剪力墙非线性数值分析模型,对模型受力机理及钢板临界屈曲应力进行了分析,并根据参数分析结果提出了钢板临界屈曲应力计算方法。结果表明:墙体承载力主要由管内混凝土承担,各部件间协同工作,应力及变形传递性能良好;当管外混凝土厚度大于20 mm、钢材初始缺陷低于1/1 000时,二者对钢板临界屈曲应力影响可忽略不计;对于Q235和Q355常用钢,要求钢板不发生弹性屈曲的距厚比限值分别为44.9、36.6。 Abstract: In order to explore the buckling mechanism of steel plates in prefabricated SCCT shear walls and its impact on the axial compression bearing performance of the structure, nonlinear numerical analysis models of SCCT shear walls were established considering initial defects of steel plates. The force mechanism of the model and the critical buckling stress of the steel plate were analyzed, and a calculation method for the critical buckling stress of steel plates in SCCT shear walls was proposed based on parameter analysis. The results show that the bearing capacity of the wall is mainly borne by the concrete inside the steel tube, and the components of the wall work together, with good stress and deformation transmission performance. When the thickness of the concrete outside the steel tube is greater than 20 mm and the initial defect of the steel plate is less than 1/1 000, the influence of both on the critical buckling stress of the steel plate can be ignored. For commonly used steel Q235 and Q355, the distance-thickness ratio limits that require the steel plate to not undergo elastic buckling are 44.9 and 36.6 respectively.
庞瑞,张健,王兴明,等.轴压荷载下装配式SCCT剪力墙钢板屈曲行为研究[J].混凝土与水泥制品,2024(7):76-82. PANG R,ZHANG J,WANG X M,et al.Research on buckling behavior of steel plate in prefabricated SCCT shear wall underaxial compression load[J].China Concrete and Cement Products,2024(7):76-82.
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