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为了研究配角钢骨架型钢混凝土梁的纯扭性能,设计了7个试件进行纯扭试验,考虑了型钢配钢形式、型钢保护层厚度和混凝土强度等级3个变化参数。通过试验观察了试件的破坏形态,获取了试件受力全过程曲线、开裂扭矩和极限扭矩等重要数据,并分析各变化参数对型钢混凝土梁抗扭性能的影响。试验结果表明:配角钢骨架型钢混凝土纯扭梁破坏时型钢受拉屈服、棱角处混凝土被压碎,具有良好的抗扭性能,适当增加型钢体积配钢率和混凝土强度等级均能有效提高型钢混凝土梁的开裂扭矩和极限扭矩,增加型钢保护层厚度则恰好相反。在试验的基础上,该文提出了配角钢骨架型钢混凝土梁的纯扭强度计算公式,其计算结果与试验实测结果基本吻合。研究结果可供型钢混凝土组合结构的进一步科学研究和工程应用参考。
In order to study the pure torsional behavior of the steel bar with counter-angle steel frame, seven specimens were designed for pure torsion test. Three parameters were considered, including the shape of steel distribution, the thickness of protective layer and the strength of concrete. The failure modes of the specimens were observed through experiments, and the important data such as the whole force curve, the cracking torque and the ultimate torque of the specimens were obtained. The influence of each parameter on the torsional resistance of the SRC beam was analyzed. The experimental results show that the section steel of the SRCB with Torsion beam is yielding under tension and the concrete at the corners is crushed and has good torsion resistance. Appropriately increasing the volume steel ratio of steel section and the concrete strength grade can effectively improve the strength of SRC Beam cracking torque and torque limit, increase the thickness of the protective layer steel is the opposite. Based on the experiment, the formula for calculating the pure torsional strength of steel-reinforced SRC beams is proposed. The calculation results are in good agreement with the experimental results. The results are available for further scientific research and engineering application of steel reinforced concrete composite structures.