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为研究纯扭作用下型钢混凝土梁的受力性能,设计6根型钢混凝土梁和1根钢筋混凝土梁进行了纯扭加载试验,考虑了型钢含钢率、型钢保护层厚度和配箍率3个变化参数。通过对试件破坏形态、扭矩-扭率曲线、开裂扭矩和极限扭矩等的分析,研究纯扭作用下型钢混凝土梁的性能退化及损伤演变过程,并分析了各变化参数对试件截面损伤演变的影响。研究结果表明:纯扭作用下型钢混凝土梁和钢筋混凝土梁均历经了线弹性、弹塑性和破坏三个阶段,钢筋混凝土梁表现为脆性破坏,型钢混凝土梁表现为延性破坏,且其极限扭矩和延性与钢筋混凝土梁相比有较大的提高;型钢的混凝土保护层厚度、型钢配钢率和配箍率对纯扭作用下构件的损伤演变有很大的影响,保护层厚度越小、型钢含钢率和配箍率越大,受扭构件的损伤度越小,在钢筋混凝土构件中配置型钢,能有效的抑制构件的损伤发展。
In order to study the mechanical behavior of SRC beams under pure torsional load, six SRC beams and one SRC beam were designed for pure torsion loading tests. The steel containing steel, the thickness of steel profile and the stirrup ratio were considered Change parameters. Through the analysis of failure modes, torque-torsion curve, cracking torque and ultimate torque, the performance degradation and damage evolution process of SRC beams under purely torsional moments were studied. The damage evolution of the SRC beams was analyzed. Impact. The results show that the SRC beams and RC beams all undergo three stages of linear elasticity, elasto-plasticity and failure. The RC beams exhibit brittle failure and the SRC beams show ductile failure. The ultimate torque and Ductility and reinforced concrete beam compared to a greater increase; profile steel concrete cover thickness, steel with steel and stirrup rate of pure torsional damage to the components under the evolution has a great impact, the smaller the thickness of the protective layer, steel The higher the steel ratio and the stirrup ratio, the smaller the degree of damage of the torsional member, the configuration of the section steel in the reinforced concrete member can effectively restrain the damage development of the member.