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基于混合设计的理念,采用中国产高性能钢HPS 485W和普通结构钢Q235,加工制造了6片混合设计工字形钢梁,在跨中单点加载,研究试验梁的抗弯承载能力、变形特征及最终的破坏形态。试验结果表明:腹板屈曲强度和试验梁侧向支撑刚度对试验梁的极限承载力、延性和失效形式有显著影响;试验梁的抗弯承载力主要由翼缘提供,但抗弯延性主要受腹板控制,承载力下降阶段受腹板屈曲强度影响显著;采用厚实截面设计的高性能钢梁可以达到全截面塑性,在有效的侧向限位下高性能钢梁具有很好的延性。试验结果与理论计算结果的对比表明,塑性弯矩理论计算结果与试验值吻合较好。
Based on the concept of hybrid design, six mixed-design I-shaped steel beams were machined with HPS 485W, a Chinese-made high-performance steel, and Q235. The single-point loading was adopted in the span to study the flexural capacity and deformation characteristics And the ultimate form of destruction. The experimental results show that the buckling strength of the web and the lateral support stiffness of the test beam have a significant effect on the ultimate bearing capacity, ductility and failure modes of the test beam. The flexural capacity of the test beam is mainly provided by the flange, but the flexural ductility is mainly affected by Web control and buckling strength of webs are significantly affected by the decreasing of bearing capacity. The full cross-section plasticity can be achieved by using high-performance steel beams with thick section design, and the high-performance steel beams have good ductility under effective lateral limit. The comparison between the experimental results and the theoretical ones shows that the calculated results of plastic bending moment are in good agreement with the experimental ones.