混合设计的高性能钢梁抗弯性能试验

发布时间：2018-04-02 15:30

本文选题：高性能钢梁　切入点：混合设计　出处：《交通运输工程学报》2014年05期

【摘要】：采用两点加载的方式,对3片混合设计的高性能HPS 485W工字钢梁进行抗弯性能试验,分析了截面几何参数对试验梁抗弯承载力、弹塑性变形和破坏形态的影响。结合跨中单点加载的试验结果,对比分析了不同加载方式对试验梁抗弯承载力的影响,建立了能够准确模拟试验梁抗弯过程的有限元模型,在非厚实截面范围内对混合设计的高性能钢模型梁进行了关键参数的数值分析。分析结果表明:对两点加载的试验梁,抗弯破坏形态为纯弯段区出现受压翼缘与受压区腹板的局部屈曲;随着翼缘宽厚比的降低,钢梁的塑性转动能力明显提高;随着腹板高厚比的增加,钢梁的抗弯强度和延性均会降低;对相同几何尺寸的模型梁,加载方式改变时,钢梁的抗弯过程相似,但控制钢梁失效的破坏形态不同;对混合设计的钢梁,建议腹板与翼缘材料强度等级差不大于2个强度等级。
[Abstract]:The two-point loading method, the flexural performance test of 3 mixed design of high performance HPS 485W steel I-beam, analyzes the geometric parameters on the bearing capacity of the test beam, influence of elastic-plastic deformation and failure mode. Based on the test results of single point loading across the comparative analysis of the influence of different loading modes the bearing capacity of beam bending test, a finite element can accurately simulate the beam bending process model, numerical analysis in the range of high performance non thick section steel beam model of mixed design of key parameters. The results indicate: the test beam of two-point loading, bending failure modes for pure bending section of the local buckling of compressed flange and compressive web; with flange width to thickness ratio decreases, the steel plastic rotation capacity is obviously increased; with the web thickness ratio increases, the flexural strength and ductility of steel beams are When the loading mode is changed, the bending process of the steel beam is similar, but the failure modes of the steel beam failure are different. For the steel beam with mixed design, the strength grade difference between the web and flange material is not greater than 2 strength grades.

【作者单位】：长安大学陕西省公路桥梁与隧道重点实验室;
【基金】：教育部新世纪优秀人才支持计划项目(NCET-07-0121) 霍英东青年教师基金项目(101078) 交通运输部科技项目(2011 318 494 890)
【分类号】：U448.36

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