【作者】 邓玉孙；

【导师】 戴国欣；

【作者基本信息】 重庆大学 ， 结构工程， 2002， 硕士

【摘要】 本文对国产轧制H型钢的性能进行了大量的分析，评估了GB50017对国产轧制H型钢的适用性，为推广应用国产轧制H型钢创造条件。逆算单元长度法是解决有初始缺陷梁的弹塑性弯扭屈曲问题行之有效的方法，笔者推导了理论计算公式。GB50017中扭转惯性矩的简化使规格大于HN350×175的HN型钢，在计算长度大于8米时，整体稳定系数偏高5％，绝对偏大量在0.01～0.03范围。GB50017与GBJ17－88的弹塑性修正简化式计算结果吻合得很好，前者计算的整体稳定系数比后者偏大不超过3.5％，GB50017的弹塑性简化式适用于国产轧制H型钢。GB50017梁的整体稳定系数公式的误差是由扭转惯性矩的简化造成。任何荷载情况和钢号，规格大于HN400×150的HN型钢，当计算长度大于8米时，整体稳定系数偏高约5％，绝对偏高量在0.01～0.04范围。GB50017计算轧制H型钢梁的整体稳定系数在弹性稳定范围是合适的，弹塑性稳定范围过于保守。弹塑性稳定范围，轧制梁比焊接梁大约多10％～20％的安全储备，且宽翼缘轧制H型钢的整体稳定性能高于窄翼缘轧制H型钢。 GB50017关于梁在等端弯矩作用下的整体稳定系数计算简化式对国产轧制H型钢过于保守。本文得出精度更高、适用范围更广的计算简化式。GB50017关于梁的整体稳定几何控制条件对国产轧制H型钢过于保守。本文提出轧制H型钢的几何控制条件，并建议将一般工字形截面简支梁和轧制H型钢梁分列处理。编制了等端弯矩作用下轧制H型钢梁式构件的整体稳定系数表，可供工程设计参考。更多还原

【Abstract】 The integral stability capacity for homemade rolled H-section steel beam and the applicability of the design code (GB50017) are analyzed entirely in the paper. It gives a chance to master and popularize homemade rolled H-section steel.The modified CDC method, proposed by Prof. Li-Kaixi, is effective to solve the problem on inelastic integral stability capacity for steel beam with initial distortion and residual stresses. According to the method, the algorithm is put forward in the paper.Taking account of the simplified torsion moment of inertia, integral stability coefficient increase relatively 5% or 0.01~0.03 absolutely, only for narrow rolled H-section (HN) behind HN350×175, whose calculation length goes beyond the limit of 8 meters.The discrepancy of inelastic stability modified equation between the GB50017 code and the GBJ17-88 code is wee. The former result is not more 103.5% than the latter. Concerning inelastic stability modified equation, the GB50017 code is appropriate.As a result of the simplified torsion moment of inertia, integral stability coefficients based on the GB50017 code increase relatively 5% or 0.01~0.04 absolutely, only for HN behind HN400×150, whose calculation length goes beyond the limit of 8 meters, taking account of any load condition and any yield-point.It is indicated that the result, based on the GB50017 code, is appropriate during the elastic integral stability range and is conservative excessively during the inelastic integral stability range, for homemade rolled H-section steel beam. Integral stability capacity of rolled beam is more 10%~20% than welded beam. At the same time, the inelastic integral stability capacity of wild rolled H-section (HW) steel beam is more superior observably than HN steel beam.Based on the GB50017 code, the geometry control condition of integral stability capacity of homemade rolled H-section steel beam is conservative excessively and is modified accordingly. The suggestion is put forward that adopting the different geometry control condition between rolled H-section steel beam and general I-section steel beam.Simplified formulary of integral stability coefficient is conservative excessively for homemade rolled H-section steel beam, based on the GB50017 code. In the paper, simplified formulary is modified cautiously, with more sufficient accuracy and extensive availability.WP=6>The practical table is compiled that integral stability coefficient of homemade rolled H-section steel beam under constant moment.更多还原