Experimental Study of Residual Stresses in Q550GJ High-strength Steel Welded H-type Sections
Experimental Study of Residual Stresses in Q550GJ High-strength Steel Welded H-type Sections
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发表时间：
2015
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通讯作者：
Qiu Lin-b;M. Grou
中科院分区：
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作者：
Qiu Lin-b;M. Grou
为促进高强度钢在钢结构中的应用，对Q550GJ高强度钢焊接H型钢的分布进行了研究。首先研究了Q550 GJ钢的力学性能。结果表明，该钢的屈服强度、抗拉强度和延伸率均符合现行规范。其成品率低于0。85.其次，设计制造了7根550GJ高强度焊接H型钢立柱。用分割法试验研究了这些柱的残余应力分布，并分析了不同参数对残余应力的影响。分析结果表明，腹板翼缘中部和焊缝区附近存在较大的残余拉应力，最大应力低于钢的屈服应力，且残余拉应力变化规律不明显。翼缘和腹板悬挑区域中部存在恒定的残余压应力，随着宽厚比的增大，残余压应力变小。柱的其他区域的残余应力由拉应力转移到压应力。
For promoting the application of high strength steel in steel structure,the distribution of Q550 GJ high-strength steel welded H-type sections was studied. The mechanical properties of Q550 GJ steel were researched firstly. The result shows that the yield strength,tensile strength and elongation of the steel are consistent with the present specification. And its yield ratio is lower than 0. 85. Secondly 7columns of 550 GJ high-strength steel with welding H-type sections were designed and manufactured. The distributions of the residual stresses in these columns were researched experimentally by the partition method,and the effects of the different parameters were analyzed. The analysis results show that there are bigger residual tensile stresses in the middle of the flanges and near the welded regions of the web,the biggest stress is lower than the yield stress of the steel,and the changes of the residual tensile stresses are irregular. There are constant residual compression stress in the middle of the overhanging regions of the flanges and the web,the residual compression stress become smaller as the increasing of the widththickness ratio. And the residual stresses of other regions of the column are transferred from the tensilestresses to the compression stresses.