Warping Torsional and Distortional Stress of Composited Box Girder with Corrugated Steel Webs
Warping Torsional and Distortional Stress of Composited Box Girder with Corrugated Steel Webs
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波形钢腹板组合箱梁的翘曲扭扭应力
DOI：
10.1155/2018/7613231
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发表时间：
2018-01-01
影响因子：
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通讯作者：
Qin, Feng-jiang
中科院分区：
文献类型：
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作者：
Qiao, Peng;Di, Jin;Qin, Feng-jiang
波形钢腹板组合箱梁由于抗扭刚度较低，其抗扭性能较传统混凝土梁更为突出。本文对这种组合梁的扭转和畸变进行了研究。根据乌曼斯基第二理论，考虑波纹钢腹板的手风琴效应，提出了波纹钢腹板翘曲正应力和剪应力的计算公式。研究了不同尺寸参数对扭转应力和畸变应力的影响。结果表明，波形钢腹板组合箱梁各参数对应力的影响是不同的，且是隐式的。在偏心荷载作用下，这种梁的翘曲扭转应力和畸变应力不可忽略。与相应的对称荷载作用下的梁相比，总翘曲应力可能与弯曲正应力一样大，总剪应力通常达到弯曲剪应力的30%~ 50%。因此，建议在结构分析中采用本文提出的计算公式计算常规混凝土箱梁不考虑的翘曲应力和翘曲扭转变形引起的附加剪应力。
The torsional behaviors of composite box girders with corrugated steel webs are more obvious than traditional concrete girders due to the lower torsional rigidity. In this paper, the torsion and distortion of this kind of composite girder are studied. The formulas for warping normal stress and shear stress were put forward according to the second theory of Umanskii, considering the accordion effect of corrugated steel webs. Then, the influences of different dimensional parameters on the torsional and distortional stress are investigated. Results show that the effect of parameters on stress is different and implicit in composite box girders with corrugated steel webs. Under eccentric loads, the warping torsional and distortional stress in this kind of girder should not be neglected. Compared with girders under corresponding symmetric loads, the total warping stress may be as big as flexural normal stress, and the total shear stress usually reaches 30 to 50 percentage of flexural shear stress. So the warping stress and additional shear stress due to warping torsion and distortion are suggested to be calculated by the proposed equations in structural analysis, which are usually not taken into account in conventional concrete box girders.