压弯剪扭作用下异形柱的抗扭性能研究

发布时间：2018-11-28 17:42

【摘要】：为研究复合受力下异形柱的抗扭性能,进行了一根L形柱、四根T形柱和一根十字形柱在压弯剪扭复合受力下抗扭性能的试验研究,分析了轴压比、扭剪比、截面形状对异形柱抗扭性能的影响情况。利用有限元软件建立了复合受力下异形柱抗扭性能的数值分析模型,建议了相应的模型分析参数。研究结果表明:在试验参数范围内,轴压比和扭剪比会提高T形柱的抗扭性能。轴压比为0.314的T形柱的极限扭矩和极限扭转角比轴压比为0.114的提高了203.8%和41.7%。扭剪比为1.34的T形柱的极限扭矩和极限扭转角比扭剪比为0.57的提高了62.9%和112.5%。截面形状对压弯剪扭复合受力下异形柱的开裂扭矩、极限扭矩的影响规律较复杂。建立的有限元模型能够较准确的模拟压弯剪扭作用下异形柱的开裂扭矩和极限扭矩。
[Abstract]:In order to study the torsional behavior of special-shaped columns under composite stress, an experimental study on the torsional properties of one L-shaped column, four T-shaped columns and one cross-shaped column under combined compression, bending, shear and torsional loading was carried out, and the axial compression ratio and torsional shear ratio were analyzed. The effect of section shape on torsion resistance of special-shaped columns. The numerical analysis model of torsional behavior of special-shaped columns under composite force is established by using finite element software, and the corresponding analysis parameters are suggested. The results show that the axial compression ratio and torsional shear ratio can improve the torsion resistance of T-shaped columns in the range of test parameters. The ultimate torque and the ultimate torsion angle of T-shaped column with axial compression ratio of 0.314 are 203.8% and 41.7% higher than that of 0.114. The ultimate torque and the ultimate torsional angle of T column with torsional shear ratio of 1.34 are 62.9% and 112.5% higher than that of 0.57. The influence of section shape on cracking torque and ultimate torque of special-shaped columns under compression, bending, shear and torsional loading is complicated. The finite element model can accurately simulate the cracking torque and ultimate torque of special-shaped columns under the action of compression, bending, shear and torsion.
【作者单位】：华侨大学土木工程学院;
【基金】：国家自然科学基金项目(50908091) 福建省自然科学基金面上项目(2012J01221) 福建省高等学校新世纪优秀人才支持计划项目(11FJRC03) 华侨大学中央高校基本科研业务费专项基金项目(JB-SJ1011)
【分类号】：TU375.3

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