方套方复合钢管混凝土短柱压扭性能及延性分析
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TU398.9

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辽宁省教育厅(2017LNQN12)、辽宁科技大学人才引进(2017RC09)、辽宁省“兴辽英才计划”(XLYC1902009)


Compression-torsion Performance and Ductility Analysis of Composite Concrete Filled Steel Tubular Short Columns with Square Set Square Section
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    摘要:

    为了研究方套方复合钢管混凝土短柱的压扭力学性能以及在压扭情况下的抗震延性性能,以不同的轴压比和截面尺寸设计了12个试件进行试验分析,分别以不同的钢材强度、混凝土强度为参数进行数值模拟分析及对试验结果验证。结果表明;经过数据分析,试验结果和模拟结果基本吻合。在改变钢材强度情况下,抗扭极限承载力随着钢材强度的增强而增加。在改变混凝强度情况下,随着混凝土强度的增加抗扭极限承载力略有增加,且夹层混凝土延45o破坏。因混凝土剪切模量与强度有关,所以扭矩-转角曲线的弹性阶段斜率略微增加,也就是刚度有所增加。经过数据分析得出压扭情况下的抗震延性性能,在轴压比小于等于0.2情况下,随着轴压比增大位移延性系数先增大后减小。在轴压比大于0.2情况下,随着含钢率的增加试件的延性系数也随着增加,而小含钢率且延性系数小的试件容易发生脆性破坏。

    Abstract:

    In order to study the mechanical properties of compression and torsion and the seismic ductility under compression and torsion of the composite concrete filled steel tubular short columns with square set square sections , 12 specimens were designed and tested with different axial compression ratios and sectional sizes. Different steel strength and concrete strength are used as parameters for numerical simulation analysis and verify the test results. The results show that after data analysis, the test results and the simulation results are basically consistent. When the strength of the steel is changed, the torsional ultimate bearing capacity increases as the strength of the steel increases. In the case of changing the concrete strength, with the strength of concrete increases, the torsional ultimate bearing capacity increases slightly, and the failure of sandwich concrete exhibits 45o failure. Since the shear modulus of concrete is related to strength, the slope of the elastic phase of the torque-rotation angle (T-θ) curve increases slightly, that is, the stiffness increases. Through data analysis, it can be concluded that the seismic ductility performance under compression and torsion, with a small axial compression ratio 0.2, the displacement ductility coefficient increases first and then decreases as the axial compression ratio increases. In the case of large axial compression ratio 0.2, with the increase of the steel, the ductility of the test piece also increases, while the specimen with a small steel ratio and a small ductility coefficient is prone to brittle failure.

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陈全有,李吉人,赵阳,等. 方套方复合钢管混凝土短柱压扭性能及延性分析[J]. 科学技术与工程, 2021, 21(12): 5038-5045.
Chen Quanyou, Li Jiren, Zhao Yang, et al. Compression-torsion Performance and Ductility Analysis of Composite Concrete Filled Steel Tubular Short Columns with Square Set Square Section[J]. Science Technology and Engineering,2021,21(12):5038-5045.

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历史
  • 收稿日期:2020-08-12
  • 最后修改日期:2021-01-29
  • 录用日期:2020-12-20
  • 在线发布日期: 2021-05-17
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