高温作用后不等肢L形截面型钢混凝土柱偏心受压性能试验研究
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摘要
对8根不等肢L形截面型钢混凝土柱进行高温作用后的受力性能试验研究,1根未受火柱作为对比试件。柱配钢形式为桁架式配钢,试验中考虑加载角与加载偏心距的影响。通过试验,获得试件破坏形态以及承载力、截面平均应变分布、荷载-滑移曲线和截面变形特性。研究结果表明:柱肢内侧两面受火1 h的不等肢L形截面型钢混凝土柱仍然具有较高的竖向承载能力;空腹式配钢与合理的腹杆布置能够保证型钢与混凝土的协同工作,应变平截面假定仍然适用;不等肢L形截面型钢混凝土柱长肢方向的截面弯曲刚度较短肢的大,加载角0°时的刚度大于加载角45°时的刚度。
The mechanical properties of eight L-shaped steel-reinforced concrete(SRC) columns with unequal limbs after high temperature exposure were investigated. An unburnt column was tested for comparison. All steel skeletons in the columns were in the form of trusses. The effects of load eccentricities and loading angles were investigated. The failure form, bearing capacity, strain distribution over the cross-section, load-slip curves and cross section deformation characteristics of the specimens were obtained from the tests. The test results show that the bearing capacity of L-shaped SRC columns does not significantly decrease after being exposed to fire. The composite action between the steel and the concrete can be ensured by proper arrangement of the steel and web members so that the plain section assumption still applies. The lateral stiffness of the longer limb is greater than that of the shorter limb, while the stiffness of SRC columns loaded in the direction of 0° is greater than the corresponding ones loaded in the direction of 45°.
The mechanical properties of eight L-shaped steel-reinforced concrete(SRC) columns with unequal limbs after high temperature exposure were investigated. An unburnt column was tested for comparison. All steel skeletons in the columns were in the form of trusses. The effects of load eccentricities and loading angles were investigated. The failure form, bearing capacity, strain distribution over the cross-section, load-slip curves and cross section deformation characteristics of the specimens were obtained from the tests. The test results show that the bearing capacity of L-shaped SRC columns does not significantly decrease after being exposed to fire. The composite action between the steel and the concrete can be ensured by proper arrangement of the steel and web members so that the plain section assumption still applies. The lateral stiffness of the longer limb is greater than that of the shorter limb, while the stiffness of SRC columns loaded in the direction of 0° is greater than the corresponding ones loaded in the direction of 45°.
引文
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[2] 吴波. 火灾后钢筋混凝土结构的力学性能[M]. 北京:科学出版社, 2003:86. (WU Bo. Mechanical properties of reinforced concrete structures after fire[M].Beijing:Science Press,2003:86.(in Chinese))
[3] 吴波, 徐玉野. 钢筋混凝土异形柱高温下力学性能的数值模拟[J]. 土木工程学报,2006,39(12):48-53.(WU Bo, XU Yuye. Numerical simulation of the mechanical behaviors of RC columns of specially-shaped cross section subjected to high temperature[J]. China Civil Engineering Journal, 2006,39(12):48-53. (in Chinese))
[4] 陈宗平,周文祥,徐金俊.高温后型钢高强混凝土界面黏结滑移性能试验研究[J].建筑结构学报,2015,36(12):106-115.(CHEN Zongping,ZHOU Wenxiang, XU Jinjun.Experimental study on bond-slip behavior of steel reinforced high strength concrete after high temperature[J]. Journal of Building Structures, 2015,36(12):106-115. (in Chinese))
[5] ZHU Weiqing, JIA Jingqing, GAO Juncheng, et al. Experimental study on steel reinforced high-strength concrete columns under cyclic lateral force and constant axial load[J]. Engineering Structures, 2016,125: 191-204.
[6] ZHAO Gentian, ZHANG Mengxi, LI Yonghe. Strength and behaviour of slender steel reinforced concrete composite columns[J].Advances in Structural Engineering, 2010, 13(2):231-240.
[7] JI Xiaodong, KANG Hongzhen, CHEN Xingchen, QIAN Jiaru. Seismic behavior and strength capacity of steel tube-reinforced concrete composite columns[J]. Earthquake Engineering & Structural Dynamics, 2014, 43 (4):226-230.
[8] XUE Jianyang, QI Liangjie, GAO Liang, LIU Zuqiang. Mechanical behavior of lattice steel reinforced concrete inner frame with irregular section columns under cyclic reversed loading[J]. Engineering Structures, 2016,128:225-236.
[9] 李俊华,唐跃峰,刘明哲. 火灾后型钢混凝土柱受力性能试研究[J]. 建筑结构学报, 2012,33(2):56- 63.(LI Junhua, TANG Yuefeng, LIU Mingzhe. Experimental study on mechanical properties of steel reinforced concrete columns after exposure to fire[J]. Journal of Building Structures, 2012,33(2):56- 63.(in Chinese))
[10] XU Lei, LIU Yubin.Concrete filled steel tube reinforced concrete (CFSTRC) columns subjected to ISO-834 standard fire[J]. Advances in Structural Engineering, 2013, 16 (7):1263-1282.
[11] 阎慧群. 高温(火灾)作用后混凝土材料力学性能研究[D]. 成都:四川大学, 2004:49.(YAN Huiqun. Mechanical properties of concrete after high temperature exposure[D]. Chengdu: Sichuan University, 2004:49.(in Chinese))