钢筋混凝土局部约束热轧H型钢柱抗震性能研究
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摘要
钢框架结构中H型钢柱在地震作用下局部屈曲导致承载力迅速下降,针对此问题肖岩教授提出了局部约束H型钢钢构件概念,通过在钢构件可能产生塑性铰的部位施加横向增强约束,限制或延缓局部屈曲的进一步发展,延缓钢构件由于局部屈曲导致的承载力迅速下降,提高了构件的延性和耗能性能,并且通过对钢板局部约束热轧H型钢柱试验研究,验证了这种约束柱的良好抗震性能。本文继续采用钢筋混凝土作为横向约束的主要材料,即H型钢翼缘内填充混凝土,外包钢筋,进行局部约束柱的抗震性能试验研究,主要进行了以下几个方面的工作:
(1)介绍了热轧H型钢的特点、应用以及相关研究;同时回顾了钢压弯构件在循环荷载作用下的研究及约束H型钢柱的概念。
(2)按照H型钢柱强轴、弱轴作用平面设计了4个大比例钢筋混凝土局部约束热轧H型钢柱试件,其中3个进行强轴平面内循环水平荷载试验,1个进行弱轴平面内循环水平荷载试验。
(3)对所设计的试件进行了常轴力和循环往复荷载作用下抗震性能试验,对试验结果和对比柱及钢板约束柱的破坏形态、柱的承载力、刚度、延性和耗能能力等进行了详细的对比分析,验证了钢筋混凝土对于改善H型钢柱抗震性能的有效性,同时也探讨了钢筋混凝土和钢板两种局部约束柱的差异。
(4)给出了约束柱的钢材本构模型,计算了柱在单调荷载作用下的弯矩-曲率、荷载-位移曲线,探讨了约束柱的抗震受力机理及过程。
Local bucling of H-shape steel columns caused by earthquake loading often causes bearing capacity falls down quickly in the monment-resisting frame. In order to solve this problem, Professor Xiao proposed an additional confinement. It can prevent or delay the inelastic buckling of H-shape steel columns at the potential plastic zones. Bearing capacity of H-shape steel columns falls down slowly because confinement prevents or delays the inelastic buckling of H-shape steel column. Expermental study of steel hoop confined H-shape steel columns indicated confined H-shape steel columns exhibited improved seismic performance with ductility compared with conventional H-shape steel columns. In this paper, experiment of RC confined H-shape steel columns is carried out under constant axial load and cyclic lateral forces. Confinement was made of the concrete block filled in flange girth and reinforcement hoop. The main work is summarized as follows:
(1) State of art about the characteristics and application of hot-rolled H-shape steel is given. We also review the experimental and analytical research work of hot-rolled H-shape and steel columns.
(2) Four large-scale H-shape steel columns were designed to simulate typical columns in multi-story building in seismic regions. The four columns were devided into two groups, in which three were for strong axis bending and one was for weak axis bending.
(3) All confined columns were tested under constant axial load and cyclic lateral forces. The failure mode, strength degradation, stiffness degradation, ductility and energy dissipation were reported to investigate the seismic behavior of RC confined columns. Comapred with the conventional H-shape steel comumns, the confined ones exhibited significantly improved seismic performance with large ducility. At the same time, the paper reported different character of RC and steel hoop confined columns.
(4) The paper proposed the mode of stress-strain of steel with confinement. We calculated the detail of moment-curve and load-displacement, and discussed the mechanics of confined H-shape steel columns.
(1)介绍了热轧H型钢的特点、应用以及相关研究;同时回顾了钢压弯构件在循环荷载作用下的研究及约束H型钢柱的概念。
(2)按照H型钢柱强轴、弱轴作用平面设计了4个大比例钢筋混凝土局部约束热轧H型钢柱试件,其中3个进行强轴平面内循环水平荷载试验,1个进行弱轴平面内循环水平荷载试验。
(3)对所设计的试件进行了常轴力和循环往复荷载作用下抗震性能试验,对试验结果和对比柱及钢板约束柱的破坏形态、柱的承载力、刚度、延性和耗能能力等进行了详细的对比分析,验证了钢筋混凝土对于改善H型钢柱抗震性能的有效性,同时也探讨了钢筋混凝土和钢板两种局部约束柱的差异。
(4)给出了约束柱的钢材本构模型,计算了柱在单调荷载作用下的弯矩-曲率、荷载-位移曲线,探讨了约束柱的抗震受力机理及过程。
Local bucling of H-shape steel columns caused by earthquake loading often causes bearing capacity falls down quickly in the monment-resisting frame. In order to solve this problem, Professor Xiao proposed an additional confinement. It can prevent or delay the inelastic buckling of H-shape steel columns at the potential plastic zones. Bearing capacity of H-shape steel columns falls down slowly because confinement prevents or delays the inelastic buckling of H-shape steel column. Expermental study of steel hoop confined H-shape steel columns indicated confined H-shape steel columns exhibited improved seismic performance with ductility compared with conventional H-shape steel columns. In this paper, experiment of RC confined H-shape steel columns is carried out under constant axial load and cyclic lateral forces. Confinement was made of the concrete block filled in flange girth and reinforcement hoop. The main work is summarized as follows:
(1) State of art about the characteristics and application of hot-rolled H-shape steel is given. We also review the experimental and analytical research work of hot-rolled H-shape and steel columns.
(2) Four large-scale H-shape steel columns were designed to simulate typical columns in multi-story building in seismic regions. The four columns were devided into two groups, in which three were for strong axis bending and one was for weak axis bending.
(3) All confined columns were tested under constant axial load and cyclic lateral forces. The failure mode, strength degradation, stiffness degradation, ductility and energy dissipation were reported to investigate the seismic behavior of RC confined columns. Comapred with the conventional H-shape steel comumns, the confined ones exhibited significantly improved seismic performance with large ducility. At the same time, the paper reported different character of RC and steel hoop confined columns.
(4) The paper proposed the mode of stress-strain of steel with confinement. We calculated the detail of moment-curve and load-displacement, and discussed the mechanics of confined H-shape steel columns.
引文
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[2] 高海建, 奚铁, 孙飞飞. 热轧 H 型钢的轧制及其工程应用. 建筑钢结构进展, 2002, 4(1):33-40
[3] 范国利. 热轧 H 型钢在工程应用中的应用. 新型建筑材料, 1997, (10):45-47
[4] 段玉玲,吴结才,吴学军.H 型钢在未来奥运场馆中的应用前景.建设科技,2002,(1):64-66
[5] G Haaijer, B Thurliman. On Inelastic Buckling in Steel. Journal of the Engineering Mechanics Division, 1958, 84(2):1-48
[6] 王俊平, 苏庆田. 国产轧制 H 型钢梁整体稳定性的研究. 工业建筑, 2000, 30(8):56-58
[7] 邓玉孙. 国产轧制 H 型钢梁的整体稳定性研究:[重庆大学硕士学位论文]. 重庆: 重庆大学, 2002, 68-71
[8] 戴国欣, 王浩科, 刘海鑫等. 国产轧制 H 型钢梁整体稳定几何控制条件. 钢结构, 2004, 19(4):62-64
[9] 汤卫华, 孙彤, 郝际平等. 莱钢产轧制 H 型钢构件受力性能的理论与试验研究(Ⅰ)-H 型钢构件偏心受力性能的试验研究. 建筑技术开发, 2004, 31(12):20-21
[10] 汤卫华, 孙彤, 郝际平等. 莱钢产轧制 H 型钢构件受力性能的理论与试验研究(Ⅱ)-H 型钢构件偏心受力性能的理论与试验研究. 建筑技术开发, 2005, 32(1):21-23
[11] 吴迪, 丁维, 郝际平等. 莱钢产轧制 H 型钢构件受力性能的理论与试验研究(Ⅲ)-H 型钢轴心受压构件极限承载力的试验研究. 建筑技术开发, 2005, 32(2):10-12
[12] 吴迪, 丁维, 郝际平等. 莱钢产轧制 H 型钢构件受力性能的理论与试验研究(Ⅳ)-H 型钢构件轴心受力性能的理论分析. 建筑技术开发, 2005, 32(3): 41-44
[13] 高丽亚, 丁维, 郝际平等. 莱钢产轧制 H 型钢构件受力性能的理论与试验研究(Ⅴ)-轧制 H 型钢梁整体稳定性能研究. 建筑技术开发, 2005, 32(4): 15-17
[14] 谈燕. 轧制 H 型钢悬臂梁的整体稳定性能研究:[昆明理工大学硕士学位论文]. 昆明: 昆明理工大学, 2006, 68-71
[15] Satish Kumar, Tsutomu Usami. Damage Evaluation in Steel Box Columns byCyclic Loading Tests. Journal of structural Engineering, 1996, 122(6): 626-634
[16] Tsutomu Usami, Shengbin Gao, Hanbin Ge. Elastoplastic Analysis of Steel Members and Frames Subjected to Cyclic Loading. Engineering Structures, 1998, 22(2):135-145
[17] Lizhi Jiang, Yoshiaki Goto, Makoto Obata. Hysteretic Modeling of Thin-Walled Circular Steel Columns under Biaxial Bending. Journal of Structural Engineering, 2002, 128(3):319-327
[18] Tetsuhiko Aoki, K.A.S.Susantha. Seismic Performance of Rectangular-Shaped Steel Piers under Cyclic Loading. Journal of Structural Engineering, 2005, 131(2):240-249
[19] Yoshiaki Goto, Kunsheng Jiang, Makoto Obata. Stability and Ductility of Thin-Walled Circular Steel Columns under Cyclic Bidirectional Loading, Journal of Structural Engineering, 2006, 132(10):319-327
[20] 苏明周, 顾强. 箱形截面钢压弯构件的滞回性能和板件宽厚比限值研究. 建筑结构学报, 2000, 21(5):41-47
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