钢骨钢管混凝土柱偏心受压力学性能试验
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摘要
设计了不同偏心率、混凝土强度等级、套箍指标和配骨指标的6根钢骨钢管混凝土短柱试件,详细分析了试件在偏心受压下的破坏过程和破坏特征。试验表明:小偏心钢骨钢管混凝土柱的初始破坏是从近偏心受压侧的钢管受压屈服开始,最终破坏是由于混凝土膨胀引起了钢管局部的屈曲所致。钢骨钢管混凝土柱中的钢骨可以有效的阻止混凝土的剪切斜裂缝,从而提高了钢骨钢管混凝土的延性。在钢管纵向没有达到屈服前,钢骨钢管混凝土柱横截面应变分布呈线性分布,满足平截面假定。上下端铰接的小偏心钢骨钢管混凝土柱的侧向挠度曲线接近于正弦曲线,满足标准柱的假定。随混凝土强度的提高,配骨指标和套箍指标的增加,钢骨钢管混凝土柱的竖向承载力极值均有所提高;但随着偏心距的增加,试件的竖向承载力和延性会显著降低。
Considered strength classes of concrete,ratio of structural steel to concrete,ratio of steel tube to concrete and eccentricity ratio of load,6 test specimens of steel tubular columns filled with structural and concrete are designed.The damage phenomena of specimens are described in detail and the failure mechanism is analyzed.The results show the initial failure of the specimens are began from the yield of steel tube,the ultimate failure are ended from the buckling of steel tube caused by the expansion of core concrete.Due to the existence of structural steel,the ductility of specimens is superior to steel tubular columns.Before the yield of steel tube,the plane cross-section assumption of specimens can be put into use.The ultimate bearing capacity of specimens is increased with the increase of strength classes of concrete,ratio of structural steel to concrete and ratio of steel tube to concrete.But the ultimate bearing capacity and ductility are decreased with the increase of eccentricity ratio.
Considered strength classes of concrete,ratio of structural steel to concrete,ratio of steel tube to concrete and eccentricity ratio of load,6 test specimens of steel tubular columns filled with structural and concrete are designed.The damage phenomena of specimens are described in detail and the failure mechanism is analyzed.The results show the initial failure of the specimens are began from the yield of steel tube,the ultimate failure are ended from the buckling of steel tube caused by the expansion of core concrete.Due to the existence of structural steel,the ductility of specimens is superior to steel tubular columns.Before the yield of steel tube,the plane cross-section assumption of specimens can be put into use.The ultimate bearing capacity of specimens is increased with the increase of strength classes of concrete,ratio of structural steel to concrete and ratio of steel tube to concrete.But the ultimate bearing capacity and ductility are decreased with the increase of eccentricity ratio.
引文
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[3]王清湘,赵大洲,关萍.钢骨钢管高强混凝土轴压组合柱受力性能的试验研究[J].建筑结构学报,2003,24(6):44-49.WANG QING-XIANG,ZHAO DA-ZHOU,GUANPING.Study on the mechanical properties of axiallyloaded steel tubular columns filled with steel-reinforcedhigh-strength concrete[J].Journal of BuildingStructures,2003,24(6):44-49.
[4]关萍,王清湘,赵大洲.钢骨钢管混凝土受弯组合柱受力性能的试验研究[J].地震工程与工程震动,2003,23(2):57-60.GUAN PING,WANG QING-XIANG,ZHAO DA-ZHOU.Experimental research on mechanical behaviorof bending circular steel tube columns filled with steel-reinforced concrete[J].Earthquake Engineering andEngineering Vibration,2003,23(2):57-60.
[5]关萍,王清湘,赵大洲.钢骨钢管混凝土组合柱延性的试验研究[J].地震工程与工程震动,2003,23(1):84-89.GUAN PING,WANG QING-XIANG,ZHAO DA-ZHOU.Experimental study on ductility of circularsteel tubular columns filled with steel-reinforcedconcrete[J].Earthquake Engineering and EngineeringVibration,2003,23(1):84-89.
[6]孙飞飞,戴成华,李国强.大宽厚比开缝组合钢板墙低周反复荷载试验研究[J].建筑结构学报,2009,30(5):72-81.SUN FEI-FEI,DAI CHENG-HUA,LI GUO-QIANG.Cyclic test on large flakiness ratio composite steel platewalls with slits[J].Journal of Building Structures,2009,30(5):72-81.
[7]中华人民共和国国家标准局.GB/T 6397-86金属拉伸试验试样[S].北京:中国标准出版社,1986.
[8]中华人民共和国国家质量监督检验检疫总局.GB/T228-2002金属材料室温拉伸试验方法[S].北京:中国标准出版社,2002.
[9]谭克锋,蒲心诚,蔡绍怀.钢管超高强混凝土的性能与极限承载力的研究[J].建筑结构学报,1999,20(1):10-15.TAN KE-FENG,PU XIN-CHENG,CAI SHAO-HUAI.Study on the mechanical properties of steelextra-high strength concrete encased in steel tubes[J].Journal of Building Structures,1999,20(1):10-15.
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