悬臂钢管混凝土构件在横向冲击荷载下承载性能有限元分析
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摘要
通过理论计算和有限元方法分析了悬臂钢管混凝土构件在横向冲击荷载下的力学性能.根据"统一理论"确定构件的极限弯矩,利用理论公式计算构件的挠度.采用有限元软件ANSYS/LS-DYNA模拟相应工况,并与理论结果比较,得到了构件重点部位的应力、应变和加速度时程.结果表明,当套箍系数、材料强度和尺寸一定时,构件最终挠度与冲击能量成正比;冲击能量从自由端向固定端传递,固定端截面逐步进入屈服,最终形成塑性铰,构件成为机动结构,丧失承载力;钢管混凝土构件具有较好的耗能和变形能力,应力、应变呈现典型弹塑性材料的特征.
The dynamic behavior of concrete-filled steel tube(CFST) specimens with one end fixed and the other end free are analyzed under lateral impact load by theoretical and finite element methods.The ultimate moment is determined by ‘Unified Theory’,and the deflection is computed using theoretical formula.The results obtained by software ANSYS/LS-DYNA are correct and reasonable compared with those of theoretical formula.The stress,strain and acceleration time-history curves on important position are analyzed based on the results.The results demonstrate:while the restriction parameter,material strength and size are constant,the final deflection is proportional to impact energy;the impact energy is transferred from the free end to the fixed end,and finally the plastic hinge is formed in the fixed end;the CFST has relatively higher ability of absorbing energy and deformation,and the typical plastic characteristic of the stress and strain are observed.
The dynamic behavior of concrete-filled steel tube(CFST) specimens with one end fixed and the other end free are analyzed under lateral impact load by theoretical and finite element methods.The ultimate moment is determined by ‘Unified Theory’,and the deflection is computed using theoretical formula.The results obtained by software ANSYS/LS-DYNA are correct and reasonable compared with those of theoretical formula.The stress,strain and acceleration time-history curves on important position are analyzed based on the results.The results demonstrate:while the restriction parameter,material strength and size are constant,the final deflection is proportional to impact energy;the impact energy is transferred from the free end to the fixed end,and finally the plastic hinge is formed in the fixed end;the CFST has relatively higher ability of absorbing energy and deformation,and the typical plastic characteristic of the stress and strain are observed.
引文
[1]钟善桐.钢管混凝土统一理论:研究与应用[M].北京:清华大学出版社,2006.
[2]韩林海.钢管混凝土结构:理论与实践[M].北京:科学出版社,2004.
[3]卢辉.钢管混凝土动力性能研究新进展[J].世界地震工程,2007,23(4):119-128.
[4]Prichard S J,Perry S H.The impact behaviour of sleevedconcrete cylinders[J].The Structural Engineering,2000,78(17):23-26.
[5]Xiao Yan,Zhang Wangxi,Shan Jianhua,et al.Impact testsof concrete filled tubes and confined concrete filled tubes[C]//6th International Con-ference on Shock&Impact LoadsOn Structures,Australia.Singapore:CI-Premier Pte Ltd,2005.
[6]Elfahal M M,Krauthammer T,Ohno T,et al.Size effectsfor normal strength concrete cylinders subjected to axialimpact[J].International Journal of Impact Engineering,2005,31(4):461-481.
[7]郑秋,霍静思,陈柏生,等.不同温度下钢管混凝土冲击力学性能试验研究[J].工程力学,2009,26(5):142-147.
[8]李珠,王兆,王蕊.侧向冲击荷载作用下两端固定钢管混凝土构件的试验研究[J].工程力学,2009(S1):167-170.
[9]王蕊,李珠,任够平,等.钢管混凝土梁在侧向冲击荷载作用下动力响应的试验研究和数值模拟[J].土木工程学报,2007,40(10):34-40.
[10]任够平,李珠,王蕊.低速侧向冲击下钢管混凝土柱挠度研究[J].工程力学,2008,25(5):170-175.
[11]张晨,徐勋倩.轴向冲击荷载作用下钢管混凝土短柱的试验研究[J].南通大学学报:自然科学版,2009,8(4):59-63.
[12]张晨,徐勋倩.轴向冲击荷载作用下钢管混凝土短柱有限元分析[J].四川建筑科学研究,2011,37(4):30-33.
[13]李裕春,时党勇,赵远.ANSYS11.0/LS-DYNA基础理论与工程实践[M].北京:中国水利水电出版社,2007.
[14]诺曼.琼斯.结构冲击[M].蒋平,译.成都:四川教育出版社,1994.
[15]钟善桐.钢管混凝土结构[M].3版.北京:清华大学出版社,2003.
[2]韩林海.钢管混凝土结构:理论与实践[M].北京:科学出版社,2004.
[3]卢辉.钢管混凝土动力性能研究新进展[J].世界地震工程,2007,23(4):119-128.
[4]Prichard S J,Perry S H.The impact behaviour of sleevedconcrete cylinders[J].The Structural Engineering,2000,78(17):23-26.
[5]Xiao Yan,Zhang Wangxi,Shan Jianhua,et al.Impact testsof concrete filled tubes and confined concrete filled tubes[C]//6th International Con-ference on Shock&Impact LoadsOn Structures,Australia.Singapore:CI-Premier Pte Ltd,2005.
[6]Elfahal M M,Krauthammer T,Ohno T,et al.Size effectsfor normal strength concrete cylinders subjected to axialimpact[J].International Journal of Impact Engineering,2005,31(4):461-481.
[7]郑秋,霍静思,陈柏生,等.不同温度下钢管混凝土冲击力学性能试验研究[J].工程力学,2009,26(5):142-147.
[8]李珠,王兆,王蕊.侧向冲击荷载作用下两端固定钢管混凝土构件的试验研究[J].工程力学,2009(S1):167-170.
[9]王蕊,李珠,任够平,等.钢管混凝土梁在侧向冲击荷载作用下动力响应的试验研究和数值模拟[J].土木工程学报,2007,40(10):34-40.
[10]任够平,李珠,王蕊.低速侧向冲击下钢管混凝土柱挠度研究[J].工程力学,2008,25(5):170-175.
[11]张晨,徐勋倩.轴向冲击荷载作用下钢管混凝土短柱的试验研究[J].南通大学学报:自然科学版,2009,8(4):59-63.
[12]张晨,徐勋倩.轴向冲击荷载作用下钢管混凝土短柱有限元分析[J].四川建筑科学研究,2011,37(4):30-33.
[13]李裕春,时党勇,赵远.ANSYS11.0/LS-DYNA基础理论与工程实践[M].北京:中国水利水电出版社,2007.
[14]诺曼.琼斯.结构冲击[M].蒋平,译.成都:四川教育出版社,1994.
[15]钟善桐.钢管混凝土结构[M].3版.北京:清华大学出版社,2003.
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