基于能量原理的钢筋混凝土桥墩抗震安全系数
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摘要
从能量的角度提出了桥墩抗震耗能能力安全系数的概念,通过合理给定位移和损伤控制条件并结合钢筋混凝土构件的损伤指标方程和结构地震反应的能量方程推导出了这一安全系数。最后用通用有限元软件对一实例钢筋混凝土桥墩抗震耗能能力安全系数进行了计算,验证了方法的可行性。研究结果表明:通过给定合理位移和损伤控制条件可以简便地求出桥墩的有效总耗能能力并可由此得到不同地震动输入情况下的桥墩耗能能力安全系数。对今后基于能量原理的抗震设计和评估方法的应用,具有一定的参考作用。
The concept of the safety factor on the ability of energy dissipation of the reinforced bridge pier is put forward and deduced,based on the dynamic energy equation of multi-degree structures and the damage index of the reinforced concrete structures,which is researched under two given displacement and damage controlling conditions.In addition,a real pier is analyzed in practical to show the feasibility of the theory,where the popular software ANSYS is utilized.The results show that the real ability of energy dissipation of the reinforced bridge pier can be calculated under given displacement and damage controlling conditions and then the safety factor can be obtained subsequently in varied earthquakes.The result can be referable to the structure antiseismic design and evaluation.
The concept of the safety factor on the ability of energy dissipation of the reinforced bridge pier is put forward and deduced,based on the dynamic energy equation of multi-degree structures and the damage index of the reinforced concrete structures,which is researched under two given displacement and damage controlling conditions.In addition,a real pier is analyzed in practical to show the feasibility of the theory,where the popular software ANSYS is utilized.The results show that the real ability of energy dissipation of the reinforced bridge pier can be calculated under given displacement and damage controlling conditions and then the safety factor can be obtained subsequently in varied earthquakes.The result can be referable to the structure antiseismic design and evaluation.
引文
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[2]周智辉,曾庆元,向俊.新郑大桥改建新桥横向刚度分析[J].中南大学学报,2006,37(1):165~168
[3]汪梦甫,糜永红.基于能量理论的钢筋混凝土框架-剪力墙结构结构非线性地震反应分析[J].工程抗震,2004,4(2)15~16
[4]Park YJ,Ang HS.Mechanistic Seismic Damae Model forReinforced Concrete[J].Journal of Structure Engineering,ASCE,1985,111(4):722~739
[5]瞿岳前,梁兴文,田野.基于能量分析的地震损伤性能评估[J].世界地震工程,2006,3(1):109~114
[6]欧进萍,何政,吴斌,龙旭.钢筋混凝土结构的地震损伤控制设计[J].建筑结构学报,2002,2(1):63~76
[7]王东升,等.改进的Park-Ang地震损伤模型及其比较[J].工程抗震与加固改造,2005,12(27):138~144
[8]肖明葵,刘纲.结构的滞回耗能特性及其影响因素分析[J].工程力学,2000,(增刊):242~247
[9]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006:246
[10]肖明葵,刘波,等.抗震结构总输入能量及影响分析[J].重庆建筑大学学报,1996,6(2):20~33
[11]刘波,肖明葵,等.结构地震总输入能量的分配[J].重庆建筑大学学报,1996,6(2):100~109
[12]江辉,朱唏.近断层地震地面运动的能量与位移延性需求[J].工程抗震与加固改造,2005,8(4)58~62
[13]程光煜,叶列平.弹性多自由度系统地震输入能量的研究[J].工程抗震与加固改造,2006,8(4)6~9
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