基于OpenSEES的圬工拱桥内力分析及倒塌过程模拟
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摘要
该文采用截面内力积分程序,研究某圬工拱桥精细化实体单元有限元模型在左桥台施加不同水平向位移的工况下,主拱圈和拱脚的关键截面轴力、剪力和弯矩的分布和发展趋势,并根据该趋势预测圬工拱桥的倒塌顺序,得出随着圬工拱桥桥台的滑移,离滑移端最近的拱圈受力最不利;其次,利用OpenSEES作为桥梁渐进倒塌破坏分析的求解内核,对大应变TLFD8nBrick单元进行二次开发,开发了相应的3D实体单元及几何非线性动力分析方法,并以应变作为单元的失效准则,通过单元生死技术模拟圬工拱桥的损伤破坏,实现拱桥的渐进式垮塌模拟,倒塌顺序与内力分析预测结果一致。结果表明:对不同工况下桥梁关键截面的内力发展情况进行研究,可有效的揭示圬工拱桥垮塌机理;其次,针对OpenSEES中的大应变单元进行二次开发,能准确模拟桥梁构件渐进破坏过程;最后采用3D图形动画可直观显示桥梁渐进倒塌过程。
This paper studied the distribution and development of axial force,shearing force,and bending moment in the key section of a masonry arch bridge under different horizontal displacements of the left abutment of the bridge by using the sectional internal force integral program.According to the collapse analysis of the masonry arch bridge,the critical stress position was found to lie in the closest arch away from the sliding end of the slipped abutment.Moreover,OpenSEES was used to perform the progressive collapse analysis,in which the large strain TLFD8nBrick element was developed,the 3D solid element was created and the geometrically nonlinear dynamic method was established.Taking the strain as the index of failure,the simulation of the progressive collapse of the masonry arch bridge is performed by modeling the initial damage and using the "killing or activating elements" technology.The results show that this research can effectively reveal the collapse mechanism of the masonry arch bridge.In addition,the further development of the large strain element in OpenSEES can accurately simulate the progressive collapsing process of the bridge.
This paper studied the distribution and development of axial force,shearing force,and bending moment in the key section of a masonry arch bridge under different horizontal displacements of the left abutment of the bridge by using the sectional internal force integral program.According to the collapse analysis of the masonry arch bridge,the critical stress position was found to lie in the closest arch away from the sliding end of the slipped abutment.Moreover,OpenSEES was used to perform the progressive collapse analysis,in which the large strain TLFD8nBrick element was developed,the 3D solid element was created and the geometrically nonlinear dynamic method was established.Taking the strain as the index of failure,the simulation of the progressive collapse of the masonry arch bridge is performed by modeling the initial damage and using the "killing or activating elements" technology.The results show that this research can effectively reveal the collapse mechanism of the masonry arch bridge.In addition,the further development of the large strain element in OpenSEES can accurately simulate the progressive collapsing process of the bridge.
引文
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[2]Lau David T,Wibowo Hartanto.Seismic progressivecollapse analysis of reinforced concrete bridges byapplied element method[J].Earth and Space 2010:Engineering,Science,Construction,and Operations inChallenging Environments,2010,27:3019―3026.
[3]Abolhassan Astaneh-Asl.Progressive collapse of steeltruss bridges,the case of I-35w collapse[C].7thInternational Conference on Steel Bridges,Guimar es,Portugal,June 4-6,2008:1―10.
[4]Hollis Stambaugh,Harold Cohen.1-35w bridge collapseand response[R].California:Technology to HelpExplain Minneapolis Bridge Collapse,2007.
[5]卢啸,陆新征,叶列平,何水涛.钢筋混凝土拱桥构件重要性评价及超载导致垮塌破坏模拟[J].计算机辅助工程,2010,19(3):26―30.Lu Xiao,Lu Xinzheng,Ye Lieping,He Shuitao.Component importance evaluation and overload-inducedcollapse simulation for reinforced concrete arch bridge[J].Computer Aided Engineering,2010,19(3):26―30.(in Chinese)
[6]潘龙,孙利民,范立础.基于推倒分析的桥梁地震损伤评估模型与方法[J].同济大学学报,2001,29(1):10―14.Pan Long,Sun Limin,Fan Lichu.Seismic damageassessment model and method based on pushoveranalysis for bridges[J].Journal of Tongji University,2001,29(1):10―14.(in Chinese)
[7]Sun Limin,Zhou Cen,Cheng Wei.Nonlinear seismicresponse analysis of RC bridge[C].The 3rd ChineseSymposium on Structural Vibration Control.Shanghai,2002.
[8]Sun Limin,Yu Xingpeng,Cen Zhou.Simulationtechniques for collpase analysis of RC bridge understrong earthquake[C].The 4th International Conferenceon Earthquake Engineering.Taipei,China,2006.
[9]周艳,张雷明,刘西拉.美国Cypress高架桥地震垮塌的仿真分析[J].岩石力学与工程学报,2005,24(17):3036―3044.Zhou Yan,Zhang Leiming,Liu Xila.Collapse simulationand analysis of cypress viaduct loma prieta earthquake[J].Chinese Journal of Rock Mechanics and Engeering,2005,24(17):3036―3044.(in Chinese)
[10]王国鼎.拱桥连拱计算[M].第3版.北京:人民交通出版社,37―107.Wang Guoding.Calculation of multi-arch bridge[M].3rd ed.Beijing:China Communications Press,37―107.(in Chinese)
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