基于桩-土作用的山区桥梁滚石撞击结构动力响应分析
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摘要
采用大型通用显式动力学软件ANSYS/LS-DYNA及HJC损伤本构关系建立了基于桩-土作用的滚石撞击桥墩三维有限元模型,模拟了滚石在不同因素下撞击桥墩的动力响应.研究表明:HJC材料本构关系能够很好地模拟钢筋混凝土桥墩在滚石撞击下的损伤状况,滚石撞击桥墩时桥墩结构损伤以局部损伤为主;桥墩的动力响应随滚石质量的增大而增大;滚石撞击位置对结构位移动力响应影响很大.
Based on the large-scale universal explicit dynamics software ANSYS/LS-DYNA and HJC damage constitutive relation, a three-dimensional finite element model of the rolling stole impact pier based on pile-soil interaction was established, and the dynamic response of the rolling stone under different factors was simulated. The research shows that the constitutive relation of HJC material can simulate the damage of reinforced concrete pier under the impact of rolling stone; when the rock impacting pier is damaged, the damage of the pier is mainly local damage; the dynamic response of the pier increases with the increase of the quality of the rolling stone; the impact position of the rolling stone has a great influence on the structural displacement dynamic response.
Based on the large-scale universal explicit dynamics software ANSYS/LS-DYNA and HJC damage constitutive relation, a three-dimensional finite element model of the rolling stole impact pier based on pile-soil interaction was established, and the dynamic response of the rolling stone under different factors was simulated. The research shows that the constitutive relation of HJC material can simulate the damage of reinforced concrete pier under the impact of rolling stone; when the rock impacting pier is damaged, the damage of the pier is mainly local damage; the dynamic response of the pier increases with the increase of the quality of the rolling stone; the impact position of the rolling stone has a great influence on the structural displacement dynamic response.
引文
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[ 2 ] 朱长华,赵宝,裴浩楠,等.基于ANSYS/LS-DYNA连续玄武岩纤维材料护栏碰撞吸能分析[J].沈阳大学学报(自然科学版),2017,29(5):415-418.ZHU C H,ZHAO B,PEI H N,et al.Collision energy absorption analysis of continuous basalt fiber fence based on ANSYS/LS-DYNA[J].Journal of Shenyang University(natural science),2017,29(5):415-418.
[ 3 ] PICHLER B,HELLMICH C,MANG H.Impact of rocks onto gravel design and evaluation of experiments[J].International journal of impact engineering,2005,31(5):559-78.
[ 4 ] 王刚.钢筋混凝土柱抗落石撞击试验研究[D].成都:西南交通大学,2012.WANG G.Experimental study on impact resistance of reinforced concrete columns against falling rocks[D].Chengdu:Southwest Jiaotong University,2012.
[ 5 ] 曲激婷,宋全宝.建筑结构连续倒塌破坏分析的数值模拟研究方法综述[J].沈阳大学学报(自然科学版),2018,30(2):142-150.QU J T,SONG Q B.Summary of numerical simulation methods for analysis of continuous collapse and failure of building structures[J].Journal of Shenyang University(natural science),2018,30(2):142-150.
[ 6 ] 中华人民共和国交通部.公路桥涵地基及基础设计规范:TGD63-2007[S].北京:人民交通出版社,2007.Ministry of Transport of the People’s Republic of China.Code for design of foundation and foundation of highway bridges and culverts:JTGD63-2007[S].Beijing:People's Transportation Press,2007.
[ 7 ] 巫绪涛,李耀,李和平.混凝土HJC本构模型参数的研究[J].应用力学学报,2010,27(2):340-344.WU X T,LI Y,LI H P.Study on constitutive model parameters of concrete HJC[J].Journal of applied mechanics,2010,27(2):340-344.
[ 8 ] 刘建成,顾永宁.基于整船整桥模型的船桥碰撞数值仿真[J].工程力学,2003,20(5):155-162.LIU J C,GU Y N.Numerical simulation of ship-bridge collision based on the whole ship-bridge model[J].Engineering mechanics,2003,20(5):155-162.
[ 9 ] 余志祥,许浒,吕蕾,等.落石冲击对山区桥梁墩柱破坏的影响[J].四川大学学报(工程科学版),2012,44(6):86-91.YU Z X,XU H L,LYU L,et al.Impact of rockfall on pier and column failure of bridges in mountainous areas[J].Journal of Sichuan University(engineering science edition),2012,44(6):86-91.
[10] 袁进科,裴向军.滚石冲击对彻底关大桥墩柱的破坏模拟研究[J].公路,2014(2):22-27.YUAN J K,PEI X J.Modeling and study of impact damage to piers of Chediguan Bridge[J].Highway,2014(2):22-27.
[11] 彭天波,唐伟亚,韩磊.局部集中质量接触单元法在梁式桥梁体与桥台碰撞问题模拟中的应用[J].工程力学,2015,32(9):49-57.PENG T B,TANG W Y,HAN L.Application of locally concentrated mass contact element method in simulation of collision between beam bridge and abutment[J].Engineering mechanics,2015,32(9):49-57.