考虑P-Δ效应的钢筋混凝土空心高墩地震响应分析
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摘要
在考虑二次内力和变形影响条件下,使用有限元软件ANSYS对78 m钢筋混凝土空心高墩的地震动力响应进行数值模拟。将天津地震波引入高桥墩,运用时程分析原理进行分析,得到桥墩的前两阶振型图;运用Newmark的逐次渐进法考虑P-Δ效应,得到藕合后的振型分析图。分析表明:考虑效应会增加响应幅值;随着桥墩高度的增加,墩底弯矩值增加幅度越来越大,当墩高接近80 m时,趋于直线增长。
Considering the two influence of internal force and deformation conditions,the finite element software ANSYS is used to simulate the seismic response for 78 m reinforced concrete hollow high pier.According to the Newmark-βTime History Analysis,the first two modal maps of piers were done under the Tianjin Seismis which was input into the high-piers.And according to the Newmark successive incremental method,the two modal maps were done under the coupling which includes p-Δ effects and seismic response.In the graph,seismis response value increases when p-Δ effects were considered.With the increase in height of the piers,the moment valve of pier buttom increases more and more.When the height of pier approaches 80 meters,it te nds to line up.
Considering the two influence of internal force and deformation conditions,the finite element software ANSYS is used to simulate the seismic response for 78 m reinforced concrete hollow high pier.According to the Newmark-βTime History Analysis,the first two modal maps of piers were done under the Tianjin Seismis which was input into the high-piers.And according to the Newmark successive incremental method,the two modal maps were done under the coupling which includes p-Δ effects and seismic response.In the graph,seismis response value increases when p-Δ effects were considered.With the increase in height of the piers,the moment valve of pier buttom increases more and more.When the height of pier approaches 80 meters,it te nds to line up.
引文
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[2]肖盛燮.生态环境灾变链式理论原创结构梗概[J].岩石力学与工程学报,2006,25(增1):2593-2602.
[3]陈卉卉.大跨度连续刚构桥地震反应分析[D].南京:河海大学土木工程学院,2007:20-26.
[4]余玲玲.高墩大跨连续刚构桥地震反应分析[D].长沙:湖南大学土木工程学院,2008:5-7.
[5]申永刚,陈建伟,项贻强.薄壁高墩大跨连续刚构桥墩抗震性能的分析[J].公路学报,2007(4):92-96.
[6]王呼佳,陈洪军.Ansys工程分析进阶实例[M].北京:中国水利水电出版社,2009:225-233.
[7]郑国栋,李校兵.不同方法对某桥梁抗震分析的影响比较[J].公路学报,2010(3):60-65.
[8]陈军,李德建.高墩连续梁桥变截面桥墩自振频率计算的频率合成法[J].铁道科学与工程学报,2008,5(3):28-31.
[9]JTJ044-89公路工程抗震设计规范[S].北京:人民教育出版社,1989.
[10]李睿,董明.考虑P-Δ效应的高墩抗震计算[J].云南工业大学学报,1999,15(1):61-70.
[11]许锐,樊建国.考虑P-Δ效应的高墩桥计算方法研究[J].河北工业大学成人教育学院学报,2007,22(4):56-58.
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