本文選題：橋梁工程 + 深水橋墩　； 參考：《華中科技大學學報(自然科學版)》2017年08期

【摘要】：以深水橋梁的兩座橋墩為研究對象,考慮混凝土的非線性力學行為,以可有效計入墩-水流固耦合效應的勢流體完全數(shù)值法為基礎(chǔ)建立勢流體模型,并引入動水壓力簡化算法建立附加質(zhì)量模型.討論了墩周水域范圍及勢流體單元尺寸的合理取值,驗證了簡化算法在深水橋墩非線性動力分析中的有效性.對比討論了彈性模型、非線性模型動力響應的差別,對比了近、遠場地震下深水橋墩非線性動力響應的差異及分布特征.研究結(jié)果表明:當?shù)卣饎臃逯导铀俣?P_(PGA))較小時,橋墩非線性模型與彈性模型的動力響應相一致;隨P_(PGA)的增大,非線性模型的墩底彎矩、剪力均小于彈性模型,說明強震下橋墩會進入開裂甚至彈塑性狀態(tài),其力學行為與彈性模型差別明顯,應該考慮其在強震下潛在的非線性動力行為.近場地震下,深水橋墩的動力響應明顯高于遠場,墩底彎矩均值分別比遠場地震下大80.4%和34.4%,剪力均值分別大23.7%和28.9%,表明近場地震下橋墩會進入更強的非線性狀態(tài),對近斷層區(qū)深水橋梁的抗震設(shè)計提出了更高的要求.
[Abstract]:Taking the two piers of deep water bridge as the research object, considering the nonlinear mechanical behavior of concrete, the potential fluid model is established based on the full numerical method of potential fluid which can effectively take into account the coupling effect between pier and flow. An additional mass model is established by introducing the simplified algorithm of hydrodynamic pressure. The reasonable values of the water area around the pier and the size of the potential fluid unit are discussed, and the validity of the simplified algorithm in nonlinear dynamic analysis of deep water pier is verified. The difference of dynamic response between elastic model and nonlinear model is discussed, and the difference and distribution of nonlinear dynamic response of deep water pier under near and far field earthquake are compared. The results show that when the peak acceleration of local vibration is small, the dynamic response of the nonlinear model is consistent with that of the elastic model, and the bending moment and shear force of the nonlinear model are smaller than that of the elastic model. The results show that the pier will be cracked or even elastic-plastic under strong earthquake, and its mechanical behavior is obviously different from that of elastic model, so the potential nonlinear dynamic behavior of pier under strong earthquake should be considered. Under near field earthquake, the dynamic response of deep water pier is obviously higher than that of far field, the mean bending moment of pier bottom is 80.4% and 34. 4% larger than that of far field earthquake, and the mean value of shear force is 23. 7% and 28. 9% respectively, which indicates that the pier will enter a stronger nonlinear state under near field earthquake. Higher requirements for seismic design of deep water bridges near faults are put forward.
【作者單位】： 北京交通大學土木建筑工程學院;中國市政工程西北設(shè)計研究院有限公司;
【基金】：國家自然科學基金資助項目(51378050) 高等學校學科創(chuàng)新引智計劃資助項目(B13002) 中國鐵路總公司重大課題資助項目(2013G002-A-3) 中央高�；究蒲袠I(yè)務(wù)費專項資金資助項目(2016JBM044)
【分類號】：U442.55

【相似文獻】

相關(guān)期刊論文 前9條

1 吳國榮 ,鐘偉芳 ,李美之 ,梁以德;大運動柔性梁非線性動力響應分析[J];振動與沖擊;2005年01期

2 文堅;鳥撞載荷下Y12飛機前風擋非線性動力響應分析[J];航空學報;1990年11期

3 肖漢林;吳英友;朱顯明;劉土光;張濤;;軸向沖擊下環(huán)向加筋復合材料圓柱殼的非線性動力響應[J];振動與沖擊;2007年02期

4 易小剛;歐耀輝;劉永紅;;層合中厚非圓截面柱殼的非線性動力響應[J];長安大學學報(自然科學版);2008年04期

5 傅衣銘;張普;;軸對稱壓電圓板的非線性動力響應[J];應用力學學報;2009年03期

6 王新立,張仁述;樣條有限點法分析板的非線性動力響應問題[J];國防科技大學學報;1992年04期

7 鄧學工;;壓電粘彈性層合梁的非線性動力響應分析[J];中外建筑;2007年08期

8 謝文會;唐友剛;;考慮彈性變形鉸接塔平臺非線性動力響應[J];海洋工程;2007年02期

9 ;[J];;年期

相關(guān)會議論文 前2條

1 唐文勇;張圣坤;陳鐵云;;液面上復合材料板的非線性動力響應[A];第八屆全國結(jié)構(gòu)工程學術(shù)會議論文集（第Ⅲ卷）[C];1999年

2 陳昌萍;張祥敏;洪力;錢長照;;斜向裂紋彈性轉(zhuǎn)軸的非線性動力響應分析[A];中國力學大會——2013論文摘要集[C];2013年

，

本文編號：2036361