东南大学学报(自然科学版)
東南大學學報(自然科學版)
동남대학학보(자연과학판)
JOURNAL OF SOUTHEAST UNIVERSITY
2010年
1期
160-164
,共5页
焦常科%李爱群%王浩%杨玉冬%吉林
焦常科%李愛群%王浩%楊玉鼕%吉林
초상과%리애군%왕호%양옥동%길림
三塔悬索桥%中央扣%地震响应%几何非线性
三塔懸索橋%中央釦%地震響應%幾何非線性
삼탑현색교%중앙구%지진향응%궤하비선성
triple-tower suspension bridge%central buckle%seismic response%geometry nonlinearity
针对三塔悬索泰州长江大桥这一特殊桥型,基于Abaqus台建立了该桥的空间动力有限元模型并进行非线性动力分析.研究了地震作用下,缆梁间刚性中央扣对三塔悬索桥塔梁位移、塔柱内力以及塔梁间弹性拉索的影响.研究结果表明:中央扣对三塔悬索桥动力特性有不可忽视的影响;由于中央扣增强了缆梁间相互作用,在地震作用下,中塔横向位移与加劲梁跨中竖向位移均有所增加,中塔柱纵桥向剪力有所减小;中央扣限制了加劲梁纵向位移并减小了加劲梁对中塔下横梁的作用,但边塔柱底扭矩有所增加.
針對三塔懸索泰州長江大橋這一特殊橋型,基于Abaqus檯建立瞭該橋的空間動力有限元模型併進行非線性動力分析.研究瞭地震作用下,纜樑間剛性中央釦對三塔懸索橋塔樑位移、塔柱內力以及塔樑間彈性拉索的影響.研究結果錶明:中央釦對三塔懸索橋動力特性有不可忽視的影響;由于中央釦增彊瞭纜樑間相互作用,在地震作用下,中塔橫嚮位移與加勁樑跨中豎嚮位移均有所增加,中塔柱縱橋嚮剪力有所減小;中央釦限製瞭加勁樑縱嚮位移併減小瞭加勁樑對中塔下橫樑的作用,但邊塔柱底扭矩有所增加.
침대삼탑현색태주장강대교저일특수교형,기우Abaqus태건립료해교적공간동력유한원모형병진행비선성동력분석.연구료지진작용하,람량간강성중앙구대삼탑현색교탑량위이、탑주내력이급탑량간탄성랍색적영향.연구결과표명:중앙구대삼탑현색교동력특성유불가홀시적영향;유우중앙구증강료람량간상호작용,재지진작용하,중탑횡향위이여가경량과중수향위이균유소증가,중탑주종교향전력유소감소;중앙구한제료가경량종향위이병감소료가경량대중탑하횡량적작용,단변탑주저뉴구유소증가.
As a special type of suspension bridge, Taizhou Bridge is a triple-tower suspension bridge. A spatial dynamic finite element model for it is established with finite element software Abaqus and the nonlinear dynamic analysis is performed. The influence of rigid central buckle be-tween main cables and stiffening girder on seismic response of this bridge is investigated in detail, including displacements of towers and girder, forces in tower columns and elastic cables between lower beam and girder at mid-tower. The central buckle has unneglectable influence on the dynamic behavior of the bridge. The results show that the central buckle enhances the interaction between main cables and stiffening girder. When the bridge is subjected to seismic loads, the central buckle may cause the increment of transverse displacement of mid-tower in the direction across bridge and the vertical displacement at mid-span. Moreover it decreases the shear force at the bottom of mid-tower in the longitudinal direction, and thus well limits the longitudinal displacement of stiffening girder, and reduces the interaction between stiffening girder and lower beam of mid-tower. Howev-er, the twisting moment at the end columns of side tower increases significantly.