结构工程师
結構工程師
결구공정사
STRUCTURAL ENGINEERS
2014年
4期
46-51
,共6页
闫聚考%李建中%彭天波
閆聚攷%李建中%彭天波
염취고%리건중%팽천파
三塔两跨悬索桥%行波效应%约束体系%绝对位移法
三塔兩跨懸索橋%行波效應%約束體繫%絕對位移法
삼탑량과현색교%행파효응%약속체계%절대위이법
suspension bridge%wave propagation effect%constraint system%absolute displacement method
大跨度多塔悬索桥各地面支承距离很大，行波效应对结构地震反应影响较大。基于直接输入位移法建立了多点激励时程分析模型。选取一座全长2940 m 的三塔两跨悬索桥为研究对象，分析了不同的塔梁纵向约束体系以及不同视波速下行波效应对大跨多塔悬索桥的影响。研究结果表明：行波效应可能会增大边塔底部的内力而减小中塔底部的内力，行波效应也可能会增大塔梁的相对位移和主梁与引桥梁的相对位移。因此，在对大跨度多塔连跨悬索结构进行抗震分析时，必须考虑行波效应的影响。
大跨度多塔懸索橋各地麵支承距離很大，行波效應對結構地震反應影響較大。基于直接輸入位移法建立瞭多點激勵時程分析模型。選取一座全長2940 m 的三塔兩跨懸索橋為研究對象，分析瞭不同的塔樑縱嚮約束體繫以及不同視波速下行波效應對大跨多塔懸索橋的影響。研究結果錶明：行波效應可能會增大邊塔底部的內力而減小中塔底部的內力，行波效應也可能會增大塔樑的相對位移和主樑與引橋樑的相對位移。因此，在對大跨度多塔連跨懸索結構進行抗震分析時，必鬚攷慮行波效應的影響。
대과도다탑현색교각지면지승거리흔대，행파효응대결구지진반응영향교대。기우직접수입위이법건립료다점격려시정분석모형。선취일좌전장2940 m 적삼탑량과현색교위연구대상，분석료불동적탑량종향약속체계이급불동시파속하행파효응대대과다탑현색교적영향。연구결과표명：행파효응가능회증대변탑저부적내력이감소중탑저부적내력，행파효응야가능회증대탑량적상대위이화주량여인교량적상대위이。인차，재대대과도다탑련과현색결구진행항진분석시，필수고필행파효응적영향。
For long-span multi-tower suspension bridges,the wave propagation effect has great impacts on structural seismic responses.A time history analytical model under multi-support excitations was established based on the direct displacement input method.A 2940-m three-tower two-span suspension bridge was selected for study.Nonlinear time-history analyses were performed and the influence of wave propagation on the long-span multi-tower suspension bridge was discussed in terms of different longitudinal constraint systems and wave traveling velocities.The results indicate that wave-traveling effect can increase the force in side towers but re-duce the force of the middle tower.It can also increase the relative displacement of tower-beam and the dis-placement between the main beam and the approach bridge beam.Therefore,the wave propagating effect should be considered in the seismic analysis of long-span multi-tower suspension bridges.
