桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
3期
37-43
,共7页
陈士通%张文学%杜修力%刘海陆
陳士通%張文學%杜脩力%劉海陸
진사통%장문학%두수력%류해륙
连续梁桥%锁死销%地震响应%有限元法%减震效果%加速度激活阀值%锁死间隙
連續樑橋%鎖死銷%地震響應%有限元法%減震效果%加速度激活閥值%鎖死間隙
련속량교%쇄사소%지진향응%유한원법%감진효과%가속도격활벌치%쇄사간극
continuous girder bridge%locking dow el%seismic response%finite element meth-od%seismic mitigation effect%acceleration activating threshold%locking clearance
为了解锁死销对不同墩高的连续梁桥纵向抗震性能的影响，基于锁死销的工作原理，以石长铁路沅江特大桥主桥[（62．5＋5×96＋62．5） m预应力混凝土连续梁桥]为背景，采用A N‐SYS建立不同墩高的全桥有限元模型，分析了锁死销的减震性能及其参数对减震效果的影响。结果表明：在滑动墩上设置锁死销可显著提高连续梁桥的整体抗震性能，适度增加各滑动墩内力响应可有效降低固定墩的内力和梁端位移；减震效果随着加速度激活阀值的增大而逐步降低；加速度激活阀值和锁死间隙变化时，滑动墩墩高越矮，其地震响应变化越明显。建议采用锁死销装置对不同墩高的连续梁桥进行减震时应注意对矮墩的保护。
為瞭解鎖死銷對不同墩高的連續樑橋縱嚮抗震性能的影響，基于鎖死銷的工作原理，以石長鐵路沅江特大橋主橋[（62．5＋5×96＋62．5） m預應力混凝土連續樑橋]為揹景，採用A N‐SYS建立不同墩高的全橋有限元模型，分析瞭鎖死銷的減震性能及其參數對減震效果的影響。結果錶明：在滑動墩上設置鎖死銷可顯著提高連續樑橋的整體抗震性能，適度增加各滑動墩內力響應可有效降低固定墩的內力和樑耑位移；減震效果隨著加速度激活閥值的增大而逐步降低；加速度激活閥值和鎖死間隙變化時，滑動墩墩高越矮，其地震響應變化越明顯。建議採用鎖死銷裝置對不同墩高的連續樑橋進行減震時應註意對矮墩的保護。
위료해쇄사소대불동돈고적련속량교종향항진성능적영향，기우쇄사소적공작원리，이석장철로원강특대교주교[（62．5＋5×96＋62．5） m예응력혼응토련속량교]위배경，채용A N‐SYS건립불동돈고적전교유한원모형，분석료쇄사소적감진성능급기삼수대감진효과적영향。결과표명：재활동돈상설치쇄사소가현저제고련속량교적정체항진성능，괄도증가각활동돈내력향응가유효강저고정돈적내력화량단위이；감진효과수착가속도격활벌치적증대이축보강저；가속도격활벌치화쇄사간극변화시，활동돈돈고월왜，기지진향응변화월명현。건의채용쇄사소장치대불동돈고적련속량교진행감진시응주의대왜돈적보호。
To understand the impact of the locking dowels on the longitudinal seismic perform‐ance of continuous girder bridge with different pier height ,the main bridge of the Yuanjiang River Bridge [a prestressed concrete continuous girder bridge with span arrangement (62 .5+5 × 96+62 . 5) m] on Shimen‐Changsha Double‐Track Railway was taken as an example and with reference to the working principles of the dowels ,the ANSYS was used to set up the finite element model for the whole bridge of the bridge with different pier height ,the seismic mitigation performance of the dowels and the impact of the parameters of the dowels on the seismic mitigation effect were ana‐lyzed .The results of the analysis show that the locking dowels arranged on the sliding piers can significantly improve the global seismic performance of the continuous girder bridge and the proper increase of the internal force responses of the sliding piers can effectively decrease the internal forces of the fixed piers and girder end displacement .The seismic mitigation effect of the dowels gradually decreases with the increase of the acceleration activating thresholds .At the time the ac‐celeration activating thresholds and locking clearances change ,the lower the sliding piers are ,the more significant the seismic response changing of the piers will be .It is therefore proposed that at‐tention should be paid to the protection of the low piers as the locking dowels are used for the seis‐mic mitigation of the continuous girder bridges with different pier height .
