铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2014年
1期
64-67,68
,共5页
铁路桥墩%空心高墩%动力时程分析%高阶振型%地震响应
鐵路橋墩%空心高墩%動力時程分析%高階振型%地震響應
철로교돈%공심고돈%동력시정분석%고계진형%지진향응
railway bridge pier%high hollow pier%dynamic time-history analysis%higher-order vibration mode%seismic response
研究高墩在强震作用下的地震反应。以铁路连续梁桥为例,基于抗震模拟软件Opensees,建立一个90 m的空心高墩,考虑高阶振型,进行非线性动力时程分析,求出加速度从0.1g至0.6g时墩顶位移、墩底弯矩的变化规律及塑性铰的形成和扩展情况。结果表明,加速度从0.1g调整为0.2g,0.4g,0.6g时,墩顶位移分别增加1.35,2.79,4.6倍,墩底弯矩分别增加1.49,2.54,3.38倍。墩底首先进入塑性区,墩中部后进入塑性区,塑性区的长度分别向墩底和墩顶扩展,向墩底比向墩顶扩展的更快更广泛。因此,高墩设计中不仅在墩底部位,也要在墩身中部布置足够的箍筋。
研究高墩在彊震作用下的地震反應。以鐵路連續樑橋為例,基于抗震模擬軟件Opensees,建立一箇90 m的空心高墩,攷慮高階振型,進行非線性動力時程分析,求齣加速度從0.1g至0.6g時墩頂位移、墩底彎矩的變化規律及塑性鉸的形成和擴展情況。結果錶明,加速度從0.1g調整為0.2g,0.4g,0.6g時,墩頂位移分彆增加1.35,2.79,4.6倍,墩底彎矩分彆增加1.49,2.54,3.38倍。墩底首先進入塑性區,墩中部後進入塑性區,塑性區的長度分彆嚮墩底和墩頂擴展,嚮墩底比嚮墩頂擴展的更快更廣汎。因此,高墩設計中不僅在墩底部位,也要在墩身中部佈置足夠的箍觔。
연구고돈재강진작용하적지진반응。이철로련속량교위례,기우항진모의연건Opensees,건립일개90 m적공심고돈,고필고계진형,진행비선성동력시정분석,구출가속도종0.1g지0.6g시돈정위이、돈저만구적변화규률급소성교적형성화확전정황。결과표명,가속도종0.1g조정위0.2g,0.4g,0.6g시,돈정위이분별증가1.35,2.79,4.6배,돈저만구분별증가1.49,2.54,3.38배。돈저수선진입소성구,돈중부후진입소성구,소성구적장도분별향돈저화돈정확전,향돈저비향돈정확전적경쾌경엄범。인차,고돈설계중불부재돈저부위,야요재돈신중부포치족구적고근。
The purpose of this paper was to ascertain the seismic response of high piers under the action of strong earthquake. Taking continuous girder bridge on railway as examples, based on seismic simulation software Opensees, considering higher-order vibration mode, this paper established a model of a high hollow pier of 90m in height and carried out nonlinear dynamic time-history analysis. Therefore, as the accelerated speed was adjusted from 0.1g to 0.6g, the change patterns of the pier top's displacement and pier bottom's bending moment were obtained, and the situation of formation and development of the plastic hinge was also obtained. The results show that:( a) As the accelerated speed is adjusted from 0.1g to 0.2g, 0.4g, 0.6g respectively, the pier top's displacement will increase by 1.35, 2.79, 4.6 times respectively, while the pier bottom's bending moment will increase by 1.49, 2.54, 3.38 times respectively. ( b) The pier bottom first gets into the plastic zone, followed by the middle part of the pier;then the length of the plastic zone spreads respectively towards the bottom and the top of the pier, while the spreading towards the top is faster and wider than towards the bottom. Therefore, the paper suggests that in the design of high pier, it is necessary to arrange sufficient stirrups not only at the bottom of a pier but at the middle part of the pier as well.
