【摘要】：地震作用下?lián)鯄K與主梁的橫向碰撞是影響橋梁結(jié)構(gòu)地震響應的重要因素,目前缺乏針對城市高架橋中廣泛使用的雙柱式小箱梁結(jié)構(gòu)橫向碰撞問題的研究。以此類橋梁的典型工程為代表,建立了空間有限元模型,利用Kelvin模型對橫向碰撞進行了準確模擬,重點探討了接觸單元剛度、擋塊-主梁間隙、橋墩墩高、場地類別、上部結(jié)構(gòu)與蓋梁質(zhì)量比等關鍵因素對雙柱式小箱梁結(jié)構(gòu)橋梁地震響應的影響。研究結(jié)果表明:碰撞剛度、碰撞間隙對雙柱墩墩底內(nèi)力有較大影響,應盡可能通過試驗予以確定;場地特性、上部結(jié)構(gòu)和蓋梁質(zhì)量比、橋墩高度等設計參數(shù),均會對橋梁的地震受力產(chǎn)生較大影響,因而應在設計選型時進行適當?shù)恼{(diào)整,并盡可能選擇堅硬場地下高墩輕質(zhì)主梁結(jié)構(gòu)體系,研究成果可為同類高架橋的設計提供技術支持。
[Abstract]:The transverse collision between retaining block and main beam under earthquake is an important factor affecting the seismic response of bridge structure. At present, there is a lack of research on the transverse collision of double-column small box girder structure, which is widely used in urban viaduct. Taking the typical engineering of this kind of bridge as the representative, the spatial finite element model is established, and the transverse collision is accurately simulated by using Kelvin model. The effects of contact element stiffness, block-main beam clearance, pier height, site type, superstructure to cover beam mass ratio on the seismic response of double-column small box girder bridge are discussed in detail. The results show that the impact stiffness and collision gap have great influence on the internal force at the bottom of the pier with double columns, and should be determined by the test as far as possible. Site characteristics, mass ratio of superstructure to cover beam, pier height and other design parameters will have a great impact on the seismic force of the bridge, so appropriate adjustment should be made in the design selection, and the lightweight main beam structure system with high piers under the hard site should be selected as much as possible. The research results can provide technical support for the design of the same kind of viaduct.
【作者單位】： 北京建筑大學土木與交通工程學院;貴港新興城投有限責任公司;
【基金】：建設部研究開發(fā)項目“多聯(lián)超長城市高架橋地震反應特點與合理抗震體系研究”(2010-k3-47) 北京市優(yōu)秀人才項目“北京市已建城市橋梁地震易損部位及合理加固措施研究”(070900601) 北京市教委科技計劃面上項目(2013)“考慮土-橋臺-結(jié)構(gòu)相互作用的曲線橋地震破壞機理研究”(KM201310016007) 國家青年自然科學基金“基于精細化數(shù)值模擬的FPS隔震曲線橋抗震性能研究”(51308027)
【分類號】：U442.55
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本文編號：2511412