摘要
目前人们已经认识到地震波斜入射与垂直入射对结构的影响是不同的,地震波斜入射时结构的竖向位移差和水平位移差会发生改变,但此类考虑地震斜入射的相关研究还十分稀少。现以两层三跨岛式地铁车站为研究对象,通过有限元软件建立土-地铁车站相互作用模型进行整体动力时程分析,以El centro波作为输入波研究地铁车站在任意角度地震波斜入射下关键截面的内力和层间位移的变化规律,为地铁车站抗震设计和地震灾害风险识别提供有关指导。研究表明:(1)地铁车站在地震波超临界角斜入射作用下明显存在一种放大效应,与垂直入射相比,轴力放大作用最明显可达2.01倍;(2)这种放大效应与场地硬度有关,场地越硬,放大效果越明显;(3)地震波超临界角入射,不仅对竖向地震作用有放大效应,同时对水平地震作用也有一定的放大效应,但垂直入射仍是水平作用最大的情况。
At present,people have realized that the impact of oblique incidence of seismic wave and vertical incidence on the structure is different,and the vertical displacement difference and horizontal displacement difference of the structure will change when the seismic wave is oblique incidence,but such research considering the oblique incidence of seismic wave is still very rare.Taking the two-layer threespan island subway station as the research object,the soil-meter station interaction model is established through finite element software to conduct the overall dynamic time-history analysis,and the El centro wave is used as the input wave to study the change law of the internal force and inter-story displacement of the key section of the subway station under the oblique incidence of the seismic wave at any angle,providing relevant guidance for the seismic design and seismic disaster risk identification of the subway station.The research shows that:(1) There is an obvious amplification effect in the subway station under the action of the oblique incidence of the seismic wave at the supercritical angle.Compared with the vertical incidence,the amplification effect of the axial force can reach 2.01 times.(2) This amplification effect is related to the hardness of the site.The harder the site is,the more obvious the amplification effect is.(3) Supercritical angular incidence of seismic wave not only has amplification effect on vertical seismic action,but also has certain amplification effect on horizontal seismic action,but vertical incidence is still the largest case of horizontal action.
作者
谭灿星
周瑾
TAN Canxing;ZHOU Jin(Guangdong Jianke Innovation Technology Research Institute Co.,Ltd.Guangzhou 510500,China;Guangzhou Pearl River Foreign Investment Architectural Designing Institute Co.,Ltd.Guangzhou 510060,China)
出处
《广东土木与建筑》
2023年第4期73-77,共5页
Guangdong Architecture Civil Engineering
关键词
地震响应
地铁车站
临界角
有限元
seismic response
subway station
critical angle
finite element
