CAJ | 학술논문

采用黏弹性边界方法和地震动输入等效节点力方法模拟半无限场地的地震激励,结合通用有限元软件 ANSYS,建立地下隧道地震响应分析模型。模型采用等效线性化方法模拟土体非线性,采用瑞利阻尼和材料阻尼相结合方法模拟土体阻尼,分别考虑衬砌中混凝土和钢筋的非线性,以及衬砌和土体之间的接触。通过与文献比较,对整体模型的精度进行验证,并以天津市深厚覆盖层场地中某地铁双隧道为例进行非线性地震响应分析。研究表明,隧道间距较小时隧道之间存在显著相互作用,非线性地震动应力显著增大。本文模型可用于地下隧道一类结构的抗震验算分析。
채용점탄성변계방법화지진동수입등효절점력방법모의반무한장지적지진격려,결합통용유한원연건 ANSYS,건입지하수도지진향응분석모형。모형채용등효선성화방법모의토체비선성,채용서리조니화재료조니상결합방법모의토체조니,분별고필츤체중혼응토화강근적비선성,이급츤체화토체지간적접촉。통과여문헌비교,대정체모형적정도진행험증,병이천진시심후복개층장지중모지철쌍수도위례진행비선성지진향응분석。연구표명,수도간거교소시수도지간존재현저상호작용,비선성지진동응력현저증대。본문모형가용우지하수도일류결구적항진험산분석。
This paper presents a model for the nonlinear seismic response analysis of tunnels,in which the viscous-spring boundary method and the earthquake equivalent node force input method are combined for half-space seismic excitation and the general finite element software ANSYS is utilized for analysis.The model uses the equivalent linear method to model soil nonlinearity and combines Rayleigh damping and material damping to model soil damping.Concrete and reinforce-ment nonlinearity are considered separately,and soil-liner contact is taken into account.The mod-el is validated through comparisons with the results in the existing literature.The nonlinear seis-mic response of the metro twin tunnels in Tianjin City with thick soil layers is implemented,and it is shown that when two tunnels are close,the tunnel-tunnel interaction is significant and non-linear seismic stresses of the two tunnels become larger.This model can be used for the nonlinear seismic analysis of underground structures.