【摘要】 以华庄公路关山隧道为研究对象,通过建立大型三维有限元模型,采用一种人工构成的短时间正弦扫描Johnson/Epstein地震记录进行地震动力分析。该记录具有在较短时程内包含较大的实际地震频率范围的特点,从而减小计算分析的持续时间。通过对3种工况(不设置抗震缝、设置2条和3条抗震缝)计算,结果表明:关山隧道衬砌结构的动力响应以横向的受力特征为主,拱顶处横向加速度和横向位移最大,仰拱及拱底处横向加速度峰值和横向位移峰值较小,设置3条抗震缝时的围岩体位移和应力明显优于其他工况,该设计方案能满足8度区抗震要求。更多还原

【Abstract】 Taken Guanshan tunnel of Huazhuang highway as the research subject,the seismic dynamic response characteristic was analyzed by using large-scale 3D finite element model and an artificial synthesized short-time sinusoid scan wave,Johnson/Epstein,which has the character of involving more extensive frequency of seismic wave so as to decreasing computing time.The calculation result of three working conditions(no aseismatic joint,two joints and three joints) demonstrates that(1) the principal mechanic characteristic of the dynamic response of Guanshan tunnel lining is transverse,the maximum transverse acceleration and displacement is distributed in vault,while the peak values of transverse acceleration and displacement are less in inverted arch and arch bottom;(2) setting up three joints for seismic resistance is prior and can satisfy the design requirements in the seismic region with intensity 8.更多还原