摘要
由于空间条件的限制等因素,地铁结构按照传统的抗震设计难以达到使用要求,各城市地铁工程正逐渐尝试将减隔震技术运用到地铁上盖结构中。为研究隔震技术应用于地铁上盖结构的减震效果,对厦门某地铁车辆基地上盖结构进行了隔震设计,基于ETABS有限元软件,建立隔震与非隔震结构模型并对两种模型进行结构动力分析,结果表明:相对于非隔震结构,隔震结构的自振周期明显延长,隔震前后各层层间剪力比值不大于35.13%,各层层间倾覆力矩比值不大于32.73%。在大震作用下隔震层水平位移249mm且小于限值。隔震结构最大层间位移角为1/295,隔震支座最大拉应力为0.77MPa,均小于限值。因此,隔震技术应用于地铁上盖结构满足安全性和可靠性要求,具有良好的减震效果。
Due to the constraints of space conditions and other factors,the subway structure in accordance with the traditional seismic design is difficult to meet the requirements. The city subway project is gradually trying to reduce the isolation technology applied to the subway structure. In order to study the shock absorption effect of the isolation technology applied to the subway roof structure,the isolation structure of the superstructure of a subway vehicle base in Xiamen was designed. ETABS software was used to build the isolated and non-isolated structure model. The results show that the self-vibration period of the isolated structure is obviously prolonged with respect to the non-isolated structure,and the shear ratio of the interlayer is less than 35. 13% after the isolation. The ratio of the overturning moment is less than32. 73% after the isolation; Under the action of the earthquake,the isolation layer horizontal displacement is 249 mm,which is less than the limit. The maximum interlaminar displacement angle of the isolated structure is 1/295,and the maximum tensile stress of the isolation bearing is 0. 77 MPa,which is less than the specified limit. Therefore,the isolation technology used in subway cover structure meet the safety,reliability requirements,with a good shock absorption effect.
出处
《福建建筑》
2017年第7期97-103,134,共8页
Fujian Architecture & Construction
