大型高墩通航渡槽墩身二级设防水准地震响应分析  

Earthquake response analysis of high piers of huge navigable f lume with grade Ⅱ fortif ication

作　　者：高兴赞 何雄君[1] 秦清波 尹栋佳 陈宇琨[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063 [2]长江勘测规划设计研究院,湖北武汉430030

出　　处：《铁道建筑》2015年第5期38-42,共5页Railway Engineering

基　　金：国家自然科学基金项目(51178361)

摘　　要：为了研究大型高墩通航渡槽墩身的地震响应,以乌江构皮滩水电站大型渡槽为例,基于纤维单元模型的方法分析渡槽墩身结构地震响应的规律。结果表明：空槽状态地震作用E1和E2主要影响墩身结构的剪力和弯矩,且其数值与地震动加速度成正比;满槽状态地震响应对墩身结构的轴向力影响较大,墩身的轴向力是空槽状态下的1.08~1.45倍,但是剪力和弯矩变化不大;墩身越高轴向力在满槽状态动水作用下的地震响应变化幅度越小;满槽状态,在E1地震作用下墩身各潜在非弹性铰截面均未出现明显的塑性变形,保持在弹性状态,在E2地震作用下,墩身潜在非弹性铰产生大面积的塑性变形。这些二级设防应力分布特征有利于大型高墩渡槽墩身整体及局部的抗震能力设计。In order to analyze the earthquake response of huge navigable flume with high piers, earthquake response pattern is analyzed in this paper based on the fiber element mode of huge navigable flume of Goupitan Hydropoveer Station in Wujiang. The analysis results show that seismic excitation E1 and E2 ,both of which is proportional to the ground motion acceleration, have the main effect on shear stress and bending moment in the pier structure when no water is in the aqueduct. However, when the flume is filled with water, the earthquake response significantly affects the axial stress rather than shear or moment. The axial stress is 1.08 - 1.45 times that of no water. It also shows that,under the dynamic effect of water in flume the higher the pier is, the smaller axial stress change ratio is. With E1 effect,elastic state rather than plastic state is observed at potential non-elastic hinge joints in pier. With E2 effect, plastic deformation occurs in potential non-elastic cross-sections extensively. The distribution characteristics of huge navigable flume with high piers with Grade II seismic design is helpful for both overall and local seismic design.

关 键 词：大型高墩通航渡槽 墩身结构 纤维模型 地震响应分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]