基于摩擦摆支座简化模型的明钢管减隔震分析  

Seismic isolation analysis of exposed steel penstock based on a simplified model of a friction pendulum bearing

作　　者：石长征[1] 王廷超 徐裕旺 伍鹤皋[1] 白锐 SHI Changzheng;WANG Tingchao;XU Yuwang;WU Hegao;BAI Rui(State Key Laboratory of Water Resources Engineering and Management,Department of Hydroelectric Power Engineering,Wuhan University,Wuhan 430072,China;Yunnan Dianzhong Water Diversion Engineering Co.,Ltd.,Kunming 650000,China)

机构地区：[1]武汉大学水力发电工程系,水资源工程与调度全国重点实验室,武汉430072 [2]云南省滇中引水工程有限公司,昆明650000

出　　处：《清华大学学报（自然科学版）》2024年第7期1126-1135,共10页Journal of Tsinghua University(Science and Technology)

基　　金：云南省重大科技专项计划项目(202102AF080001)。

摘　　要：滇中引水工程位于高烈度地震区,输水结构抗震安全问题突出。该文以滇中引水工程某明钢管为研究对象,分析摩擦摆支座的减隔震效果,推导了摩擦摆支座的简化力学模型,据此建立摩擦摆支座简化弹簧有限元模型,并应用于明钢管的数值模拟中,对摩擦摆支座和平板滑动支座2种方案下的明钢管进行动力时程分析。结果表明:采用弹簧单元构建的摩擦摆支座简化有限元模型,可以较好地模拟摩擦摆支座的力学性能,提高明钢管结构有限元分析的效率;采用摩擦摆支座时,明钢管的地震动力响应规律与采用平板滑动支座时接近;与平板滑动支座相比,摩擦摆支座能更有效地降低钢管的加速度响应,减小支座水平向受力,且支座残余位移小,对明钢管减隔震效果更明显。[Objective]The Central Yunnan Water Diversion Project is situated in a high-seismic-intensity area,and the seismic safety of the water conveyance structure is prominent.Specifically,the significant mass of water within the exposed steel penstock and the inadequate restraint provided by bearings often result in obvious seismic displacement responses of the steel penstock.As a result,damage predominantly occurs at the bearings.Therefore,the mechanical properties of bearings are essential for the seismic resistance of steel penstocks.With the exposed steel penstock from the Central Yunnan Water Diversion Project as the research object,the seismic isolation effect of friction pendulum bearings is examined.[Methods]Suppose that the friction pendulum bearing adopts an elliptical sliding surface.A simplified mechanical model of the bearing is derived.Based on this model,a simplified finite element model of the friction pendulum bearing is developed by spring elements and applied to the finite element simulation of the exposed steel penstock.Dynamic time history analysis of the steel penstock using friction pendulum bearings and flat sliding bearings is conducted.In the simplified spring finite element model of the friction pendulum bearing,the COMBIN39 and COMBIN40 elements in the ANSYS software are used to simulate the horizontal nonlinear force-displacement curve of the friction pendulum bearing,and the COMBIN14 element is used to simulate the vertical stiffness of the bearing.[Results]The results revealed that the structural acceleration and displacement distribution and values computed by using the simplified model were close to those of the fine model.Thus,it was obvious that the simplified finite element model of a friction pendulum bearing constructed by spring elements could simulate the mechanical properties of a friction pendulum bearing well and enhance the efficiency of the finite element simulation analysis of the exposed steel penstock structure.The seismic dynamic response law of the steel penstock with f

关 键 词：明钢管 摩擦摆支座 减隔震 有限元模拟 

分 类 号：TV672.2[水利工程—水利水电工程]