考虑船舶影响的超高扬程升船机地震响应研究

Research on seismic response of ultra-high head ship lift considering ship Impact

采用ANSYS有限元软件,建立了200 m扬程的升船机整体有限元模型,包含了卷筒、钢丝绳、平衡重、塔柱、承船厢、顶部联系梁、纵横导向机构、挡土墙以及地基。利用Housner模型和修正Housner模型简化了厢-水、厢-水-船动力耦合模型。通过有限元计算,对比分析了8度地震作用下,厢内有船和无船两种工况时,升船机塔柱以及承船厢的位移和加速度响应以及特征部位的应力响应。结果表明:升船机塔柱顶部的最大横向位移为36.61 cm,满足规范限值要求;地震作用下底板和塔柱筒体的交界面发生应力集中现象,需加强配筋;厢内船舶对升船机整体系统的动力响应影响不大,但是对承船厢有较为明显的影响,在研究地震作用下承船厢动力响应时,厢内船舶不能被忽略。

Ansys finite element software was used to establish the overall finite element model of a 200-meter-high shiplift,including reel,wire rope,counterweight,tower,ship chamber,contact beam,vertical and horizontal guiding mechanism,retaining wall and foundation.The Housner and modified Housner model were used to simplify the tank-water and tank-water-ship dynamic coupling model.Through the finite element calculation,compared under the condition of ship chamber with ship and without ship,the displacement and acceleration response of the lift tower and ship chamber and the stress response of the characteristic part were analyzed under the action of 8 degree earthquake.The results show that the maximum lateral displacement of the top of the tower is 36.61 centimeter,which meets the requirements of the standard limit;Under the action of 8 degree earthquake,stress concentration is occured at the interface between the bottom plate and the tower,steel bars are necessary to be added;The impact of the ship on the dynamic response of the ship lift′s overall system is negligible,but it is more influential in the ship chamber.When studying the dynamic response of the ship chamber under the action of earthquake,the ship cannot be ignored.