某学院楼减隔震方案比选与设计

Comparison and design of seismic isolation schemes for a college building

某学校学院楼项目结构高度为23.5m,下部采用混凝土框架结构,上部有一大跨度钢桁架结构横跨在两端教学区结构上。研究了铅芯橡胶支座、铅芯橡胶支座+黏滞阻尼器、摩擦摆支座三种隔震方案,对各方案均进行了相关的隔震支座设计,确定了各方案的支座及阻尼器的力学参数,通过选择合适的摩擦系数,可使摩擦摆支座在保证良好减震效果的同时也能更好地控制罕遇地震下变形,且耐久性较好。分析结果表明:摩擦摆支座方案可以达到铅芯橡胶支座+黏滞阻尼器方案的隔震效果,并且能使结构变形不至于过大。

The structural height of a college building is 23.5 m.The lower part of the building adopts concrete frame structure,and the upper part has a large-span steel truss spanning the teaching area structure at both ends.Three vibration isolation schemes of lead rubber bearing,lead rubber bearing with viscous damper and friction pendulum bearing were studied.The seismic isolation bearing design was carried out for all three schemes,and the mechanical parameters of the bearing and damper were determined.By selecting an appropriate friction coefficient,the friction pendulum bearing can better control the deformation under rare earthquakes while ensuring good shock absorption effect,and it has good durability.The analysis results show that the friction pendulum bearing scheme can achieve the isolation effect of lead rubber bearing+viscous damper scheme,and the deformation of the structure is not too large.