既有建筑与加装电梯的可滑移节点抗震研究

Study on the Seismic Performance of Slippable Joints of Existing Buildings and Elevators

新型可滑移节点能显著提高减震效应,有效改善既有建筑加装电梯的抗震性能。本文提出的新型可滑移节点模型,利用高强螺栓、长圆孔板和橡胶垫将电梯入户平台与既有建筑进行连接,目的是通过螺栓与长圆孔板以及垫板与橡胶垫之间的摩擦进行耗能,抵抗地震作用,减小结构变形。为研究该节点的受力情况,本文设计并完成了4个试件位移加载实验,实验的主要变化参数为底座是否有橡胶以及螺栓的开孔形状。实验结果表明:传统节点的最大耗能系数为0.62,可滑移节点的最大耗能系数为1.45,螺栓开孔形状对试件的性能影响明显,增加橡胶垫使试件耗能增大,可滑移节点试件抗震能力较传统节点有所提高,充分发挥了结构的耗能能力。进一步的参数分析表明:橡胶垫和开孔形状明显影响试件的变形能力,新型可滑移节点滞回曲线比较饱满,表现出一定的“捏缩”现象,整个结构具有良好的抗震性能和耗能能力,实验结果和有限元分析结果吻合良好。

The new slippable node can significantly improve the damping effect,and effectively improve the seismic performance of existing buildings with elevators.The new slippable node model proposed in this paper is to connect the elevator entry platform with the existing building by using high-strength bolts,circular orifice plates and rubber pads.The purpose is to dissipate energy through the friction between bolts and circular orifice plates and the cushion plate and rubber pad,resist seismic action and reduce structural deformation.In order to study the stress of this joint,the displacement loading test of 4 specimens is carried out in the paper.The main parameters of the test are whether there is a rubber pad in the base and the hole shape of the bolt.The experimental results show that the maximum energy dissipation of the traditional node is 0.62,and the maximum energy dissipation of the slippable node is 1.45.The shape of the bolt hole has a significant impact on the performance of the specimen.The addition of rubber pad increases the energy dissipation of the specimen,and the seismic resistance of the slippable node specimen is improved compared with the traditional node,giving full play to the energy dissipation capacity of the structure.The parametric analysis shows that the rubber pad and the shape of the hole obviously affect the deformation ability of the specimen.The hysteretic curve of the new slippable joints is relatively full,showing a certain"pinch"phenomenon.The whole structure has good seismic performance and energy dissipation capacity.The test results are in good agreement with the finite element analysis results.