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传统烟风道板式滑动支座可减少道体热胀冷缩时的摩擦阻力,但抗震耗能能力不足,缺少变形后的复位能力,且会约束道体的转动而可能导致结构破坏.将摩擦摆隔震支座用于烟风道,可同时具有热滑移、隔震功能,允许道体在温度作用下自由转动.本文对烟风道采用双凹摩擦摆中间隔震的结构体系地震响应进行了研究,建立了横向地震作用下简化的三自由度地震响应分析模型,其中双凹摩擦摆采用三线性滞回模型,推导了一阶状态空间微分运动方程.该模型的分析结果与有限元实体模型分析结果非常接近.利用简化模型研究了不同场地类别、不同强度地震激励作用下双凹摩擦摆的恢复力特点及隔震效果,结果表明:与非隔震结构相比,双凹摩擦摆隔震的烟风道的道体反力、支架剪力均得到了控制.
The traditional smoke duct slide support can reduce the frictional resistance of the road when it expands and contracts, but the seismic energy-dissipation capacity is insufficient, the ability to reset after deformation is lacking, and the rotation of the road body can be restrained and the structure may be damaged. The pendulum bearing is used for the smoke duct, which can simultaneously have thermal slippage and isolation function, allowing the body to rotate freely under the action of temperature.A seismic response A simplified three-degree-of-freedom seismic response analysis model is established, in which the bilinear friction wobbler adopts the trilinear hysteretic model to derive the first-order state-space differential equation of motion. The analytical results of this model are compared with the finite element The results of solid model analysis are very close to each other.Using the simplified model, the restoring force and isolation effect of biconcrated friction pendulum under different kinds of earth motions under different intensities of earthquake excitation are studied. The results show that compared with non-isolated structure, Isolation of the smoke duct road body reaction, stent shear have been controlled.