近场长周期地震动对减隔震连续梁桥的地震响应的影响研究

发布时间：2019-02-26 12:46

【摘要】：采用非线性时程分析方法,对比分析了常规地震动和近场长周期地震动作用下减隔震连续梁桥的地震响应。研究结果表明:地震动特性对桥梁的地震反应影响较大,地震动的卓越周期和桥梁的自振周期越接近,桥梁的地震反应越大;地震动的脉冲性越强烈,桥梁的地震反应越大。卓越周期和桥梁自振周期较接近的TCU052、TCU102和拥有强烈脉冲特性的TCU068地震动作用时,桥梁的地震响应明显增大,剪力和弯矩为常规地震动作用时的1.5~3.5倍,支座变形达到常规地震动作用时的2~8倍,近场长周期地震动可能引起减隔震桥梁更不利的地震反应。
[Abstract]:Based on the nonlinear time-history analysis method, the seismic responses of continuous beam bridges with seismic isolation under the action of conventional ground motion and near-field long-period ground motion are compared and analyzed. The results show that the seismic response of bridges is greatly affected by the characteristics of earthquake ground motion. The closer the dominant period of ground motion to the natural period of the bridge is, the greater the seismic response of the bridge is, and the stronger the impulse of ground motion is, the greater the seismic response of bridge is. When the dominant period and the natural vibration period of the bridge are close to the TCU052,TCU102 and the strong impulse characteristic of the TCU068 ground motion, the seismic response of the bridge increases obviously, and the shear force and bending moment of the bridge are 1.5 times as much as that of the conventional ground motion. The deformation of the support is 8 times higher than that of the conventional ground motion, and the near-field long-period ground motion may cause the seismic response of the seismic isolation bridge to be more unfavorable.
【作者单位】：南京工业大学土木工程学院;
【分类号】：U442.55

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