基底摇摆隔震在双肢薄壁高墩刚构桥中的应用

发布时间：2018-11-04 17:02

【摘要】：研究基底摇摆隔震在高墩大跨连续刚构桥中的应用,包括减隔震装置的原理、力学模型、参数确定以及在有限元中的实现。利用耐震时程法分析基底摇摆隔震的优缺点,为工程应用提供参考。结果表明:采用基底摇摆隔震的高墩刚构桥在同一地震作用下桥墩最大转角、弯矩都比未采用隔震时小,隔震效果明显;地震强度较低时,采用摇摆隔震后的桥梁端支座位移与未采用隔震时相差很小,中跨跨中弯矩也相差很小;地震强度较高时,采用摇摆隔震后的梁端支座位移、中跨跨中弯矩都比未采用隔震时大,尤其是中跨跨中弯矩相差甚大,因此对于高烈度地带超高刚构桥地震采用摇摆隔震有待深入研究。
[Abstract]:The application of base rocking isolation in long-span continuous rigid frame bridge with high piers is studied, including the principle of isolation device, mechanical model, parameter determination and its realization in finite element method. The merits and demerits of base rocking isolation are analyzed by means of seismic time-history method, which provides a reference for engineering application. The results show that the maximum rotation angle and bending moment of high pier rigid frame bridge with base rocking isolation under the same earthquake are smaller than those without isolation, and the isolation effect is obvious. When the earthquake intensity is low, the displacement of the end support of the bridge with rocking isolation is very small compared with the one without isolation, and the difference of bending moment between the middle span and the middle span is also very small. When the earthquake intensity is high, the mid-span bending moment of the beam with rocking isolation is larger than that of the middle span, especially the middle moment of the mid-span is very different. Therefore, the use of rocking isolation for super rigid frame bridges in high intensity zone needs further study.
【作者单位】：交通运输部公路科学研究所;北京工业大学工程抗震与结构诊治北京市重点实验室;温州市高速公路工程有限公司;
【基金】：国家自然科学基金(51378037;51378039;91315301-03)
【分类号】：U442.55;U448.23

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