近断层地震动作用下多塔斜拉桥结构减震控制研究

发布时间：2018-03-25 17:11

本文选题：多塔斜拉桥　切入点：结构减震控制　出处：《东南大学》2015年博士论文

【摘要】：多塔斜拉桥结构的抗震性能与减震控制是目前国内外学术界与工程界的热点研究领域。为了保障多塔斜拉桥结构的抗震安全性,需要结合多塔斜拉桥的自身力学特性及其地震动特性展开深入的研究。本文围绕近断层地震动作用下多塔斜拉桥抗震安全这个主题,从多塔斜拉桥地震动强度指标、多塔斜拉桥结构抗震性能、多塔斜拉桥结构振动控制特性、多塔斜拉桥结构被动优化控制方法以及结构混合控制方法等5个方面较系统地开展近断层地震动作用下多塔斜拉桥结构减震控制研究,本文的主要工作和成果如下：1、开展了近断层地震动作用下结构地震动强度指标研究。提出了近断层地震动作用下适用于中长周期结构的地震动强度指标,结合最不利设计地震动概念,提出了适用于中长周期结构的最不利设计近断层地震动。在此基础上,针对不同场地条件及结构自振周期分别给出了7组最不利设计近断层地震动用于中长周期结构的动力时程分析。2、开展了近断层地震动作用下多塔斜拉桥抗震性能研究。重点讨论了近断层地震动作用下多塔斜拉桥采用纵向部分固结体系和纵向全自由体系的地震反应特点,明确了多塔斜拉桥采用不同纵向结构体系的主要控制目标。研究结果表明：近断层地震动作用下多塔斜拉桥采用纵向部分固结体系的主要控制目标是减小塔梁纵向固结处过大的塔底纵向内力,而纵向全自由体系主要是减小过大的塔底纵向弯矩、塔顶纵向位移以及塔梁和墩梁纵向相对位移。3、开展了近断层地震动作用下多塔斜拉桥振动控制特性研究。重点分析了近断层地震动作用下多塔斜拉桥不同纵向结构体系采用粘滞阻尼器和弹性拉索的振动控制特性,明确了近断层地震动作用下多塔斜拉桥不同纵向结构体系的适宜被动控制装置。研究结果表明：粘滞阻尼器应用于多塔斜拉桥纵向部分固结体系的减震控制效果优于弹性拉索,而粘滞阻尼器和弹性拉索都适用于多塔斜拉桥纵向全自由体系的减震控制。4、开展了近断层地震动作用下多塔斜拉桥被动控制方法研究。首先联合应用响应面法与多目标遗传算法提出了近断层地震动作用下多塔斜拉桥结构减震优化控制方法。在此基础上,针对多塔斜拉桥纵向部分固结体系塔底纵向内力控制的矛盾性,建立了采用粘滞阻尼器的被动控制优化分析方法；针对多塔斜拉桥纵向全自由体系提出了粘滞阻尼器和弹性拉索综合控制体系及其两阶段优化分析方法。5、开展了近断层地震动作用下多塔斜拉桥混合控制方法研究。采用经典线性最优控制算法和限界Hrovat最优控制算法开展了基于MR阻尼器的多塔斜拉桥半主动控制分析,给出了纵向部分固结体系和纵向全自由体系的最优半主动控制方案。在此基础上提出了多塔斜拉桥混合控制系统以“被动控制为主、半主动控制为辅”的设计策略,建立了多塔斜拉桥纵向部分固结体系和纵向全自由体系的混合控制方法。
[Abstract]:The seismic performance and vibration control of cable-stayed bridge is currently a hot research field in domestic and foreign academia and engineering. In order to ensure the seismic safety of the cable-stayed bridge structure, need to combine its own characteristics and mechanics to cable-stayed bridge vibration characteristics in-depth research. This paper focuses on the near fault ground motion. Under the theme of cable-stayed bridge seismic safety, the cable-stayed bridge seismic strength index, cable-stayed bridge structure seismic performance, control characteristics of multi tower cable-stayed bridge structure vibration, 5 aspects of cable-stayed bridge structure optimization of passive hybrid control method and structure control method to systematically carry out near fault ground motions under the action of multi tower cable-stayed bridge structure vibration control research, the main work and achievements are as follows: 1, structure seismic intensity index of the near fault ground motion is proposed. The near fault The vibration intensity index level seismic for long period structure, with the most unfavorable seismic design concept, put forward the most unfavorable design for long period structure of near fault ground motions. Based on this, for power in long period structures, different site conditions and structural vibration period respectively given the 7 groups of the most unfavorable design of near fault ground motion time history analysis of.2, study on the seismic performance of cable-stayed bridge under the action of the near fault ground motions are discussed. Under the action of multi tower cable-stayed bridge by using seismic response characteristics of vertical part consolidation system and full longitudinal free system of near fault ground motion, the main the control target with different vertical structure system of cable-stayed bridge. The results show that the main control objectives of near fault ground motion under the action of multi tower cable-stayed bridge with longitudinal section consolidation system is reducing the turret At the large longitudinal beam consolidation bottom longitudinal internal force, and the longitudinal free system is reducing the excessive longitudinal bending moment of tower bottom, the longitudinal displacement and tower girder and pier beam longitudinal displacement of.3, under the action of multi tower cable-stayed bridge vibration control was carried out to study the characteristics of near fault ground motions. Focus on the analysis of the characteristics of vibration under the control of multi tower cable-stayed bridge with different longitudinal structure with viscous dampers and elastic cables near fault ground motion, the near fault ground motion under the action of multi tower cable-stayed bridge with different longitudinal structure suitable for passive control devices. The results show that the vibration control effect is better than that of elastic cable viscous damper used in cable-stayed bridge the longitudinal part consolidation system, while the viscous and elastic cables are suitable for cable-stayed bridge longitudinal vibration control system of the free.4, the near fault ground motion. Passive control method of multi tower cable-stayed bridge. The combined application of response surface method and multi-objective genetic algorithm is presented for near fault ground motions under the action of multi tower cable-stayed bridge structure vibration control optimization method. On this basis, the cable-stayed bridge longitudinal section of tower bottom longitudinal contradiction consolidation system of internal control, established by the optimization method of passive control of viscous damper; multi tower cable-stayed bridge for the full longitudinal free system put forward the comprehensive control system of viscous damper and elastic cable and two phase optimization method of.5, the near fault earthquake under the action of multi pylon cable stayed bridge hybrid control method research. Using the classical algorithm and bound Hrovat optimal control algorithm is carried out MR damper cable-stayed bridge analysis of semi-active control based on linear optimal control, given the longitudinal part consolidation system and vertical free system The optimal active control scheme. The half is proposed based on the hybrid control system based on passive control of cable-stayed bridge, the design of semi-active control strategy supplemented by "the established method of hybrid control system and the vertical longitudinal section consolidation system of cable-stayed bridge.

【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：U442.55;U448.27

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