基础滑移隔震技术在刚构桥中的应用研究

发布时间：2018-08-30 14:40

【摘要】：近几年来，国内外地震频发，地震损失惨重。我国的抗震形式亦十分严峻，2008年5月12日发生的汶川大地震，造成了非常巨大的人员伤亡和经济损失，举世震惊。桥梁工程，作为震区交通线的枢纽工程，其抗震性能关系到抗震救灾工作的大局，受到极大关注。因此国内外工程师和学者们纷纷对桥梁的震害进行了认真系统的调查研究，并从不同角度提出了不同的抗震理念。鉴于基础隔震技术在房屋建筑领域的广泛运用，并取得的良好隔震效果，本文通过数值模拟对基础滑移隔震技术运用于等高墩连续刚构桥进行了技术研究，分析表明基础滑移隔震桥梁较非隔震桥梁也能取得良好的隔震效果。因此对基础滑移隔震连续刚构桥开展其抗震性能的研究具有重要的意义。本文以等高墩基础滑移三跨连续刚构桥为研究对象，对其地震响应及影响因素进行了研究，主要包括以下内容： 1.通过查阅文献，回顾了隔震技术的发展状况、分类及其优缺点；理论推导了基础滑移隔震刚构桥的运动方程，力学模型，以及滑移层的滞回曲线的选用，根据摩擦滑移的特性，选用刚塑性恢复力模型。 2.数值仿真方面，给出了地震波的选择原则以及滑移层的模拟方式，对比了基础滑移隔震桥梁与一般桥梁（基础固结）自振特性、地震响应的差异。 3.对基础滑移隔震桥梁的地震响应进行了参数研究，运用单一变量的方法，研究了不同摩擦系数、地震强度、墩高对地震响应的影响，，数据表明，基础隔震桥梁的地震响应对不同参数的敏感度不同，且呈现不同的规律性。 4.针对基础滑移隔震桥梁存在横向倾覆的风险，本文推导了横向抗倾覆的判别条件，并以特定案例给出了横向抗倾覆计算的简化思路。最后给出了横向抗倾覆的辅助设施—柔性锚固。
[Abstract]:In recent years, frequent earthquakes at home and abroad, earthquake losses. The earthquake in Wenchuan occurred on May 12, 2008, which caused tremendous casualties and economic losses, and shocked the whole world. Bridge engineering, as a hub project of seismic area communication line, its seismic performance is related to the overall situation of earthquake relief work, and has received great attention. Therefore, engineers and scholars at home and abroad have made a serious and systematic investigation and study on the earthquake damage of bridges, and put forward different seismic concepts from different angles. In view of the extensive application of foundation isolation technology in the field of building construction and the good isolation effect obtained, this paper makes a technical study on the application of sliding foundation isolation technology to continuous rigid frame bridge with constant height piers through numerical simulation. The analysis shows that the base sliding isolated bridge can also obtain good isolation effect. Therefore, it is of great significance to study the seismic behavior of continuous rigid frame bridge with sliding isolation. In this paper, the seismic response and the influencing factors of the three-span continuous rigid frame bridge with sliding foundation with equal height piers are studied. The main contents are as follows: 1. The development, classification, advantages and disadvantages of isolation technology are reviewed, and the motion equation, mechanical model and hysteretic curve of sliding layer are derived theoretically according to the characteristics of friction slip. Selection of rigid-plastic restoring force model. 2. In the aspect of numerical simulation, the selection principle of seismic wave and the simulation method of sliding layer are given, and the difference of natural vibration characteristics and seismic response between sliding isolated bridge and general bridge (foundation consolidation) is compared. 3. The influence of different friction coefficient, earthquake intensity and pier height on seismic response is studied by using single variable method. The seismic responses of base-isolated bridges have different sensitivity to different parameters and have different regularity. 4. In view of the risk of lateral overturning of sliding base isolated bridges, this paper deduces the discriminant conditions of lateral anti-overturning, and gives a simplified way of calculation of lateral anti-overturning in a special case. Finally, flexible Anchorage is given as the auxiliary device of lateral anti-capsizing.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23;U441.3

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