附加粘滞阻尼器结构基于性能的抗震设计方法研究

发布时间：2018-11-14 09:16

【摘要】：消能减震结构是近年来各国都在研究的地震领域的一项新技术，消能减震结构是通过附加在结构上的消能装置来消耗水平地震作用或风作用下输入给结构的能量，从而达到抗震目的。基于性能的抗震设计是指结构所产生的最大变形不超过事先设定好的一个范围（即性能目标），通过合理的性能目标的选定，使得建筑结构的造价费用更为合理。结合消能装置，将其应用到基于性能的抗震设计理念中来，本文将二者结合，并且针平面对不对称结构，进行了以下研究工作。对于粘滞阻尼器的力学特性进行了简单的介绍，给出了粘滞阻尼器的各种力学模型，比较了非线性粘滞阻尼器和线性粘滞阻尼器的性能，介绍了非线性阻尼器的等效线性化原理。推导了线性粘滞阻尼器和非线性粘滞阻尼器的附加阻尼比计算公式。并对其他常见阻尼器进行简单介绍。研究了附加非线性粘滞阻尼器平面不对称结构基于性能的抗震设计方法，介绍了平面对称结构直接基于位移的抗震设计方法。将结构多自由度体系等效成为单自由度体系，然后由位移反应谱计算出单自由度体系在特定地震作用下，满足性能目标的总阻尼比，认为该阻尼比就是原结构所需的总阻尼比，从而计算出阻尼器所需提供的阻尼比，最后进行阻尼器设计。针对平面不对称结构，使用能力谱法，建立需求曲线与能力曲线，通过交点与目标位移的比较，计算出了结构满足性能目标的附加阻尼比。介绍了结构在两个方向上的阻尼系数的分配方式，，通过两条实际地震波和一条人工波对消能结构进行时程分析，用于验证能力谱法对于平面不对称结构的有效性。探索了附加粘滞阻尼器结构的位移响应计算方法，首先假定结构顶点位移，算出附加非线性阻尼器结构的总阻尼比，建立能力谱曲线与需求谱曲线，比较二者交点与假定的顶点位移的关系，若比较结果不接近，则重新假定结构顶点位移，进行反复迭代失算，直到假定的顶点位移与能力谱曲线和需求谱曲线的交点的位移接近为止。用此方法，计算多个模态下结构的顶点位移，最后通过CQC组合得出结构顶点的最终位移。并用三条地震波对效能结构进行时程分析，已验证该方法的有效性。
[Abstract]:The energy dissipation structure is a new technique in the field of earthquake which has been studied by many countries in recent years. The energy dissipation structure consumes the energy input to the structure by means of the energy dissipation device attached to the structure under the action of horizontal earthquake or wind. In order to achieve the purpose of earthquake resistance. Performance-based seismic design means that the maximum deformation produced by the structure does not exceed a predefined range (i.e., the performance target). Through the selection of reasonable performance objectives, the cost of the building structure is more reasonable. Combined with the energy dissipation device, it is applied to the performance-based seismic design concept. In this paper, the two methods are combined, and the asymmetric structure is studied in the needle plane. In this paper, the mechanical properties of viscous dampers are briefly introduced. Various mechanical models of viscous dampers are given, and the performances of nonlinear viscous dampers and linear viscous dampers are compared. The principle of equivalent linearization of nonlinear dampers is introduced. The formulas for calculating the additional damping ratio of linear viscous dampers and nonlinear viscous dampers are derived. The other dampers are introduced briefly. The performance-based seismic design method for planar asymmetric structures with nonlinear viscous dampers is studied. The displacement-based seismic design method for planar symmetric structures is introduced. The multi-degree-of-freedom system of a structure is equivalent to a single-degree-of-freedom system. Then the total damping ratio of the single-degree-of-freedom system under specific earthquake action is calculated by displacement response spectrum. It is considered that the damping ratio is the total damping ratio required by the original structure. The damping ratio of the damper is calculated and the damper is designed. According to the plane asymmetric structure, the capacity spectrum method is used to establish the demand curve and the capability curve. By comparing the intersection point with the target displacement, the additional damping ratio of the structure satisfying the performance objective is calculated. In this paper, the distribution of damping coefficient in two directions is introduced. Through the time-history analysis of two actual seismic waves and one artificial wave, the effectiveness of the capability spectrum method for plane asymmetrical structures is verified. In this paper, the method of calculating the displacement response of the structure with viscous dampers is explored. Firstly, the peak displacement of the structure is assumed, the total damping ratio of the structure with nonlinear dampers is calculated, and the capacity spectrum curve and the demand spectrum curve are established. The relationship between the intersection of the two points and the assumed vertex displacement is compared. If the comparison results are not close, then the structural vertex displacement is re-assumed and repeated iterative miscalculation is carried out. Until the assumed vertex displacement is close to the displacement at the intersection of the capacity spectrum curve and the demand spectrum curve. Using this method, the vertex displacement of the structure under multiple modes is calculated, and the final displacement of the structure vertex is obtained by CQC combination. The effectiveness of the method is verified by time history analysis of three seismic waves.
【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】：TU352.11

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