大高宽比高层剪力墙隔震结构抗倾覆性能研究

发布时间：2018-04-20 18:52

本文选题：高层剪力墙结构 + 基础隔震　；参考：《昆明理工大学》2017年硕士论文

【摘要】：针对大高宽比高层剪力墙隔震结构的抗倾覆性能,本文在理论推导的基础上,通过地震模拟振动台实验和数值模拟进行分析计算。考虑了支座竖向阻尼、结构转动动能对高层剪力墙隔震结构倾覆过程的影响,建立了简化分析模型及其动力微分方程,并针对高层剪力墙隔震结构推导了考虑转动动能的高宽比限值公式。为了验证高层剪力墙隔震结构的隔震效果以及抗倾覆性能,针对高宽比为3.96的高层剪力墙隔震结构进行振动台试验。总结了目前所广泛应用的主要时程分析方法,并基于Newmark-β法和变步长四-五阶龙格库塔法,推导了结合水平向采用Boucwen滞回模型的时程分析方法,利用MATLAB软件编制了时程分析程序,针对不同烈度、不同高宽比下的隔震层动力响应进行了数值计算分析。分析结果表明:1.隔震结构在平动和转动方向的位移响应存在惯性耦合现象,其转动位移对高频激励比较敏感,而水平位移在低频激励的作用下更为显著。2.通过对振动台试验结果分析,大高宽比剪力墙隔震结构具有明显的减震效果,上部结构侧移反应以平动为主,没有出现明显的薄弱层,隔震层在八度超罕遇地震作用下才出现了轻微的拉应力,但并未超过规范限值。结果表明大高宽比剪力墙隔震结构相比于大高宽比框架隔震结构,其抗倾覆性能更加明显,可以为高烈度区大高宽比隔震结构的推广提供参考。3.通过MATLAB程序分析了不同高宽比下隔震层动力响应,结果表明大高宽比剪力墙隔震结构在转动方向是一个动力过程、应充分考虑转动惯性力的影响;在特定烈度地震加速度作用下,隔震支座竖向应力状态随着高宽比(转动惯量)的增加会波动变化,也即隔震支座所处的拉压状态会随着高宽比增加而不断改变,因此高层剪力墙的转动惯性力对结构倾覆的约束作用不可忽视。
[Abstract]:In view of the overturning performance of high rise shear wall isolation structures with large aspect ratio, this paper, based on the theoretical derivation, analyzes and calculates by means of shaking table experiment and numerical simulation. Considering the influence of vertical damping and rotational kinetic energy on the overturning process of high-rise shear wall isolated structures, a simplified analytical model and its dynamic differential equation are established. The limit formula of aspect ratio considering rotational kinetic energy is derived for high rise shear wall isolated structures. In order to verify the isolation effect and capsize resistance of high-rise shear wall isolated structures, shaking table tests were carried out for high rise shear wall isolated structures with a aspect ratio of 3.96. Based on Newmark- 尾 method and variable step 4-5 order Runge-Kutta method, a time history analysis method combining horizontal hysteretic model with Boucwen model is derived, and a time history analysis program is compiled by using MATLAB software. The dynamic response of isolation layer with different intensity and aspect ratio is numerically calculated and analyzed. The result of analysis shows that 1: 1. The displacement response of isolated structures in the direction of translation and rotation is inertial coupling, and its rotational displacement is sensitive to high frequency excitation, while the horizontal displacement is more obvious under the action of low frequency excitation. Through the analysis of shaking table test results, it is found that the large aspect ratio shear wall isolated structure has obvious damping effect, the lateral displacement response of the superstructure is mainly translational, and there is no obvious weak layer. The isolated layer appeared slight tensile stress only under the action of octave earthquake, but it did not exceed the standard limit. The results show that the overturning performance of large aspect ratio shear wall isolation structure is more obvious than that of frame isolation structure with large aspect ratio, and it can provide a reference for the popularization of large aspect ratio isolation structure in high intensity region. The dynamic response of isolation layer under different aspect ratio is analyzed by MATLAB program. The results show that the large aspect ratio shear wall isolation structure is a dynamic process in the direction of rotation, and the effect of inertia force should be fully considered. Under the action of earthquake acceleration of specific intensity, the vertical stress state of the isolated bearing fluctuates with the increase of the aspect ratio (moment of inertia), that is, the tension and compression state of the isolation support will change with the increase of the aspect ratio. Therefore, the effect of rotational inertia force on the capsizing of tall shear wall can not be ignored.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.16

【参考文献】