滑移隔震框架结构模型设计与分析

发布时间：2018-05-11 16:36

本文选题：摩擦滑移 + 基础隔震　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：滑移隔震技术是减小地震对上部结构影响的主要隔震方法之一，隔震效果较好，但目前对其隔震性能的研究尚有一些欠缺。因此，本文设计了一个2跨5层的滑移隔震框架计算模型结构，设计制作了与之对应的缩尺试验模型结构，并以SAP2000有限元分析为基础，，研究了滑移隔震框架结构的隔震性能。主要工作和研究内容如下：（1）为研究结构质量对结构振动特性、楼层层间剪力和柱子底部压力等参数的影响，以准确建立框架结构的动力计算模型，文中设计了一个2跨5层的滑移隔震框架计算模型结构，并建立了相应的SAP2000有限元分析模型。通过采用软件中定义的框架结构质量源4种计算方法的分析比较，探讨了该模型结构的自振周期、楼层层间剪力和柱子底部压力的变化情况，为进一步分析提供了依据。（2）为研究摩擦摆基础滑移隔震框架结构的隔震性能，以上述隔震框架计算模型和相应抗震结构模型为研究对象，采用有限元软件SAP2000进行建模、工况定义、模型计算分析和数据提取等，分析了基础滑移隔震结构和相应抗震结构在地震作用下的自振周期、楼层最大加速度响应、层间位移和层间剪力等，比较了2种模型结构的地震响应，探讨了摩擦摆的隔震效果。结果表明，通过合理设置摩擦摆的性能参数，滑移隔震框架结构的减震效果比较明显，能够显著降低结构的加速度响应、层间位移和层间剪力等，其中加速度响应的减震效果达到了90%。（3）为研究摩擦滑移隔震板隔震层刚度对基础隔震框架结构计算模型隔震性能的影响，寻求滑移隔震层的合理刚度，根据摩擦滑移隔震板试验得到的摩擦滑移特性，采用SAP2000软件进行建模和分析，比较了隔震层上部设置刚性底板和柱根直接设置隔震支座2种情况的隔震效果。结果表明，设置刚性底板隔震框架结构隔震层的刚度易于控制，并且能够有效控制基底的最大滑移量。当计算模型结构隔震层刚度为2000kN/m左右时，隔震效果较好，可显著降低框架结构的层间位移、层间剪力和加速度响应等，一般情况下可降低70%。（4）采用一致相似率，进行上述隔震框架计算模型结构的模拟地震振动台试验模型结构设计，介绍了模型设计的基本过程。采用双层底盘设计方法，进行了试验模型结构配筋面积等效和模型结构人工质量等效计算等。结果表明，人工质量块设置在7-8t范围内比较合理，以此求出的模型相似关系比较恰当，便于实现，其中加速度相似系数在2-3之间，能够较好地减小试验模型结构的重力失真效应，减小噪声影响和试验误差，较好地反映计算模型结构的地震响应特性。此外，试验模型结构隔震层刚度宜取250kN/m-500kN/m，此时隔震结构的自振周期为抗震结构的2-3倍。
[Abstract]:Sliding isolation technology is one of the main isolation methods to reduce the impact of earthquake on the upper structure, and the effect of isolation is good, but there are still some deficiencies in the study of its seismic isolation performance. Therefore, this paper designs a model structure of 2 span and 5 story sliding isolation frame, and designs and produces a scale test model corresponding to it, and SAP200 0 based on the finite element analysis, the isolation performance of the sliding isolation frame structure is studied. The main work and research contents are as follows:
(1) in order to study the influence of structural quality on structural vibration characteristics, floor interlayer shear and column bottom pressure and so on, the dynamic calculation model of frame structure is established accurately. In this paper, a calculation model structure of sliding isolation frame with 2 span and 5 layers is designed, and the corresponding SAP2000 finite element analysis model is established. The analysis and comparison of the 4 calculation methods of the frame structure quality source have been made to discuss the self vibration period of the structure, the shear force of the floor and the pressure of the bottom of the column, which provide the basis for further analysis.
(2) in order to study the seismic isolation performance of the sliding base sliding isolation frame structure, taking the above seismic isolation frame calculation model and the corresponding seismic structure model as the research object, the finite element software SAP2000 is used to model the model, the working condition definition, the model calculation analysis and the data extraction, and the basic sliding isolation structure and the corresponding seismic structure are analyzed in the earthquake. The seismic response of the 2 model structures is compared and the seismic response of the friction pendulum is discussed. The results show that the damping effect of the sliding isolation frame structure is obvious and the structure can be significantly reduced by the reasonable setting of the performance parameters of the friction pendulum. Velocity response, interlayer displacement and interlaminar shear force, and so on, the acceleration response has a 90%. reduction effect.
(3) in order to study the influence of the stiffness of the seismic isolation plate isolation layer on the seismic isolation performance of the base isolation frame structure, the rational stiffness of the sliding isolation layer is sought and the friction slip characteristics obtained by the friction sliding isolation plate test are modeled and analyzed by SAP2000 software, and the rigid floor and column root are set up in the upper part of the isolation layer. The results show that the stiffness of the seismic isolation layer with rigid base isolation frame is easy to control and can effectively control the maximum slip of the base. When the stiffness of the model structure is about 2000kN/m, the seismic isolation effect is better and the interlayer displacement of the frame structure can be significantly reduced. Interlaminar shear and acceleration responses can generally reduce 70%.
(4) the structure design of the simulated seismic shaking table model is designed with the same similarity rate, and the basic process of the model design is introduced. Using the double deck chassis design method, the equivalent reinforcement area of the experimental model and the artificial mass equivalent calculation of the model structure are carried out. The results show that the artificial mass is the artificial mass. The block setting is more reasonable in the range of 7-8t, and the model similarity relation is more appropriate and easy to be realized. The acceleration similarity coefficient is between 2-3, which can reduce the gravity distortion effect of the model structure well, reduce the noise influence and test error, and better reflect the seismic response characteristic of the model structure. In addition, try to test the seismic response characteristics of the model structure. The stiffness of the isolation layer is 250kN/m-500kN/m, and the natural vibration period of the isolation structure is 2-3 times that of the seismic structure.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.12;TU375.4

【参考文献】