板式连接中心支撑钢框架结构的抗震性能研究

发布时间：2018-03-05 04:28

本文选题：中心支撑钢框架　切入点：抗震性能　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：板式连接铰接中心支撑钢框架结构的节点设计、加工和安装简单方便。支撑与梁、柱采用节点板连接,不但传力明确,构造简单,具有一定的耗能能力,而且更加接近于两端铰接、以受轴力为主的情况,同时该体系在高烈度区也具有良好的抗震性能。但是我国相关规范中对于板式连接中心支撑钢框架的设计条款并不完善,国内对这种结构的抗震性能尚没有系统、深入的研究。本文针对使用板式连接节点的中心支撑钢框架结构,通过抗震试验研究和ABAQUS有限元分析相结合的方法,获得结构体系的地震反应特性、极限荷载及延性水平,检验构件、节点等构造措施的合理性,研究节点板附近梁、柱上附加弯矩的变化规律,验证节点板上支撑端部净距对支撑与节点板寿命的影响。主要内容如下:1.基于中心支撑钢框架以及板式连接节点的抗震设计方法,确保强节点、弱构件的抗震设防原则,按1:4缩尺设计3层振动台试验模型和按1:2.6缩尺设计两榀3层推覆试验模型,考虑了支撑长细比、板件宽厚比、节点板在支撑端部净距等关键参数的影响。2.对振动台试验模型进行24种地震动工况的模拟振动台试验,获得了结构的位移及加速度响应、动力特性、结构的破坏模式、梁柱及节点板关键点的应变数据、支撑的平面外和轴向变形以及支撑的轴力等。分析了结构的抗震性能、梁柱上附加弯矩的大小和变化规律,验证了支撑板式节点连接抗震设计方法的合理性。3.使用ABAQUS有限元程序,建立振动台试验试件的的壳单元模型,模拟振动台试验结果;将有限元计算结果与模拟振动台试验结果进行对比和补充,分析二者的异同,验证有限元模拟的可靠性,为空间模型的整体分析提供依据。4.对两榀3层板式连接铰接中心支撑钢框架模型进行静力推覆试验。获得了结构的破坏模式、荷载与层间侧移曲线、关键节点上的热点应变、支撑的面外及轴向变形、支撑的轴力等关键数据。分析了结构的极限承载力、延性水平、结构影响系数、破坏顺序以及梁柱上附加弯矩的大小和变化规律。5.总结前人关于板式连接节点铰接框架梁柱上附加弯矩的有限元模拟及试验结果,提出梁柱上附加弯矩指数的设计建议取值,并利用本文试验实测值进行验证,保证取值的可靠性。
[Abstract]:The joint design, processing and installation of the steel frame structure with plate connection hinge center are simple and convenient. The connection of support, beam and column with joint plate not only has clear force transfer, simple construction, but also has certain energy consumption ability. Moreover, it is closer to the two ends of hinged joints and is mainly subjected to axial force. At the same time, the system also has good seismic performance in the high intensity region. However, the design provisions of the steel frame with plate connection center support in the relevant codes of our country are not perfect. The aseismic performance of this kind of structure has not been systematically studied in our country. In this paper, the method of combining seismic test and ABAQUS finite element analysis is used for the steel frame structure with central braced frame with plate connections. The seismic response characteristics, ultimate load and ductility level of the structure system are obtained, and the rationality of structural measures such as members and joints are examined. The variation law of additional bending moment on the column and beam near the joint plate is studied. The main contents are as follows: 1. Based on the seismic design method of central braced steel frame and plate connections, the seismic fortification principle of strong joints and weak members is ensured. A three-story shaking table test model is designed according to 1: 4 scale and two three-story nappe test models are designed according to 1: 2.6 scale. The ratio of supporting length to thickness and the ratio of width to thickness of plate are taken into account. The influence of the key parameters such as the net distance of the joint plate in the support end. 2. The shaking table test was carried out on the shaking table test model under 24 kinds of ground motion conditions, and the displacement and acceleration response, dynamic characteristics and failure mode of the structure were obtained. The strain data of Liang Zhu and the key points of the joint plate, the out-of-plane and axial deformation of the brace and the axial force of the bracing are analyzed. The aseismic performance of the structure, the magnitude and variation law of the additional bending moment on Liang Zhu are analyzed. The rationality of seismic design method of braced plate joint connection is verified. Using ABAQUS finite element program, the shell element model of shaking table test specimen is established, and the results of shaking table test are simulated. The finite element calculation results are compared with the simulated shaking table test results, the similarities and differences between them are analyzed, and the reliability of the finite element simulation is verified. This paper provides the basis for the overall analysis of the spatial model. 4. Static and force push-over tests are carried out on two steel frame models with three laminated hinged central braces. The failure mode of the structure, the load and interstory lateral displacement curves, the hot spot strain at the key joints are obtained. The key data such as out-of-plane and axial deformation of bracing, axial force of bracing and so on are analyzed. The ultimate bearing capacity, ductility level, influence coefficient of structure are analyzed. Failure sequence and the magnitude and variation of additional moment on Liang Zhu .5.Summing up the finite element simulation and experimental results of previous researches on the additional moment of plate joint hinge frame Liang Zhu, and putting forward the suggested design value of additional moment index on Liang Zhu. The experimental data are verified by this paper to ensure the reliability of the values.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.11;TU391

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