带水平加强层的高层混合结构抗震性能分析及振动台试验研究

发布时间：2018-04-10 12:53

  本文选题：高层混合结构 + 水平加强层　； 参考：《兰州理工大学》2013年博士论文

【摘要】：高层混合结构是由钢框架(或型钢混凝土框架、钢管混凝土框架)与钢筋混凝土筒体(或型钢混凝土筒体)组合而成,随着建筑高度的增加,需设置水平加强层(一般为伸臂桁架),这种结构体系在高层及超高层建筑中应用越来越多,但是关于该种结构体系在地震作用下的反应研究并不够深入,存在理论落后于实践的问题。本文以兰州红楼时代广场(典型的框架-核心筒-伸臂桁架加强层结构体系)为研究背景,对该种结构体系的抗震性能及振动台试验进行了研究,完成的工作和取得的主要成果如下： (1)系统总结了国内外关于型钢混凝土剪力墙试验的结果,将型钢混凝土剪力墙的破坏划分为三个阶段,理论推导的同时加以试验数据的回归修正,得到了型钢混凝土剪力墙的骨架曲线,最后结合试验结果提出了四折线考虑刚度退化的定点指向型恢复力模型。该恢复力模型计算参数物理意义明确,便于计算机的程序化,可以为钢骨混凝土剪力墙结构的弹塑性动力分析提供一定的参考。采用OpenSEES中的纤维单元,并考虑剪切作用的影响,对型钢混凝土剪力墙进行了水平往复荷载作用下的滞回性能分析。将本文的滞回模型、纤维模型计算值与试验数据进行比较,三者吻合较好,表明本文提出的恢复力模型的可靠性。 (2)从方钢管混凝土柱的截面层次出发,结合试验结果,将构件的破坏分为了两个阶段,理论推导了构件的骨架曲线,得出了方钢管混凝土柱的三折线滞回模型。最后利用OpenSEES软件中的纤维梁柱单元,对方钢管混凝土柱进行了水平往复荷载作用下的滞回性能分析。将本文的滞回模型、纤维模型计算值与试验数据进行比较,三者吻合较好,表明本文提出的恢复力模型的可靠性。 (3)通过对伸臂桁架加强层受力机理的分析,将加强层模型简化为悬臂式格构钢柱模型,以结构顶点位移为控制指标,分析了伸臂梁的抗弯刚度、桁架腹杆的轴向刚度的变化对结构侧移的影响,提出了伸臂梁抗弯刚度与剪力墙抗弯刚度之比α、桁架腹杆轴向刚度与框架柱轴向刚度之比β的量化指标。最后通过两个工程案例,得出设置一道伸臂桁架加强层时线刚度比α的最优范围为0.25～1.0,β的最优范围为1.0～4.0；设置两道伸臂桁架加强层时线刚度比α的最优范围为0.25～1.0,β的最优范围为1.0～3.0；对于设置两道伸臂桁架加强层的结构,增加下部加强层伸臂梁抗弯刚度增加对结构抗侧移的效果明显优于增加上部加强层伸臂梁抗弯刚度的效果 (4)通过对静力弹塑性分析及动力弹塑性分析原理及方法的研究,总结了两种分析方法目前存在的问题,并对静力弹塑性的单一模态推覆分析做了改进,推导了多模态推覆分析的方法。结合本文研究背景的工程实例,分别对其进行了静力及动力弹塑性分析。通过对该结构不同加载模式的对比分析,得出不同的加载模式,结果相差较大,建议实际工程的设计分析宜采用多种加载模式进行综合判别；多模态推覆分析考虑了高阶振型的影响结果,对于高阶振型占主要作用的结构宜采用多模态推覆分析的方法；结构动力弹塑性分析,能够得到结构在罕遇地震作用下的弹塑性变形,但受所选地震波的影响比较大,需与静力弹塑性分析相结合,对结构的抗震性能做出综合判定。 (5)以兰州红楼时代广场为原型,进行了1：25比例缩尺模型的振动台地震模型试验,试验的加速度相似比为1.6：1,模型结构经历了相当于8度小震到8度大震的单向及双向水平地震动输入,得到了结构在各强度地震作用下的层间位移、层间加速度、层间剪力等的分布规律。通过有限元软件模拟与试验结果的对比分析,分析并总结了结构在试验时各工况下的试验现象,找出各种现象出现的原因。结合软件计算结果,综合判断了结构的薄弱部位,并给出相应的加强措施,可以为此类结构体系在高烈度区的设计和应用提供参考。
[Abstract]:The high - rise hybrid structure is composed of steel frame ( or SRC frame , steel tube concrete frame ) and reinforced concrete cylinder ( or section steel concrete cylinder ) . As the height of the building increases , the horizontal reinforcing layer ( usually extension arm truss ) needs to be provided . However , the research on seismic behavior and vibration table test of this kind of structural system has been studied .

( 1 ) The system summarizes the results of the test of SRC shear wall at home and abroad , and divides the damage of SRC shear wall into three stages . At the same time , the skeleton curve of SRC shear wall is obtained . Finally , the hysteretic behavior of SRC shear wall is analyzed by using the fiber unit in OpenSEES . The hysteretic model and the calculated value of the fiber model are compared with the test data .

( 2 ) Based on the cross - sectional level of the square - filled steel tube concrete column , the damage of the component is divided into two stages according to the experimental results , the skeleton curve of the component is deduced , and the hysteretic behavior of the square - filled steel tube concrete column is obtained . Finally , the hysteretic model is made by using the fiber beam - column unit in the OpenSEES software , the calculated value of the fiber model is compared with the test data , and the three are in good agreement with each other , indicating the reliability of the restoring force model proposed herein .

( 3 ) The reinforcement layer model is simplified into cantilever type lattice steel column model by analyzing the stress mechanism of reinforcing layer of extension arm truss .
the optimal range of the linear stiffness ratio is 0.25 - 1.0 and the optimal range of beta is 1.0 - 3.0 ;
For the structure of the reinforced layer with two extension arms , the effect of increasing the bending stiffness of the lower reinforcing layer extension arm beam on the lateral displacement of the structure is obviously better than the effect of increasing the bending stiffness of the upper reinforcing layer extending arm beam .

( 4 ) Through the research on the theory and method of elastic - plastic analysis and dynamic elastic - plastic analysis of static force , the problems existing in two methods are summarized , and the method of multi - modal push - over analysis is deduced .
The multi - modal push - over analysis takes into account the influence of higher - order modes , and the multi - modal push - over analysis method is suitable for the structure of higher - order modes .
The elastic - plastic deformation of the structure can be obtained by the elastic - plastic analysis of the structure , but the elastic - plastic deformation under the action of the earthquake can be obtained , but the influence of the selected seismic wave is relatively large , and the seismic performance of the structure is comprehensively determined by combining with the static elastic - plastic analysis .

( 5 ) Based on the prototype of the Times Square of Honglou , Lanzhou , the seismic model test of 1 鈭，

本文编号：1731284