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带水平加强层的框—筒结构的受力性能分析
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摘要
众所周知,高层建筑物随着建筑高度的增加,其所受到的水平作用力对其的影响也会相对增大,导致其侧向位移也明显地增加。因此为了控制建筑结构因风荷载以及地震荷载对其位移的不利影响,结构的水平方向的变形已成为高层建筑结构中研究的主要课题之一。在近些年来,有些专家学者明确提出在框-筒结构中利用水平加强构件(即在内筒体和外框架柱之间采取设置刚度较大的水平伸臂大梁)来加强外框架柱和内筒体的相互作用,达到很好地控制其侧向变形的目的。对结构采取设置水平加强构件的措施,对减小风荷载和地震荷载下结构的侧向位移能够起到非常好的效果,但是,在地震作用下,水平加强层的设置,会引起结构内力以及结构的刚度突变,比较容易形成薄弱环节,往往使结构的损坏机制很难呈现延性屈服机制。
     在本文中,运用有限元软件ANSYS,对框-筒结构设置不同的水平加强层方案,通过改变加强层处周边框架梁的尺寸,建立有限元分析模型。应用有限元分析软件ANSYS对不同的结构方案进行模态分析,比较两者的自振周期和振型特点。然后采用时程分析法对不同结构进行水平地震动力分析,比较和总结了不同水平加强层设置方案下,结构的位移、内力的响应规律;分析了设置加强层后高层建筑结构体系受力特征变化的规律,总结了水平加强层减小结构侧移,提高结构抗侧刚度的机理,为此类结构的抗震设计提供一定的参考建议。
It is well known that impact on level load increases accordingly, and sidewisedisplacement improves quickly, with the height updating of high-story buildingHence,control of sidewise distortion of high-story building under the role of seismicload and wind load turns into a significant subject of research on high-storybuilding.In recent years,some scholars have put forward that the strengthened storystructure should be used in reinforcing the collaborative role between tube structureand the columns in the ambient story to command sidewise shape, accordingly to putlevel bracket with rigid number between the tube and the columns. or setcircumambient region with rigid quality along the lesser frame, which is the mostsimply used structural form of frame-tube wall form with level strengthened story.It isan effective step to stop the form level-moving oppose the influence of the wind bysetting the level strengthened story.When the effect of earthquake occur.It will leadto an unexpected change in the stiffness and internal force of the structure,and lead tocompose a lepto layer, which will cause it tricky for the inside mechanism of thestructure to implement its expansion bending system.
     In this paper, the large-scale finite element software ANSYS, which is resettled toestablish the finite element analysis model according on the basis of the setting schemeof the frame-tube structure with various level strengthened story.Then, we adoptedthe time-history analysis method to analyze the level seismic power for variousstructures,and a summarize and compare seismic response of displacement period,response inherent force of structure with different level enhanced story, summarizemechanics of reduction of level displacement and improvement of level resistant andrigidity of structure on the basis of the level seismic analysis,and also provide somesuggestions for the seismic design for the same structure for reference.
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