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水平荷載作用下高層剪力墻結(jié)構無害層間位移分析

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  本文選題:高層建筑 切入點:剪力墻結(jié)構 出處:《華僑大學》2013年碩士論文


【摘要】:高層建筑結(jié)構設計關鍵在于控制水平側(cè)移,層間位移是反映結(jié)構變形的一個重要指標。國家規(guī)范對樓層最大層間位移與層高之比的限值作出了規(guī)定。但是對于高層剪力墻結(jié)構,根據(jù)高寬比的不同,在水平荷載作用下的變形曲線是彎剪型或彎曲型的,,其層間位移不僅包含了由于構件受力產(chǎn)生的位移,還包含了由于結(jié)構整體彎曲產(chǎn)生的位移(無害層間位移),并且隨著樓層的增加,無害層間位移在層間位移中所占的比例越來越大。為了使包含無害層間位移的層間位移滿足國家規(guī)范的限值,結(jié)構設計人員不得不加大結(jié)構剛度,其直接后果是結(jié)構的地震反應加大,不僅造成經(jīng)濟上的浪費,而且對結(jié)構抗震不利。 文中重點討論了以下內(nèi)容:(1)結(jié)構層間位移的組成,有害層間位移和無害層間位移的概念,以及無害層間位移的計算方法。(2)從工作十年來所有主持設計和參與設計的高層結(jié)構的實際工程,選取其中典型的9幢高度在100m左右、高寬比在3~8之間的高層剪力墻結(jié)構,分析其最大層間位移出現(xiàn)的規(guī)律。(3)利用有限元分析軟件ETABS (9.7.1),分別建立了4個不同高度、不同高寬比的高層剪力墻結(jié)構模型,計算結(jié)構在水平荷載作用下的側(cè)向位移、層間位移、有害層間位移和無害層間位移。(4)分析無害層間位移隨結(jié)構高度和高寬比變化的規(guī)律、無害層間位移增長速度沿樓層變化的規(guī)律、以及在層間位移最大樓層處無害層間位移占層間位移的比例。(5)統(tǒng)計了最大有害層間位移出現(xiàn)的樓層范圍,建議采用結(jié)構的有害層間位移為控制側(cè)移剛度的指標,并可結(jié)合舒適度要求,控制結(jié)構頂點加速度。
[Abstract]:The key of high-rise building structure design is to control horizontal lateral displacement, and interstory displacement is an important index to reflect structural deformation.The national code specifies the limit value of the ratio of the maximum floor displacement to the height of the floor.However, for high-rise shear wall structures, according to the ratio of height to width, the deformation curve under horizontal load is of bending shear type or bending type, and the interstory displacement not only includes the displacement caused by the stress of the member.It also includes the displacement caused by the integral bending of the structure (harmless layer displacement), and with the increase of the floor, the ratio of the harmless layer displacement to the interstory displacement is increasing.In order to make the interstory displacement containing harmless interstory displacement meet the limit value of the national code, the structural designers have to increase the stiffness of the structure, and the direct result is that the seismic response of the structure is increased, which not only results in economic waste.Moreover, it is unfavorable to earthquake resistance of the structure.In this paper, the following contents are emphatically discussed: the composition of the structure floor displacement, the concept of the harmful layer displacement and the harmless layer displacement.And the calculation method of harmless interstory displacement. (2) from the actual engineering of all the high-rise structures designed and participated in the design over the past ten years, nine typical high-rise shear wall structures with a height of about 100 m and a aspect ratio of 3 ~ 8 are selected.By using the finite element analysis software ETABS 9.7.1, four tall shear wall structure models with different height and different aspect ratio are established to calculate the lateral displacement and interstory displacement of the structure under horizontal load.(4) to analyze the variation of harmless interstory displacement with the ratio of height and height to width of the structure, and the law of the growth rate of harmless interstory displacement along the floor.And the ratio of the harmless layer displacement to the floor displacement at the maximum floor displacement is calculated, and the floor range of the maximum harmful floor displacement is calculated. It is suggested that the harmful layer displacement of the structure be used as the index to control the lateral displacement stiffness.The acceleration of the structure vertex can be controlled in combination with the requirement of comfort.
【學位授予單位】:華僑大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TU973.16

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