【摘要】：近年來,超高層鋼框架-混凝土核心筒混合結(jié)構(gòu)作為一種新型結(jié)構(gòu)體系在我國得到迅速發(fā)展。對(duì)于高層混合結(jié)構(gòu)的豎向變形分析和塔吊附著節(jié)點(diǎn)的研究,是一項(xiàng)很重要的內(nèi)容。本文以某寫字樓為工程背景,對(duì)超高層混合結(jié)構(gòu)的豎向變形分析以及外爬式塔吊支撐架對(duì)核心筒的影響進(jìn)行研究,主要研究內(nèi)容及結(jié)論如下： (1)以高度為300m的某寫字樓為例,利用MIDAS/Gen有限元分析軟件,在不考慮基礎(chǔ)沉降變形的前提下,采用歐洲混凝土結(jié)構(gòu)模式規(guī)范CEB-FIP (MC90)描述混凝土的收縮徐變,研究了混凝土收縮徐變、施工速率、施工找平和核心筒領(lǐng)先施工層數(shù)等時(shí)變因素和工程措施對(duì)豎向變形的影響,得到如下結(jié)論：整體結(jié)構(gòu)模型與施工階段模型的分析結(jié)果存在著較大的差異,應(yīng)采用考慮混凝土收縮徐變的施工階段模型；施工速率對(duì)結(jié)構(gòu)豎向變形的影響較�。缓诵耐蚕刃惺┕訑�(shù)越多,越利于減小鋼框架柱與核心筒豎向變形差；收縮徐變?cè)龃笾沧冃尾?由于收縮徐變作用,隨著結(jié)構(gòu)完成后時(shí)間推移,結(jié)構(gòu)的內(nèi)外變形差會(huì)不斷增大；混凝土的收縮徐變?cè)斐闪诉B接核心筒與外框架的梁支座端部剪力及負(fù)彎矩變化,連接外鋼框架柱一端梁支座端部剪力及負(fù)彎矩增加,而連接核心筒一端則減小。 (2)結(jié)合工程實(shí)例,建立外爬式塔吊支撐架模型,分析了外爬式塔吊附著節(jié)點(diǎn)預(yù)埋件的受力性能及其對(duì)附著墻體抗沖切性能的影響,并提出了爬塔支撐架預(yù)應(yīng)力拉索加固方案。加固后的支撐架改變了節(jié)點(diǎn)的受力情況,可避免附著混凝土墻體的開裂,從而保證了節(jié)點(diǎn)安全。
[Abstract]:In recent years, as a new type of structural system, super-tall steel frame-concrete core-tube hybrid structure has been developed rapidly in China. It is very important to analyze the vertical deformation of high-rise hybrid structures and to study the attached joints of tower cranes. Based on the engineering background of an office building, this paper studies the vertical deformation analysis of super high-rise hybrid structure and the influence of the external climbing tower crane on the core tube. The main research contents and conclusions are as follows: (1) taking an office building with a height of 300m as an example, using MIDAS/Gen finite element analysis software, without considering the settlement deformation of foundation, CEB-FIP (MC90) is used to describe the shrinkage and creep of concrete. The shrinkage and creep of concrete and the construction rate are studied. The influence of time varying factors and engineering measures on vertical deformation of construction leveling and core tube leading construction is obtained as follows: there are great differences between the analysis results of the integral structure model and the construction stage model. The construction stage model considering concrete shrinkage and creep should be adopted. The construction rate has little effect on the vertical deformation of the structure, and the more the number of the core tube is, the more the vertical deformation difference between the steel frame column and the core tube is reduced. Shrinkage and creep increase the difference of cylinder deformation. Due to the effect of shrinkage and creep, the difference between internal and external deformation of the structure will increase with time after the completion of the structure. The shrinkage and creep of concrete cause the change of shear force and negative bending moment at the end of the beam support connecting the core tube and the outer frame. The shear force and negative bending moment of the end of the beam support at the end of the connecting steel frame column increase, but the end of the connection core tube decreases. (2) combined with the engineering example, the model of the external climbing tower crane support frame is established, and the mechanical behavior of the embedded part of the attachment joint of the outer climbing tower crane and its influence on the impact and shear behavior of the attachment wall are analyzed. The scheme of prestressed cable reinforcement of climbing tower support frame is put forward. The strengthened bracing can change the stress of the joint, avoid the crack of the attached concrete wall, and ensure the safety of the joint.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU974

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