超高巨柱—核心筒—伸臂結(jié)構(gòu)地震災(zāi)變及抗震性能研究
發(fā)布時間：2018-10-21 18:46
【摘要】：近年來，我國在地震區(qū)修建了大量超高層建筑，使得超高層建筑的抗震性能成為工程界和學術(shù)界共同關(guān)注的熱點。超高巨柱－核心筒－伸臂結(jié)構(gòu)是近年來在超高層建筑中應(yīng)用較多的一種結(jié)構(gòu)形式。本文以632m的上海中心大廈這一典型的超高巨柱－核心筒－伸臂結(jié)構(gòu)為基本研究對象，對其在特大地震下的動力災(zāi)變和抗震性能展開了系列研究，重點研究了其在特大地震下的動力災(zāi)變模擬、合理的地震動強度指標的選取、地震耗能分布規(guī)律以及最小地震剪力系數(shù)對超高巨柱－核心筒－伸臂結(jié)構(gòu)抗震性能的影響等關(guān)鍵問題，取得了如下的主要研究成果： （1）提出了超高巨柱－核心筒－伸臂結(jié)構(gòu)在特大地震下的倒塌災(zāi)變過程模擬方法。以上海中心大廈為基本研究對象，利用通用有限元程序MSC.Marc2007建立了合理的有限元模型；并利用基于材料本構(gòu)層次的生死單元子程序，成功實現(xiàn)了超高巨柱－核心筒－伸臂結(jié)構(gòu)在特大地震下倒塌災(zāi)變過程的模擬，為研究其在強震作用下的損傷演化規(guī)律和倒塌災(zāi)變機理提供了基礎(chǔ)。 （2）提出了適用于超高層建筑抗震分析用的地震動強度指標。通過對現(xiàn)階段常用地震動強度指標的分析，結(jié)合超高層建筑地震響應(yīng)中高階振型影響顯著的特點，提出了形式簡便的基于彈性反應(yīng)譜加速度幾何平均值的地震動強度指標，并通過大量算例的時程分析，回歸得到了指標中關(guān)鍵參數(shù)的合理取值，為減小超高層建筑地震響應(yīng)預(yù)測結(jié)果的離散性提供了參考。 （3）研究了超高巨柱－核心筒－伸臂結(jié)構(gòu)的地震耗能分布規(guī)律。通過對上海中心大廈在不同地震動強度下的時程分析，，統(tǒng)計得到了地震耗能分布規(guī)律。結(jié)果表明：上海中心大廈的地震輸入能量主要由結(jié)構(gòu)本身阻尼耗散，塑性滯回耗能則主要集中在結(jié)構(gòu)的上部4個節(jié)段，其中伸臂桁架是最主要也是最理想的塑性耗能構(gòu)件；通過在伸臂桁架上附加粘滯阻尼器，可減輕高階振型引起的上部節(jié)段的損傷程度，使結(jié)構(gòu)側(cè)向變形更加均勻，為超高層建筑的損傷控制提供參考。 （4）討論了最小地震剪力系數(shù)對超高巨柱－核心筒－伸臂結(jié)構(gòu)抗震性能的影響。以8度區(qū)的假想超高層建筑結(jié)構(gòu)為例，在設(shè)計條件完全相同的條件下，按照三種不同的最小地震剪力控制方案設(shè)計了三個相應(yīng)的超高層建筑模型，并基于彈塑性時程分析和倒塌分析，討論了最小地震剪力系數(shù)對超高巨柱－核心筒－伸臂結(jié)構(gòu)抗震性能的影響，為進一步完善超高層建筑設(shè)計方法提供了依據(jù)。
[Abstract]:In recent years, a large number of super-tall buildings have been built in the earthquake area in China, which makes the seismic performance of super-tall buildings become the focus of common concern in the engineering and academic circles. Super-high column-core tube-arm structure is a kind of structure which is widely used in super-tall buildings in recent years. In this paper, the 632 m Shanghai Central Mansion, a typical super-high column, core tube and cantilever structure, is taken as the basic research object, and its dynamic catastrophe and seismic performance under the earthquake are studied in a series. In this paper, the dynamic disaster simulation and the reasonable selection of earthquake intensity index are studied. The key problems such as the distribution of seismic energy dissipation and the influence of minimum seismic shear coefficient on the seismic behavior of ultra-high giant column-core tube-extension arm structures are discussed. The main research results are as follows: (1) A method for simulating the collapse and catastrophe process of ultra-high giant column-core tube-extended-arm structures under a large earthquake is proposed. Taking Shanghai Central Mansion as the basic research object, the reasonable finite element model is established by using the universal finite element program MSC.Marc2007, and the life and death element subprogram based on the material constitutive hierarchy is used. The collapse and catastrophe process of ultra-high giant column, core tube and extended arm structure under a large earthquake is successfully simulated. It provides a basis for studying the law of damage evolution and collapse mechanism under strong earthquake. (2) the index of ground motion intensity suitable for seismic analysis of super-tall buildings is put forward. Based on the analysis of the commonly used ground motion intensity indexes at present and the remarkable influence of high order modes on the seismic response of super tall buildings, a simple and convenient index of ground motion intensity based on the geometric average of the acceleration of elastic response spectrum is proposed. Through the time history analysis of a large number of examples, the reasonable value of the key parameters in the index is obtained by regression. This paper provides a reference for reducing the dispersion of earthquake response prediction results of super-tall buildings. (3) the distribution of seismic energy dissipation of super-tall column-core tube-arm structures is studied. Based on the time-history analysis of Shanghai Central Mansion under different ground motion intensity, the distribution of earthquake energy dissipation is obtained by statistics. The results show that the seismic input energy of Shanghai Central Mansion is mainly dissipated by the damping of the structure itself, and the plastic hysteretic energy dissipation is mainly concentrated in the upper four segments of the structure, in which the cantilever truss is the most important and ideal plastic energy dissipation member. By attaching viscous dampers to the cantilever truss, the damage degree of the upper segment caused by high-order modes can be reduced, and the lateral deformation of the structure can be more uniform. It provides a reference for damage control of super-tall buildings. (4) the influence of minimum seismic shear coefficient on seismic behavior of super-tall column-core tube-arm structures is discussed. Taking the hypothetical super-tall building structure in the 8 degree region as an example, under the same design conditions, three corresponding super-tall building models are designed according to three different minimum seismic shear control schemes. Based on the elastic-plastic time-history analysis and collapse analysis, the influence of the minimum seismic shear coefficient on the seismic behavior of super-tall column-core tube-arm structures is discussed, which provides a basis for further improving the design method of super-tall buildings.
【學位授予單位】：清華大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU973.31
本文編號：2286020
[Abstract]:In recent years, a large number of super-tall buildings have been built in the earthquake area in China, which makes the seismic performance of super-tall buildings become the focus of common concern in the engineering and academic circles. Super-high column-core tube-arm structure is a kind of structure which is widely used in super-tall buildings in recent years. In this paper, the 632 m Shanghai Central Mansion, a typical super-high column, core tube and cantilever structure, is taken as the basic research object, and its dynamic catastrophe and seismic performance under the earthquake are studied in a series. In this paper, the dynamic disaster simulation and the reasonable selection of earthquake intensity index are studied. The key problems such as the distribution of seismic energy dissipation and the influence of minimum seismic shear coefficient on the seismic behavior of ultra-high giant column-core tube-extension arm structures are discussed. The main research results are as follows: (1) A method for simulating the collapse and catastrophe process of ultra-high giant column-core tube-extended-arm structures under a large earthquake is proposed. Taking Shanghai Central Mansion as the basic research object, the reasonable finite element model is established by using the universal finite element program MSC.Marc2007, and the life and death element subprogram based on the material constitutive hierarchy is used. The collapse and catastrophe process of ultra-high giant column, core tube and extended arm structure under a large earthquake is successfully simulated. It provides a basis for studying the law of damage evolution and collapse mechanism under strong earthquake. (2) the index of ground motion intensity suitable for seismic analysis of super-tall buildings is put forward. Based on the analysis of the commonly used ground motion intensity indexes at present and the remarkable influence of high order modes on the seismic response of super tall buildings, a simple and convenient index of ground motion intensity based on the geometric average of the acceleration of elastic response spectrum is proposed. Through the time history analysis of a large number of examples, the reasonable value of the key parameters in the index is obtained by regression. This paper provides a reference for reducing the dispersion of earthquake response prediction results of super-tall buildings. (3) the distribution of seismic energy dissipation of super-tall column-core tube-arm structures is studied. Based on the time-history analysis of Shanghai Central Mansion under different ground motion intensity, the distribution of earthquake energy dissipation is obtained by statistics. The results show that the seismic input energy of Shanghai Central Mansion is mainly dissipated by the damping of the structure itself, and the plastic hysteretic energy dissipation is mainly concentrated in the upper four segments of the structure, in which the cantilever truss is the most important and ideal plastic energy dissipation member. By attaching viscous dampers to the cantilever truss, the damage degree of the upper segment caused by high-order modes can be reduced, and the lateral deformation of the structure can be more uniform. It provides a reference for damage control of super-tall buildings. (4) the influence of minimum seismic shear coefficient on seismic behavior of super-tall column-core tube-arm structures is discussed. Taking the hypothetical super-tall building structure in the 8 degree region as an example, under the same design conditions, three corresponding super-tall building models are designed according to three different minimum seismic shear control schemes. Based on the elastic-plastic time-history analysis and collapse analysis, the influence of the minimum seismic shear coefficient on the seismic behavior of super-tall column-core tube-arm structures is discussed, which provides a basis for further improving the design method of super-tall buildings.
【學位授予單位】：清華大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU973.31
【參考文獻】
相關(guān)期刊論文 前10條
1 繆志偉;陸新征;王載;黃盛楠;葉列平;;某鋼框架偏心核心筒彈塑性分析[J];四川建筑科學研究;2008年03期
2 賈鵬;杜修力;趙均;;不同軸壓比鋼筋混凝土核心筒抗震性能[J];北京工業(yè)大學學報;2009年01期
3 陳小剛;牟在根;張舉兵;王翠坤;陳才華;孫慧中;;型鋼混凝土柱抗震性能實驗研究[J];北京科技大學學報;2009年12期
4 呂大剛;李曉鵬;胡曉琦;王光遠;;鋼框架結(jié)構(gòu)的非線性靜力抗震可靠性分析 II:可靠度指標及其靈敏度[J];地震工程與工程振動;2008年01期
5 董雪;李忠獻;;鋼筋混凝土大底盤雙塔樓超高層建筑結(jié)構(gòu)抗震設(shè)計與分析[J];福州大學學報(自然科學版);2005年S1期
6 程光煜;葉列平;;彈塑性SDOF系統(tǒng)累積滯回耗能譜[J];工程抗震與加固改造;2007年02期
7 程光煜;葉列平;;彈塑性MDOF系統(tǒng)地震輸入能量研究[J];工程抗震與加固改造;2007年06期
8 尤麗娟;陳忠范;;加強層對超高層結(jié)構(gòu)抗震性能的影響[J];工程抗震與加固改造;2010年02期
9 汪訓流;陸新征;葉列平;;往復荷載下鋼筋混凝土柱受力性能的數(shù)值模擬[J];工程力學;2007年12期
10 程光煜;葉列平;;彈塑性SDOF系統(tǒng)的地震輸入能量譜[J];工程力學;2008年02期
相關(guān)博士學位論文 前1條
1 黃思凝;外廊式RC框架地震破壞及倒塌機理研究[D];中國地震局工程力學研究所;2012年
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