本文選題：超高層結(jié)構(gòu)　切入點(diǎn)：框架-核心筒　出處：《清華大學(xué)》2015年碩士論文

【摘要】：超高層建筑不但可以更好地解決大城市人口數(shù)量不斷增長所導(dǎo)致的用地緊張問題,還是一個國家經(jīng)濟(jì)發(fā)展水平與工程技術(shù)水平的綜合體現(xiàn)。隨著中國經(jīng)濟(jì)飛速發(fā)展,大型城市中超高層建筑也日益增多。由于中國是一個地震頻發(fā)的國家,許多大型城市位于8度設(shè)防區(qū),隨著建筑高度的增加,水平荷載在結(jié)構(gòu)設(shè)計過程中逐漸成為了關(guān)鍵因素。如何在結(jié)構(gòu)設(shè)計中尋求最佳方案,以控制結(jié)構(gòu)在地震作用下的側(cè)向變形,保證結(jié)構(gòu)安全,已成為了亟需解決的重要課題之一。而項目初步設(shè)計階段的結(jié)構(gòu)選型以及布置優(yōu)化直接影響結(jié)構(gòu)整體性能以及經(jīng)濟(jì)性,具有極其重要的地位。本文以350m高的西安利科國際金融中心超高層項目為工程實(shí)例,首先建立了8個模型,分別比較了結(jié)構(gòu)體系,框架柱間距,核心筒尺寸以及外框梁截面對于結(jié)構(gòu)抗震性能以及經(jīng)濟(jì)性的影響。根據(jù)計算結(jié)果得出了以下結(jié)論:1、選用框架-核心筒結(jié)構(gòu)體系在材料用量上會略多于采用巨型結(jié)構(gòu)體系;2、框架-核心筒結(jié)構(gòu)外框柱距越大,為了滿足抗側(cè)剛度的要求,外框架所需要的材料越多;3、增大結(jié)構(gòu)核心筒尺寸有利于整體抗側(cè)性能。根據(jù)初步設(shè)計選型結(jié)果,本項目最終主體結(jié)構(gòu)型式為核心筒尺寸30mX30m,外柱距6m的框架-核心筒結(jié)構(gòu)。隨后在不改變核心筒及外框架構(gòu)件尺寸的情況下,通過改變加強(qiáng)層的布置方案,建立了5個模型進(jìn)行對比分析。研究表明在第二、第四避難層設(shè)置加強(qiáng)層,并且在第五避難層設(shè)置環(huán)向桁架能夠有效控制結(jié)構(gòu)側(cè)向位移,為工程設(shè)計提供了一定參考依據(jù)。本文基于最終結(jié)構(gòu)方案模型,使用PKPM結(jié)構(gòu)設(shè)計軟件按照規(guī)范要求進(jìn)行了結(jié)構(gòu)彈性分析,證明經(jīng)過合理優(yōu)化設(shè)計的結(jié)構(gòu)方案各指標(biāo)均滿足規(guī)范限值,構(gòu)件承載力滿足設(shè)計要求。針對結(jié)構(gòu)超限情況,本文通過彈塑性時程分析驗證了結(jié)構(gòu)在罕遇地震作用下的安全性,證明結(jié)構(gòu)滿足“小震不壞,中震可修,大震不倒”的抗震設(shè)計原則。針對結(jié)構(gòu)關(guān)鍵節(jié)點(diǎn)以及薄弱部分,本文使用abaqus有限元軟件進(jìn)行建模分析,獲得了節(jié)點(diǎn)在罕遇地震作用下的內(nèi)力分布,對部分薄弱位置給出了設(shè)計建議。本文著重強(qiáng)調(diào)了前期結(jié)構(gòu)選型優(yōu)化的重要性,并對項目初步設(shè)計優(yōu)化過程進(jìn)行了的總結(jié)提煉,希望能為類似的超高層結(jié)構(gòu)方案設(shè)計提供一定的參考,簡化結(jié)構(gòu)設(shè)計人員工作內(nèi)容。
[Abstract]:Super high-rise buildings can not only better solve the problem of land shortage caused by the increasing population in large cities, but also reflect the level of economic development and engineering technology of a country. With the rapid development of China's economy, The number of super-tall buildings in large cities is also increasing. As China is a earthquake-prone country, many large cities are located in 8-degree fortified areas, and as the building height increases, The horizontal load has gradually become a key factor in the structural design. How to find the best scheme in the structural design to control the lateral deformation of the structure under earthquake to ensure the safety of the structure. It has become one of the important problems that need to be solved, and the structure selection and layout optimization in the initial design stage of the project directly affect the overall performance and economy of the structure. In this paper, taking the 350m tall project of Xi'an Lico International Financial Center as an example, eight models are established, and the structure system, frame and column spacing are compared respectively. The effects of the size of core tube and the section of external frame beam on the seismic performance and economy of the structure are discussed. According to the calculation results, the following conclusion is drawn: 1: 1, the material consumption of the frame-core tube structure system is slightly larger than that of the giant junction system. The larger the distance between the outer frame and the column of the frame-core tube structure is, In order to meet the requirements of lateral stiffness, the more materials are needed for the outer frame, the larger the size of the core tube is in favor of the overall anti-lateral performance. The final main structure of the project is a frame-core tube structure with a core cylinder size of 30mX 30m and a outer column spacing of 6m. Then, without changing the size of the core tube and the outer frame members, the arrangement of the strengthened layer is changed. Five models are established for comparative analysis. The results show that the reinforcement layer is set up in the second and fourth sheltered layer, and the annular truss in the fifth refuge layer can effectively control the lateral displacement of the structure. In this paper, based on the final structural scheme model, PKPM structural design software is used to analyze the structural elasticity according to the specifications. It is proved that every index of the structural scheme after reasonable optimization design meets the specified limit value and the bearing capacity of the member meets the design requirements. In view of the structure exceeding the limit, this paper verifies the safety of the structure under the action of rare earthquake by elastic-plastic time-history analysis. It is proved that the structure meets the aseismic design principle of "small earthquake is not bad, medium earthquake is repairable, large earthquake is not collapsed". For the key nodes and weak parts of the structure, the abaqus finite element software is used to model and analyze the structure. The internal force distribution of the joints under the action of rare earthquakes is obtained, and the design suggestions for some weak positions are given. This paper emphasizes the importance of the pre-stage structural selection and optimization, and summarizes and refines the optimization process of the preliminary design of the project. It is hoped that this paper can provide some reference for the design of similar super-high-rise structures and simplify the work of structural designers.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU973.17

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