本文選題：超高層結(jié)構(gòu)　切入點：巨型構(gòu)件　出處：《清華大學(xué)》2013年碩士論文

【摘要】：隨著超高層建筑的迅猛發(fā)展，超高層結(jié)構(gòu)已成為土木工程領(lǐng)域的研究熱點。由于超高層結(jié)構(gòu)體系復(fù)雜，體量龐大，與傳統(tǒng)高層結(jié)構(gòu)有較大不同，目前相應(yīng)的設(shè)計方法和計算模型的研究都較為有限，尚不能適應(yīng)工程應(yīng)用的發(fā)展。本文以實際工程項目為背景，，對某超高層巨型支撐框架-核心筒結(jié)構(gòu)（結(jié)構(gòu)高度約550m）的兩個主要初步設(shè)計方案--全支撐方案和半支撐方案開展了研究，主要內(nèi)容包括： （1）對超高層結(jié)構(gòu)中巨型構(gòu)件的數(shù)值計算模型進行了文獻調(diào)研和初步研究。建議對該超高層結(jié)構(gòu)，采用分層殼模型模擬組合剪力墻，纖維模型模擬巨型支撐，基于有限元軟件二次開發(fā)子程序的纖維模型模擬巨型柱。并對方鋼管混凝土柱軸壓承載能力的尺寸效應(yīng)開展了研究，通過試驗數(shù)據(jù)與計算結(jié)果的比較，發(fā)現(xiàn)現(xiàn)有的設(shè)計計算公式存在著不同程度的隨著構(gòu)件尺寸增大而計算值偏大的趨勢，提出了考慮尺寸效應(yīng)的承載力修正建議。 （2）對該超高層巨型結(jié)構(gòu)開展了抗震彈塑性分析、地震倒塌模擬和地震倒塌易損性分析�？拐饛椝苄苑治鼋Y(jié)果表明該超高層巨型結(jié)構(gòu)設(shè)計較強，具有較高的抗震能力，在8度設(shè)計大震下仍基本保持彈性；地震倒塌易損性分析結(jié)果表明該超高層巨型結(jié)構(gòu)具有較高的抗地震倒塌安全儲備；而地震倒塌模擬的結(jié)果表明，在極端罕遇地震下，該超高層巨型結(jié)構(gòu)的倒塌模式為豎向倒塌，而不是水平傾覆倒塌。全支撐結(jié)構(gòu)模型的抗震能力與半支撐結(jié)構(gòu)模型相當，而混凝土用量有明顯降低。 （3）建立了該超高層巨型結(jié)構(gòu)的彎曲-剪切模型和桿系簡化模型。彎曲-剪切模型由彎曲梁和剪切梁組成，可以考慮結(jié)構(gòu)彎曲變形和剪切變形的組合。通過合適的參數(shù)取值，彎曲-剪切模型可以準確把握結(jié)構(gòu)的基本動力特性并極大節(jié)省計算工作量。桿系簡化模型將三維模型簡化為二維模型，可以準確計算結(jié)構(gòu)的基本動力特性并預(yù)測結(jié)構(gòu)的非線性地震響應(yīng)。簡化模型可為結(jié)構(gòu)方案初步設(shè)計和方案比選提供參考。 （4）采用該超高層巨型結(jié)構(gòu)的桿系簡化模型進行了結(jié)構(gòu)耗能計算。通過計算結(jié)構(gòu)在不同地震動強度下的耗能，可以定量評價結(jié)構(gòu)各類構(gòu)件的耗能貢獻，明確各類構(gòu)件的耗能主次關(guān)系，同時可以明確結(jié)構(gòu)的區(qū)域耗能分布情況，從而為結(jié)構(gòu)的性能化設(shè)計提供參考和依據(jù)。
[Abstract]:With the rapid development of super-tall buildings, super-high-rise structures have become a research hotspot in the field of civil engineering. At present, the research of the corresponding design method and calculation model is very limited, so it can not adapt to the development of engineering application. This paper takes the actual engineering project as the background. In this paper, two primary design schemes of a super-tall mega braced frame-core tube structure (the height of structure is about 550 m)-full bracing scheme and half bracing scheme are studied. The main contents are as follows:. In this paper, the numerical calculation model of mega-members in super-tall structures is investigated and preliminarily studied. It is suggested that laminated shell model be used to simulate composite shear wall and fiber model be used to simulate giant braces. Based on the secondary development of the finite element software subroutine fiber model is developed to simulate giant columns. The size effect of axial compression capacity of concrete filled steel tubular columns (CFST) is studied. The experimental data are compared with the calculated results. It is found that the existing design calculation formulas tend to be larger with the increase of the member size to varying degrees, and some suggestions are put forward to amend the bearing capacity taking into account the size effect. The aseismic elastic-plastic analysis, earthquake collapse simulation and seismic collapse vulnerability analysis of the super-tall mega structure are carried out. The results of seismic elastic-plastic analysis show that the super-tall mega structure is of strong design and high seismic resistance. The results of seismic collapse vulnerability analysis show that the super-tall mega structure has a high safety reserve against earthquake collapse, and the results of earthquake collapse simulation show that under extremely rare earthquakes, the earthquake collapse simulation results show that, The collapse mode of the super-tall mega structure is vertical collapse rather than horizontal overturning collapse. The seismic capacity of the full-braced structure model is similar to that of the semi-braced structure model, but the concrete content is obviously reduced. The bending shear model and the simplified bar system model of the super tall mega structure are established. The bending shear model consists of a bending beam and a shear beam. The combination of bending and shear deformation of the structure can be considered. The bending shear model can accurately grasp the basic dynamic characteristics of the structure and greatly reduce the computational workload. It can accurately calculate the basic dynamic characteristics of the structure and predict the nonlinear seismic response of the structure, and the simplified model can provide a reference for the preliminary design of the structural scheme and the selection of the scheme. The energy dissipation of the structure is calculated by using the simplified model of the super tall mega structure. By calculating the energy dissipation of the structure under different ground motion intensity, the energy consumption contribution of various structural members can be quantitatively evaluated. The main and secondary relationships of energy consumption of various kinds of components can be defined, and the distribution of energy consumption in the region of structures can be determined, thus providing a reference and basis for the performance-based design of structures.
【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】：2013
【分類號】：TU973.17;TU973.31

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