【摘要】：斜柱轉(zhuǎn)換結(jié)構(gòu)是近年較新出現(xiàn)的一種轉(zhuǎn)換結(jié)構(gòu)形式，斜柱轉(zhuǎn)換傳力簡單直接，能更加有效地利用建筑空間，增強(qiáng)結(jié)構(gòu)的受力性能，控制工程成本，有廣泛的應(yīng)用前景。但目前尚未見到關(guān)于帶斜柱轉(zhuǎn)換結(jié)構(gòu)彈塑性地震反應(yīng)分析的相關(guān)成果。 鋼筋混凝土結(jié)構(gòu)的彈塑性性能一直是結(jié)構(gòu)研究中最重要的課題之一，纖維單元模型是目前鋼筋混凝土框架結(jié)構(gòu)彈塑性分析中最為細(xì)化并接近實(shí)際結(jié)構(gòu)受力性能的數(shù)值分析模型，應(yīng)用范圍較廣。纖維單元模型的理論與材料的本構(gòu)關(guān)系密切，計(jì)算模擬分析的準(zhǔn)確性很大程度上取決于材料模型的合理性。考慮橫向鋼筋與縱筋對(duì)核心混凝土共同約束作用，，Mander約束混凝土本構(gòu)模型在工程實(shí)踐中得到很好的應(yīng)用。但Mander模型的約束混凝土抗壓強(qiáng)度計(jì)算較為繁瑣，在實(shí)際應(yīng)用中往往未能完全顯示出其對(duì)約束混凝土性能提高的意義。 本研究的主要?jiǎng)?chuàng)新性工作包括以下三部分內(nèi)容： （1）對(duì)帶斜柱轉(zhuǎn)換的江門某酒店建筑結(jié)構(gòu)的1:35縮尺模型進(jìn)行地震模擬振動(dòng)臺(tái)試驗(yàn)，并對(duì)試驗(yàn)結(jié)果進(jìn)行系統(tǒng)的分析和研究，了解該結(jié)構(gòu)在地震作用下的基本性能。試驗(yàn)結(jié)果揭示出結(jié)構(gòu)設(shè)計(jì)中存在的不足。 （2）在對(duì)鋼筋混凝土約束本構(gòu)模型重新梳理的基礎(chǔ)上，提出一種考慮非對(duì)稱箍筋約束矩形混凝土構(gòu)件的Mander本構(gòu)模型的計(jì)算方法：分別計(jì)算兩向等效等軸圍壓，通過求冪平均值等方法考慮兩向圍壓不同的情況。將此方法運(yùn)用于Mander約束混凝土本構(gòu)計(jì)算中，省去了繁瑣的查表步驟，并可得到較為準(zhǔn)確可靠的約束混凝土抗壓強(qiáng)度。本研究還將此方法運(yùn)用于實(shí)際工程，對(duì)帶斜柱轉(zhuǎn)換的高層建筑結(jié)構(gòu)彈塑性地震反應(yīng)分析，分析結(jié)果基本與地震模擬振動(dòng)臺(tái)試驗(yàn)結(jié)果相符。 （3）基于地震模擬振動(dòng)臺(tái)試驗(yàn)結(jié)果及數(shù)值模擬結(jié)果的對(duì)比和分析，對(duì)研究對(duì)象原結(jié)構(gòu)的塔樓和斜柱轉(zhuǎn)換結(jié)構(gòu)部分分別進(jìn)行優(yōu)化。針對(duì)塔樓部分在水平地震作用下扭轉(zhuǎn)效應(yīng)較大的問題通過增加防屈曲約束支撐對(duì)其進(jìn)行優(yōu)化；針對(duì)斜柱轉(zhuǎn)換結(jié)構(gòu)中斜柱傾角較小、長度較長、截面較大、設(shè)計(jì)偏于保守的問題提出一種適用于該類型斜柱轉(zhuǎn)換結(jié)構(gòu)的斜柱傾斜角和鋼管混凝土截面優(yōu)化的計(jì)算方法。并對(duì)優(yōu)化后的結(jié)構(gòu)模型進(jìn)行彈塑性地震反應(yīng)分析，驗(yàn)證了優(yōu)化設(shè)計(jì)的可行性和有效性。
[Abstract]:Oblique column transfer structure is a new type of conversion structure in recent years. The transfer force of inclined column is simple and direct, which can make more effective use of building space, enhance the mechanical performance of the structure, control the engineering cost, and have a wide application prospect. However, there is no relevant result of elastic-plastic seismic response analysis of inclined column transfer structure. The elastoplastic behavior of reinforced concrete structures has been one of the most important topics in the structural research. Fiber element model is the most detailed numerical analysis model in the elastoplastic analysis of reinforced concrete frame structures, which is close to the actual structural mechanical properties. It has a wide range of applications. The theory of fiber unit model is closely related to the constitutive relation of material, and the accuracy of calculation and simulation depends on the rationality of material model to a great extent. The Mander confined concrete constitutive model is well applied in engineering practice considering the joint restraint of transverse and longitudinal bars on core concrete. However, the calculation of compressive strength of confined concrete based on Mander model is rather complicated, and its significance to the improvement of confined concrete performance is often not fully demonstrated in practical application. The main innovative work of this study includes the following three parts: (1) the seismic simulation shaking table test is carried out on the 1:35 scale model of a hotel building structure in Jiangmen with inclined column conversion. The experimental results are systematically analyzed and studied to understand the basic performance of the structure under seismic action. The experimental results reveal the shortcomings in structural design. (2) on the basis of recombing the reinforced concrete restrained constitutive model, A calculation method of Mander constitutive model for rectangular concrete members with asymmetric stirrups is presented. The method is applied to the constitutive calculation of Mander confined concrete, and the complicated table checking step is eliminated, and the compressive strength of confined concrete can be obtained more accurately and reliably. This method is also applied to practical engineering to analyze the elastoplastic seismic response of tall building structures with inclined column conversion. The results are basically consistent with the results of shaking table test. (3) based on the comparison and analysis of the results of shaking table test and numerical simulation, The original tower and oblique column transfer structure were optimized respectively. In order to solve the problem that the torsional effect of tower is larger under horizontal earthquake, the inclined angle of inclined column is smaller, the length of inclined column is longer and the section is larger, which is optimized by adding buckling restrained bracing, and the inclined angle of inclined column is smaller, the length of inclined column is longer, and the section is larger. This paper presents a method for calculating the slope angle of inclined column and section optimization of concrete filled steel tube (CFST), which is suitable for this type of inclined column transfer structure. The elastoplastic seismic response analysis of the optimized structural model verifies the feasibility and effectiveness of the optimized design.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU973.212

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