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  本文選題：中空夾層鋼管混凝土　切入點：組合K形節(jié)點　出處：《清華大學》2014年博士論文　論文類型：學位論文

【摘要】：中空夾層鋼管混凝土是一種新型組合構件，已在電力桿塔等工程結構中得到應用。當其充當桁架或塔架結構中的弦桿時，常與空鋼管腹桿組成K形節(jié)點，而以往對該類組合節(jié)點設計原理的研究尚少見報道。本文研究圓截面中空夾層鋼管混凝土-鋼管K形連接節(jié)點（以下簡稱為“中空夾層鋼管混凝土K形節(jié)點”）的工作機理和設計方法，主要研究工作和研究結果如下： 1.研究了中空夾層鋼管混凝土構件在側向荷載作用下的力學性能。以桿件空心率、徑厚比、管徑比和側向荷載角度為參數，開展了系列試驗。研究結果表明，側向荷載作用下的中空夾層鋼管混凝土試件表現出良好的延性性能，其承載能力和變形能力明顯優(yōu)于相應的空鋼管構件。建立了有限元分析模型，研究了構件的受力全過程和典型破壞模態(tài)，深入認識了側向荷載作用下鋼管與混凝土間的傳力機制。 2.進行了中空夾層鋼管混凝土K形節(jié)點在軸向荷載作用下的系列試驗研究。實現了兩種典型邊界的加載，研究了中空夾層鋼管混凝土弦桿空心率、腹弦桿管徑比、弦桿軸力水平等參數下節(jié)點的力學性能變化規(guī)律。結果表明，組合節(jié)點承載能力強，在弦桿空心率為0~0.6、腹弦桿管徑比為0.4~0.6時，發(fā)生弦桿進入塑性、受壓腹桿屈曲的破壞形態(tài)。 3.建立了中空夾層鋼管混凝土K形節(jié)點受力全過程分析的有限元模型。模型中考慮了材料與幾何非線性、鋼管和混凝土間的相互作用，計算結果得到試驗結果的驗證。利用有限元模型，，研究了組合節(jié)點的典型破壞形態(tài)和全過程荷載-變形關系，實現了對特征點處弦桿、腹桿材料應力發(fā)展的細致分析，深入認識了節(jié)點的受力全過程工作機理。 4.研究了中空夾層鋼管混凝土K形節(jié)點承載力實用計算方法。對影響組合節(jié)點性能的參數，如中空夾層鋼管混凝土弦桿空心率、腹弦桿管徑比、弦桿徑厚比、弦桿軸力水平等進行了細致的計算分析，在此基礎上針對夾層混凝土的局部承壓破壞、弦桿表面塑性失效等典型破壞形態(tài)，提出了相應的承載力實用計算方法，計算結果與試驗結果及有限元分析結果均吻合良好。
[Abstract]:Concrete filled hollow sandwich steel tube (CFST) is a new type of composite member, which has been used in engineering structures such as power towers. When it acts as a chord in truss or tower structure, it often forms K-shaped joints with hollow steel tube webs. However, previous studies on the design principle of this kind of composite joints are rarely reported. In this paper, the circular section hollow sandwich steel tube concrete-filled steel tube K-shaped connections (hereinafter referred to as "hollow sandwich concrete filled steel tube K-joints") are studied in this paper. Working mechanism and design method, The main research work and findings are as follows:. 1. The mechanical properties of hollow sandwich concrete-filled steel tube members under lateral load are studied. Taking the hollow ratio, diameter to thickness ratio, pipe diameter ratio and lateral load angle as parameters, a series of tests are carried out. The concrete filled hollow sandwich steel tube specimens under lateral load show good ductility, their bearing capacity and deformation capacity are obviously superior to those of the corresponding hollow steel tube members. The finite element analysis model is established. The whole process and typical failure modes of members are studied, and the mechanism of force transfer between steel tube and concrete under lateral load is deeply understood. 2. A series of tests of hollow sandwich concrete-filled steel tube (CFST) K joints under axial load are carried out. The loading of two typical boundaries is realized, and the hollow ratio of hollow sandwich concrete filled steel tube chords and the diameter ratio of web chords are studied. The results show that the combined joint has a strong bearing capacity. When the chord hollow ratio is 0 ~ 0.6 and the diameter ratio of a web chord is 0.4 ~ 0.6, the chord enters into plasticity and the buckling of the web member under compression occurs. 3. A finite element model for the analysis of the whole process of stress of hollow sandwich steel tube concrete filled steel tubular joints is established. The material and geometric nonlinearity and the interaction between steel tube and concrete are taken into account in the model. The finite element model is used to study the typical failure form and load-deformation relationship of the composite joints, and the stress development of chords and webs at characteristic points is analyzed in detail. The working mechanism of the whole process of the joint force is deeply understood. 4. The practical calculation method of bearing capacity of hollow sandwich concrete-filled steel tube K joints is studied. The parameters affecting the performance of composite joints, such as hollow ratio of hollow sandwich concrete filled steel tube chords, diameter ratio of web chords, ratio of diameter to thickness of strings, are studied. Based on the detailed calculation and analysis of the axial force level of the chord, a practical calculation method for the bearing capacity of sandwich concrete is put forward in view of the typical failure modes such as local bearing failure and plastic failure of the chord surface. The calculated results are in good agreement with the experimental results and the finite element analysis results.
【學位授予單位】：清華大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU398.9

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