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

【摘要】：中空夾層鋼管混凝土是一種新型組合構(gòu)件，已在電力桿塔等工程結(jié)構(gòu)中得到應(yīng)用。當(dāng)其充當(dāng)桁架或塔架結(jié)構(gòu)中的弦桿時(shí)，常與空鋼管腹桿組成K形節(jié)點(diǎn)，而以往對(duì)該類組合節(jié)點(diǎn)設(shè)計(jì)原理的研究尚少見(jiàn)報(bào)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(diǎn)（以下簡(jiǎn)稱為“中空夾層鋼管混凝土K形節(jié)點(diǎn)”）的工作機(jī)理和設(shè)計(jì)方法，主要研究工作和研究結(jié)果如下： 1.研究了中空夾層鋼管混凝土構(gòu)件在側(cè)向荷載作用下的力學(xué)性能。以桿件空心率、徑厚比、管徑比和側(cè)向荷載角度為參數(shù)，開(kāi)展了系列試驗(yàn)。研究結(jié)果表明，側(cè)向荷載作用下的中空夾層鋼管混凝土試件表現(xiàn)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(yīng)的空鋼管構(gòu)件。建立了有限元分析模型，研究了構(gòu)件的受力全過(guò)程和典型破壞模態(tài)，深入認(rèn)識(shí)了側(cè)向荷載作用下鋼管與混凝土間的傳力機(jī)制。 2.進(jìn)行了中空夾層鋼管混凝土K形節(jié)點(diǎn)在軸向荷載作用下的系列試驗(yàn)研究。實(shí)現(xiàn)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(shù)下節(jié)點(diǎn)的力學(xué)性能變化規(guī)律。結(jié)果表明，組合節(jié)點(diǎn)承載能力強(qiáng)，在弦桿空心率為0~0.6、腹弦桿管徑比為0.4~0.6時(shí)，發(fā)生弦桿進(jìn)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(diǎn)受力全過(guò)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(jì)算結(jié)果得到試驗(yàn)結(jié)果的驗(yàn)證。利用有限元模型，，研究了組合節(jié)點(diǎn)的典型破壞形態(tài)和全過(guò)程荷載-變形關(guān)系，實(shí)現(xiàn)了對(duì)特征點(diǎn)處弦桿、腹桿材料應(yīng)力發(fā)展的細(xì)致分析，深入認(rèn)識(shí)了節(jié)點(diǎn)的受力全過(guò)程工作機(jī)理。 4.研究了中空夾層鋼管混凝土K形節(jié)點(diǎn)承載力實(shí)用計(jì)算方法。對(duì)影響組合節(jié)點(diǎn)性能的參數(shù)，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(jìn)行了細(xì)致的計(jì)算分析，在此基礎(chǔ)上針對(duì)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(yīng)的承載力實(shí)用計(jì)算方法，計(jì)算結(jié)果與試驗(yàn)結(jié)果及有限元分析結(jié)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(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU398.9

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