【摘要】：鋼管混凝土是鋼管套箍混凝土的簡稱。它是將混凝土填入薄壁鋼管內(nèi)而形成的組合結(jié)構(gòu)材料,是約束混凝土的一種特殊形式。鋼管混凝土結(jié)構(gòu)具有較高的承載力和抗震性能、施工快速簡便、占用空間少、結(jié)構(gòu)自重小和經(jīng)濟(jì)效果好等優(yōu)勢,具有良好的工程應(yīng)用前景。鋼管輕骨料混凝土是在鋼管中填充高強(qiáng)度的輕骨料混凝土而形成的一種新型組合結(jié)構(gòu),具有強(qiáng)度高、延性好和自重輕等優(yōu)點(diǎn),將其推廣應(yīng)用到橋梁房屋工程具有顯著的經(jīng)濟(jì)和社會應(yīng)用效益。鋼管輕骨料混凝土柱的力學(xué)性能相關(guān)的研究工作,需要對鋼管輕骨料混凝土柱的粘結(jié)滑移整體分析與粘結(jié)強(qiáng)度等相關(guān)數(shù)據(jù)進(jìn)行深入分析研究,相關(guān)研究工作對于鋼管輕骨料混凝土柱具有重要的理論意義和工程實(shí)用價值。本文主要從試驗(yàn)的角度較深入地研究了鋼管輕骨料混凝土界面粘結(jié)性能。本文試驗(yàn)分兩部分,首先是以鋼管輕骨料混凝土柱試件進(jìn)行軸心推出試驗(yàn);隨后引用相關(guān)文獻(xiàn)普通鋼管混凝土粘結(jié)滑移試驗(yàn)數(shù)據(jù)與其作對比分析研究。本文具體做了以下幾方面的工作:(1)通過鋼管輕骨料混凝土柱的推出試驗(yàn),試驗(yàn)得到的位移-荷載曲線的發(fā)展有無下降段主要原因在于,鋼管輕骨料混凝土中的鋼管與核心混凝土之間的機(jī)械咬合力產(chǎn)生的最大粘結(jié)荷載大于(或小于)鋼管與核心輕骨料混凝土界面的初始摩阻力。(2)根據(jù)鋼管輕骨料混凝土推出試驗(yàn),當(dāng)構(gòu)件位移-荷載曲線發(fā)展到摩阻階段時,鋼管的緊箍系數(shù)相對越大,鋼管與核心輕骨料混凝土之間的摩阻力越大。(3)根據(jù)鋼管輕骨料混凝土推出試驗(yàn),當(dāng)試件長細(xì)比一致的情況下,緊箍系數(shù)對粘結(jié)破壞強(qiáng)度和其相應(yīng)的位移有一定的影響,構(gòu)件的緊箍系數(shù)與粘結(jié)破壞強(qiáng)度的變化相同,與其對應(yīng)位移的變化相反。(4)根據(jù)鋼管輕骨料混凝土推出試驗(yàn),鋼管輕骨料混凝土,在相同緊箍系數(shù)的情況下,長細(xì)比大的試件,其相應(yīng)粘結(jié)破壞強(qiáng)度對應(yīng)的位移大。(5)普通鋼管混凝土緊箍系數(shù)相同,粘結(jié)破壞荷載對應(yīng)位移隨長細(xì)比增大逐漸遞增,與鋼管輕骨料混凝土關(guān)于長細(xì)比與粘結(jié)破壞荷載對應(yīng)位移關(guān)系規(guī)律相同。
[Abstract]:Concrete-filled steel tube (CFST) is the abbreviation of steel tube hoop concrete. It is a kind of composite structure material which is formed by filling concrete into thin-walled steel tube, and it is a special form of restricting concrete. The concrete-filled steel tube structure has the advantages of high bearing capacity and anti-seismic performance, rapid and simple construction, less occupied space, small self-weight of the structure and good economic effect, so it has a good prospect for engineering application. Lightweight aggregate concrete in steel tube is a new type of composite structure which is filled with high strength lightweight aggregate concrete. It has the advantages of high strength, good ductility and light weight, etc. It has remarkable economic and social application benefit to popularize and apply it to bridge building engineering. The research work related to the mechanical properties of lightweight aggregate concrete filled steel tube columns requires in-depth analysis of bond-slip integral analysis and bond strength data of lightweight aggregate concrete columns in steel tubes. The relevant research work has important theoretical significance and engineering practical value for CFST columns. In this paper, the interfacial bonding behavior of lightweight aggregate concrete filled steel tube (CFST) is studied in detail from the experimental point of view. This paper is divided into two parts. Firstly, the axial push-out test is carried out with the lightweight aggregate concrete filled steel tube column, and then the common concrete-filled steel tube bond-slip test data are used for comparative analysis and analysis. The following works have been done in this paper: (1) the development of the displacement-load curve obtained from the test is mainly due to the decrease of the displacement-load curve through the push-out test of the lightweight aggregate concrete column with steel tube. The maximum bond load produced by mechanical clamping force between steel tube and core concrete in lightweight aggregate concrete filled steel tube is greater than (or less than) the initial friction resistance of the interface between steel tube and core lightweight aggregate concrete. (2) according to light steel tube, the maximum bond load is greater than or less than the initial friction resistance. Aggregate concrete push-out test, When the displacement-load curve of the member develops to the friction stage, the bigger the fastening coefficient of the steel tube is, the greater the friction resistance between the steel tube and the core lightweight aggregate concrete is. (3) according to the derivation test of the lightweight aggregate concrete of the steel tube, When the slenderness ratio of the specimen is the same, the fastening coefficient has a certain effect on the bond failure strength and its corresponding displacement, and the change of the fastening coefficient of the member is the same as that of the bond failure strength. In contrast to the corresponding displacement changes. (4) according to the test of lightweight aggregate concrete-filled steel tube (CFST), lightweight aggregate concrete (CFST), with the same fastening coefficient, has a large slenderness ratio. The corresponding displacement corresponding to bond failure strength is large. (5) the coefficient of fastening hoop of concrete filled steel tube is the same, and the corresponding displacement of bond failure load increases gradually with the increase of slenderness ratio. The displacement relation between slenderness ratio and bond failure load is the same as that of lightweight aggregate concrete in steel tube.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9

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