本文選題：FRP鋼管再生混凝土柱 + 極限承載力��； 參考：《東華理工大學》2015年碩士論文

【摘要】：近幾年,國家大力發(fā)展基礎(chǔ)設(shè)施建設(shè),房地產(chǎn)行業(yè)也迅猛發(fā)展,相應的舊建筑大量拆除,這些將產(chǎn)生大量的建筑垃圾,這些建筑垃圾對我們生活的自然環(huán)境產(chǎn)生嚴重的影響。另一方面,新建將需要大量的建筑材料,但是河砂、礫石、淡水等資源是不可再生資源。如何合理地處理這些廢棄建筑材料,達到循環(huán)再利用的目的,緩解砂石和其他自然資源的需求,滿足可持續(xù)發(fā)展,受到越來越多學者和工程師們的關(guān)注。近年來,科研人員陸續(xù)開展了一些再生建筑材料的專題研究,特別是在再生混凝土方面的研究尤為突出。通過對廢棄建筑垃圾進行破碎加工,生產(chǎn)出配置混凝土所需要的粗細骨料。但在研究中,人們發(fā)現(xiàn)再生骨料存在許多不足之處,比如:它的力學性能較差,變異性很大,拌合成的再生混凝土強度也很低。為了使這些廢棄混凝土的使用更有效,實現(xiàn)對其力學性能和經(jīng)濟性最大化。許多學者認為通過使用組合結(jié)構(gòu)原理,即把再生混凝土灌入一定大小的鋼管中并振搗密實,形成鋼管再生混凝土,通過該方法,利用鋼材抗拉強度大和混凝土抗壓強度好的優(yōu)勢,可以提高混凝土的力學性能,全面發(fā)揮混凝土和鋼材的協(xié)作性。通過工程應用和實驗室的大量研究,人們發(fā)現(xiàn)這種結(jié)構(gòu)形式的局限性。例如:在進一步增加荷載,而結(jié)構(gòu)的受力面積不可相應地增加,需要加大鋼管壁厚來實現(xiàn)承載能力的需求,這樣導致項目成本提高,另外其抗腐蝕性能、防火、抗地震作用有限。所以科研人員考慮是否存合適的方法,既能滿足構(gòu)件荷載要求,又不改變原構(gòu)件外觀形狀,并且成本較低還彌補鋼材多方面缺陷的方法?基于此設(shè)想,科研人員通過在鋼管混凝土外面包裹FRP材料,利用FRP材料具有高強的抗拉性能來約束構(gòu)件的橫向應變,增加組合構(gòu)件的承載力,起到增強作用。FRP約束鋼管再生混凝土是在鋼管外纏繞FRP材料,利用鋼管和FRP材料對核心混凝土的雙重約束,從而提高構(gòu)件的承載力。因此,本文通過實驗研究,理論分析及有限元分析,對FRP約束薄壁圓鋼管再生混凝土長柱軸壓性能進行研究,分析了再生混凝土取代率,組合柱的長細比,FRP包裹層數(shù)和包裹方式等因素對該新型柱力學性能的影響。
[Abstract]:In recent years, the country vigorously develops the infrastructure construction, the real estate industry also develops rapidly, the corresponding old buildings are demolished in large quantities, which will produce a large amount of construction waste, which has a serious impact on the natural environment of our life. On the other hand, new construction will require a lot of building materials, but river sand, gravel, fresh water and other resources are non-renewable resources. More and more scholars and engineers pay more and more attention to how to deal with these waste building materials reasonably, to achieve the purpose of recycling and reuse, to alleviate the demand of sand and other natural resources and to meet the sustainable development. In recent years, researchers have carried out some special research on recycled building materials, especially in recycled concrete. By crushing and processing the waste construction waste, the coarse aggregate needed to deploy concrete is produced. However, it is found that recycled aggregate has many disadvantages, such as poor mechanical properties, high variability and low strength of recycled concrete. In order to make the use of these waste concrete more effective, the mechanical properties and economy of the waste concrete can be maximized. Many scholars think that by using the principle of composite structure, that is, pouring recycled concrete into a steel tube of a certain size and compacting it with vibration, the recycled concrete of steel tube can be formed by this method. The advantages of high tensile strength of steel and good compressive strength of concrete can improve the mechanical properties of concrete and give full play to the cooperation between concrete and steel. The limitations of this structural form have been discovered through engineering applications and a great deal of laboratory research. For example, if the load is further increased, the bearing area of the structure cannot be increased correspondingly, the need to increase the wall thickness of the steel tube to realize the bearing capacity is needed, which will lead to the increase of the cost of the project, in addition to its corrosion resistance and fire resistance, Earthquake resistance is limited. So the researchers consider whether there are suitable methods to meet the load requirements of the members without changing the appearance of the original members and the lower cost and to compensate for the various defects of steel. Based on this assumption, by wrapping FRP material outside concrete-filled steel tube and using FRP material with high tensile strength, the lateral strain of the member is restrained and the bearing capacity of the composite member is increased. FRP confined steel tube recycled concrete is wound with FRP material outside the steel tube, and the double confinement of steel tube and FRP material to the core concrete is used to improve the bearing capacity of the members. Therefore, through experimental research, theoretical analysis and finite element analysis, the axial compression behavior of regenerated concrete filled thin-walled circular steel tube columns confined by FRP is studied, and the replacement ratio of recycled concrete is analyzed. The influence of the aspect ratio of the composite column, the number of FRP coating layers and the encapsulation mode, on the mechanical properties of the new column.
【學位授予單位】：東華理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU398.9

【參考文獻】

相關(guān)期刊論文 前1條

1 陶忠,莊金平,于清;FRP約束鋼管混凝土軸壓構(gòu)件力學性能研究[J];工業(yè)建筑;2005年09期

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本文編號：2075635