FRP约束薄壁圆钢管再生混凝土长柱轴压性能研究

发布时间：2018-06-27 23:13

本文选题：FRP钢管再生混凝土柱 + 极限承载力　；参考：《东华理工大学》2015年硕士论文

【摘要】：近几年,国家大力发展基础设施建设,房地产行业也迅猛发展,相应的旧建筑大量拆除,这些将产生大量的建筑垃圾,这些建筑垃圾对我们生活的自然环境产生严重的影响。另一方面,新建将需要大量的建筑材料,但是河砂、砾石、淡水等资源是不可再生资源。如何合理地处理这些废弃建筑材料,达到循环再利用的目的,缓解砂石和其他自然资源的需求,满足可持续发展,受到越来越多学者和工程师们的关注。近年来,科研人员陆续开展了一些再生建筑材料的专题研究,特别是在再生混凝土方面的研究尤为突出。通过对废弃建筑垃圾进行破碎加工,生产出配置混凝土所需要的粗细骨料。但在研究中,人们发现再生骨料存在许多不足之处,比如:它的力学性能较差,变异性很大,拌合成的再生混凝土强度也很低。为了使这些废弃混凝土的使用更有效,实现对其力学性能和经济性最大化。许多学者认为通过使用组合结构原理,即把再生混凝土灌入一定大小的钢管中并振捣密实,形成钢管再生混凝土,通过该方法,利用钢材抗拉强度大和混凝土抗压强度好的优势,可以提高混凝土的力学性能,全面发挥混凝土和钢材的协作性。通过工程应用和实验室的大量研究,人们发现这种结构形式的局限性。例如:在进一步增加荷载,而结构的受力面积不可相应地增加,需要加大钢管壁厚来实现承载能力的需求,这样导致项目成本提高,另外其抗腐蚀性能、防火、抗地震作用有限。所以科研人员考虑是否存合适的方法,既能满足构件荷载要求,又不改变原构件外观形状,并且成本较低还弥补钢材多方面缺陷的方法?基于此设想,科研人员通过在钢管混凝土外面包裹FRP材料,利用FRP材料具有高强的抗拉性能来约束构件的横向应变,增加组合构件的承载力,起到增强作用。FRP约束钢管再生混凝土是在钢管外缠绕FRP材料,利用钢管和FRP材料对核心混凝土的双重约束,从而提高构件的承载力。因此,本文通过实验研究,理论分析及有限元分析,对FRP约束薄壁圆钢管再生混凝土长柱轴压性能进行研究,分析了再生混凝土取代率,组合柱的长细比,FRP包裹层数和包裹方式等因素对该新型柱力学性能的影响。
[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.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9

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