Performance of UPVC Pipe Confined Concrete Columns in Compression
Performance of UPVC Pipe Confined Concrete Columns in Compression
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UPVC管约束混凝土柱的受压性能
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Naftary Gathimba
中科院分区：
文献类型：
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作者：
Naftary Gathimba
组合柱在建筑业中的应用已经有很多年了，并且具有很高的效率。这是因为组合柱提供了一个上级柱系统相比，传统的柱系统，如钢筋混凝土（RC），钢或木柱。其原因在于复合柱利用了不同材料的综合性能。钢管和纤维增强聚合物管是混凝土外包柱常用的约束介质。然而，钢面临着腐蚀问题，特别是当用于腐蚀性环境中时，而纤维增强聚合物的制造涉及相当昂贵的技术。本研究提出一种以未增塑聚氯乙烯（UPVC）塑料管约束混凝土的新型组合柱，其内填充不同强度等级的混凝土，即C30、C25、C20。管的外径为55 mm、83 mm和110 mm，
厚度分别为2.5 mm、3.0 mm和2.5 mm。复合柱的细长比为2、3和4。然后在通用试验机（UTM）上对柱进行测试，以确定其在压缩载荷下的行为。施加在试样上的载荷、变形和应变分别通过内置的测力传感器、线性可变位移传感器（LVDT）和应变计监测。结果表明，UPVC管是有效的约束混凝土，因为在所有情况下，f 'cc/f' co>1。侧限强度值增加1.18至3.65倍的无侧限强度值。填充有低强度混凝土的柱倾向于更有延展性，因为它们在破坏之前在载荷下经历了大的变形。这种大的延性意味着更大的能量吸收能力，这表明一个潜在的抗震组合柱系统。
如本研究所示，UPVC管在复合系统中具有巨大的潜力。结果是一种便宜的、更经济的轻质结构柱。该项目的主要目标受众是建筑行业中涉及建筑材料应用的个人。由于UPVC在约束柱中的使用是一个相对较新的研究领域，因此可获得的文献有限。也没有研究这些色谱柱的长期性能。
Composite columns have been used in construction industry with great efficiency for a number of years. This is because composite column offers a superior column system as compared to the conventional column systems such as Reinforced concrete (RC), steel or timber columns. The reason in that composite column utilizes the combined properties of different individual materials. Steel and fiber reinforced polymer tubes have been the commonly used confining media in concrete encased column construction. However, steel is faced with the problem of corrosion especially when used in corrosive environment while manufacture of fiber reinforced polymer involves a rather expensive technology. This research proposed a novel-type concrete-filled composite column where unplasticized polyvinylchloride (UPVC) plastic tube was used toconfine concrete.Concrete of varying class strengths namely; C30, C25, and C20 were used to fill UPVC tubes. The tubes had outer diameters of 55 mm, 83 mm and 110 mm and
thicknesses of 2.5 mm, 3.0 mm and 2.5 mm respectively. The composite columns had slenderness ratios of 2, 3 and 4. The columns were then tested on a universal testing machine (UTM) to determine their behaviour under compressive load. Applied loads, deformation and strains on the specimen were monitored through in-built load cells, Linear Variable Displacement Transducers (LVDTs) and strain gauges respectively. Results showed that UPVC pipes are effective in confining concrete, since in all cases f'cc/f'co>1. Confined strength values increased between 1.18 to 3.65 times the unconfined strength values. Columns filled with low strength concrete tended to be more ductile as since they underwent large deformations under load before failure. This great ductility implied more energy absorption capacity suggesting a potentially earthquake resistant composite column system.
There is enormous potential of UPVC tubes for use in composite systems as illustrated by this research. The resultant is a cheap, more economical type of column for light weight construction. The principal target audience for this project is individuals involved in application of building materials within the construction industry. Since the use of UPVC in confining column is a relatively new area of research, limited literature was available. Long term performance of these columns was also not studied.