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Behaviour of PVC encased reinforced concrete walls under eccentric axial loading

机译:偏心轴向载荷下PVC包装钢筋混凝土墙的行为

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摘要

Stay-in-place (SIP) formwork has been used as an alternative to the conventional formwork system. The systems are mainly assembled on site, hence simplifying the construction process and reducing the construction time as the removal procedure has been eliminated. SIP formwork systems can be divided into two main categories; structural and non-structural formwork, based on their contribution to resist applied loads. The structural formwork provides the same advantages as the non-structural formwork, in addition to its contribution to resist the applied loads. As a result, the cross section and the reinforcement of the structural member can be reduced. Recently, polyvinyl chloride (PVC) has been used as a stay-in-place formwork because of its lower cost compared to other materials, durability, and ease to assemble.The PVC SIP formwork consists of interconnected elements; panels and connectors that serve as permanent formwork for the concrete walls. In this study, the behaviour of the PVC encased reinforced concrete walls under eccentric compression loading was investigated. The variables in this study were the type of the specimen (PVC encased or control), the longitudinal reinforcement (4-10M or 4-15M rebars) and the eccentricity of the applied compression load (33.87 mm, 67.73 mm and 101.6 mm). Generally, the control walls (without PVC encasement) failed by yielding of the steel followed by crushing of the concrete, or by crushing of the concrete without yielding of the steel. For the PVC encased walls, buckling of the PVC occurred after the concrete crushed. The PVC encased specimens showed a higher peak load than their peer control walls. The effect of the PVC on increasing the ultimate capacity at a given eccentricity was more significant for the walls reinforced with 4-10M than the walls reinforced with 4-15M. For the lowest reinforcement ratio (4-10M), the PVC encased specimens showed an increase in peak load by 37.2% and 17.1% at an eccentricity of 67.73 mm and 101.6 mm, respectively. When the reinforcement was increased to 4-15 M, the increase in the peak load dropped at all eccentricities to 10%. For the vertical and the mid-span deflection, the PVC encased specimens and the control specimens showed the same values. Also, the test results showed an increase in the energy absorption capacity for the PVC encased specimens compared to the controls specimens, where the effect for the walls reinforced with 4-10M was higher than the walls reinforced with 4-15M at a given eccentricity.An analytical model was developed to predict the ultimate load capacity of the specimens taking into consideration the effect of the PVC on the load carrying capacity of the walls. The provision was derived based on the moment magnification factor method in which the effect of secondary stresses associated with the column deformations was taken into consideration. The calculated capacities of the PVC encased specimens showed a conservative error of 5.9% on average.
机译:保持原位(SIP)模板已用作常规模板系统的替代方法。系统主要在现场组装,因此消除了拆卸程序,从而简化了施工过程并减少了施工时间。 SIP模板系统可以分为两个主要类别:结构和非结构模板,基于它们对施加载荷的抵抗作用。除了可抵抗施加的载荷外,结构模板还具有与非结构模板相同的优点。结果,可以减小结构构件的横截面和加强。近年来,聚氯乙烯(PVC)由于与其他材料相比成本较低,经久耐用且易于组装,因此被用作固定模板。用作混凝土墙的永久模板的面板和连接器。在这项研究中,研究了聚氯乙烯包裹的钢筋混凝土墙在偏心压缩荷载下的行为。在这项研究中的变量是试样的类型(PVC包裹或对照),纵向钢筋(4-10M或4-15M钢筋)和所施加压缩载荷的偏心率(33.87 mm,67.73 mm和101.6 mm)。通常,控制墙(不带PVC外壳)会因钢的屈服,随后的混凝土压碎或混凝土的压溃而没有钢的屈服而失效。对于包裹有PVC的墙,在混凝土压碎后会发生PVC的屈曲。聚氯乙烯包裹的样品显示出比同等对照墙更高的峰值载荷。在给定的偏心距下,PVC对增加极限承载力的影响对于4-10M增强的墙比4-15M增强的墙更为显着。对于最低的增强比(4-10M),PVC包裹的试样在67.73 mm和101.6 mm的偏心率下分别显示出峰值载荷增加了37.2%和17.1%。当钢筋增加到4-15 M时,峰值载荷的增加在所有偏心率下都下降到10%。对于垂直和中跨挠度,PVC包裹的样品和对照样品显示相同的值。同样,测试结果表明,与对照样品相比,PVC包裹的样品的能量吸收能力有所提高,在给定的偏心率下,用4-10M增强的墙的效果要比用4-15M增强的墙的效果高。考虑到PVC对墙的承载能力的影响,开发了一种分析模型来预测样品的最终承载能力。该规定是基于弯矩放大系数法得出的,其中考虑了与柱变形有关的二次应力的影响。聚氯乙烯包裹的标本的计算容量平均显示出5.9%的保守误差。

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