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首页> 外文会议>Second International Conference on Concrete Under Severe Conditions Vol.2 CONSEC '98, Jun 21-24, 1998, Tromso, Norway >DUCTILITY OF RC COLUMNS RETROFITTED WITH CFRP SHEET
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DUCTILITY OF RC COLUMNS RETROFITTED WITH CFRP SHEET

机译：CFRP板改性RC柱的延性

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摘要

Carbon fiber reinforced plastic (CFRP) sheet is used as one of seismic retrofitting methods for reinforced concrete (RC) columns, but the effectiveness of the method cannot be precisely predicted because of their complex shear behavior. Two types of load carrying mechanism, that is truss and arch actions, are widely accepted for RC columns. When the truss action dominates, the CFRP placed on column web surfaces directly improves shear and drift capacities. But, when plain round bars, which are common in old buildings, are used as main reinforcement, the arch action dominates and the same effect of CFRP cannot be expected. In this paper, the stress-strain relationships of concrete stub columns reinforced with only CFRP sheet subjected to axial loading are studied and formulated as a function of the amount of reinforcement. The relationships between the column drift and the local strain in critical sections of columns are also formulated, idealizing that the drifts of plain bar reinforced columns are mainly caused by the rotational deformations on column ends. Thus, if the required load carrying capacity and mechanism of columns are specified, the ductility of CFRP reinforced columns can be predicted according to the acceptable strain in the critical section which can be given depending on the amount of reinforcement. Predicted values are compared with test results, and the method is examined in this paper.
机译：碳纤维增强塑料（CFRP）板被用作钢筋混凝土（RC）柱的抗震改造方法之一，但由于其复杂的剪切特性，无法精确预测该方法的有效性。钢筋混凝土柱广泛接受两种类型的承载机制，即桁架和拱形作用。当桁架作用占优势时，放置在柱腹板表面上的CFRP可直接提高剪切力和漂移能力。但是，当将老式建筑中常见的普通圆筋用作主要钢筋时，拱起作用占主导地位，并且无法期待CFRP的相同效果。在本文中，研究了仅用CFRP板加固的混凝土短柱在轴向荷载下的应力-应变关系，并将其公式化为加固量的函数。还建立了柱漂移和柱关键区域局部应变之间的关系，理想地认为，普通钢筋柱的漂移主要是由柱端的旋转变形引起的。因此，如果指定了所需的柱承载能力和机理，则可以根据临界截面中的可接受应变来预测CFRP增强柱的延性，该临界应变可以根据增强量来给出。将预测值与测试结果进行比较，并对该方法进行了检验。

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