外包层约束下混凝土的强度和延性

S. Mandal, M. A. Mansur
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引用次数: 2

摘要

与圆形柱不同,长方形或壁式柱的护套由于约束不足和包裹层过早剥离,只能在强度和延性方面产生微小的改善。克服这个问题的一些可能的方法,至少是部分地,是圆角,在每一个较短的边增加一个半圆段,或产生一个椭圆形包围长方形圆柱。总共有13个这些截面形状的样品在直接压缩中进行了测试,以评估外部纤维包裹所提供的增强。已经发现,在应用纤维包覆之前,通过在其每个较短的边上包括半圆段或将截面转变为椭圆来修改矩形截面,可以大大提高强度和延性。在使用的两种纤维中,玻璃纤维复合材料在增强强度和延展性方面被证明更具成本效益。
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Strength and Ductility of Concrete Confined by External Wrap
Unlike circular columns, jacketing of oblong or wall-type columns produces only marginal improvement in strength and ductility because of inadequate confinement and premature debonding of the wrap. Some possible ways to overcome this problem, at least partially, are to round the corners, to add a semi-circular segment at each of its shorter sides or to produce an elliptical shape enclosing the oblong columns. A total of 13 specimens of these cross sectional shapes were tested in direct compression to assess the enhancement afforded by external fiber wraps. It has been found that the modification of a rectangular section by including a semi-circular segment on each of its shorter sides or transforming the section to an ellipse before applying fiber wrap leads to a substantial improvement in strength as well as ductility. Of the two fibers used, the glass fiber composite proved to be more cost effective in terms of strength and ductility enhancement.
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