Simulating the passive confinement of circular concrete cylinders allowing for size effect

IF 1.6 Q3 ENGINEERING, CIVIL

Australian Journal of Civil Engineering Pub Date : 2021-05-24 DOI:10.1080/14488353.2021.1926072

X. Hao, P. Visintin, D. Oehlers

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引用次数: 1

Abstract

ABSTRACT There are innumerable tests on small stocky circular cylinders with either internal passive encasement of the concrete with circular stirrups or spirals, or external passive encasement through fibre-reinforced polymer (FRP) wrapping or through the use of FRP tubes or steel tubes. These tests have shown that passive confinement can increase the strength but, in particular, can substantially increase the ductility of concrete cylinders. Because of these important benefits, the effect of passive confinement on the concrete stress/strain in a particular cylinder section is invariably derived from tests such that substantial member testing is required. In this paper, it is shown how the passive stress/strain of the concrete for a particular circular member can theoretically be determined directly from their partial-interaction shear-friction and partial-interaction bond-slip material properties for any reinforcement arrangement and geometry of the circular cylinder. This procedure provides tools for designing for the benefits of passive confinement directly without the need for member testing.

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考虑尺寸效应的混凝土圆柱体被动约束模拟

摘要：有无数的小型圆形圆柱体的试验，要么是用圆形箍筋或螺旋线对混凝土进行内部被动包裹，要么是通过纤维增强聚合物（FRP）包裹或使用FRP管或钢管进行外部被动包裹。这些试验表明，被动约束可以提高强度，但特别是可以显著提高混凝土圆柱体的延性。由于这些重要的好处，被动约束对特定圆柱体截面中混凝土应力/应变的影响总是来自于测试，因此需要进行实质性的构件测试。在本文中，展示了特定圆形构件的混凝土的被动应力/应变如何在理论上直接由其部分相互作用剪切摩擦和部分相互作用粘结滑移材料特性来确定，适用于任何钢筋布置和圆柱体几何形状。该程序提供了无需构件测试即可直接设计被动约束的工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Australian Journal of Civil Engineering ENGINEERING, CIVIL-

CiteScore

3.90

自引率

7.70%

发文量