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Design of Rectangular HSC Columns for Ductility

机译：矩形HSC柱的延展性设计

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In most design codes (1, 2, 3) provisions for the design of confinement reinforcement contain empirical constants that were based on the experimental data available in the literature. Most of the data used was from tests in which normal strength concrete columns with square cross sections were used. Only recently, a limited amount of experimental data on high strength concrete (HSC) columns has become available. Experimental data on rectangular HSC column behavior, on the other hand, is rarely found in literature, especially on large size HSC specimens tested under moderate to high axial load levels and subjected to large inelastic displacement excursions. This paper presents results from a continuing research program which aims to study confinement of concrete by lateral reinforcement. The current work deals with the experimental behavior of HSC (52 MPa ≤f_c'≤ 112 MPa) columns having rectangular cross sections. Large-size columns (250 x 350 x 1473 mm) with heavy stubs (508 x 762 x 813 mm) were tested under moderate to high axial load levels and reversed cyclic displacement excursions. Effects of several variables such as section geometry, axial load level, and amount of lateral reinforcement on the behavior of these specimens are studied, and the responses of the rectangular specimens are compared to those of specimens with square cross sections. It is concluded that HSC columns having square and rectangular cross sections can be designed to behave in a ductile manner, provided that sufficient amount of confinement reinforcement is used in an efficient configuration.
机译：在大多数设计规范（1、2、3）中，用于约束加强设计的规定都包含经验常数，这些常数基于文献中提供的实验数据。所使用的大多数数据来自使用方形截面的普通强度混凝土柱进行的测试。直到最近，有关高强度混凝土（HSC）柱的实验数据仍然有限。另一方面，关于矩形HSC柱行为的实验数据很少见于文献中，尤其是在中等至高轴向载荷水平下进行且经受较大的非弹性位移偏移的大型HSC试样上。本文介绍了一项持续研究计划的结果，该计划旨在研究侧向加固对混凝土的限制。当前的工作是处理具有矩形横截面的HSC（52 MPa≤f_c'≤112 MPa）色谱柱的实验行为。在中等至高的轴向载荷水平和反向循环位移偏移下，测试了带有重截头（508 x 762 x 813 mm）的大型色谱柱（250 x 350 x 1473 mm）。研究了截面几何形状，轴向载荷水平和侧向钢筋数量等变量对这些试样行为的影响，并比较了矩形试样和方形截面试样的响应。结论是，只要在有效构型中使用足够数量的约束加强，可以将具有方形和矩形横截面的HSC立柱设计为具有延性。

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