Effects of the Replacement Length of Concrete with ECC on the Cyclic Behavior of Reinforced Concrete Columns.

Jung-Hwan Hyun,Yun-Yong Kim,Jin-Wook Bang,Bang-Yeon Lee

doi:10.3390/ma14133542

Abstract

This paper presents an experimental investigation on the effects of the replacement length of concrete with engineered cementitious composites (ECC) on the cyclic behavior of a reinforced concrete (RC) column. A conventional RC column specimen and two RC composite columns designed with ECC were fabricated. To investigate the cyclic behavior of each specimen, a series of cyclic loading tests was performed under a reversed cyclic loading condition with a constant axial load. Test results showed that ECC columns exhibited higher cyclic behavior in terms of load carrying capacity, ductility, and energy dissipation capacity compared to the RC column. It was also found that when applying ECC to the column specimen with a length of 3.6d or more, the energy dissipation capacity was greatly increased.

Highlights

As the economic growth and development of construction technology has been rapidly expanding recently, there has been an increasing demand for huge structures, such as highrise buildings, long span bridges, and huge underground structures
engineered cementitious composite (ECC) shows high tensile ductility based on multiple micro-cracks by incorporating synthetic fibers below 2 vol.%; the micromechanics and steady-state cracking theory are adopted for its material selection and mixture design [3,4,5,6]
In the reinforced concrete (RC) specimen, the Failure initial flexural crack occurred in columns within 1.0d from the columnbase joint at the lateral displacement of 4.3 mm.ofAdditional flexuralafter cracksthe appeared

Summary

Introduction

As the economic growth and development of construction technology has been rapidly expanding recently, there has been an increasing demand for huge structures, such as highrise buildings, long span bridges, and huge underground structures. Concrete is one of the most widely used construction materials in the construction industry due to its low cost and durability, it has drawbacks, such as low tensile strength, which is approximately 10% of its compressive strength, and inherent brittle failure under tension load. An engineered cementitious composite (ECC) has been developed to overcome the inherent disadvantages of normal concrete [1,2]. ECC shows high tensile ductility based on multiple micro-cracks by incorporating synthetic fibers below 2 vol.%; the micromechanics and steady-state cracking theory are adopted for its material selection and mixture design [3,4,5,6]. Many researchers have tried to utilize this material in structural members and retrofitting [7,8,9,10,11,12,13,14,15].

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