Abstract
This study presents an experimental investigation into the behavior of lightweight aggregate concrete columns confined with transverse steel reinforcement. Twelve reinforced specimens were tested under monotonically increasing axial compressive load. Test variables considered in the study include the amount of transverse steel and the tie configuration. The results indicated that the crack pattern of confined lightweight aggregate concrete columns exhibited significant differences with the normal weight concrete specimens expressing that the failure planes passed through the coarse aggregates or occurred at the interface between the coarse aggregate and cement paste. In addition, the brittle behavior of lightweight aggregate concrete can be significantly improved by reasonably selecting the tie configuration and adding the amount of lateral steel resulting in an excellent ductile behavior. Columns confined by rectangular hoops with cross ties provide sufficient axial load–carrying capacity and ductile behavior when compared with those of specimens confined by other tie configurations during the test. An analytical model that considers the confinement effectiveness factor (λt) and coefficient k was proposed to predict the peak stress and the corresponding strain of the specimen. The model demonstrates good predictive capability when it is compared with selected models.
Highlights
Lightweight aggregate concrete (LWAC) involves several accepted advantages including better durability, higher fire-resistant capacity, and lower permeability, and it effectively reduces dead load and dimension of elements and improves seismic resistance capacity of building structures.[1,2] it is widely used in bridge engineering and high-rise building with good prospects for applications
Over the last four decades, several studies focused on examining the behavior of lateral confined normal weight concrete (NWC) columns that are subjected to School of Civil Engineering, Chang’an University, Xi’an, China
The lateral reinforcement strains and Poisson’s ratios of the LWAC specimens were relatively small, and this was in the linear elastic stage
Summary
Lightweight aggregate concrete (LWAC) involves several accepted advantages including better durability, higher fire-resistant capacity, and lower permeability, and it effectively reduces dead load and dimension of elements and improves seismic resistance capacity of building structures.[1,2] it is widely used in bridge engineering and high-rise building with good prospects for applications. The lower elastic modulus and significant shear brittle character of LWAC restrict its application in main vertical bearing components such as columns. The toughness and ductility of the vertical bearing components play an important role in preventing sudden collapse of building structures. It is generally recommended that it is necessary to provide a reasonable lateral confinement to effectively improve the toughness and ductility of confined columns. Over the last four decades, several studies focused on examining the behavior of lateral confined normal weight concrete (NWC) columns that are subjected to School of Civil Engineering, Chang’an University, Xi’an, China
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