Flexural capacity and ductility of lightweight concrete T‐beams

The present study aims to estimate the flexural capacity and ductility of lightweight concrete T‐beams prepared using the expanded bottom ash and dredged soil granules (LWAC‐BS beams). Eight full‐scale beams were prepared under the main parameters including the unit weight and compressive strength o...

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Veröffentlicht in:Structural concrete : journal of the FIB 2020-12, Vol.21 (6), p.2708-2721
Hauptverfasser: Yang, Keun‐Hyeok, Mun, Ju‐Hyun, Hwang, Seung‐Hyeon, Song, Jin‐Kyu
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container_issue 6
container_start_page 2708
container_title Structural concrete : journal of the FIB
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creator Yang, Keun‐Hyeok
Mun, Ju‐Hyun
Hwang, Seung‐Hyeon
Song, Jin‐Kyu
description The present study aims to estimate the flexural capacity and ductility of lightweight concrete T‐beams prepared using the expanded bottom ash and dredged soil granules (LWAC‐BS beams). Eight full‐scale beams were prepared under the main parameters including the unit weight and compressive strength of concrete and amount of longitudinal tensile reinforcement. The moment capacities and displacement ductility ratios measured for the present specimens were compared with those compiled from normal‐weight concrete (NWC) beams and lightweight concrete beams made using the expanded clay and fly ash granules (LWAC‐CF beams) with respect to the longitudinal reinforcement index (ωs). The coefficients for the equivalent rectangular stress block to assess the ultimate moment capacity of LWAC beams were formulated from the actual stress–strain curve of the concrete. The test results showed that the effect of the type of artificially expanded lightweight granules on the normalized cracking and ultimate moment capacities of LWAC beams was insignificant, whereas LWAC‐BS beams exhibited lower displacement ductility ratios than LWAC‐CF beams at the same ωs value. The maximum amount of longitudinal tensile reinforcement specified in ACI 318‐14 provision for preventing brittle failure of the beam needs to be lowered for LWAC beams. When determining the coefficients of the equivalent stress block for LWAC members, the concrete unit weight deserves consideration as a primary factor together with the compressive strength of the concrete.
doi_str_mv 10.1002/suco.201900473
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subjects beam
Compressive strength
Concrete
Concrete blocks
Dredging
Ductility
Ductility tests
Equivalence
equivalent stress block
Fly ash
Granular materials
lightweight aggregate concrete
Lightweight concretes
moment capacity
Reinforcement
Stress-strain curves
Weight reduction
title Flexural capacity and ductility of lightweight concrete T‐beams
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