1. INTRODUCTION Recently, usage of headed rebar is increasing in order to decrease anchorage length and supplement complicated construct ability of bar-placement detail using ordinary hooked bars at settlement design of tension bar (Yoon et al., 2004). For bars in tension, headed bars have a shorter length than hooked bars (ompson et al., 2005; ompson et al. 2006). Aſter 2008, starting from ACI318 standard (ACI318-08, 2008) through KCI code (KCI2012, 2012) of South Korea, many countries are applying bar-placement detail of headed rebar for design criteria. However, many restrictions still exist as for regulation of stiffness of RC, strength of steel bars, variable of steel bar size, and spacing between steels caused by lack of research materials and evaluation experiment of performance using headed rebar. Especially, usage of high strength steel with over 600MPa is increasing recently, but strength steel in headed rebar is regulated not to exceed 420MPa. Design formulas of anchorage length and splice length which takes most tension from member of RC is based on experiment results about cases when crack is occurred on a joint and a settlement. Therefore, crack on concrete effect negatively on joint and settlement performance, and suggesting standard formulation on this leads to safe design. Several research result suggesting PVA fiber reinforcement is effective for reducing crack on RC (Koh et al., 2007; Ryu et al., 2007; Won et al., 2005). In this study, experiments were taken to settle the end anchorage of bottom bar of PVA fiber reinforced deep beam using headed rebar. Bottom bar is the part which takes tension for most. e variables were if there is shear span ratio and shear reinforcing bar or not. 2. DESIGN CODE (1) Anchorage of Headed and Hooked Rebar In concrete structure design code (KCI2012), the anchorage length (l dt ) of deformed headed bar and the anchorage length (l dh ) of hooked bar in tension are designed as Eq. (1) and (2), respectively. An Experimental Study on the Evaluation of Shear Performance of PVA Fiber Reinforced RC Deep Beam with High Strength Headed Rebar Seunghun Kim, Kyuseon Lee and Yongtaeg Lee Professor, Department of Architecture, Hanbat National University, Daejeon, South Korea Master’s course, Department of Architecture, Hanbat National University, Daejeon, South Korea Professor, Department of Architecture, Hanbat National University, Daejeon, South Korea https://doi.org/10.5659/AIKAR.2017.19.4.109 Abstract is study is done to evaluate how existence of shear-span ratio and shear reinforcing bar effects on shear performance from through shear experiment using PVA fiber reinforced ferroconcrete building. Ratio of shear-span was set 1, 1.7, and arrangement of shear reinforcing bar was set with KCI2012 regulation. In result, subject with less shear-span ratio, and shear reinforcing bar with arrangement of bar shows high stiffness. Subjects with high shear-span ratio show large difference depending on existence of shear reinforcing bar. erefore, theoretical shear strength followed by CEB code underestimates experimental shear strength by 43.9%. Shear strength of the deep beam with headed bars is more affected by the bearing strength of head than the bond strength of bar. Keywords: Shear-Span Ratio, PVA Fiber, Deep Beam, Shear Reinforcing Bars ARCHITECTURAL RESEARCH, Vol. 19, No. 4(December 2017). pp. 109-115 pISSN 1229-6163 eISSN 2383-5575 Corresponding Author: Yongtaeg Lee Department of Architecture, Hanbat National University, Daejeon, South Korea e-mail: [email protected] is research was supported by the research fund of Hanbat National University in 2016. (No. 201601220001) ©Copyright 2017 Architectural Institute of Korea. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http:// creativecommons. org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
An Experimental Study on the Evaluation of Shear Performance of PVA Fiber Reinforced RC Deep Beam with High Strength Headed Rebar
May 23, 2023
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