Application Problems of Anchor Dowels in Reinforced Concrete Shear Wall and Frame Connections

Authors: Musa H. Arslan

Abstract:

Strengthening of the existing seismically deficient reinforced concrete (RC) buildings is an important issue in earthquake prone regions. Addition of RC shear wall as infill or external walls into the structural system has been a commonly preferred strengthening technique since the Big Erzincan Earthquake occurred in Turkey, 1992. The newly added rigid infill walls act primarily as shear walls and relieve the non-ductile existing frames from being subjected to large shear demands providing that new RC inner or external walls are adequately anchored to the existing weak RC frame. The performance of the RC shear walls-RC weak frame connections by steel anchor dowels depends on some parameters such as compressive strength of the existing RC frame concrete, diameter and embedment length of anchored rebar, type of rebar, yielding stress of bar, properties of used chemicals, position of the anchor bars in RC. In this study, application problems of the steel anchor dowels have been checked with some field studies such as tensile test. Two different RC buildings which will be strengthened were selected, and before strengthening, some tests have been performed in the existing RC buildings. According to the field observation and experimental studies, if the concrete compressive strength is lower than 10 MPa, the performance of the anchors is reduced by 70%.

Keywords: Anchor dowel, concrete, damage, reinforced concrete, shear wall, frame.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1125855

References:

[1] M. H. Arslan and H. H. Korkmaz, “What is to be learned from damage and failure of reinforced concrete structures during recent earthquakes in Turkey? “Engineering Failure Analysis, 14, 1,1-22, 2006.
[2] M.H. Arslan “Determination of effective parameteres on failure load and displacement of existing RC buildings using ANN, Natural Hazards and Earth Systems Journal, 9,967-977,2009.
[3] I E Bal, “Advanced applications of the P25 - scoring method for the rapid assessment of RC Buildings”. Proceedings of the 1st ECEES, Geneva, 3-8 September, 2006.
[4] TEC-2007, Turkish Earthquake Code. Regulations on structures constructed in disaster regions. Ministry of Public Works And Settlement Ankara. 2007 (In Turkish)
[5] Arslan M.H., Goz Engiinering, Technical Report, 8p, 2016, Konya
[6] H. Kaplan and S. Yılmaz “Seismic Strengthening of Reinforced Concrete Buildings, Earthquake-Resistant Structures – Design”, Assessment and Rehabilitation, Prof. Abbas Moustafa ISBN: 978-953-51-0123-9, 2012
[7] Turkish Building Code, TBC-500-2000, Ankara (In Turkish)
[8] H. Özkul, M. Mutlu and A.R. Sağlam, Concrete Anchors, Technical Bulletin, 4, 2001. (In Turkish)
[9] T. Gürbüz, E. Seyhan, A. İlki and N. Kumbasar, Tensile Behavior of Anchors used in Reinforced Concrete Strengthening, 6. National Earthquake Conference, 16-20 October, 2007, Istanbul. (In Turkish)
[10] R.A. Cook ve R.C. Konz, Factors influencing bond strength of adhesive anchors, ACI Structural Journal, Technical Paper, 2001.
[11] T. Özturan, M. Gesoğlu, M. Özel and E. Güneyisi, Behavior of anchors under tension and shear loading, Turkish Chamber of Civil Engineers Teknik Dergi, 3105-3124, 208, 2004. (In Turkish)
[12] T. Gürbüz, Investigation of the tensile loading behavior of chemical anchors used for strengthening of reinforced concrete building, MSc Thesis, Istanbul Technical University, 2007.
[13] Rao A., Arora J., Strength and Modes of Failure of Adhesive Anchors in Confined Concrete Under Direct Tensile Loading, VIII International Conference on Fracture Mechanics of Concrete and Concrete Structures FraMCOS-8
[14] TEC-1975, Turkish Earthquake Code Regulations on structures constructed in disaster regions. Ministry of Public Works And Settlement Ankara. 1975 (In Turkish).
[15] TEC-1998, Turkish Earthquake Code Regulations on structures constructed in disaster regions. Ministry of Public Works And Settlement Ankara. 1998 (In Turkish).