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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 88
PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping and M. Papadrakakis
Paper 221

A Study on the Application of Expansion Anchor Reinforcement in Construction Engineering

Y.C. Shiau1, C.S. Huang2 and P.L. Yen1

1Institute of Construction Management, Chung Hua University, Hsinchu, Taiwan
2Bureau of Urban Development, Hsinchu City Government, Taiwan

Full Bibliographic Reference for this paper
Y.C. Shiau, C.S. Huang, P.L. Yen, "A Study on the Application of Expansion Anchor Reinforcement in Construction Engineering", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 221, 2008. doi:10.4203/ccp.88.221
Keywords: mechanical anchor, expansion anchor, expansion anchor reinforcement.

Summary
Reinforced concrete (RC) is currently the most important and most extensively used structural material in civil and construction engineering [1]. In the structure of RC, the characteristics of the concrete are well known for its compressive resistance and coverage of the steel bars for the prevention of rust. Since the expansion coefficients of the two materials are similar to each other, and the advantages of each material can be utilized for mutual benefit, the two materials (i.e. steel bars and concrete) are ideal materials for structures. However, since hooks are used for the anchors of the steel, these anchors are often placed at column and beam connections where dense steel bars are located. This causes restricted space, difficulty in construction, inconvenient placement and compaction of concrete, as well as the generation of "honeycombs" at beam soffits, which results in inferior construction quality of the structures.

In the structure of RC, mechanical anchors are adopted at locations with additional reinforcement to replace the hook anchorage, and it represents a feasible measure. However, Article 12.6 of the ACI318-05 Design Code [2] and Article 12.6.4 of the ACI318-08 Design Code [3] specify that the adequacy of mechanical anchors must be tested and verified, and may only be adopted for utilization after qualifications. This study discusses the property specification, applicable scope, test results, analysis of improving engineering ability and analysis of cost savings for expansion anchor reinforcement. The objective is to study and analyze the feasibility of using the expansion anchor, to decide a feasible alternative solution. Such solution will provide the construction companies with a feasible program to solve the problem of difficult steel work on structures with greater steel consumption, as well as the problem of quality due to bad placement and compaction of concrete.

This study discusses the shape, dimension, and chemical properties, test of pull-out performance and analysis of cost variance for expansion anchor reinforcements. The test results for shape and dimension comply with the requirements of the dimension scope for the expansion anchor. The chemical property results comply with the JIS and CNS codes. The mechanical property results comply with the JIS code. The pull-out performance results indicate that the expansion anchor has the same tensile strength as 180° hooks, and the tensile strength are superior.

References
1
Cho-Fu Wu, Chi-Tung Yeh, "Construction Methods and Works", Vol. 1-2, revised edition, 2003.
2
ACI Committee 318, "Building Code Requirements for Structural Concrete (ACI318-05) and Commentary (ACI318R-05)", American Concrete Institute, Farmington Hills, Michigan, October 2005.
3
ACI Committee 318, "Building Code Requirements for Structural Concrete (ACI318-08) and Commentary (ACI318R-08)", American Concrete Institute, Farmington Hills, Michigan, October 2008.

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