Abstract
Abstract: Anchor serves to connect steel and concrete construction that can transfer steel pull-out load to concrete. Sanko hammer drive anchor usually has been available in the model of expansion that can be installed into concrete with cast in place and post installed methods. The experiment was aimed at comparing pull out failures of Sanko hammer drive expansion anchor using cast in place and post installed installation methods based on pull-out failure behavior. Experimental data were obtained from the pull-out strength test of Sanko hammer drive expansion anchor, compressive strength test and ready-mix concrete split tensile test, adhesion strength test and group anchor pull-out test which consists of four units of anchor with diameter of 10 mm planted 90 mm depth on T concrete beams with dimension of 300 mm x 300 mm x 150 mm as many as three beams for each of them using cast in place and post installed installation methods. The results of the experiment showed that concrete compressive tension value (f’c) is 25.69 MPa, anchor tension value (fu) is 383.25 MPa, anchor adhesion tension value (μ) with cast in place method is 2.25 MPa and post installed method is 1.56 MPa. Theoretically, the damage occurred in pull-out condition; while in the experiment, the test showed a difference in pull-out capacity using cast in place installation method of 38.38 kN with deformation of 13.81 mm, which is higher than theoretical value of 26,083 kN and using post installed method of 36.62 kN with deformation of 8.89 mm, which is higher than theoretical value of 18,084 kN and the experiment indicates that the anchor is perfectly pull-out.
Highlights
Anchor has an important role in connecting steel and concrete structure components
Pull-out test results showed a force of 38.38 kN on cast in place method and 36.62 kN on post installed method
Based on the analysis of pull-out test results on specimens with anchor distance s = 100 mm, ca1 = 100 mm on concrete f’c = 25 MPa using cast in place and post installed methods that has been described, it can be concluded as follows: 1. Based on the results of theoretical analysis of anchoring failure system, the type of failure was controlled on pull-out failure because it provided the smallest force value of the four types of failures which is 26,083 kN for cast in place method and 18,084 kN for post installed method
Summary
Anchor has an important role in connecting steel and concrete structure components. The development of anchor technology has reached the expansion anchor model where the anchor can be installed when the concrete has been hardened which is known as post-installed method, and the installation of anchor before concrete casting known as cast in place method. Expansion anchor pull-out test was conducted to investigate the distribution of expansion anchor group strength on post-installed and cast in place concrete. Both methods used are reviewed based on the behavior of anchor failure due to pull-out, by pulling the expansion anchor group of hammer drive anchor type named "Sanko" amounted to 4 units with a diameter of 10 mm, planting in depth of 90 mm on ready mix concrete quality of 25 MPa on T beam of 300 mm x 300 mm x 150 mm and pulled using UTM machine, the testing is stopped when deformation continued to increase without any increase in loads
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