ZEMCH 2019 International Conference Proceedings April.2020 | Page 161
full cycles of specified drift angle of about ��� � , ��� � ∙∙∙∙∙. The tests were terminated when the lateral
force in the post‐peak load‐deformation curve dropped to nearly 85% of the peak‐recorded load.
8
6
4
2
0
-2
-4
-6
-8
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Number of cycle
(a) Test setup
(b) Loading history
Figure 2. View of test setup and Loading history
3. Experimental Results
3.1 Lateral load versus drift angle relationsips
The lateral load vs. drift behavior measured during the experiments are presented in Fig. 3. The
quantitative value of measured yield and maximum lateral load, drift angle at yielding, maximum load
and corresponding to ultimate load are reported in Table. 4. As shown in Fig. 3, the H‐F specimen
reached the maximum strength at 399 kN in the positive direction after the yielding of the shear
reinforcement at a specimen drift angle of 2.0%. It showed relatively ductile behavior up to a drift angle
of 4.0% but showed to decrease in strength to below 85% of the maximum strength at a drift angle of
3.33%, where test was terminated. On the other hand, specimens KSS‐5 and KSS‐7 showed almost
similar behavior reached. Both specimens showed same shear reinforcement yielding drift angle of ‐
1.2% with the maximum strengths of ‐416kN and ‐425kN, for specimens KSS‐2 and KSS‐7, respectively.
In Specimen KSS‐12 with spiral reinforcement, the flexural cracks were appeared at a drift angle of 0.5%,
and specimen reached a maximum strength of ‐433kN after the yielding of the shear reinforcement at
a specimen drift angle of ‐1.3%. Compared to kSS‐5 and KSS‐7, the specimen KSS‐12 showed better
performance in terms of yielding strength and drift‐angle. No flexural reinforcement yielding or
buckling was observed in any specimen.
Experimental Study of Reinforced Concrete Columns with Confinement Effect
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