TY - JOUR
T1 - Development of improved loop joint applied for precast PC deck slab
AU - Hatakeyama, Shigetada
AU - Sagawa, Yasutaka
AU - Hamada, Hidenori
AU - Hino, Shinichi
AU - Masaki, Mamoru
AU - Sato, Yuji
N1 - Funding Information:
The authors express their gratitude to Nippon Expressway Research Institute Company Limited for providing advice on the test method and for valuable discussions.
Publisher Copyright:
Copyright © 2021 Japan Concrete Institute
PY - 2021
Y1 - 2021
N2 - Ordinary “loop joint” applied to precast prestressed concrete (PC) deck slab tends to increase its thickness. By decreasing this thickness, the dead load of the deck slab can be reduced. Hence, we have developed an “improved (inclined) loop joint” that reduces the deck slab thickness. This study presents the results of static bending test of slab specimens to confirm the load-carrying behavior and wheel moving load test to examine the fatigue durability of precast PC deck slabs with improved loop joints. The bending load-carrying behavior satisfied the requirements for highways in Japan. In addition, in the wheel moving load test, no sudden increase in vertical deflection and joint opening was confirmed at a load step of 250 kN × 100 000 times equivalent to 100 years on an actual bridge. Moreover, there was no water leakage at the bottom surface of the deck slab during the water-filling test. Based on the test results, it was inferred that the required load-carrying behavior and fatigue durability could be retained for 100 years in the improved loop joint.
AB - Ordinary “loop joint” applied to precast prestressed concrete (PC) deck slab tends to increase its thickness. By decreasing this thickness, the dead load of the deck slab can be reduced. Hence, we have developed an “improved (inclined) loop joint” that reduces the deck slab thickness. This study presents the results of static bending test of slab specimens to confirm the load-carrying behavior and wheel moving load test to examine the fatigue durability of precast PC deck slabs with improved loop joints. The bending load-carrying behavior satisfied the requirements for highways in Japan. In addition, in the wheel moving load test, no sudden increase in vertical deflection and joint opening was confirmed at a load step of 250 kN × 100 000 times equivalent to 100 years on an actual bridge. Moreover, there was no water leakage at the bottom surface of the deck slab during the water-filling test. Based on the test results, it was inferred that the required load-carrying behavior and fatigue durability could be retained for 100 years in the improved loop joint.
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U2 - 10.3151/jact.19.644
DO - 10.3151/jact.19.644
M3 - Article
AN - SCOPUS:85109217171
VL - 19
SP - 644
EP - 654
JO - Journal of Advanced Concrete Technology
JF - Journal of Advanced Concrete Technology
SN - 1346-8014
IS - 6
ER -