tailieunhanh - Nghiên cứu thực nghiệm xác định ứng xử chịu tải trọng tập trung của bản mặt cầu bằng bê tông cốt thanh Polimer sợi thủy tinh

Bài viết trình bày nghiên cứu thực nghiệm nhằm khảo sát ứng xử của kết cấu bản mặt cầu bê tông cốt thanh GFRP có liên kết ở hai đầu. Thí nghiệm tiến hành với 04 nhóm mẫu (một nhóm sử dụng cốt thép và 3 nhóm sử dụng cốt thanh cốt sợi thủy tinh), bao gồm 12 mẫu bản mô phỏng kết cấu bản đặt trên các dầm cầu được sử dụng phổ biến tại Việt Nam. | Transport and Communications Science Journal Vol 71 Issue 8 10 2020 984-999 Transport and Communications Science Journal EXPERIMENTAL STUDY ON THE BEHAVIOUR OF CONCRETE BRIDGE DECK SLABS REINFORCED WITH GLASS-FRP BARS UNDER CONCENTRATED LOADS Nguyen Van Ngon1 Pham Duy Anh2 1 Hue college of Transport No 365 Dien Bien Phu Street Hue Vietnam 2 University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 21 7 2020 Revised 13 10 2020 Accepted 19 10 2020 Published online 28 10 2020 https Corresponding author Email Abstract. This paper presents an experimental study investigating the behavior of edge- restrained concrete bridge-deck slabs reinforced with glass fiber reinforced polymer GFRP bars. The tests with four groups one group used steel reinforced and three groups used GFRP reinforced included twelve full-scale edge-restrained concrete deck slabs simulating a slab- on-girder bridge deck commonly used in Vietnam. The deck slabs measured 2500 mm long x 2500 mm wide x 200 mm thick. The investigated parameters included 1 reinforcement type GFRP and steel and 2 reinforcement ratio in main direction of bottom layer 0 4 - 1 0 - 1 2 . The slabs were supported on two parallel steel girders and were tested up to failure under monotonic single concentrated load acting on the center of each slab over a contact area of 510x362 mm to simulate the footprint of sustained truck wheel load HL93 truck . All deck slabs failed in punching shear with carrying capacities exceeding the design service load specified by the Vietnamese Highway Bridge Design Specification TCVN 11823-17 from 1 5 to 2 2 times. The experimental punching capacities of the reinforced slabs were compared to the theoretical predictions provided by TCVN 11823-17 JSCE-97 CAN CSA S806-12 AASHTO LRFD-09 ACI . with average experimental-to-predicted punching capacity ratio ranged from 0 67 to 1 89