Investigation on cracking performance of UHPC overlaid concrete deck at hogging moment zone of steel-concrete composite girders
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College of Civil Engineering, Hunan University, Changsha 410082, China
Guangdong Yunmao Expressway Co. Ltd., Guangzhou 525346, China
Guangdong University of Technology, Guangzhou 510006, China
Guangdong Communication Planning & Design Institute Co., Ltd., Guangzhou 510507, China
Guangdong Highway Construction Co., LTD, Guangzhou 510623, China
Submission date: 2023-05-09
Final revision date: 2023-07-10
Acceptance date: 2023-07-18
Publication date: 2023-12-21
Archives of Civil Engineering 2023;4(4):445-457
The concrete deck at the negative bending moment region of a continuous steel-concrete composite girder bridge is the weakest part of the structure. Introducing ultra-high performance concrete (UHPC) to the hogging region may overcome the shortage and break through the bottleneck. This paper explores the cracking performance of steel-concrete composite girders with concrete slabs topped by a thin layer of UHPC subjected to a negative bending moment.Areal continuous composite girder bridge is briefly introduced as the engineering background, and the cracking characteristic of the concrete deck over the middle piers of the bridge is numerically modeled. Approaches to strengthen the cracking performance of the concrete deck at the hogging region through topping UHPC overlays are proposed. The effectiveness of the approaches is examined by conducting a series of numerical and experimental tests. Numerical results indicate that the normal concrete (NC) deck near the middle forums of the bridge would crack due to the large tensile stress from negative bending moments. Replacing the top concrete with an identical-thick UHPC overlay can increase the cracking resistance of the deck under the moment. As the thickness of the UHPC overlay increased from 6.0 cm to 12.0 cm, the maximum shear stress at the UHPC overlay-to-NC substrate interface under different load combinations was decreased by 56.3%~65.3%. Experimental results show that the first-cracking load of the composite beam usingan NC-UHPC overlaid slab was 2.1 times that using an NC slab. The application of a UHPC overlaid deck can significantly improve the crack performance of the steel-concrete composite girder bridge.
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