Cracking control technique for continuous steel-concrete composite girders under negative bending moment
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Guangdong Highway Construction Co., LTD, 510623 Guangzhou, China
Guangdong Yunmao Expressway Co. Ltd, 525346 Guangzhou, China
Guangdong Communication Planning & Design Institute Co., Ltd,510507 Guangzhou, China
Guangdong Communication Planning & Design Institute Co., Ltd, 510507 Guangzhou, China
Submission date: 2023-03-17
Final revision date: 2023-05-03
Acceptance date: 2023-05-09
Publication date: 2023-09-18
Archives of Civil Engineering 2023;3(3):239-251
Continuous steel-concrete composite girder can fully utilize material strength and possess large spanning ability for bridge constructions. However, the weak cracking resistance at the negative bending moment region of the girder seriously harms its durability and serviceability. This paper investigates practical techniques to improve the cracking performance of continuous steel-concrete composite girders subjected to hogging moment.Areal continuous girderwas selected as the background bridge and introduced for numerical analysis. Modeling results show that under the serviceability limit state, the principle stress of concrete slabs near the middle piers of the bridgewas far beyond the allowable material strength, producing a maximum tensile stress of 10.0 MPa. Approaches for strengthening concrete decks at the negative moment region were developed and the effectiveness of each approach was assessed by examing the tensile stress in the slabs. Results indicate that the temporary counterweight approach decreased the maximum tensile stress in concrete slabs by 22%. Due to concrete shrinkage and creep, more than 65% of the prestressed compressive stresses in concrete slabs were finally dispersed to the steel beams. A thin ultra-high performance concrete (UHPC) overlay at the hogging moment region effectively increased the cracking resistance of the slabs, and practical engineering results convicted the applicability of the UHPC technique.
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