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Cracking control technique for continuous steel-concrete composite girders under negative bending moment

Cai Min, Li Wenjie, Wan Zhiyong, Sheng Jianjun, Tan Juliang, Ma Chao

Archives of Civil Engineering

2023

Vol. 69, nr 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.

O obliczaniu kablobetonowych ciągłych dźwigarów mostowych

Abramski M., Wasilewski B.

Inżynieria i Budownictwo

2016

R. 72, nr 1

20--23

Przedstawiono analityczną metodę obliczania kablobetonowych ciągłych dźwigarów z wykorzystaniem metody sił. Podano przykład analizy zrealizowanego kablobetonowego wiaduktu o schemacie dwuprzęsłowej belki ciągłej. Porównano wyniki obliczeń analitycznych i numerycznych (model belkowy, program Sofistik).

An analytical method of calculating post-tensioned continuous beams is presented. It is based on the force method. An analysis of a realized double-span continuous beam bridge made of bonded post-tensioned concrete is presented. Results obtained from the analytical method and a numerical one (beam model in Sofistik FEM software) are compared.