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Flexural behavior of fully prefabricated large-cantilevered high strength steel-UHPC composite bent caps
Abstract In order to reduce the excessive self-weight and solve the difficulties involved in precast and assembly of conventional concrete bent caps, a conceptual design of the fully prefabricated large-cantilevered high strength steel-UHPC composite bent cap was proposed. Techno-economic analysis shows that the composite bent cap is at an advanced level in terms of the self-weight, cost, structural height, time consumption in construction, etc. In this paper, two pieces of large-scaled (1:4) composite bent cap specimens were manufactured by using high strength steel and normal strength steel, respectively. The specimens were tested under the four-point flexural loading pattern to investigate the flexural behavior. The test results show that the steel box and the UHPC bottom slab of the composite bent cap were firmly connected with each other and the relative interfacial slip was small. The failure of the specimens was characterized by crushing of UHPC. The specimen in which the steel box girder adopted high-strength steel was revealed to have a higher flexural capacity and lower ductility compared to the specimen with normal-strength steel. On the basis of the test results, a theoretical calculation method was proposed for prediction of the ultimate flexural capacity of the steel-UHPC composite bent cap, and the applicability of the theoretical calculation method was verified by the test results. Thus, the method will facilitate the structural design and analysis for the flexural bearing capacity of the new composite bent cap. In practical application, the cost and self-weight of the new composite bent cap can be well controlled to a satisfactory level by rationally choosing the steel grade and cap height.
Highlights Conceptual design of fully prefabricated large cantilevered high strength steel-UHPC composite bent caps. Comparison of technical and economic indexes between composite bent cap and other three existing bent caps. Flexural behavior of the fully prefabricated large cantilevered high strength steel-UHPC composite bent cap. Theoretical calculation method of flexural bearing capacity of composite bent cap.
Flexural behavior of fully prefabricated large-cantilevered high strength steel-UHPC composite bent caps
Abstract In order to reduce the excessive self-weight and solve the difficulties involved in precast and assembly of conventional concrete bent caps, a conceptual design of the fully prefabricated large-cantilevered high strength steel-UHPC composite bent cap was proposed. Techno-economic analysis shows that the composite bent cap is at an advanced level in terms of the self-weight, cost, structural height, time consumption in construction, etc. In this paper, two pieces of large-scaled (1:4) composite bent cap specimens were manufactured by using high strength steel and normal strength steel, respectively. The specimens were tested under the four-point flexural loading pattern to investigate the flexural behavior. The test results show that the steel box and the UHPC bottom slab of the composite bent cap were firmly connected with each other and the relative interfacial slip was small. The failure of the specimens was characterized by crushing of UHPC. The specimen in which the steel box girder adopted high-strength steel was revealed to have a higher flexural capacity and lower ductility compared to the specimen with normal-strength steel. On the basis of the test results, a theoretical calculation method was proposed for prediction of the ultimate flexural capacity of the steel-UHPC composite bent cap, and the applicability of the theoretical calculation method was verified by the test results. Thus, the method will facilitate the structural design and analysis for the flexural bearing capacity of the new composite bent cap. In practical application, the cost and self-weight of the new composite bent cap can be well controlled to a satisfactory level by rationally choosing the steel grade and cap height.
Highlights Conceptual design of fully prefabricated large cantilevered high strength steel-UHPC composite bent caps. Comparison of technical and economic indexes between composite bent cap and other three existing bent caps. Flexural behavior of the fully prefabricated large cantilevered high strength steel-UHPC composite bent cap. Theoretical calculation method of flexural bearing capacity of composite bent cap.
Flexural behavior of fully prefabricated large-cantilevered high strength steel-UHPC composite bent caps
Shao, Xudong (author) / Zeng, Huaqiao (author) / Cao, Junhui (author)
2023-02-09
Article (Journal)
Electronic Resource
English
Prefabricated high-strength steel-UHPC combined bent cap and construction method thereof
| European Patent Office | 2024