Abstract:Twentieth century brought a lot of forward-moving inventions. In the field of bridges and structural engineering we could witness the birth of the first steel-concrete composite bridges and their rapid development. In 1985, the perforated steel strips were officially introduced to the eyes of researchers by a patent from Wolfhardt Andrä. Encased in concrete to make composite bridges they have several advantages -low construction height, lower usage of steel in comparison with embedded I-beams, etc. In practise… Show more
“…In conclusion, the analysis presented in this paper showed an innovative type of connector with a new shape of clothoid dowel bringing advantages from previous research 1,18 . The twin connection showed a significant improvement in the shear resistance, and the possible effect of dowel shear connector placement in both slabs and bridges onto its shear resistance.…”
Section: Discussionmentioning
confidence: 66%
“…Kvočák’s research proposed a puzzle-type dowel with an inflection point (IP, see Fig. 1 b) in between two equal circles with higher teeth to base ratio as well as higher dowel height to dowel distance ratio 18 . Figure 1 The development of the design.…”
Section: Experimental Studymentioning
confidence: 99%
“…1 c), where the overlapping parts are removed from its geometry to create the clothoid dowel shape. Its aim is to enlarge the diameter of the concrete stud formed in between the dowel teeth—in comparison with both Lorenc’s 1 and Kvočák’s 18 dowel proposals (see Fig. 1 ), which should increase the shear resistance of the same height dowel.…”
The hunger for a better, more effective, more economic, easier for construction, and overall more sustainable bridge design is enormous nowadays. One of the solutions for the problems described is a steel-concrete composite structure with embedded continuous shear connectors. Such structure uses advantages of both materials (concrete in compression and steel in tension) while lowering the overall height of the structure and time of the construction. This paper presents a new design of the connector of twin dowel type, with clothoid dowel, where two dowel connectors are welded longitudinally by flanges to create one twin connector. Its geometrical attributes are closely described and the design origin is explained. The study of the proposed shear connector consists of experimental and numerical part. In experimental study, the experiments performed—four push-out tests—and their setup, instrumentation and material characteristics are described and their results in a form of load-slip curves are presented and analyzed. In numerical study the finite element model developed in ABAQUS software is presented with a detailed description of the modeling process. In results and discussions the results of the numerical study are compared with results from the experimental study and the resistance of the proposed shear connector is briefly compared to shear connectors from chosen studies.
“…In conclusion, the analysis presented in this paper showed an innovative type of connector with a new shape of clothoid dowel bringing advantages from previous research 1,18 . The twin connection showed a significant improvement in the shear resistance, and the possible effect of dowel shear connector placement in both slabs and bridges onto its shear resistance.…”
Section: Discussionmentioning
confidence: 66%
“…Kvočák’s research proposed a puzzle-type dowel with an inflection point (IP, see Fig. 1 b) in between two equal circles with higher teeth to base ratio as well as higher dowel height to dowel distance ratio 18 . Figure 1 The development of the design.…”
Section: Experimental Studymentioning
confidence: 99%
“…1 c), where the overlapping parts are removed from its geometry to create the clothoid dowel shape. Its aim is to enlarge the diameter of the concrete stud formed in between the dowel teeth—in comparison with both Lorenc’s 1 and Kvočák’s 18 dowel proposals (see Fig. 1 ), which should increase the shear resistance of the same height dowel.…”
The hunger for a better, more effective, more economic, easier for construction, and overall more sustainable bridge design is enormous nowadays. One of the solutions for the problems described is a steel-concrete composite structure with embedded continuous shear connectors. Such structure uses advantages of both materials (concrete in compression and steel in tension) while lowering the overall height of the structure and time of the construction. This paper presents a new design of the connector of twin dowel type, with clothoid dowel, where two dowel connectors are welded longitudinally by flanges to create one twin connector. Its geometrical attributes are closely described and the design origin is explained. The study of the proposed shear connector consists of experimental and numerical part. In experimental study, the experiments performed—four push-out tests—and their setup, instrumentation and material characteristics are described and their results in a form of load-slip curves are presented and analyzed. In numerical study the finite element model developed in ABAQUS software is presented with a detailed description of the modeling process. In results and discussions the results of the numerical study are compared with results from the experimental study and the resistance of the proposed shear connector is briefly compared to shear connectors from chosen studies.
“…In conclusion, the analysis presented in this paper showed an innovative type of connector with a new shape of clothoid dowel bringing advantages from previous research 1,13 . The double connection showed a significant improvement in the shear resistance, and the possible effect of dowel shear connector placement in both slabs and bridges onto its shear resistance.…”
Section: Discussionmentioning
confidence: 66%
“…Kvočák's research proposed a puzzle-type dowel with an inflection point in between two equal circles (see Fig. 1) 13 . This paper presents a clothoid-type double dowel connector with a greater radius to the connector height ratio with an aim to distribute the stress over a larger edge area and thus reduce the stresses at the connector edges.…”
The hunger for a better, more effective, more economic, easier for construction, and overall more sustainable bridge design is enormous nowadays. One of the solutions for the problems described is a composite structure with embedded steel beams in a form of a shear connector. The paper presented deals with a study of a suggested shear connector. A new design of the connector is presented - of double dowel type. Its geometrical attributes are closely described and the idea of its origin is explained. The study of the connectors consists of experimental and numerical part. In experimental study, the experiments performed together with measuring methods are described and their results are presented and analysed. In numerical study the finite element model developed in an ABAQUS software is presented with a detail description of the modeling process. In results and discussions the software results are compared to with results from the experimental study and the overall behavior of the proposed shear connector is compared to shear connectors from other studies.
Many bridges in Slovakia are reaching their designed life span these days. Due to frequent errors during the construction of those bridges as well as bad maintenance, steel‐concrete bridges are now in a critical state and urgent repairs of those structures are needed. In this article progressive methods of retrofitting existing concrete bridges are shown. In the presented method, the original pillars and original bridge deck will remain in their place, and on the existing deck new composite, steel‐concrete bridge deck with encased steel members of progressive shape will be created. This method brings significant cost reduction for such retrofitting and enables the application of increased loads on the bridge.
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