Effects of prestressing strenghtening on wood-concrete composite beams

[E. Š. Maslak]

[7], 184 str.

Biografija autora: str. [185-186]. Bibliografija: str. 171-175.

Civil Engineering; Timber structures; Composite und Prestressed structures

Timber-concrete composite beams are classified as modern support systems. Originally, they arose from the need to strengthen existing bridge or slab structures made of wood. This method of strengthening the beams, where a concrete slab is installed over timber beams and connected with shear studs, has proven to be very reliable and efficient. The subject of the scientific research of this dissertation is the composite timber-concrete beams, which are reinforced with external elements for prestressing. In this way, a two-lane system was formed. The experimental part of the research included testing ten girders, which five were coupled, and five were coupled and prestressed. The static span of the tested beams was 3.0m. The experiment was conducted with two concentrated forces in 1/3 of the span (four points bending test), and was limited to short-term loading. The carrier test procedures were in accordance with the appropriate standards. Through a comparative analysis of the results obtained from the test, the degree of improvement of the reinforced beams was determined according to the parameters of the ultimate force, maximum deformations and stiffness of the girders. In addition to the experiment, numerical models were created using the finite element method in ANSYS and SAP2000 programs. The model made in SAP can be used in everyday engineering practice to prove the bearing capacity of these beams.

spregnute konstrukcije drvo-beton, vanjsko prednaprezanje, eksperimentalno ispitivanje, numerički modeli

timber-concrete composite structures, external prestressing, experimental examination, numerical models

624.016(043.3)

T220

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