Abstract
One of the methods of increasing the efficiency of using prestressed reinforcement involves transferring a certain amount of longitudinal tensioned reinforcement from the tensile zone in the span to the upper compressed zone on the support, where it is not fully used to ensure the bending resistance. More effective may be a solution in which, due to the broken outline along the length of the element, the pre-stressed tendons are arranged at an angle to the longitudinal axis, creating vertical compression of the support zone and increasing the beam shear resistance. In this study presented information about stress-strain state of prestressed concrete straight and curved beams based on the experimental investigations.
Highlights
In the conditions of constantly increasing volumes of construction, an important area of research is the search for rational and cost-effective structural solutions of bearing elements of buildings that would have architectural expressiveness and meet aesthetic and psychological requirements.The use of prestressing in reinforced concrete structures allows, on the one hand, to reduce the size of the elements, which has a beneficial effect on the appearance of the building, and on its architectural and planning solutions
At the same time, prestressed concrete structures have a number of disadvantages. he main ones include an increase in the complexity of manufacturing structures associated with the need for pre-tensioning of reinforcement and an increase in the cost of the entire structure due to the use of more expensive power forms and high-strength reinforcement
In the middle of the 20th century, a number of researchers [3, 4, 5, 6] proposed a design solution in which, due to the broken outline along the length of the element, the rectilinear prestressed reinforcement is positioned at an angle to the longitudinal axis, creating vertical compression of the support zone and increasing the beam shear resistance (Figure 1)
Summary
In the conditions of constantly increasing volumes of construction, an important area of research is the search for rational and cost-effective structural solutions of bearing elements of buildings that would have architectural expressiveness and meet aesthetic and psychological requirements. Designs that combine the advantages of the methods described above can become more effective [2] The resistance of such elements in the area of maximum bending moments is provided by longitudinal tensioned reinforcement. In the middle of the 20th century, a number of researchers [3, 4, 5, 6] proposed a design solution in which, due to the broken outline along the length of the element, the rectilinear prestressed reinforcement is positioned at an angle to the longitudinal axis, creating vertical compression of the support zone and increasing the beam shear resistance (Figure 1). Despite the obvious advantages of curved outline structures, they have not found wide application in construction practice, which is due to the lack of reliable experimental and theoretical data on the stress-strain state of the elements of the broken outline, including in the shear zone
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