The monitoring of a precast, prestressed girder bridge during fabrication and service provided the opportunity to observe temperature variations and to evaluate the accuracy of calculated strains and cambers. The use of high curing temperatures during fabrication affects the level of prestress because the strand length is fixed during the heating, the coefficients of thermal expansion of steel ...

Some of the advantages that results from the structural strengthening of concrete slabs using prestressed fiber reinforced polymer (FRP) systems are as follows: the prestressed FRP delays the formation and propagation of cracks, and both the serviceability and the flexural capacity are increased. In this research program, the flexural performance of a concrete slab strengthened with a three-sta...

in this paper, moment-curvature behavior and ductility of prestressed concrete members based on nonlinear analysis is investigated. influence of various design parameters on ductility of flexural members is determined according to appropriate materials models for stress-strain curves of concrete, prestressing steel and conventional reinforcements. parameters studied include reinforcing index (ω...

Local prestressing of reinforcement can be effective for slender reinforced concrete columns with large longitudinal force eccentricities. This article deals prestressed on the side opposite to eccentricity force. Prestressing is created help turnbuckles. The aim work develop a model determining stress–strain state local prestress and its experimental verification. presents derivation resolving...

the current study is focused on strengthening of reinforced concrete (rc) beams using cfrp straps installed in pre-cut grooves. the method which is referred as near surface mounted (nsm) benefits considerable advantages in comparison with the conventional externally bonded reinforcement (ebr) method and provides better normal and shear stress transfer between the frp and concrete substrate. the...

Abstract Apart from the general state of the tendon the quantity of the stress in the prestressed steel is of prime importance for the safety assessment of prestressed structures and/or anchor systems. On account of precaution reasons it was necessary to create a reliable, sturdy and competitive measuring device for the direct stress monitoring in prestressing steel elements being used in sensi...

The prestressing force is transferred to the concrete during the slack period of precast concrete structures fabrication. To contribute to a better understanding of the armor compliant behaviors during the mentioned process, a custom quasidistributed Bragg Grating optical fiber sensor system is designed, fabricated and embedded into a prestressed concrete prismatic beam. The experimental works,...

A prestressing procedure for reduction of adhesive peel and shear stresses at the leading edge of a skin–flange assembly is analyzed for tensile and bending loads applied to the skin. Both an analytical solution based on the Green’s functions and a finite element solution are presented for specific examples, together with design diagrams. Substantial shear and peel stress reductions are obtaine...