This study investigates the effectiveness of a carbon-fiber-reinforced polymer (CFRP) in enhancing load-carrying capacity steel main girder metro station. The objective is to evaluate applicability CFRPs sustaining increases applied loads and assessing their on curved surfaces. Finite element analysis (FEA) identified most stressed areas under design loads. Based FEA results, targeted strengthe...

For this purpose a finite element model specifically developed for the nonlinear analysis of steel-concrete composite beams is adopted. This finite element model includes material nonlinearity of slab concrete, reinforcement steel, beam steel as well as slabbeam nonlinear partial interaction due to the deformable shear connection. The inclusion of the partial interaction in the composite beam m...

Lamb waves in plates and in cylindrical pipes have been the subject of extensive study, largely because they propagate great distances with little attenuation, and can therefore be used to detect flaws. In this paper we report finite element simulations and experimental studies of Lamb waves in steel bridge girder geometries. In our studies the Lamb waves are generated by PZT wafer-type transdu...

Accidental damage to prestressed concrete bridge girders may occur due impact by over-height vehicles on the bottom of girder, or top flange girder be damaged during deck removal and replacement operations. Since stress checks at service loads are an important component design for beams, serviceability-based should considered when assessing structural condition girders. In this paper, step-by-s...

Based on the conceptions of energy dissipation, multi-failure and safety protection of structure, a new energy dissipation-based multi-level control system for unseating failure prevention of concrete girder bridges subjected to earthquake is proposed. The control system provides respectively two different functions including energy dissipation-based displacement restriction and unseating preve...

. This paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (FRP) composites. A total of six deep beam specimens of two different classes, as-built (unstrengthened) and retrofitted were tested in the experimental evaluation program. Two composite systems namely carbon/epoxy...

ABSTRACT: Bridges are structures built to overcome obstacles and allow continuity of transport routes. In the search for efficient construction systems, steel-concrete composite structures, especially box girder bridges, emerged. The American AASHTO European EN 1994-2-2 standards present design procedures this type bridge, but there still doubts about which portion concrete slab contributes eac...

The authors consider the determination of eigenforms a beam on elastic support parts. Elastic parts made rubber and laminated metal plates find wide use for seismic isolation bridges in earthquake-resistant construction. Determination structures is main stage when designing buildings resisting impacts. span structure girder considered as system uniformly distributed load, free vibrations which ...

In this study, A finite element model based on the third order theory is presented for the active vibration control of composite beams with distributed piezoelectric sensors and actuators. For calculating the total charge on the sensor, the direct piezoelectric equation is used and the actuators provide a damping effect on the composite beam by coupling a negative velocity feedback control algo...