Prestressed concrete girders are prone to the formation of horizontal end cracks during prestress transfer. These propagate and progress extensively in deeper hollow-type pretensioned with larger prestressing forces. This study examines strand-debonding method eliminate at ends hollow–type by directly reducing vertical tensile stresses resulting from release acting on strands. Finite element an...

This paper investigates the analytical results of seismic response multi-span prestressed concrete (PSC) I-girder bridges under loads. To perform numerical analyses, a three-span PSC bridge with width 12 m, total length 100 and maximum span 40 m was modeled, virtual location selected to consider soil properties area where constructed. The load acting on applied in consideration around pier wave...

Abstract An extradosed cable‐stayed bridge employs a structure that combines the main elements of both prestressed box girder and bridge. In to apply optimization, because this type has hybrid nature; bridges have significant additional complexity oversizing [7]. This research paper evaluated optimum depth with pylon height, angle stay cable, effect concrete grade on those three parameters an c...

This paper deals with the economic optimization of prestressed concrete precast pedestrian bridges typically used in public works construction. These bridges are made of a precast concrete beam that integrates an upper reinforced concrete slab for the pedestrian traffic. The beam has a U-shape cross-section. Typical span lengths range from 20 to 40 m and the width ranges from 3.00 to 6.00 m. Th...

This paper summarizes the recent work by the first author’s research group related to vehicle effects on existing bridges, using reliability based performance assessment. The first part presents a simulation framework of fatigue reliability assessment for existing bridges considering the effects of vehicle speed, road roughness condition, equivalent stress range and the constant amplitude fatig...

Geometric nonlinearity of self-anchored cable-stayed suspension bridges is studied in this paper. The repercussion of shrinkage and creep of concrete, rise-to-span ratio, and girder camber on the system is discussed. A self-anchored cable-stayed suspension bridge with a main span of 800 m is analyzed with linear theory, second-order theory, and nonlinear theory, respectively. In the condition o...

This paper presents a multi-functional strand capable of introducing prestressing force in prestressed concrete (PSC) girders and sensing their static dynamic behavior as well. innovative is developed by replacing the core steel wire used PSC structures with carbon fiber-reinforced polymer (CFRP) built-in optical Fiber Bragg Grating (FBG) sensor. A full-scale girder specimen was fabricated appl...

in order to lighten the prestressed concrete solid members, nowadays, it is possible to make use of the advantage of hpc (fc'>60 mpa) as well as replacing the solid section with a psc thin-walled section for certain members such as circular and box columns. using the strength theory of aci, a numerical procedure along with a computer program was developed for the analysis of such sections ...

In this paper, two sets of comparative fatigue tests on weathering steel-concrete composite girders were carried out in the context girder bridges. The load-deflection relationship under loading different environments was investigated contrastively. experimental results show that coupled effect corrosive environment and load, steel still shows obvious corrosion; simple load has no significant s...