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...

In this paper the parametric study is carried out to investigate the effect of number of cells in optimal cost of the non-prismatic reinforced concrete (RC) box girder bridges. The variables are geometry of cross section, tapered length, concrete strength and reinforcement of the box girders and slabs that are obtained using ECBO metaheuristic algorithm. The design is based on AASHTO standard s...

The use of unbounded tendons is common in prestressed concrete structures and evaluation of the stress increase in unbonded tendons at ultimate flexural strength of such structure has posed a great challenge over the years. Based on the bending experiment for two-span continuous post-tension beams with unbounded tendons and externally applied CFRP sheets, the monitoring of the stress increment ...

In a preceding paper (Bazant and Kim 1989), a method of probabilistic prediction of the confidence limits on long-time deflections and intemal forces of prestressed concrete segmental box-girder bridges was developed. The sampling method was used. and predictions were improved by Bayesian updating on the basis of short-time measurements. The entire analysis, including its Baye~ian aspect, was m...

In order to study the distribution of stress and deformation variable cross-section continuous box girder bridge, in this paper, finite element method is used establish model bridge. Considering layout lane load, combination working conditions calculated, bridge are analysed. The results show that maximum generally occurs at beam span middle section or support, sometimes value vehicle load poin...

This investigation aims to study the flexural behaviour of reinforced concrete (RC) beams strengthened with near-surface mounted (NSM) carbon fibre polymer prestressed prisms (CFRP-PCPs). Eight RC were tested under monotonic loading until failure load was reached. One beam un-strengthened act as a control beam. The other seven non-prestressed or NSM CFRP-PCPs. effects bond length, prestress lev...

Abstract It is well known that highway bridges are subjected to fatigue as they work under live loads with different frequencies and amplitude. The safety level for required by Brazilian codes still unknown, especially prestressed concrete girders. Also, current studies on reliability of only evaluate bending. This assesses the provided design standards a bridge, using weigh-in-motion (WIM) dat...