Journal of Bridge Engineering 

About: Journal of Bridge Engineering is an academic journal published by American Society of Civil Engineers. The journal publishes majorly in the area(s): Girder & Bridge (interpersonal). It has an ISSN identifier of 1084-0702. Over the lifetime, 2741 publications have been published receiving 58638 citations. The journal is also known as: ASCE journal of bridge engineering.

Strengthening of a steel bridge girder using cfrp plates

Abstract: For bridge owners faced with a rising number of structurally deficient steel bridges, the rehabilitation of steel girders using advanced composite materials offers an attractive solution for short-term retrofit or long-term rehabilitation. Several laboratory studies conducted at the University of Delaware have shown that carbon fiber-reinforced polymer (CFRP) plates can be used to effectively strengthen steel bridge girders. Initial studies focused on several issues including the effect on global stiffness and strength, bond force transfer and development, and environmental and fatigue durability of the CFRP/steel bond. Once the feasibility of the strengthening procedure had been thoroughly examined, strengthening of an existing steel bridge girder was performed. This paper reviews the research conducted to date, and presents details of a demonstration of this technology performed on a bridge located on Interstate 95 in Newark, Del.

London millennium bridge: pedestrian-induced lateral vibration

Abstract: The London Millennium Footbridge is located across the Thames River in Central London. At its opening on June 10, 2000, the bridge experienced pedestrian-induced lateral vibration. Observations on the day of opening and studies of video footage revealed up to 50 mm of lateral movement of the south span and 70 mm of the center span. The north span did not move substantially. The bridge was closed on June 12, 2000, pending an investigation into the cause of the unexpected lateral movements. This paper highlights the phenomenon of pedestrian-induced lateral vibration on footbridges and the current state of knowledge of the lateral loading effect. Modification of the bridge, introducing extensive passive damping, is currently underway with completion scheduled for the end of 2001.

Cyclic Response of Unbonded Posttensioned Precast Columns with Ductile Fiber-Reinforced Concrete

Abstract: A precast segmental concrete bridge pier system is being investigated for use in seismic regions The proposed system uses unbonded posttensioning (UBPT) to join the precast segments and has the option of using a ductile fiber-reinforced cement-based composite (DRFCC) in the precast segments at potential plastic hinging regions The UBPT is expected to cause minimal residual displacements and a low amount of hysteretic energy dissipation The DFRCC material is expected to add hysteretic energy dissipation and damage tolerance to the system Small-scale experiments on cantilever columns using the proposed system were conducted The two main variables were the material used in the plastic hinging region segment and the depth at which that segment was embedded in the column foundation It was found that using DFRCC allowed the system to dissipate more hysteretic energy than traditional concrete up to drift levels of 36% Furthermore, DFRCC maintained its integrity better than reinforced concrete under high cyclic tensile-compressive loads The embedment depth of the bottom segment affected the extent of microcracking and hysteretic energy dissipation in the DFRCC This research suggests that the proposed system may be promising for damage-tolerant structures in seismic regions

Bridge Reliability Assessment Based on Monitoring

Abstract: During the past decade, monitoring concepts for structural systems have been subjected to a rapid development process. They have become more and more important in the intervention planning (e.g., maintenance, repair, rehabilitation, replacement) on new and existing structures. Nevertheless, there is still a strong need for the efficient use of structural monitoring data in the reliability assessment and prediction models. Updating prediction models, based on monitoring data, affect the intervention strategies. Since these strategies involve costs, monitoring systems assist the efficient spending of available budgets. Therefore, the demand for the efficient use of monitoring data is not only related to structural reliability, but also to cost aspects. In an extended sense, structural monitoring can be considered similar to quality assurance and acceptance sampling, since it is not practically possible to continuously monitor all performance indicators in all critical sections of an entire structural system...

Assessment of highway bridge upgrading by dynamic testing and finite-element model updating

Abstract: The Land Transport Authority of Singapore has a continuing program of highway bridge upgrading for refurbishing and strengthening bridges to allow for increasing vehicle traffic and increasing axle loads. One subject of this program has been a short-span bridge taking a busy main road across a coastal inlet near a major port facility. Experiment-based structural assessments of the bridge were conducted before and after upgrading works including strengthening. Each assessment exercise comprised three separate components: ~1! a strain and acceleration monitoring exercise lasting approximately one month; ~2! a full-scale dynamic test carried out in a single day without closing the bridge; and ~3! a finite-element model updating exercise to identify structural parameters and mechanisms. This paper presents the dynamic testing and the modal analysis used to identify the vibration properties and the quantification of the effectiveness of the upgrading through the subsequent model updating. Before and after upgrade, similar sets of vibration modes were identified, resem- bling those of an orthotropic plate with relatively weak transverse bending stiffness. Conversion of bearings from nominal simple supports to nominal full fixity was shown via model updating to be the principal cause of natural frequency increases of up to 50%. The utility of the combined experimental and analytical process in direct identification of structural properties has been proven, and the procedure can be applied to other structures and their capacity assessments.