Efficient Elements for Mindlin Beams and Plates
Two improvements to the conventional Mindlin two-node beam and three-node plate are presented. The first involves the order of the assumed displacement fields. The second involves simulation...

Studies of Behavior and Computer Program on Curved Bridges

Developments in the Use of Cubic B-Splines in the Compound Strip Method
A general cubic B-spline compound strip method (BCSM) has been developed to analyze thin plates, stiffened plates, folded plates, and box-girders. In the BCSM a problem is first partially...

Free Vibration of Stepped Beams
This paper addresses the free vibration of a stepped Euler-Bernoulli beam using dynamic flexibility methods. The characteristic equation of the system is derived, from which the system...

Design and Planning of Structural Steel Roll-In
Innovative construction methods were required to erect structural steel inside a 170 foot long box truss over a railroad. The contractor engineered and executed a unique system to roll...

Composite Twin Tub Bridge Erection Intersection of Interstate I-84 and I-94 in Hartford, Connecticut
Curved bridge erection requires detailed preparation by the contractor, plus a sharing of responsibility and liability between the owner, designer of the new structure and the contractor....

Lifeline Design of Bridges
An analysis and design procedure is presented for retrofitting steel girder bridges that may experience the loss of a pier or column. Multispan and continuous grider bridges are treated....

Examples of System Optimization and Reliability in Bridge Design
The objective of this paper is to present examples of system optimization and reliability in bridge inelastic design. The optimum solution is defined as the bridge of least weight, subject...

Redundancy Evaluation of Steel Girder Bridges
The focus of this paper is on the use of redundancy measures in the evaluation of bridge systems. The emphasis is on the definition of system redundancy measures suitable for use by bridge...

Reliability Estimation for Vertical Lift Gate at Emsworth Dam
The lift gates are composed of two horizontal trusses, two vertical girders, seven diaphragms, and two end frames. A critical element in the structural integrity of the lift gate is a...

Hysteresis Studies Including Post Buckling of Angle Web-Members for Truss-Type Girders
The paper presents analytical studies of the buckling capacities and hysteresis behavior of angle-web members of truss-type girders. The eccentricity between the loading point and the...

Optimization of Cable Prestresses of Cable Stayed Bridges Based on Minimum Strain Energy Criterion
In this study, an attempt is made to determine the optimum cable prestresses based on the strain energy criterion. The validity of the strain energy criterion on the optimum cable prestresses...

Fatigue and Fracture Evaluation of Riveted Bridge Members
Among the major concerns of bridge engineers today are the fatigue damages that have been accumulated in riveted members and the safety of riveted structures. Many of these structures...

A Method of Computing Impact and Fatigue Life in the Railway Steel Girder Bridge
The purpose of this paper is to investigate the dynamic interactions between an steel girder bridge and a moving freight train. A non-linear, 100-ton, freight car vehicle model and a 70-ft...

Fatigue Evaluation of a Riveted Railroad Bridge
An 83 year old railroad bridge was analyzed for fatigue based on historical records such as the original schedules. Based on the number of cycles to date, corresponding to an effective...

Application of Fiber-Composites in Civil Engineering
Two potential applications of Glass-Fiber-Reinforced-Plastics (GFRP) in civil engineering type structures are investigated: (1) GFRP rebars in concrete beams; (2) strengthening of concrete...

Aerodynamic Improvements for Plate-Girder Bridges
This paper describes the application of wind tunnel tests on plate-girder cable-stayed bridges to ensure that the cross-section will not be susceptible to wind-induced oscillations. Information...

Concrete Bridges — State-of-the-Art
The paper reviews the types of concrete bridge decks in most common use today, with particular emphasis on recent developments. Current trends in substructures and foundations are also...

Equilibrium-Serviceability Design of Hyperstatic P. C. Beams
A practical flexural design procedure for continuous prestressed concrete girders based on simulataneously ensuring specified margins of safety against both limit states of section and...

Behavior of Externally Prestressed Concrete Girders
A new technique for prestressing concrete girders is presented. The girders are externally prestressed by epoxy-bonding fiber-composite plates to the tension flange of the cambered girders....

 

 

 

 

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