Cellular and Voided Slab Bridges
Bridges of the cellular and voided slab type are explored. These types of bridges have either rectangular or circular holes running in the direction of the bridge span. In these structures...

Steel Struts under Severe Cyclic Loadings
An experimental study is presented of the inelastic behavior of axially loaded steel members subjected to repeated buckling and stretching. Tests on 24 commercially available steel struts...

Shear Lag in Box Girders
An initial approximate method is presented to evaluate the shear lag phenomenon in reinforced concrete single-box girder bridges. Assuming an ideal cross-section and considering a symmetrical...

Shear Stresses in Circularly Curved Bars
Mathematical formulations and solution techniques are presented for the stress analysis of circulary curved bars subjected to transverse forces in the plane of curvature. The formulation...

Cofferdam Construction: I-205 Columbia River Bridge
The foundations for I-205 North Channel crossing of the Columbia River are two types, large spread footings with seals bearing directly on dense conglomerate and double bell shaped footings...

The ABC'S (and Q) of Cold-Formed Steel Design
Cold-formed structural members are steel components that have been put into their cross-sectional shape by cold bending of flat sheets. Local compressive buckling must be carefully considered...

Utility Corridor Problems Caused by Mother Nature

An Overview of Corridor Sharing from Experience with Buried Pipelines

Structural Section Properties
A computer program is featured that is useful for determining section properties of geometric shapes used in a variety of applications, such as the use of built-up or nonstandard sections....

Standard Prestressed Concrete Beam Design
Equations are derived for the design for flexure of non-composite or composite prestressed concrete beams using standard cross-sectional shapes. Interaction diagrams showing the relationship...

Water Surface Profile for Horseshoe Tunnel
A method of calculating water surface profile for USBR standard horseshoe tunnel is developed. The method uses direct-integration process on energy principle. Equations describing geometry...

Pipeline River Crossings: A Design Method
A simple mathematical model based on tractive bed theory is outlined which can estimate the width and depth of a river channel as it scours in response to an assigned large discharge....

Wintertime Flow Distribution in River Channels
Analytical formulas are derived for predicting the transverse flow distribution in river channels based on the cross-sectional geometry and roughness coefficients. Both free surface flows...

Finite Element Analysis of Box Girders
A numerical method for the analysis of elastic thin-walled box girders is presented. The method is based on the separation of variables suggested by Vlasov and on the finite element method....

Nonlinear Static and Dynamic Deformations of Viscoelastic Cables
The rate equation method is used in this work to facilitate the analyses of finite deflection problems involving viscoelastic cables. In addition, within the confines of a structural theory,...

Continuous Steel I-Girders: Optimum Proportioning
A procedure based on elastic analysis is presented to find an economical proportioning of a continuous built up I-beam or girder which is symmetrical in cross section, has an unchanged...

Hysteretic Cycles of Axially Loaded Steel Members
Seventeen tube specimens and eight angle specimens were tested under repeated axial loading. Length of the specimens varied from 20 in. to 59 in. and their effective slenderness ratio...

Imperfectly Bonded Unsymmetric Laminated Beam
The elasticity solution of a simply supported imperfectly bonded laminated beam is presented. The results show that an imperfectly bonded three-layered beam deflects and is stressed less...

Water System Improvement Program in Eugene, Oregon
A water system radiating from a central area can stretch only so far. Adding more capacity requires proper planning, financial strength, and the art of meeting the system requirements...

Secondary Deflections and Lateral Stability of Beams
For members whose properties can be described in terms of one independent variable such as beams and columns, a new formulation of equations describing their elastic behavior is derived...

 

 

 

 

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