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Localized Collapse of Shells of Revolution
A local-global methodology is presented to treat the problems of localized collapse of shells of revolution. The strategy consists of employing two dimensional general shell elements in...

Methodology for Developing an Engineering Solution for Web Crippling
This paper describes the methodology used to develop an engineering solution for web crippling of aluminum trapezoidal sections. The development has two steps. The functional form for...

A Second Order Analysis Technique for Nonprismatic Bridge Piers
An approximate second order method is presented for the analysis and design of cantilever compression members. Prismatic members with nonconstant reinforcement, and nonprismatic members...

Computational Failure Analysis of Reinforced Concrete Plate Structures
The paper summarizes our recent effort in developing a suitable finite element code for the failure prediction of reinforced concrete structures. The basis of the development is a plasticity...

Analysis of Delamination Onset and Growth in Curved Laminates
This paper details an analysis to characterize delamination onset and growth from a matrix crack in a curved composite laminate. Finite element analysis was used to determine values of...

Analysis of a CMC Compact Tension Specimen
A cohesive force model is applied to study the stability of fiber failure in a ceramic matrix composite compact tension specimen. By controlling the length of the bridged crack results...

Design Considerations for Large-Scale Filament-Wound Composite Structures
An experimental investigation was conducted to quantify scaling effects in filament-wound composite structures. These preliminary results support the notion that an increase in thickness...

Damage Tolerance of Composites
The damage tolerance issue in composites is driven by the requirement for and implementation of a structural integrity criterion for a structural system. A key element in the design philosophy...

Failure Modes and Toughening Mechanisms in CMC
The paper reports results from stable flexural and tension tests conducted at room temperature on plain matrix and ceramic matrix composite (CMC) specimens. The flexural tests were conducted...

Observations of Microcracking and Pore Collapse in Limestone Using Liquid Metal Porosimetry
A technique has been developed to preserve and observe the microstructure of rock or other porous material, as they exist under stresses, using liquid metal porosimetry. Cylindrical specimens...

Bond Strength of Reinforcing Bars in SIFCON
This paper presents a brief summary of an ongoing investigation on the bond characteristics of deformed reinforcing bars embedded in a SIFCON matrix. A significant increase in bond strength,...

Simulation of Failure Processes in Cementitious Particle Composites
Progressive failure analysis in cementitious particle composites such as concrete requires a realistic description of the topology of the composite structure and the interaction of the...

On Statistical Micromechanical Process Damage Models for Brittle Solids with Interacting Microcracks
Two-dimensional micromechanical damage models with strongly interacting microcracks are presented to investigate the overall nonlinear mechanical responses of microcrack-weakened brittle...

Micro-Damage Process Model for Polycrystalline Ice
This paper presents a micro-damage process model for freshwater polycrystalline ice deforming at the high end of the ductile-to-brittle transitional domain of strain rated. Damage is attributed...

Testing the Limits
More than 100,000 bridges in the U.S. are considered structurally deficient and in need of posted load limits or repair. As the number continues to mount, engineers search for a better...

Inspection Goes High Tech
Many believe that rehabilitation of the existing infrastructure�not net construction�will dominate the 1990s. Therefore, accurate condition assessment is crucial, since public works agencies...

Cables Not in Trouble
Cable-stayed bridges in the U.S. are not, contrary to reports widely disseminated in the press several years ago, about to fail from corrosion. The design, in which primary cables support...

Pipeline Rehab: Underground Options
While simply digging up old pipes and replacing them is sometimes still best, other alternatives can give long life while easing the strain on the community. Trenchless methods for on-line...

Determination of the Deformation Characteristics of a Jet-Grouted Shallow Tunnel in Alluvial Deposits by Means of In-Situ Measurements and Back Analysis
The deformation characteristics of a jet-grouted shallow tunnel in alluvial deposits are investigated. An intensive in-situ measuring program accompanied each of the various excavation...

Methodology for Optimizing Rock Slope Preventative Maintenance Programs
Rock slopes along transportation routes can fail in several different modes, with various types and magnitudes of consequences. The 'risks' associated with such...

 

 

 

 

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