This research successfully applies the hot spot stress approach to steel highway bridges for fatigue evaluation of welded details subject to in-plane stress or out-of-plane distortion. The existing nominal stress approach addresses distortion only qualitatively and is unable to deal with novel...
Full-depth precast panel systems are one of the categories of accelerated bridge construction. This type of construction has many advantages in comparison with other methods of construction. Per AASHTO LRFD Specifications, the spacing of shear connectors is limited to 4 ft for concrete girders,...
Abstract of DissertationEvaluation Of Options To Extend Span Range Of Precast Prestressed Concrete Bridge Girders During Preliminary DesignDesign of highway bridges passes through the following two phases: 1- Preliminary design where the design engineer decides on the major artifact type and...
This dissertation studies the nucleation mechanisms of ice, clathrate hydrate and silicon clathrate which all belong to tetrahedral materials and carry significant importance to modern society. Because of the stochastic nature and the ultra-fine scale of nucleation, the mechanisms through which...
This numerical research studies the effect of considering total body out-of-flatness pattern on design strength of typical steel bridge girders constructed in the United States with the purpose of modifying the current American Welding Society (AWS) out-of-flatness allowances accepted by American...
Liquefaction-induced lateral spreading is the permanent lateral deformations developed in gently sloping ground due to a seismic event. The magnitude of the lateral spreading could range from a few millimeters to several meters causing damages to civil infrastructure including bridges, buildings,...
Land surface heat and evaporative fluxes exchanged between the land surface and the atmospheric boundary layer play an important role in the climate system. In situ measurements of these fluxes are expensive and available only over a limited number of field experiment sites. At present, the only...