Lifelines and infrastructure systems are among the most critical operational components of an urban environment to ensure a minimum level post-earthquake economic societal functionality following major seismic events. The overall performance lifeline after September 19, 2017 Mw 7.1 Central Mexico earthquake was generally positive. extensive impact observed on fresh water supply network within C...

Current maintenance practices consume significant time, cost, and manpower. Thus, a new technique for is required. Construction information technologies, including building modeling (BIM), have recently been applied to the field carry out systematic productive planning, design, construction, maintenance. Although BIM increasingly being structures, its application existing structures has limited...

Abstract Encouragement of cycling is an effective way to reduce energy consumption by traffic. Cycling lanes will, the greatest extent practicable, be built close currently used traffic roads in order establish new, swift that require little space. Building near railroads appears acceptable for latter, preferably cantilevered structures atop existing bridges. In event this not acceptable, separ...

three unconventional details for plastic hinges of bridge columns subjected to seismic loads were developed, designed, and implemented in a large-scale, four-span reinforced concrete bridge. shape memory alloys (sma), special engineered cementitious composites (ecc), elastomeric pads embedded into columns, and post-tensioning were used in three different piers. the bridge model was subjected to...

This paper examines the historical impact of railroads on the American economy. Expansion of the railroad network and decreased trade costs may affect all counties directly or indirectly, an econometric challenge in many empirical settings. However, the total impact on each county can be summarized by changes in that county’s “market access,” a reduced-form expression derived from general equil...

We developed a new semi-analytical source zone depletion model (SZDM) for multicomponent light nonaqueous phase liquids (LNAPLs) and incorporated this into an existing screening model for estimating cleanup times for chemical spills from railroad tank cars that previously considered only single-component LNAPLs. Results from the SZDM compare favorably to those from a three-dimensional numerical...