Wrought Iron Bridge Designs

What Hath We Wrought?

Variability of the Mechanical Properties of Wrought Iron from Historic American Truss Bridges

The mechanical properties of wrought iron from multiple elements of six late 19th-century truss bridges is evaluated by a program of destructive and nondestructive testing, including hardness testing and tension tests to evaluate the yield stress (Fy), tensile strength (Fu), and ductility of the material. The yield stress and tensile strengths are found to be in accordance with those published ...

Travel bans will increase the damage wrought by ebola.

Cases of Ebola that have turned up in Dallas and New York City have prompted calls for a travel ban to prohibit travelers from Sierra Leone, Liberia, and Guinea from entering the US during the ongoing Ebola outbreak. But travel bans have not worked in past epidemics and will not stop Ebola from spreading. Banning travel would slow the movement of people and goods to those countries, harm the in...

Gate-Sizing-Based Single Vdd Test for Bridge Defects in Multivoltage Designs

The use of multiple voltage settings for dynamic power management is an effective design technique. Recent research has shown that testing for resistive bridging faults in such designs requires more than one voltage setting for 100% fault coverage; however switching between several supply voltage settings has a detrimental impact on the overall cost of test. This paper proposes an effective gat...

Benchmark Structural Control Problem for a Seismically Excited Highway Bridge Part II: Sample Control Designs

This paper presents sample control system designs for the three-dimensional benchmark structural control problem for seismically excited highway bridge. Three types of sample control systems, namely nonlinear viscous dampers, ideal hydraulic actuators and magnetorheological (MR) fluid dampers, are designed and presented for comparison by participants in the study. For each of the three sample c...