Abstract: A procedure is described that can be used to validate a knowledge‐based expert system. The method applies four qualitative measures that are specially designed for problems solved by multiple levels of experts whose authority ...

Abstract: A prototype knowledge‐based expert system for assisting engineers in selecting, locating, and designing construction and retrofit projects for traffic barriers, such as roadside barriers, median barriers, bridge rails, and ...

Abstract: This study investigates strain distribution in regions immediately adjacent to the transverse post‐tensioning bands in a new class of flat slab reinforced concrete bridges employing bidirectional post‐tensioning. While ...

Abstract: Time‐independent analyses of five of ten zones of a dummy reinforced concrete pipe at Cross Canyon are presented. All five zones are characterized by “positive projection,” four in a narrow, vertical‐sided trench with a ...

Abstract: Dynamic properties of a prototype soundwall composed of recycled plastic members are determined by experimental testing on a full-scale field structure. An impact hammer is used to impart transient excitation to individual ...

Abstract: A three-tenths-scale model of a posttensioned slab bridge is constructed in a laboratory and tested in the overload and ultimate load ranges. Dimensions of the slab are 16.9 × 5.33 × 0.23 m. In addition to uniformly ...

Abstract: This paper documents a study of the feasibility of using sign blanks constructed of reclaimed materials in roadside applications instead of conventional high-grade plywood and aluminum. Various types of recycled materials ...

Abstract: A method of frequency domain analysis in a laboratory is presented for simulating wind vibration affecting roadside transportation structures. The approach is intended to be complementary to or in lieu of a test in a ...

Abstract: Energy dissipation characteristics of rubber elements are discussed as a function of material, geometry, temperature, and grouping effects. Static and dynamic energy absorption of particular rubber compounds is quantified. ...

Abstract: An experimental program is reported in which the mechanical properties of high-damping natural rubber were measured. Rubber specimens were tested using a custom-designed mechanical apparatus that is equipped with a temperature ...