Upon having the construction of a new church near completion, walking induced vibration was perceived on a long span balcony. DEICON conducted on-site measurements and identified the first two natural frequencies of the balcony. In addition, the participating mass and the damping ratio of mode 1 of the balcony were evaluated. DEICON designed and fabricated […]
Read MoreDEICON designed and fabricated the components for vibration isolation of a massive 110,000 lb, industrial process equipment, subject to random perturbation. The isolators used in the random vibration isolation system are made up of low-stiffness coil springs paired with viscous dampers. Motion control schemes were incorporated into the isolation system to manage the lateral excursion […]
Read MoreHunter’s Point South Park is a breath-taking waterfront park located on the edge of the East River, in Western Queens, NY. The focal point of the park is Hunter’s Point South overlook, a beautiful cantilevered platform that offers unobstructed views of the New York skyline. The Overlook’s rather low fundamental frequency (3.5 Hz) combined with […]
Read MoreGrant Street Pier, the focal point for “The Waterfront” development in Vancouver, WA is an attractive, triangular, post-tensioned concrete deck overhanging the water by 90 feet providing an expansive view of Columbia River. A cable system and 80-foot-tall mast support the deck. Since the pier is intended for visitors walking on it as well as […]
Read MoreExcessive vibration of a long span balcony (mezzanine) in an upscale residence was addressed by using a tuned mass damper tuned to the natural frequency of the first structural mode of the balcony. The TMD was sized to have the nominal active mass of 450 Kg. The depth and height of the TMD were chosen […]
Read MoreThe irregular shape of three large, 1200 square feet, cantilevered balconies in a high-profile performing arts center resulted in areas at the balcony tip and edge susceptible to potentially annoying levels of vibration. To mitigate this effect, the building designers added tuned mass dampers (TMDs) to the underside of each of the three balconies. Following […]
Read MoreThe focal point of the City of Vancouver, Washington’s new development along the Columbia River is a concrete cantilever pier with an iconic and attractive form. The pier’s triangular, post-tensioned concrete deck overhangs the water by 90 feet and provides an expansive view of the river. A cable system and 80-foot-tall mast support the deck. […]
Read MoreThe long span balcony (mezzanine) in an up-scale large custom-built, single-family residence, overlooking the large open area of floor below had an unacceptable vibratory attribute. The balcony is supported by a long, wide flange (W21) steel beam that supports approximately 600 square feet of tributary floor area. As anticipated and evident from the measured data, […]
Read More