Posts Tagged with Building & Structure

Vibration Control of a Grand Ballroom Floor System Using Tuned Mass Dampers

Floor vibration of a grand ballroom subject to crowd loading is mitigated using tuned mass dampers along with stiffening.

Vibration Control of Long Span Balcony in a Church Using Tuned Mass Dampers

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 […]

Vibration Control of Long Span Balcony in a Church Using Two Tuned Mass Dampers

Vibration Control of an Office Building Floor System Using Tuned Mass Dampers

Walking induced vibration of composite floor system of an office building was controlled at 4 bays, using 8 x 1500 lb tuned mass dampers (TMDs). The measured natural frequencies of the floor system were used in tuning the TMDs targeting the first vibration mode of two bays and first two vibration modes of the other […]

Monumental Staircase Vibration Abatement Using a Tuned Mass Damper-3

To address the vibration of a monumental staircase in an office building, the structural engineer of the project incorporated a 500 lb tuned mass damper (TMD) into the design. DEICON designed, fabricated the TMD to be installed underneath the landing Figure 1 shows the tuned mass damper. The dynamic attributes of the monumental staircase, namely […]

Vibration Control of Operating Rooms’ Floor System in a Medical Center via Stiffening and Tuned Damping

Part of an existing building was converted to a medical center with a number of operating rooms. Vibration Measurement of the bare floor system (without any fit-out) pointed to the first natural frequencies of around 6 Hz for various bays. Floor Vibration Limits of Operating Rooms: ISO standard suggests that vibrations in operating rooms not […]

Monumental Staircase Vibration Abatement Using a Tuned Mass Damper-2

To lower the vibration level of a monumental staircase, one 500 lb tuned mass damper (TMD) was designed, fabricated, and appended to the structure. The natural frequency of the staircase was measured and used for tuning the TMD. Figure 1 shows the landing of the staircase with two of the measurement locations highlighted. Monumental aesthetically […]

Vibration Abatement of a Monumental Staircase Using a Tuned Mass Damper

Following the evaluation of the dynamic attributes of a monumental staircase (in an upscale financial office building), one 500 lb tuned mass damper (TMD) was designed, fabricated, and shipped to the job site. Two views of the nearly completed staircase are shown in Figure 1. Monumental, aesthetically pleasing staircases are getting incorporated more and more […]

Vibration Control of an Overlook Using Tuned Mass Dampers

Hunter’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 […]

Vibration Control of a Concrete, Cantilever Pier Using Tuned Mass Dampers

Grant 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 […]

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