ClientHOK Architects/Saint Louis Art Museum
BackgroundThe Saint Louis Art Museum campus is composed of the original Cass Gilbert Building, a predominantly masonry structure constructed for the World's Fair in 1904, and surrounding additions constructed between 1957 and 1985. In 2007, a large museum expansion, designed by London architect David Chipperfield in collaboration with HOK Architects, broke ground to add approximately 95,000 square feet of new building space. Plans for the new four-level East Building, to be constructed next to the Cass Gilbert building, included three below-grade levels primarily for parking and one above-grade level for galleries. The project also included a below-grade circulation corridor and new loading dock.
SolutionThe primary objectives were to measure by field testing the vibration attenuation characteristics of the site and buildings, to estimate from the test data the degree to which the planned construction activities would transmit vibrations into the buildings, to assist the museum with preparations to safeguard the buildings and their contents, and to develop a project-specific vibration control specification to be incorporated into the contract documents for the expansion.
At the start of construction, WJE conducted vibration trials to verify vibration levels caused by actual equipment. During construction, WJE monitored vibrations using as many as twenty-two remotely accessed seismographs, which collected data continuously and sent immediate notifications of any above-limit vibration events.
At the architect's request, WJE provided several recommended specification sections, including air barrier quality control, airtightness specifications, enclosure commissioning, and under-floor air distribution system airtightness and testing. The various interfaces of old and new construction also necessitated close attention to the performance of the building enclosure. Thus, during construction, WJE was asked to provide services to observe the continuity of the air barrier system joints, junctures, and transitions between various materials and assemblies.