Evaluation of vibration problems in existing office buildings

Abstract

Commercial office buildings are subject to many significant modifications over their design life. These modifications often include revisions to architectural features, changes in occupancy, and replacement of mechanical systems and are typically completed without formal consideration of vibration performance. These ongoing modifications impact the vibration level of service experienced by the occupants and can cause significant owner and tenant frustrations. Architectural renovations and changes in tenant build out can significantly alter the nature of walking excitation and system damping. The detailing of tenant build out partitions has a big impact not only on the system damping but also the susceptibility of vibration induced noise within the partition systems. Changes in occupancy or intensity of use can also impact user expectations and comfort within the built environment. The degradation of existing building mechanical systems or the replacement of these systems can also greatly impact the vibration level of service within an existing structure. These impacts often catch building owners and facility managers off guard due to a lack of knowledge regarding vibration performance. The objective of this paper is to explore the process of vibration source detection, system evaluation, and rehabilitation through recent case studies. These case studies will explore the onsite evaluation procedure used including client interviews, testing, and evaluation of excitation sources as well as considerations used for detailing of remedial measures.