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Our consultants regularly engage in research activities related to our normal client services. This archive includes the majority of the published technical papers, presentations, and other publications related to this research.

Construction vibration monitoring for sensitive facilities

Building expansion and densely developed campuses often require construction adjacent to highly vibration sensitive facilities such as advanced technology manufacturing, laboratories, and hospitals. The vibration generated by the construction work poses a considerable risk to the sensitive processes in these facilities, which typically need to continue operations during construction. In these scenarios it is often […]...
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Dynamic Stiffness and Subgrade Modulus of a Slab-on-Ground

“Conventional wisdom” amongst users of cutting-edge electron microscopes and other sensitive research instruments is that their instrument will perform better if supported on a “thick” concrete slab-on-ground.  Typically, their choice of a slab thickness is based on what worked well for someone else, without any thought given to an analytical justification.  The paper presents the […]...
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Effects of frequency and depth on attenuation of ambient ground vibration.

This article discusses the effects of below-grade building placement on vibrations measured prior to design and construction. Typically, site vibration studies are conducted on undeveloped locations (grass fields, parking lots, etc.) to assess the ambient vibration conditions for a potential building site. These results, though very important, do not necessarily represent the final ambient vibration […]...
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Voids Beneath Slabs-on-Ground: Using the impulse response test to verify adequate slab support

Introduction A concrete slab-on-ground is one of the most common of all floor types.  Slabs-on-ground are popular for many applications, especially in research facilities, where they usually provide the highest-quality vibration environment.  This is because they are stiff and uniformly supported, such that they do not exhibit the resonance characteristics of a suspended slab. As […]...
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