In effort to enlarge its medical research facilities, Vanderbilt University performed a 124,000 square foot vertical expansion of the Light Hall laboratory building and constructed a connecting 275,000 square foot tower over the 1,200-seat Langford Auditorium. The primary reinforcing in the new slabs utilized VSL's VSLAB+ bonded slab system to easily accommodate future slab modifications.

One of the structural features of the medical building is the unique post-tensioned concrete trusses that were built to span 132 feet over the existing auditorium without closing it or adding any supports within.  The four trusses on the transfer level support nine floors above with one-inch of allowable deflection.  The trusses were reinforced with VSL bonded multistrand, threaded bar and unbonded monostrand systems. As each floor was added, the trusses were stage stressed to control member stresses and to minimize camber effects on subsequent elevated concrete slabs. 

VSL was selected as the post-tensioning supplier because its diverse range of products, engineering supporting and installation expertise for this challenging project.