Medical Research Building IV
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 reinforcement in the new slabs utilized the VSLAB+® bonded slab system to easily accommodate future modifications. STRUCTURAL TECHNOLOGIES was selected for this challenging project as the post-tensioning supplier because of the company’s diverse range of products, engineering support and installation expertise.
One of the structural features of the medical building is the unique post-tensioned concrete trusses that were built 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 and reinforced with 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.
The second phase presented unique challenges and included spanning and encapsulating the existing Langford Auditorium without closing it or adding any supports within it. A unique post-tensioned concrete truss design was developed to span 132 feet over the auditorium and support nine floors above with minimal deflection.