UCB Hildebrand Hall Seismic Retrofit

Hildebrand Hall, built in 1966, was named after Joel Hildebrand, longtime chemistry professor and dean, and the inventor of Chem 1A's fabled Big Game Titration. The building houses graduate research laboratories, undergraduate teaching labs, and the Chemistry Library.

The seismic retrofit of the 90,600 sfof  post-tensioned concrete building with suspended cantilevered slabs took place in a sensitive and operational part of campus. It included 2' thick shear walls rising 78' through the interior of the building, a unique 18' deep shoring and excavation using a combination of concrete underpinnings and conventional shoring through pea gravel then rock. Over 3,000' of collector angles and plates, vertical tubes from roof level to 3rd and 2nd levels were used to relieve the stress from the curtain walls suspended 15' on cantilevered post-tensioned slabs. It also included the installation of state of the art bonded bracing system from Mitsui USA and Nippon Steel, Japan. Overaa created new stair openings in a button-head-post-tension slab. To avoid cutting post tension cables, we employed Ground Penetrating Radar (GPR) at up to 8" slabs and X-rayed at the thicker slab conditions.