Performance-Based Seismic Design of RC Buildings: State of Practice (ACI Fall 2017 Convention, Anaheim, CA) This presentation summarizes the benefits and challenges of implementing performance-based seismic design (PBSD) for the concrete buildings of the Lower Sproul Plaza Redevelopment Project in one of the busiest areas of UC Berkeley campus. The project included new construction of Eshleman Hall and the additions to Martin Luther King (MLK) Hall, and the seismic retrofit of the existing MLK Hall as a result of the expansion. The peer-reviewed PBSD implemented three-dimensional nonlinear response history analyses at two levels of seismic hazard. The analytical simulations using pairs of near-fault ground motions, scaled to match the site specific spectrum, were intended to establish the expected seismic behavior of the buildings under rare and frequent earthquakesThis presentation summarizes the benefits and challenges of implementing performance-based seismic design (PBSD) for the concrete buildings of the Lower Sproul Plaza Redevelopment Project in one of the busiest areas of UC Berkeley campus. The project included new construction of Eshleman Hall and the additions to Martin Luther King (MLK) Hall, and the seismic retrofit of the existing MLK Hall as a result of the expansion. The peer-reviewed PBSD implemented three-dimensional nonlinear response history analyses at two levels of seismic hazard. The analytical simulations using pairs of near-fault ground motions, scaled to match the site specific spectrum, were intended to establish the expected seismic behavior of the buildings under rare and frequent earthquakes.

Controlling Fresh Properties of SCC for Adequate Placement (238) (ACI Spring 2018 Convention, Salt Lake City, UT) Once a Self-Consolidating Concrete mixture is developed the recipe is created and certain performance criteria are expected on site. Some variability in fresh properties can be expected, but the goal is to minimize these variations in order to facilitate construction. When a change occurs between batches how does the producer respond? In some instances, allowable adjustments to material proportions and/or admixture dosages must be made. Who decides which adjustments to make? This presentation discusses a process by which a concrete producer can establish protocol for making adjustments in order to establish greater consistency within a project where SCC is used.