Jeremiah O’Neill, H + O Structural Engineering
Using the maximum allowable building heights for mid-rise construction can result in structures with five stories of wood over two stories of concrete; however, there are a number of unique design considerations for podium structures of this height. For wood superstructures, this includes gravity and lateral loads far greater than their low-rise counterparts, as well as fire-retardant treatment requirements for exterior walls. Meanwhile, concrete podium levels must be designed to support the wood superstructure, including large anchorage forces from the ends of the wood shear walls, while maintaining a thin profile so as not to exceed overall building height limits. This presentation will address these unique design considerations, particularly as they relate to the lateral design of five-story wood structures over podiums.