Historic Murrin No. 1 substation is a reinforced concrete shearwall building constructed in 1946 in downtown Vancouver, British Columbia, Canada. The building is characterized by significant horizontal discontinuities (very large openings in floor diaphragms due to two large two-story high areas), and vertical irregularities (discontinuous and/or offset shear walls). Another characteristic of this structure is the presence of heavy equipments and thick concrete fills at different levels and lightly reinforced slender concrete walls.
ESE was selected by B.C. Hydro as the prime consultant to evaluate the structure and contents for different level earthquakes, assess the probability of its failure for each earthquake, and to design for seismic retrofit of the building and its contents/equipment for the selected level of design earthquake with a return period of 475 years. Failure of this essential facility is defined as complete or partial collapse in such a way that exit or re-entry of occupants becomes impossible and/or operation of the substation in supplying power to the city of Vancouver becomes interrupted after an earthquake.