SEISMIC AND ENERGY RETROFIT OF MULTIFAMILY LIGHT-FRAME TIMBER RESIDENTIAL BUILDINGS USING MASS PLY PANEL (MPP) WALL FAÇADE SYSTEM

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The most common type of construction in the US for single and multifamily housing is known as Light-Wood-Frame (LWF).This system has been widely used for decades, following prescriptive design rules and usually without an engineered-based analysis.Due to the evolution of knowledge on the seismic hazard in the Pacific Northwest, retrofitting these structures built before the 1990s has become a necessity.In addition, these buildings also lack the energy efficiency required to reduce our global carbon footprint.This paper presents a novel façade retrofit solution consisting of prefabricated mass ply panels (MPP) that can be rapidly applied on-site over existing building cladding to upgrade older LWF one-to three-story buildings.The structural design of an existing prototype two-story LWF building in Portland, OR is presented.Custom steel connections resist design forces following the Equivalent Lateral Force (ELF) method from ASCE 7-16.Nonlinear displacement validation is performed using analytical models (AM) and finite element models (FEM), obtaining lateral drifts of 0.50% for the design earthquake (DE) reducing the expected damage in the building.Over-strength factors are calculated, considering the contribution of existing LWF walls and steel connections.A follow-up experimental setup is described for future validation of the initial assumptions.

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