A new analytical model for sheathing-to-framing connections in wood shear walls and diaphragms is discussed in this paper. The model represents sheathing-to-framing connections using an oriented pair of nonlinear springs. Unlike previous models, the new analytical model is suitable for both monotonic and cyclic analyses and does not need to be scaled or adjusted. Furthermore, the analytical model may be implemented in a general purpose finite element program, such as ABAQUS, or in a specialized structural analysis program, such as CASHEW. To illustrate, the responses of a 4.88ϫ 14.6 m plywood diaphragm and a 2.44ϫ 2.44 m oriented strand board shear wall are predicted using the new analytical model.

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This paper explores the inelastic behavior and the risk of collapse of buildings designed for wind loads. The approach used is similar to the prevailing method utilized for seismic loads (FEMA P-695). Single-degree-of-freedom models are used to represent the hysteretic behavior of the actual main wind-force resisting systems, including in-cycle degradation. An ensemble of wind load records from boundarylayer wind tunnel tests are applied to capture both along-wind and cross-wind effects. Wind loads are then scaled (intensified corresponding to increasing hazard levels) using an incremental dynamic analysis (IDA) approach until lateral instability and collapse occurs. The risk of collapse is quantified by incorporating epistemic uncertainty and integrating collapse fragility with ASCE 7-10 wind speed data.

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