Effect of Dynamic Loads on the Lateral Strength of Nail Connections for theManufactured/Modular Housing Industry (Revised)

摘要

The study investigates the current methods used in the design of nailedconnections and finds that the design does not directly relate to the types of joints found in modular and manufactured housing in the sense that, it does not take into account the types of equipment used in current construction practices. Since a large number of joints are built with filler materials separating main wood members which undergo dynamic forces during their lifetime, the study makes an attempt to determine the effects of dynamic forces on nailed joints with two types of filler materials separating wood members, in two different humidity environments, and with different types of construction practices. A total of 240 joints were tested which demonstrated the following: dynamic forces help reduce the lateral stiffness of nailed joints; the majority of stiffness reduction in a nailed joint subjected to dynamic loads occurs in the first few cycles; after a joint undergoes dynamic loading; the level of moisture content of the wood members is not a factor in lateral stiffness or strength; and no differences in lateral strength are evident between coated, power-driven and uncoated, hand-driven nails.