Browsing by Author "Smith, Ian"

Now showing 1 - 4 of 4
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    A review of the current design code provisions for nailed joints
    (University of New Brunswick, 1999) Craft, Steven T.; Smith, Ian; Smith, I.
    A series of experiments were carried out in order to predict material properties and joint capacities. The capacity of nails loaded with withdrawal with various penetrations were tested. The capacity of laterally loaded double shear and single shear joints were also tested. The 5th percentile adjusted capacities are compared to those in the design code CSA Standard 086.1-94. The mean capacities of laterally loaded joints are compared to predictions from the "European Yield Model" (EYM). The design code values and the EYM predictions were close for the double shear joints. The design code overestimates the joint capacities for single shear joints, while the EYM predictions were quite close to the mean tested values. The withdrawal tests show that the equation used to calibrate CSA Standard 086.1-94 overestimates the adjusted 5th percentile values by a substantial amount. This comparison was based on the equation used to calibrate CSA Standard 086.1-94. The results show a small increase in withdrawal resistance for multiple nail withdrawal at the 5th percentile level. Recommendations are made regarding revision of provisions in the design code. Key words: nail embedment,
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    A structural analysis of timber bridges on the UNB woodlots
    (University of New Brunswick, 1996) Mahoney, Jeff; Smith, Ian; Smith, I.
    Timber bridges have been used extensively on forest access roads throughout the Maritime provinces for many years. The majority of these bridges have been constructed without prior design guidelines. Most forest planners utilize existing designs that have worked successfully in other areas. This method was employed by the staff of the Maritime Forest Ranger School and resulted in some uncertainty as to the structural abilities of their bridges. A structural analysis of the eight timber was performed using the methods outlined in the Ontario Highway Bridge Design Code and the results are presented and discussed.
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    Augmented biofeedback for partial weight-bearing learning
    (University of New Brunswick, 2019) Smith, Ian; Bateman, Scott; Scheme, Erik
    Assistive devices, including canes and crutches, are used in partial weight-bearing (PWB)–offloading weight from limbs weakened by disease or injury to promote recovery and prevent reinjury. While it is important to accurately offload weight to target loads prescribed by healthcare providers, current training methods result in poor compliance. It is currently unknown how to most effectively provide feedback during training to allow users accurate execution of the skill later on. In this work, three studies were conducted to investigate the effects of feedback modality, delay, and resolution on both regulation and learning of PWB while stationary and during gait. Results indicate that concurrent feedback is best suited for continuous skill regulation whereas retrospective feedback is preferable for training PWB, and that task-specific training is critical for compliance. This work presents design guidelines for improved clinical PWB training methods and highlights the importance of researching retrospective motor learning methods.
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    Continuity connection for cross laminated timber (CLT) floor diaphragms
    (University of New Brunswick, 2015) Sheikhtabaghi, Masoud; Smith, Ian
    Cross Laminated Timber (CLT) is a lightweight construction material with a strength and stiffness comparable to Reinforced Concrete (RC). A crucial aspect of fully realizing the potential of CLT as a structural material is ability to interconnect it to similar and dissimilar materials. A study of connections was made through in-plane shear and tension tests on half-lapped and single-spline connections that make edge-to-edge jointing between CLT panels using screws. A novel aspect of the study is investigation of how placing washers under screw heads alters stiffness and strengths of connections. Subsidiary axial load tests on screws assisted explanation of the shear and tension test results. Conclusions include the importance of accounting for large displacement effects on how screws transfer forces across joint-planes, and need to improve current generation connection design methods so that they account for effects of eccentricities that result from construction arrangement and detailing decision.