Graduate Thesis Or Dissertation
 

Non-destructive determination of yield stress for in-situ gusset plates

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/b8515r28n

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  • Failure of a gusset plate that caused the I-35W Bridge collapse in Minneapolis, MN resulted in mandated rating of connections by the Federal Highway Administration (FHWA). Rating connections requires material properties as an input. The material properties are generally reported on the available detailed drawings for bridges. However, some bridges do not have documented materials or it is uncertain if the as-built properties are those reported in the design documents. To ensure ratings that adequately reflect the in-situ connections, the material properties must be obtained. Unfortunately, at present there are no recognized, non-destructive testing methods available to establish the yield stress of in-service steel gusset plates. To address this need, a prototype testing device was developed to determine the yield stress of in-service connection plates. The device applies an out of plane load to the free edge of a gusset plate and simultaneously, the load applied by the device and plate deflection under the load point are measured. These measurements are then correlated to the yield stress which is determined based on calibrated finite element models for various materials and thicknesses. The non-destructive testing device can serve three major functions for connection evaluations. It will 1) allow bridge owners to establish the material properties for bridges that do not have documentation of the materials used in construction, 2) allow rating engineers to determine if the yield stress is above the minimum required for the plate to achieve a specific rating, or 3) enable rating engineers to use the actual yield stress of the plate to extract the most capacity from the connection. The research outcome allows bridge owners to effectively and non-destructively collect as-built yield stress of gusset plate connections thereby enabling connection capacity to be established with greater certainty.
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