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A Reliability Study of Steel Bridge Connections with Bolts Designed with Threads Excluded but Installed with Threads Not Excluded

Brown, Lisa
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627664191587981

Abstract Details

2021, MS, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
This study analyzed steel bridge connections using a similar reliability method from a previous study focused on AISC design loads and bolt resistances in shear (Swanson et al., 2020b). It is possible for the bolts in a connection to be designed to resist shear across the shank of the bolt and instead to be installed with the smaller cross-sectional area of the threaded region in the shear plane. Smaller cross-sectional areas of the same material resist less load in shear. The discrepancy between design and installation for bolts in shear was found most likely to occur in situations when shorter bolts were used (Swanson et al., 2020a). This was for the shortest bolt of each bolt diameter produced and for diameters 1-3/8 in. and 1-1/2 in. up to a bolt length of 3-1/4 in. This study was conducted according to both the current and past editions of the AASHTO Bridge Specification. The study was split into two parts. The closed-form solution calculated reliability indices and probabilities of failure directly. The Monte Carlo simulations used computerized randomization to calculate probabilities of failure. These simulations attempted to account for the possible overstrength from the designer rounding up the calculated required number of bolts to an integer. The bolt data investigated in this study had nominal tensile strengths of 150 ksi and of 120 ksi. The 120 ksi group was split into a larger diameter group and a smaller diameter group. Of the three bolt groups, the small diameter 120 ksi group was the most reliable. Of the connection lengths considered, the compact connections were the most reliable. The values calculated from past AASHTO Editions were more reliable than the current edition results.
James Swanson, Ph.D. (Committee Chair)
Thomas Burns, Ph.D. (Committee Member)
Gian Andrea Rassati, Ph.D. (Committee Member)
69 p.
Civil Engineering
F3125; high-strength bolt; fastener; threads excluded; threads not excluded; shear

Recommended Citations

Citations

  • Brown, L. (2021). A Reliability Study of Steel Bridge Connections with Bolts Designed with Threads Excluded but Installed with Threads Not Excluded [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627664191587981

    APA Style (7th edition)

  • Brown, Lisa. A Reliability Study of Steel Bridge Connections with Bolts Designed with Threads Excluded but Installed with Threads Not Excluded. 2021. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627664191587981.

    MLA Style (8th edition)

  • Brown, Lisa. "A Reliability Study of Steel Bridge Connections with Bolts Designed with Threads Excluded but Installed with Threads Not Excluded." Master's thesis, University of Cincinnati, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627664191587981

    Chicago Manual of Style (17th edition)

ucin1627664191587981
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This open access ETD is published by University of Cincinnati and OhioLINK.