Assessment of deep beams with inadequate web reinforcement using strut-and-tie models. (1st September 2020)

• Record Type: Journal Article
• Authors: Zaborac, Jarrod; Choi, Jongkwon; Bayrak, Oguzhan
• Is Part Of: Engineering structures. Volume 218(2020)
• Publication Date: 2020-09-01
• Subjects: Deep beam -- strut-and-tie model (STM) -- Shear -- Assessment -- Bent cap -- Concrete efficiency factors; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.110832
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Reinforcement crossing a crack plays significant role in STM efficiency. Max. nodal efficiency factors can be used for structures without min. reinforcement. STM can be used as a practical tool for the assessment of existing structures. Abstract: The objective of the study summarized in this paper was to evaluate the strut-and-tie design provisions of the 2017 AASHTO LRFD Bridge Design Specifications as a capacity assessment tool for structures with non-code-compliant crack control reinforcement detailing, that is, members which do not contain the minimum volume of reinforcement and/or violate the maximum allowable spacing. A database of 905 deep beam tests was filtered down to 253 tests to complete this evaluation. Six different methods for selecting concrete efficiency factors were investigated using the database. Furthermore, a case study of an approximately 60-year-old bent cap was completed. Ultimately, it was found that, with few adjustments, the current provisions could be used to estimate the capacity of structures with out-of-date reinforcement detailing practices safely and effectively.