Title: Seismic Effect of Reinforcement around Circular Opening in Reinforced Concrete Beam (Open Source)

Author(s): Koshiro Nishimura and Sujan Pradhan

Publication: Structural Journal

Volume: 121

Issue: 4

Appears on pages(s): 237-248

Keywords: crack control; opening; reinforced concrete (RC) beam; shear capacity; upper-bound theorem

DOI: 10.14359/51740576

Date: 7/1/2024

Abstract:
In this study, five reinforced concrete (RC) beam specimens with transverse web openings and one specimen without openings were prepared. Diagonal steel bars were arranged around the web openings in the beam specimens so as not to fail at the section with the openings. The specimens were subjected to static reversed-cyclic shear loading of double curvature, and those specimens failed in shear at a different part than the section with the web openings. This paper provides a simple model of the relationship between stress in the diagonal reinforcement around the openings and the applied shear load considering the shrinkage of concrete. Moreover, an evaluation method of the ultimate shear capacity of the beam using the upper-bound solution of the limit analysis was also provided. These models showed good agreement with the test results. The study contributes to the crack control and safety of RC beams with openings.