Title: Seismic Performance of Gravity Load Designed Beam-Column Joints with Strain Hardened Cementitious Composite

Author(s): B.S. Sindu and Saptarshi Sasmal

Publication: Structural Journal

Volume:

Issue:

Appears on pages(s):

Keywords: beam-column joint; energy dissipation; hysteresis behavior; seismic upgradation; strain hardened cementitious composite

DOI: 10.14359/51740484

Date: 1/24/2024

Abstract:
Beam-column joints are crucial components for ensuring the safety of structures during earthquakes. Various standards/codes (Eurocode 8, ACI 352R-02, IS 13920-1993) prescribe special reinforcement detailing at the joint region to improve seismic performance. Though extremely important, execution of the same is challenging due to heavy reinforcement congestion. In this regard, an attempt has been made in this study to develop a strain-hardened, high-performance cementitious composite (SHCC) with improved tension-related performance, for seismic-resistant beam-column joints which can potentially reduce the reinforcement demand. The efficacy of SHCC in improving the Gravity Load Designed (GLD) beam-column (BC) joint without any additional reinforcements required for ductile detailing is investigated. Full-scale BC joint specimens were developed and subjected to reverse cyclic loading and the critical seismic performance such as hysteresis behavior, damage pattern, energy dissipation, shear deformation, and strength/stiffness degradation were evaluated and compared with GLD specimens with normal concrete. It is observed that the GLD specimens with SHCC at the joint region showed remarkable performance. Without any additional confinement in the joint region, energy dissipation is doubled (100%) and shear deformation is only 40% of the GLD under the same drift demand. The findings of this study will help in developing seismic-resistant beam-column joints with minimal reinforcements.