Effect of shear reinforcement and external strengthening with strain-hardening cement-based composites (SHCC) on the impact resistance of reinforced concrete beams

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

Abstract

The paper presents a series of impact experiments performed on reinforced concrete (RC) beams with and without stirrups and additionally without and with lateral strengthening layers made of two types of strain-hardening cement-based composites (SHCC). The impact tests were performed in an advanced drop tower facility with accelerated steel projectiles. Four impact velocities were applied, ranging from 17 m/s to 30 m/s, corresponding to kinetic energies from 2.1 kJ to 6.4 kJ. The difference among the 20 mm-thick, normal-strength SHCC layers with 2 % fiber volume content consisted in the type of reinforcing fiber: polyvinyl alcohol (PVA) or ultra-high molecular weight polyethylene (UHMWPE). The RC beams with no shear reinforcement yielded shear failure with displaced punching cones under all impact velocities. The stirrups notably increased their impact resistance and damage extent, allowing multiple impact loads without structural collapse. The lateral strengthening layers of SHCC substantially increased the load-bearing capacity, diminished the damage extent, and increased the damage tolerance under repeated impact events of the RC beams both with and without stirrups, proving to be a promising strengthening solution for existing structures prone to severe mechanical loading.

Details

OriginalspracheEnglisch
Aufsatznummer105371
Seitenumfang16
FachzeitschriftCement and Concrete Composites
Jahrgang145
PublikationsstatusVeröffentlicht - Jan. 2024
Peer-Review-StatusJa

Externe IDs

ORCID /0000-0002-1825-1946/work/147672133
ORCID /0000-0002-8976-6680/work/147672807
ORCID /0000-0003-2440-5670/work/147672816
ORCID /0000-0002-1596-7164/work/147674906
Scopus 85178035736

Schlagworte

Schlagwörter

  • Impact, SHCC, Reinforced concrete beams, Shear strengthening, Stirrups