An experimental and numerical investigation of concrete pry-out failure after fire exposure: Group effects and failure mechanism

Tian，Kaipei1,2; Ožbolt，Joško2; Jebara，Khalil2; Chen，Jian Fei1,3

2022-09-01

10.1016/j.engstruct.2022.114571

ENGINEERING STRUCTURES   Impact Factor & Quartile

0141-0296

1873-7323

In the present study, the load-bearing capacity for concrete pry-out failure of the single stud anchor and multi-stud anchor groups after fire exposure is investigated experimentally and numerically. The main topic of the investigation is the influence of fire duration on the resistance and failure mode and the group effect on the load-bearing behaviour. The standard ISO 834 fire curve was employed. The numerical simulations were conducted using the thermo-mechanical model based on the microplane constitutive model for concrete, which was implemented into a 3D finite element (FE) code. The numerical model was first verified based on the performed experimental tests. Subsequently, the parametric study was performed in order to analyse the failure mechanism and the load distribution over the studs of the anchor group. It was shown that the employed numerical modelling technique can successfully predict the pry-out failure mode and the load-bearing behaviour of anchor groups after fire exposure. The results show that the group effect on the shear stiffness of anchors is strong at ambient temperature, but moderated after fire exposure. The group effect on the pry-out failure load of anchors, both before and after fire exposure, is significant. The evaluation of the load distribution at the interfaces between anchor and concrete contributes to a better understanding of the concrete pry-out failure mechanism before and after fire exposure.

Anchor group Finite element analysis Fire test Headed stud anchor Pry-out failure

SCI ; EI

English

First ; Corresponding

German Research Foundation [DFG]["HO 2575/3-1","OZ 10/14-2"] ; National Natural Science Foundation of China[52108281]

Engineering

Engineering, Civil

WOS:000840983900001

ELSEVIER SCI LTD

20222812356561

Anchors ; Bearing capacity ; Concretes ; Failure (mechanical) ; Failure modes ; Fire resistance ; Numerical models ; Shear flow ; Studs (fasteners) ; Studs (structural members)

Structural Members and Shapes:408.2 ; Concrete:412 ; Small Tools, Unpowered:605.2 ; Fluid Flow, General:631.1 ; Ship Equipment:671.2 ; Fires and Fire Protection:914.2 ; Mathematics:921 ; Numerical Methods:921.6

ENGINEERING

2-s2.0-85133819124

Scopus

1.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Institute of Construction Materials,University of Stuttgart,Stuttgart,Pfaffenwaldring 4,70569,Germany
3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China

Tian，Kaipei,Ožbolt，Joško,Jebara，Khalil,et al. An experimental and numerical investigation of concrete pry-out failure after fire exposure: Group effects and failure mechanism[J]. ENGINEERING STRUCTURES,2022,266.

Tian，Kaipei,Ožbolt，Joško,Jebara，Khalil,&Chen，Jian Fei.(2022).An experimental and numerical investigation of concrete pry-out failure after fire exposure: Group effects and failure mechanism.ENGINEERING STRUCTURES,266.

Tian，Kaipei,et al."An experimental and numerical investigation of concrete pry-out failure after fire exposure: Group effects and failure mechanism".ENGINEERING STRUCTURES 266(2022).