Key Engineering Materials
Vols. 336-338
Vols. 336-338
Key Engineering Materials
Vols. 334-335
Vols. 334-335
Key Engineering Materials
Vol. 333
Vol. 333
Key Engineering Materials
Vols. 330-332
Vols. 330-332
Key Engineering Materials
Vol. 329
Vol. 329
Key Engineering Materials
Vols. 326-328
Vols. 326-328
Key Engineering Materials
Vols. 324-325
Vols. 324-325
Key Engineering Materials
Vols. 321-323
Vols. 321-323
Key Engineering Materials
Vol. 320
Vol. 320
Key Engineering Materials
Vol. 319
Vol. 319
Key Engineering Materials
Vols. 317-318
Vols. 317-318
Key Engineering Materials
Vols. 315-316
Vols. 315-316
Key Engineering Materials
Vol. 314
Vol. 314
Key Engineering Materials Vols. 324-325
Paper Title Page
Abstract: This study investigates the punching shear strength of concrete bridge decks strengthened
with various fiber reinforced polymer (FRP) materials, carbon fiber sheet (CFS), glass fiber sheet
(GFS) and carbon fiber grid (CFG). This study performed fatigue loading tests on the strengthened
bridge decks with different fatigue loading levels. Based on the experimental results, a damage
index was determined considering the damage mechanics and was applied to the plastic punching
shear strength model for the evaluation of the punching shear strength with respect to the number of
fatigue loading cycles. The developed model seems to successfully estimate the punching shear
strength of damaged bridge decks with sufficient reliability. It is anticipated, therefore, that the
developed model may help improving the design of strengthening of damaged bridge deck panels.
1313
Quasi-Brittle Fracture of Lamellar γTiAl: Simulation Using a Cohesive Model with Stochastic Approach
Abstract: Quasi-brittle fracture of fully lamellar two phase (α2+γ)TiAl is investigated both
experimentally and numerically. Fracture tests are conducted at room temperature, which fail in a
quasi-brittle and unstable manner but exhibit significant variations in crack initiation and
propagation prior to unstable failure. Fractographic investigations are performed which elucidate
the micromechanical causes of the macroscopic behaviour. The observed deformation and fracture
behaviours of the specimens are simulated by a finite element model containing cohesive elements
for modelling the material separation. In order to capture the scatter of the macroscopic behaviour, a
stochastic approach is chosen, in which local variations of cohesive parameters are taken into
account. The model can describe and explain the physical phenomena of the specific material.
1317
Abstract: Various types and forms of FRP materials have been applied for structural strengthening
of reinforced concrete (RC) beams. When CFRP plates are used, however, a premature failure used
to occur before strengthening effect appears adequately. This is primarily due to the rip-off of CFRP
plate attached on RC beams. Despite of numerous studies on the rip-off failure of externally
strengthened RC beams, the failure mechanism is not clearly explained yet. Investigations from the
literatures have shown that the rip-off failure is dependant on vertical and shear stresses at the level
of main reinforcements in RC beams. This study suggests an analytical model to investigate the ripoff
failure load based on the stresses at the level of main reinforcements. The proposed model is
relatively simple and produces very comparable results to the test data. Therefore, it is anticipated
that the proposed model can be successfully used to provide further information on the rip-off
failure mechanisms and its prevention.
1325