Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Computers and Concrete Volume 34, Number 6, December 2024 , pages 705-722 DOI: https://doi.org/10.12989/cac.2024.34.6.705 |
|
|
|
Punching shear behavior of strengthened and unstrengthened heat-damaged reinforced concrete flat slabs: Experimental and NLFEA study |
||
Bara'a R. Alnemrawi, Rajai Z. Al-Rousan and Ayman N. Ababneh
|
||
| Abstract | ||
| The behavior of the brittle punching shear failure in two-way flat slabs was investigated in this study using experimental and nonlinear finite element analysis approaches. The reinforced concrete slabs were tested under the effect of strengthening carbon fiber reinforced polymer sheets (strengthened and un-strengthened), temperature value (23, 200, 400, and 600 oC), and the behavior was captured at the material and system levels. Generally, the punching shear performance was significantly worsened upon exposure to the heat-damage effect, where increasing the temperature value increases the resulting cracking intensity. In addition, strengthening the flat slabs improves the overall structural behavior where the ultimate loadcarrying capacities, cracking loads, and toughness values are increased. The detailed structural behavior, including the cracking propagation, failure modes, strain values, and displacement profiles at various high temperatures, were captured using the nonlinear finite element analysis. Generally, the resulting improvement is higher for specimens damaged at higher temperatures, with the load-deflection behavior flattening with increased deflection values. Moreover, toughness was improved significantly by strengthening with reduced failure brittleness. Finally, the stiffness-deflection curves at 400 oC and 600 oC specimens start with a flattened shape but experience a sudden drop in the strengthened ones, revealing that failure occurs compared to specimens at lower temperatures. | ||
| Key Words | ||
| CFRP sheets; elevated temperatures; NLFEA simulation; punching brittleness; strengthening | ||
| Address | ||
| Department of Civil Engineering, Faculty of Engineering, Jordan University of Science and Technology, PO Box 3030, Irbid 22110, Jordan | ||