Part A- Experimental: Experimental Analysis of Crack Propagation in Pre-stressed Concrete Sleepers by Fracture Mechanics

Authors

  • Freydoon Rezaie Associate Professor, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
Abstract:

This study investigates propagation of mode I crack in B70 pre-stressed concrete sleepers by fracture mechanics approach. A new experimental analysis is done for notched B70 pre-stressed concrete sleepers with Replica test and image analysis. A scanning electron microscope test (SEM) and an image analysis are applied for the Replica test in order to determine crack length and crack mouth opening displacement (CMOD). The experimental data extracted from the three-point bending load test of B70 sleepers are analyzed with fracture mechanics method. In this study, the fracture mechanics parameters of a sleeper are investigated based on nonlinear fracture mechanics (NLFM) principles for concrete material. Sleepers with initial crack width of 8 mm and different initial crack lengths of 5 mm to 45 mm, with a 10 mm increasing step, are tested. Five specimens’ of each group are loaded under three-point bending load test, in order to determine the propagated crack length, crack mouth opening displacement (CMOD), final load and the specimens’ energy. The results showed that by increasing the crack-to-depth ratio, both final load and specimens’ energy values are decreased linearly. Also, these analyses confirm that the structural behavior of the pre-stressed concrete sleepers can be predicted by a simple fracture mechanics test, such as beams in bending, provided that the related structural conditions like initial crack length and CMOD, are known.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

part a- experimental: experimental analysis of crack propagation in pre-stressed concrete sleepers by fracture mechanics

this study investigates propagation of mode i crack in b70 pre-stressed concrete sleepers by fracture mechanics approach. a new experimental analysis is done for notched b70 pre-stressed concrete sleepers with replica test and image analysis. a scanning electron microscope test (sem) and an image analysis are applied for the replica test in order to determine crack length and crack mouth openin...

full text

Experimental Analysis of Fracture and Damage Mechanics of Pre-Stressed Concrete Sleepers B70: Part B- Analysis

Initial cracks occur in high strength concrete sleepers for various reasons, such as shrinkage and wrong curing and long lifetime of over 50 years of sleepers. These cracks may lead to complete failure of the structure. In order to more accurately design the sleepers, fracture mechanics (not strength of materials) should be incorporated. In order to achieve this purpose, it is important to fore...

full text

experimental analysis of fracture and damage mechanics of pre-stressed concrete sleepers b70: part b- analysis

initial cracks occur in high strength concrete sleepers for various reasons, such as shrinkage and wrong curing and long lifetime of over 50 years of sleepers. these cracks may lead to complete failure of the structure. in order to more accurately design the sleepers, fracture mechanics (not strength of materials) should be incorporated. in order to achieve this purpose, it is important to fore...

full text

Cracks Analysis in Zavin Concrete Dam Using Fracture Mechanics Approach

Most of the existing concrete dams are subjected to cracking. These cracks are caused by various factors such as construction practices, curing, loads and volume change of mass concrete which reduce the efficiency, failure or instability of concrete dams. Using fracture mechanics as a new method to estimate stability and durability of concrete dams is recommended in scientific publications in w...

full text

the effectiveness of strategy-based instruction in teaching english as a second or foreign language: a meta-analysis of experimental studies

a large number of single research studies on the effects of strategy-based instruction (sbi) in teaching english as a foreign or second language has been conducted so far. however, the lack of a comprehensive meta-analysis targeting the effectiveness of english language sbi is observed. moreover, the findings of experimental studies regarding the context of the english language, proficiency lev...

Fracture Mechanics Analysis of Composite Microcracking: Experimental Results in Fatigue

A recent variational mechanics analysis gives the energy release rate due to the formation of a new microcrack between two exisiting microcracks (John A. Nairn, J. Comp. Mat., 23, 1106 (1989)). This analysis has been useful in providing fracture mechanics interpretation of matrix microcracking in cross-ply laminates. This paper describes using the new energy relase rate analysis for a fracture ...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 4  issue 3

pages  163- 177

publication date 2017-03-01

By following a journal you will be notified via email when a new issue of this journal is published.

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023