An experimental study to investigate the possibility of using macro-synthetic fibers in precast tunnel segments

Download
index.pdf
2019
Tengilimoğlu, Oğuz
Show full item record
487
views
241
downloads
With the development of tunnel construction techniques, segmental tunnel linings have begun to play a crucial role in preserving ground surfaces and solving traffic problems in metropolitan areas. In parallel with growing interest in precast tunnel lining, engineers are in the Search of solutions that improve precast production efficiency and obtain higher structural performance. Nonetheless, the number of studies related to precast tunnel segments in Turkey is quite limited. Fibers have used as reinforcements in many projects due to significant advantages and nowadays, there is a general interest in the field of civil engineering on macro-synthetic fibers to use in precast tunnel segmental lining. However, it is a controversial issue on whether it is proper or not, compared to the commonly used conventional rebars. Within this framework, experimental studies on full-scale segments of Mecidiyeköy - Mahmutbey metro line project in İstanbul were performed to investigate the possibility of using polypropylene fiber reinforcements with or without using rebars in precast tunnel segments. In these experiments, for reliability and usability of glass fiber reinforced polymer rebars instead of conventional rebars were also investigated. Flexural test was carried out in order to compare the flexural bearing capacity of tunnel segments, also point load test was developed with the purpose of observing the real effect of thrust forces on precast tunnel segments.
Tunnels., Tunneling., Textile fibers, Synthetic., Underground construction., Tunnels
http://etd.lib.metu.edu.tr/upload/12623128/index.pdf
https://hdl.handle.net/11511/28052
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

AN EXPERIMENTAL STUDY ON THE CHARACTERISTICS OFn HEPTANE ETHANOL MIXTURE POOL FIRE IN A REDUCED SCALE TUNNEL
Yamalı, Uluç; Shafee, Sina; Yozgatlıgil, Ahmet (2015-09-11)
Fire accidents in recent decades have drawn attention to safety issues associated with the design, construction and maintenance of tunnels. A reduced scale tunnel model constructed based on Froude scaling technique is used in the current work. Mixtures of n-heptane and ethanol are burned with ethanol volumetric fraction up to 30 percent and the longitudinal ventilation velocity varying from 0.5 to 2.5 m/s. The burning rates of the pool fires are measured using a precision load cell. The heat release rates o...
Stability analysis, displacement monitoring and justification of the critical sections of the Konak tunnel
Yertutanol, Kadir; Akgün, Haluk; Department of Geological Engineering (2015)
The main focus of this research is numerical analysis and preliminary support design for the critical sections of the twin tube Konak Tunnel that was constructed in a highly populated area in Konak, İzmir. The displacements of the tunnel were monitored and justified by comparing with the results of the numerical analyses. The stability of the tunnel exit portal and associated slopes, which is one of the most challenging sections of the project, was analyzed as well. In study area, volcanics, pyroclastics an...
A Method for the design of FRC tunnel linings reinforced with FRP bars
Demir, Mutlu; Akyüz, Uğurhan; Department of Civil Engineering (2019)
There are some difficulties in the construction of precast conventional reinforced concrete tunnel segments. Due to corrosion problem of ordinary reinforcement, the task becomes more complicated. Moreover, the workmanship for the construction of segments is also very time consuming. There are some research for the design of tunnel segments with fiber reinforced polymer (FRP) bars. Besides, guidelines for the design of fiber reinforced concrete (FRC) tunnel linings are also available. This thesis provides a ...
Development of an IT-based tool for portfolio assessment and management for construction companies
Bilgin, Gözde; Dikmen Toker, İrem; Özorhon Orakçal, Beliz; Department of Civil Engineering (2019)
Development in the construction industry has leaded most of the construction companies to undertake more complex projects than before, which are generally executed concurrently. Therefore, project management routines of the companies may not support effective management of multi-projects. Project portfolio management approach has been suggested to meet requirements for coordinating multi-projects to meet strategic objectives under limited resources. Since project portfolio management requires a comprehensiv...
An Investigation of seismic face stability of deep tunnels by using an axisymmetric finite element model
Hadley, Hannah Elizabeth; Sucuoğlu, Haluk; Yılmaz, Mustafa Tolga; Department of Civil Engineering (2018)
The static stability of tunnel faces has been widely studied, with the development of limit analysis and numerical modelling solutions. There has been limited research into seismic tunnel face stability. The aim of this study is to find the effect of seismic loading on tunnel face stability and suggest factors that could be used in design. A numerical model using the axisymmetric finite element method is developed to assess tunnel face stability under seismic loading. To verify the numerical analysis, it wa...
Citation Formats
O. Tengilimoğlu, “An experimental study to investigate the possibility of using macro-synthetic fibers in precast tunnel segments,” M.S. - Master of Science, Middle East Technical University, 2019.
METU IIS - Integrated Information Service open@metu.edu.tr