Dissertation > Excellent graduate degree dissertation topics show

A Study on Composite Tunnel Fire-retardant Coating and Its Performance

Author: XiangQingSong
Tutor: GongJianQing
School: Hunan University
Course: Structural Engineering
Keywords: The Tunnel Fire-retardant Coating Fire Resistance Bond Strength Optimal Formulation Finite Element Analysis
CLC: U454
Type: Master's thesis
Year: 2013
Downloads: 48
Quote: 0
Read: Download Dissertation


Tunnel fire-retardant coating has become an effective measure of tunnelstructure fire protection due to poor performance, low cost, convenientconstruction.However, the fire resistant, bond strength and other performance remainsto be perfect.because the tunnel fire-retardant coating research and development andapplication are late. How to further improve the fire resistance, adhesive strength andother performance of tunnel fire-retardant coating is the emphasis and difficulties incurrent tunnel structure fire protection research.Thus, This paper analyzes the flame retardant mechanism of fire-retardant coating,selects the appropriate experimental materials, tests and optimizes many t imes to theproportion of composite binder, the ratio of inorganic heat insulation fillers, foamingmaterials, and the proportion of auxiliaries, explores the impact of the changes ofvarious components on the properties of fire-retardant coating, finally determines thebest dosage of the tunnel fire protection coating components, and developed thetunnel fire-retardant coating, which.good fire resistance, good water resistance,freeze resistance and acid-proof alkaline, high bond strength, high flexibility. Inaddition, with the aid of the finite element analysis software ANSYS,this papercalculates the tunnel temperature field under the hydrocarbon fire heating condition,and analyzes the impact of the tunnel fire-retardant coating tunnel on the tunneltemperature field in the fire cases.The test results show that the tunnel fire-retardant coating has good fireresistance, which can effectively prevent heat from transmitting to the tunnel inside inthe high temperature condition;The impact of all factors on tunnel fire-retardantcoating’s fire resistance from primary to secondary order is: composite binder>foaming materials> inorganic heat insulation fillers; According to the optimalformulation, the coating’s fire resistant can achieve185min when the coatingthickness is20mm and it has excellent fire resistance and good physical and chemicalproperties, which achieves the expectant purposes; Meanwhile, Compared with theexisting tunnel fire-retardant coating, the coating’s fire resistance is stronger, thebonding strength is higher, the dry density is less, the drying time is relatively shortand has good practical value.In addition, by using finite element software ANSYS, the tunnel temperature field under the action of the hydrocarbon heating conditions of calculation show thatthe heating rate of all nodes without the tunnel fire protection is very fast in the firecases, and the closer the tunnel surface node, temperature curve shape is closer tohydrocarbon curve; Along the tunnel thickness, the node temperature is graduallydecreasing, the temperature gradient is higher if it closer away from the fire surfaceand the temperature gradient is less if it far away form the fire surface. The fire has agreater influence near the place rock and lining structure at the bottom of the placeand Lining structure of arc and straight lineExperimental research and finite element analysis show that the tunnelfire-retardant coating can effectively prevent heat transmitting to the concrete, slowdown the tunnel temperature rise, greatly improve the fire resistance of components.Therefore, the tunnel fire-retardant coating for tunnel fire protection layer to consideris feasible when we carries on the tunnel fire protection design.

Related Dissertations

  1. Research on the Mainframe System of Powder Mixed EDM and the Craft Experiment,TG661
  2. EDM Electrode Wear Mechanism and Control Research,TG661
  3. Finite Element Analysis and Structure Optimal Design for Combined Seal at Normal Temperature and Low Temperature,TH136
  4. Study on the Design and Biomechanical Behaviors of Individualized Artificial Knee Joint,R318.1
  5. Design of Testing Equipment for Electronic Products,TN06
  6. Multi-pin Internal Fixation of Calcaneal Fractures in Finite Element Analysis,R687.3
  7. Sclerosing dentin interface morphology observation and Bonding Strength,R783.5
  8. Sham hose drum drive means and hydraulic system of the structure,TE973
  9. Study of the Tunnelling Laneway Drilling and Anchor Rope Installation Device,TD353
  10. Study on Mechanical Property of Plug-pin Steel Tube Scaffold Platform,U673.3
  11. Virtual Prototype Realizing and Performance Research of Longitudinal Roadheader,TD421.5
  12. The Structure Analysis and Optimization of Casey Green Laser Emission Dishes Support Bracket,TH743
  13. The Influence of Frame Structure Local Column Failure on Overall Performance,TU375.4
  14. TVM subway ticket design and analysis of the transmission device,U293.22
  15. The Structure Design and Finite Element Analysis for the Light Hydraulic Support with Auxiliary Beam,TD355.4
  16. Analysis on Static-dynamic and Fatigue Characteristics of Metallurgical Overhead Traveling Crane,TH215
  17. Research of Deep Excavation Construction Process for Nearby Subway Section Action,TU753
  18. Study on Geometric Characteristics and Fininte Element Anslysis of Hositing Ropes,TD532
  19. Strength Finite Element Analysis on Crankshaft Based on ANSYS,TK423
  20. Research on the Development of the Digital Mock-up and Functional Simulation of the Entire Cross Section Mechanical Boring Machine,TD421.5
  21. The Finite Element Analysis and Topology Optimization of Kingpin for Bogie,U270.33

CLC: > Transportation > Road transport > Tunnel project > Tunnel construction materials
© 2012 www.DissertationTopic.Net  Mobile