TB/T 3396.3-2015 English PDF (TBT3396.3-2015)

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TB/T 3396.3-2015: Test methods for fastening systems of high-speed railway - Part 3: Determination of static stiffness for fastening assembly
TB/T 3396.3-2015
TB
RAILWAY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.080
S 12
Test methods for fastening systems of high-speed railway -
Part 3: Determination of static stiffness for fastening
assembly
ISSUED ON: JULY 15, 2015
IMPLEMENTED ON: FEBRUARY 01, 2016
Issued by: National Railway Administration
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Symbols ... 4 
3 Principles ... 4 
4 Test equipment ... 4 
5 Test pieces ... 5 
6 Test steps ... 5 
7 Test report ... 6 
Test methods for fastening systems of high-speed railway -
Part 3: Determination of static stiffness for fastening
assembly
1 Scope
This Part specifies the indoor test method for the static stiffness of fastening assemblies.
This Part applies to high-speed railway fastener systems.
2 Symbols
The following symbols apply to this document.
F1: The minimum load applied to the tested fastener system, in kilonewtons (kN);
F2: The maximum load applied to the tested fastener system, in kilonewtons (kN);
D1: The displacement of the rail when loaded to F1, in millimeters (mm);
D2: The displacement of the rail when loaded to F2, in millimeters (mm);
KSTA: Assembly static stiffness, in kilonewtons per millimeter (kN/mm).
3 Principles
Apply a load, which is perpendicular to the bottom surface of the rail, to the rail
(assembled on a single bearing surface) with the fastener system assembled by the
testing machine, to determine the displacement of the rail, as relative to the sleeper,
under the load.
4 Test equipment
4.1 Steel rail
A segment of short steel rail, which has a length of about 0.5 m, the section of which is
the same as the section of the steel rail used for the tested fastening assembly or
assembly fatigue performance test. The steel rail shall be free of peeling and rust on the
surface.
4.2 Loading device
A device, which has a loading rate of 2 kN/s ~ 6 kN/s, a static loading reaching up to
110 kN, is used to apply vertical load to the rail surface.
4.3 Displacement sensor
The instrument for measuring the vertical displacement of the rail, as relative to the
sleeper, which has an indication error of 0.01 mm.
4.4 Load sensor
An instrument for measuring the load, which is applied to the rail; it has an accuracy
grade of 0.5.
4.5 Recording device
A device, that can perform digital recording and draw a load-displacement curve, during
the test. It has a sampling frequency of not less than 50 Hz.
5 Test pieces
5.1 Sleeper
Sleepers, 1/2 sleepers or slab track units with embedded fasteners or reserved bolt holes
(all described as sleepers in this test method). The bearing surfaces of the sleepers shall
not be reconditioned for testing.
5.2 Fasteners
Complete set of fasteners including all parts.
6 Test steps
6.1 Test temperature
The test shall be carried out in a room, which has an ambient temperature of 23 °C ±
5 °C. Before the test, all the fastener components used for the test shall be kept at the
above temperature environment, for not less than 24 h.
6.2 Test preparation
Fix the rail on the sleeper, by the use of fasteners, according to the standard assembly
state. Put the sleeper on the rigid foundation. Apply a load, which is perpendicular to
the bottom surface of the rail, on the top surface of the rail. Arrange four displacement
sensors, symmetrically at the four corners of the rail, to measure the vertical