W1 tracks kirse jb

1Light Rail Transit Facilities Design Course

Track Design

Light Rail Transit Facilities

Design Course

Track Design05.12.2010

By: Ken KirseCivil Engineer, TriMet

Track Design

Light Rail Track Design

• Wheel-Rail Interface• Track Design• Light Rail Track Materials• Track Road Crossings

• Drainage• Special Trackwork• Noise and Vibration• Electrical Isolation

Track Design

Wheel – Rail Interface

• Wheels• Where does flange go

Track Design

Why are flanges on the inside of wheels?

Track Design

Rail Sections

“Tee” Rails

Girder Rails

Track Design

Curving Characteristics

With solid axlesWith stub axles

Track Design

• Gage• Tie and ballast open track• Basis of design of tie and ballast track• Embedded on paved track

Track Design

Modulus of Track Elasticity ()

Defined as the load per unit length of rail required to depress that rail by one unit.

p = - y

p = upward pressure per unit length = track modulus of elasticity (track stiffness)y = vertical deflection of rail with wood ties = 2000 Avg., 1000 poor, 5000 stiff

Track Design

Maximum Deflection Y0 of Rail

(64 3) ¼

Y0 = maximum deflection (x=0, under wheel)

p = Dynamic wheel load (static load + 1% per MPH over 5 MPH)

= Modulus of elasticity of rail steel (30 x 106 psi)

= Moment of Inertia of rail (65.6 in4 for 115RE) = Track modulus of elasticity

AREMA recommended limit of deflection is 0.25”

Track Design

Maximum Rail Bending Moment (M0)

M0 = p

Track Design

Maximum Rail Bending Stress

C = distance in inches from the base of rail to its neutral axis

AREMA recommended maximum = 25,000 psi

Rail steel yield point = 70,000 psi

Track Design

Ballast Pressure Under Centerline of Tie (PC)

PC =16.8 Pa

h 1.25

Pa = uniformly distributed pressure over the tie face

h = depth below bottom of tie in inches

Pc of 20 psi is AREMA suggested value for firm subgrade soil.

Track Design

Unit Pressure (Pa) Transmitted from Bottom of Tie to Ballast (psi)

Pa = 2P

2/3 bL

P = wheel load (lbs) 2P = Total tie load

L = Tie length in inches

b = Tie width in inches

2/3 = factor for 2 load bearing thirds of tie

Pa should not exceed 65 psi for wood ties

85 psi for concrete ties

Track Design

115RE rail

Area = 11.2465 sq.in.

Moment of Inertia about neutral axis = 65.9

Yield Strength 70,000 psi min.

Modulus of elasticity “E” 30x106 psi

To determine tensile force for temperature change.

Rail changes 0.0000065 of its length per degree. F

S = unit stress.0000065 t =

30,000,000

Rail Stress from Temperature Change

Track Design

For 70F change

Total Restraining Force F = 70x195 x 11.2465

F = 153,515 lbs

Yield Point of 115# Rail

70,000 x 1102465 = 787,255 lbs

Insulated Joints tested to 600,000 lbs

For 1F change S = 30,000,000 x 0.0000065x1

= 195 psi

Rail Stress from Temperature Change

Track Design

Embedded Track

• Aesthetics• Maintenance considerations• Concrete track slabs• Covered tie and ballast track

Track Design

Common on bridgesDF fastenersMethods of construction

Direct Fixation Track

Track Design

Material for Light Rail Track

• Ties• Bumping posts• Switch heater• Switch stands• Insulated joints• Automatic train stop

Track Design

Light Rail Track Road Crossings

• Design considerations• Crossing materials• Drainage

Track Design

Light Rail Track Drainage

• Open track under drains• Paved track drainage• Special Trackwork Drainage

Track Design

Special Trackwork

• Definition of turnout components

• Turnout size, frog number• Frog types• Girder rail turnouts• Rail crossings, restraining rail

Track Design

Noise and Vibration

Problem Areas• Tri-Met history with Westside

Project• Noise and vibration mitigation

Track Design

Electrical Isolation

Causes of stray current• Why is stray current a problem?• Methods of controlling stray current• Monitoring stray current

Track Design

W1 tracks kirse jb

Documents

Transcript of W1 tracks kirse jb

Lecture W1

上海新国际博览中心 Shanghai New International Expo Center€¦ · d101 w1 d16 w1 4 w1 d12 w1 d10 w1 d08 5 1 d 33 d31 d29 w1 d28 w1 d30 w1 d32 w1 d34 w1 d36 w1 d38 45 d43

Championship Jumpers Event Apr 2013 _318.pdf · CH Ozzies Ramble Of Scattald Wendy Holmes Shetland Sheepdog 09472-2006 15/10/06 JB 3, JB 1, JB 2, JB 6, JB 4, JB 5 G205 Max Kate Last

W1 recommendation0522

W1 - Lesson 4: Ratios and Percents · 2019-03-13 · Preview/Review Concepts W1 - Lesson 4 Mathematics Grade 6 - TEACHER KEY W1 - Lesson 4: Ratios and Percents Welcome to W1 - Lesson

W1 introductiontoipw

· 2019-02-18 · 4 W1 W2 Front ด านหน า Side ด านข าง H W1 W1 W2 W2 W1 W1 H H H H H L Hole diameter ขนาดรูปาก Cap ฝา Dropper หลอดหยด

W1 definitions

Longman Communication 3000€¦ · a indefinite article, determiner S1, W1 abandon v W3 ability n S2, W1 able adj S1, W1 about prep S1, W1 about adv S1, W1 above adv, prep S2, W1

kormosandsmithchapter2 w1

K/)/,(W1,!E(W0) K/)/,(W1,!E(#0)

University of Wolverhamptoncm1993/papers/Bing_Search_API_2.… · Web viewThe moving 51-median of a word is the median of the (HCE(w1)- HCE(w1 w2)- HCE(w1 -w2)) / HCE(w1) scores

MODEL W1 + 480L Dissolved Ozone Monitor - W1+480L.pdf · 2020. 10. 19. · MODEL W1 + 480L Dissolved Ozone Monitor - Ideal for Water Treatment applications - MODEL W1 + 480L Dissolved

6718-W1 VDSL2/ADSL2+ Wireless Gateway - Baltic Networks...6718-W1 VDSL2/ADSL2+ Wireless Gateway 6718-W1-NA, 6718-W1-EU, 6718-W1-UK VDSL2 with Profiles 8a/b/c/d, 12 a/b, 17a or ADSL2+

1,295mm (51”) Wingspan Towline Glider Designed by Neville ... · W7 W6 W5 W4 W1 W1 W1 W1 W2 W1 W1 W1 W1 W4 W5 W6 W7 Chamfer sides Detail of assembly of towhook to ply part F11 1/16"

W1 Connector™ W1 Adapter W1 Termination...Maximum Power CW 6 W Front Side Pin Depth 0 to 0.076 mm maximum Backside Pin Protrusion 0.32 mm typical for W1-102F, W1-102M, W1-105F, W1-105M,

Introduction W1

Random Number Generator Dmitriy Solmonov W1-1 David Levitt W1-2 Jesse Guss W1-3 Sirisha Pillalamarri W1-4 Matt Russo W1-5 Design Manager – Thiago Hersan.

W1 Introduction

W1 Susdev101