geometric design lab - lab

8/8/2019 Geometric Design Lab - Lab ..

http://slidepdf.com/reader/full/geometric-design-lab-lab- 1/18

Copyright © 2005 by Dr. Thomas W. Rioux, P.E.

Updated February 1, 2008 by Ioannis Tassoulas, P.E

Students taking this course may print one copy of this document for their personal class use (1/2 inch

margins).

Objective: Learn superelevation runoff design using GEOPAK.

Activity: Start Windows Explorer and connect your CE-LRC student directory; Go at theBlackboard and under COURSES > 08SP HIGHWAY ENGINEERING (15170) > COURSEDOCUMENTS > CE 367 LAB FILES copy the Texas Department of Transportation (TxDOT)

GEOPAK Superelevation parameter files txdot_e_uc.csv, txdot_length_uc.csv, and txdot_uc.sep toyour MicroStation directory; Start MicroStation and create a 2D design file "lab_07.dgn" using theseed file "train2d.dgn"; Start GEOPAK, set the standard GEOPAK user preferences for this classand set the standard COGO preferences for this class; Create a GEOPAK Project named lab_07using Job Number 07 with Subject of "Superelevation Runoff" and set Coordinate Geometry forTemporary Visualization; Store the points for the centerline; Store the horizontal circular curve bytangents; Create the centerline chain from elements; Draw the centerline chain and station thecenterline chain; Place a flat vertical profile at elevation 0.0; Define the superelevation parameters;Process the cross sections; Draw the Pavement Edge Profiles; Place a landscape oriented rectanglecentered around the drawings in 8.5" by 11" proportion; Place the title "Lab Assignment 07" at thetop center and your name, class name, and assignment due date in the middle left; Place a fence fromthe rectangle and plot the drawing; and Exit MicroStation.

Background: Tangent runout is the length along a highway needed to transition between sections

with normal crown and with adverse crown removed (zero cross slope) . Superelevation runoff is thelength along a highway needed to accomplish the change in cross slope between a roadway sectionwith adverse crown removed (zero cross slope) and a fully-superelevated section. The methodologyoften used, and recommended by AASHTO, to determine the length of superelevation runoff is basedupon the relative pavement edge profile slope with respect to the centerline profile of a two-lanehighway. This slope is taken as 1:200 (relative elevation change in the pavement edge profile overlongitudinal distance) (1 foot of elevation change in 200 feet ) for a lane width of 12 feet and a designspeed of 50 miles/hr. The 12 foot lane width should be used for all lane widths between 10 feet and 12feet. In recognition of the fact that longer superelevation runoff length is desirable for higher speeds,

AASHTO recommends values for relative pavement edge profile slope ranging from 1:128 at a designspeed of 15 miles/hr to 1:286 at a design speed of 80 miles/hr. Tangent runout should be effected atthe same rate used for superelevation runoff. The length needed to transition from normal crown tofully superelevated is thus tangent runout plus superelevation runoff.

Spiral curves are desirable to accomplish superelevation runoff. AASHTO suggests that thelength of spiral should be the same as the length of superelevation runoff and that the end of the spiralat the tangent (TS or ST) should be located at the station where adverse crown has been removed (endof tangent runout). For curves without spirals, generally, 60 to 80 percent of superelevation runoff length is located on the tangent with the remaining 40 to 20 percent on the curve.

These concepts of superelevation runoff and tangent runout design are implemented inGEOPAK. Please see 2001 AASHTO Green Book pages 169-183.

A. Start Windows Explorer and connect your CE-LRC student directory.

metric Design Lab - Lab Assignment 07 - Define Superelevation Ru... http://www.ce.utexas.edu/prof/kockelman/ce367_200501/lab_assignme...

18 07/11/2010 05:22



B. Go at the Blackboard and under COURSES > 07SP HIGHWAY ENGINEERING (15051) >COURSE DOCUMENTS > CE 367 LAB FILES copy the Texas Department of Transportation(TxDOT) GEOPAK Superelevation parameter files txdot_e_uc.csv, txdot_length_uc.csv, andtxdot_uc.sep to your MicroStation directory.

C. Start MicroStation and create a 2D design file "lab_07.dgn" using the seed file"train2d.dgn". Make sure that the Working Units are feet with a resolution of 1000000 units per footand that the Global Origin is zero (keyin "GO=$").

D. Start GEOPAK, set the standard GEOPAK user preferences for this class and set the standardCOGO preferences for this class.

E. Create a GEOPAK Project named lab_07 using Job Number 07 with Subject of "SuperelevationRunoff" and set Coordinate Geometry for Temporary Visualization.

F. Store the points for the centerline.

F.1. Store Point Number 1 at an X of 5000 and a Y of 5000.

F.2. Store Point Number 2 at a Bearing of N 90 E and a Distance of 1000 feet from Point Number 1.

F.3. Store Point Number 3 at a Bearing of S 45 E and a Distance of 1000 feet from Point Number 2.

F.4. Minimize the Coordinate Geometry dialog box. In MicroStation Window 1, choose the Fit Viewicon. The 3 points should be visible.


18 07/11/2010 05:22



G. Store the horizontal circular curve by tangents using a Curve Name of CV1, Station set off, aBack Tangent with PB of 1 and PI of 2, Element set to Radius of 1200 feet, and an Ahead Tangent withPoint Ahead (PA) of 3. Minimize the Coordinate Geometry dialog box. In MicroStation Window 1,

choose the Fit View icon. The 3 points and the curve should be visible.

H. Create the centerline chain from elements with a Chain Name of CH1, Begin at 0+00, the 1stsegment is Point 1, the 2nd segment is Curve CV1, and the 3rd segment is Point 3. Minimize theCoordinate Geometry dialog box. Minimize the Coordinate Geometry dialog box. In MicroStation

Window 1, choose the Fit View icon. The 3 points, the curve, and the chain should be visible.


18 07/11/2010 05:22



I. Draw the centerline chain and station the centerline chain.

I.1. Draw the centerline chain using the Design and Computation Manager using the TexasDepartment of Transportation (TxDOT) GEOPAK parameter file "x:\microstation\txengd.ddb"selecting FEATURES then DRAFTING STANDARDS, then Alignments, then BL Baseline HorizontalAlignment, and finally Draw Plan & Profile for Job 07 setting Operation to Chains, Curve Data to on,all other options to off, and Label Scale to 200 for Chain CH1.

I.2. Station the centerline chain setting Operation to Stationing, Tick Marks to on, Tick Marks

Stations to on, PC & PT & CS... labels to on, PI labels to on, Small Ticks to Ticks LT; Labels LT,Large Ticks to Ticks Both; Labels LT, Control Point Labels to As Per Preferences, and Label Scale to200 for Chain CH1.

I.3. Close the Plan & Profile Draw dialog box and close the Design and Computation Manager dialog box.

I.4. In the Coordinate Geometry dialog box, choose Tools -> Clear Visualized Elements (Temporary).

I.5. Move the Curve Data so the PI is visible.

I.6. In MicroStation Window 1, choose the Fit View icon. The centerline chain and stationing should be

visible.


18 07/11/2010 05:22



J. Place a flat vertical profile at elevation 0.0.

J.1. Choose Applications -> GEOPAK ROAD -> Geometry -> Layout Profiles (VPI based).

J.2. In the Settings dialog box, set Job Number to 07, set Operator Code to your 2 initials, and set PGLChain to CH1. In the Location and Scales group, set Horizontal Scale to 10.000000, set Vertical Scaleto 1.000000, set Reference Station to 0+00.00, set Reference Elevation to 0.000000, set X to 5000.0, set

Y to 4000.0, and press the OK button.


18 07/11/2010 05:22



J.3. In the Profile Generator dialog box, set Station to 0+00.00 and set Elevation to 0.00.

J.4. In the Profile Generator dialog box, press the Insert After push button. In the VPI 1 group, set BkGrade to 0.0000 and press the Enter key and in the VPI 2 group, set Station to 19+48.37 (the POT at the

end of the chain) and press the Enter key. In the VPI 1 group, the Length will be set to 1948.37 and in the

VPI 2 group, the Elevation will be set to 0.00.

J.5. In the Profile Generator dialog box, choose File -> Save As.


18 07/11/2010 05:22



J.6. In the Save Profile As dialog box, set Profile to PROF1, set File to 07o<your_2_initials>.inp, and

press the OK push button.

J.7. In the Information dialog box stating "Profile PROF1 stored", press the OK push button. Finally,

close the Profile Generator dialog box. If an Alert dialog box stating "Do you want to save your profile?"

appears, press the No push button.

K. Define the superelevation parameters.

K.1. Choose Applications -> GEOPAK ROAD -> Cross Sections -> Superelevation Shape ManagerTools.

K.2. In the Superelevation Shape Manager Tools dialog box, choose the Automated Superelevation icon

(leftmost icon) .

K.3. In the Automated Superelevation dialog box, choose File -> Directories, then press the Clear Allpush button, and finally press the OK push button.

K.4. In the Automated Superelevation dialog box, choose File -> Preferences.

K.5. In the Superelevation Preferences dialog box, choose File -> Open.

K.6. In the Superelevation: Open Preference File dialog box, under Drives, select X; under List Files of Type, select *.sep; under Directories, choose X:\MicroStation; under Files choose txdot_uc.sep, and

press the OK push button.


18 07/11/2010 05:22



K.7. In the Superelevation Preferences dialog box, select the e tab and set e Method to Radius Table, the

Table Name: should already be set to X:\MicroStation\txdot_e_uc.csv, set Speed Interpolation toLinear, set Radius Interpolation to Linear, and set e Rounding Increment to 0.100000.

K.8. In the Superelevation Preferences dialog box, select the Runoff Length tab and select Spiral Length= Runoff Length + Tangent Runout, set Runoff Length Method to Relative Gradient Table, the TableName should already be set to X:\MicroStation\txdot_length_uc.csv, set Speed Interpolation to Linear,

set Width Basis to Actual Lane Width, set Nominal Lane Width to 12.00, set Consider Half Lane If Width < to 0.00, and set Length Rounding Increment to 1.000000.


18 07/11/2010 05:22



K.9. In the Superelevation Preferences dialog box, select the Tangent Runout tab and set TangentRunout Distance to By Relative Gradient and set Total Length Rounding Increment to 1.000000.

K.10. In the Superelevation Preferences dialog box, select the Distribution tab and set UndividedRoadway Distribute Over to Tangent Runout + Runoff Length with 66.666670 % On Tangent, set

Divided Roadway (High Side) Distribute Over to Tangent Runout + Runoff Length with 66.666670 %On Tangent, set Divided Roadway (Low Side) Match High Side Full Super Station, and set StationRounding to Round Full Super Stations to Even 1.000000.


18 07/11/2010 05:22



K.11. In the Superelevation Preferences dialog box, select the Rotation tab and set Transition Profile to

Linear By Slope, set Outside Lane Rotation to Rotate To Match Inside Lane, and choose the left iconfor Axis Of Rotation (Two Lane Undivided).

K.12. In the Superelevation Preferences dialog box, select the Reverse Curves tab and in the Critical Case

(Maintain Normal Crown Section) section set Maintain Minimum Length to 1.000000, set Treatment to

Hold Relative Gradient, Slide Transition Stations, and set Minimum Length Distribution to By DegreeOf Curvature; and in the Supercritical Case (Remove Normal Crown Section) section set SupercriticalLength to 0.000000, set Treatment to Combine Transitions - Position 0%, Specify Relative Gradient,

set 0% Positioning to By Degree Of Curvature, and set Relative Gradient to Unadjusted FS Station toFS Station.


f 18 07/11/2010 05:22



K.13. In the Superelevation Preferences dialog box, select File -> Save.

K.14. In the Superelevation Preferences dialog box, select File -> Exit.

K.15. In the Automated Superelevation dialog box, set Job to 07, set Design Speed to 30, set PreferenceFile to txdot_uc, set e Selection to 8% e max, set Chain to CH1, set Begin to 0+00.00, set End to

19+48.36 (NOTE: this is 0.01 less than the POT value to avoid rounding issues in GEOPAK), set

Facility to Undivided, and set L Selection to all cases. Press the Left tab and set Profile to PROF1, set

Tie to Offset, set Offset to 0.0000, and set Create Input File to super07.inp.

K.16. In the Automated Superelevation dialog box, press the Quick Entry icon . In the Quick Entry


f 18 07/11/2010 05:22



dialog box, set Facility to Undivided, set Lane Widths to 12.0000 feet, set Total Number of Lanes to 2,

set Nominal Percent Slope to -2.0000, and finally press the OK push button.

K.17. In the Automated Superelevation dialog box, press the Left tab.

K.18. In the Automated Superelevation dialog box, press the Right tab.


f 18 07/11/2010 05:22



K.19. In the Automated Superelevation dialog box, press the Generate Superelevation Transitions push

button.

K.20. In the Text Editor: super07.inp dialog box, review the Superelevation Settings and Parameters

(NOTE the filler line station values and slope values), close the Text Editor: super07.inp dialog box, and

close the Automated Superelevation dialog box.


f 18 07/11/2010 05:22




f 18 07/11/2010 05:22



L. Process the cross sections.

L.1. In the Superelevation Shape Manager Tools dialog box, choose the Autoshape Builder icon (2nd icon

from the left) .

L.2. In the Superelevation Autoshape Builder dialog box, set Autoshape Input File to X:\MicroStation \super07.inp, deselect Display Only, deselect Override Input File Level Symbology, press the DrawSuperelevation Shapes push button, and close the Superelevation Autoshape Builder dialog box.


f 18 07/11/2010 05:22



L.3. From the MicroStation dialog box, set the View Attributes for Fill to off for All views.

L.4. In MicroStation Window 1, choose the Fit View icon. The centerline chain and stationing and the

superelevation shapes should be visible.

L.5. In MicroStation Window 1, choose the Zoom In icon 4 times centered on the PC of the curve. The

centerline chain and stationing and the superelevation shapes should be visible.


f 18 07/11/2010 05:22



L.6. Print the file super07.inp using a fixed-width font such as Courier New, staple the printout behindyour plot, and turn in the printout with your plot.

M. Draw the Pavement Edge Profiles.

M.1. Using MicroStation, place a horizontal line starting at an X of 5000 and a Y of 4000, a lengthequal to the length of Chain CH1, and using level of Level 2 (level=Level 2), color of white (color=0),style of centerline (style=4), and weight of 0 (weight=0) .

M.2. Label the X and Y Axis (the X Axis should be 1 foot per 1 foot and the Y Axis should be 1percent per 50 feet) using Font=3=ENGINEERING and Text Height, Text Width, and Line Spacing of 25 feet ( Hint : temporarily copy parallel the horizontal line from Step M.1 above and below the zero value 50

feet to create the 4, 3, 2, 1, -1, -2, -3, and -4 cross slopes then place a line from the 4 to the -4 line and

finally copy parallel this line the required distances from the Text Editor: super07.inp dialog box from Step

K.20) ( Hint: use Right-Center Justification and the Intersection Snap for the Y Axis labels with the text of a

zero then a blank then a minus sign then a blank ("0 - ") and an active angle of 0 and use Left-Center

Justification and the Intersection Snap for the X Axis labels with the text of a minus sign then a blank then

the station value ("- 0+00.00") and an active angle of 90).

M.3. Draw and label the Outside Left Pavement Edge and Inside Right Pavement Edge using level of

Level 2 (level=Level 2), color of white (color=0), style of solid (style=0), and weight of 2 (weight=2)( Hint : use Intersection Snap).

N. Place a landscape oriented rectangle centered around the drawings in 8.5" by 11" proportion(2340 feet by 1800 feet) with level of Level 1 (level=Level 1), color of white (color=0), style of solid


f 18 07/11/2010 05:22



(style=0), and weight of 0 (weight=0).

O. Place the title "Lab Assignment 07" at the top center and your name, class name, and assignmentdue date in the middle left using a text height, text width, and text line spacing of 50 feet with font of 3(font=ENGINEERING), justification of Center Center, level of Level 1 (level=Level 1), color of white(color=0), style of solid (style=0), and weight of 0 (weight=0).

P. Place a fence from the rectangle placed in Step N and plot the drawing using options for fence,

Monochrome, printer.plt, letter, landscape, a scale of 250 ft / in, fence boundary off, and plot borderon.

Define Superelevation Runoff using GEOPAK Plot

Q. Exit MicroStation.

Lab Assignment 07 is due 18-Mar-2008 at the beginning of class with assignment 8 due to mid-termexam.

Latest Update: 01 Feb 2008 05:14 PM


geometric design lab - lab

Documents