CHENGYU LI, P.E., S.E., Ph.D.

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CHENGYU LI, P.E., S.E., Ph.D.

Assistant

Professor

Structural Engineering

Department of Civil Engineering

University of Colorado at Denver

Campus Box 113

P.O. Box 173364

Office Phone: 303
-
796
-
4636

Email:

chengyu_li@urscorp.com



EDUCATION



Ph.D. in Struct
ural Engineering, 1995, Arizona State University, Tempe, AZ 85287, USA

M.S. in Structural Engineering, 1986,
Northeast Forestry University, Harbin, China

B.S. in Civil Engineering, 1983, Northeast Forestry University, Harbin, China


ACADEMIC EXPERIENCE


20
09
-
Present

Assistant Professor CCT
, University of Colorado at Denver, CO 80217

Courses Taught:

Structural Dynamics

Structural Steel Design

2001
-
2009

Adjunct Professor
, Univer
sity of Colorado at Denver, CO

80217

Courses Taught:

Structural Steel Design

Struc
tural Earthquake Engineering,

Structural Dynamics

Advanced
Topics in
Reinforced Concrete

Advanced Topics in Steel
Design

Prestressed Concrete (
at
CU Boulder)


C
ommittee member and advisor for master and Ph.D. programs.


1992
-
1995

Teaching and Research As
sistant
, Arizona State University, Tempe, AZ,
USA

Performed research on fiber reinforced concrete sponsored by the national
science foundation

Teaching assistant for classes of experimental stress analysis, reinforced
concrete design, and mechanics of mat
erials

1986
-
1991

Associate Professor
, Department of Civil Engineering, Northeast Forestry
University, Harbin, China

Taught undergraduate and graduate classes of structural analysis, concrete
design, bridge engineering, and engineering economy

Performed research on
bridge vibration, bridge condition evaluation, and
bridge rehabilitation

1983
-
1986

Research and Teaching Assistant
, Northeast Forestry University, Harbin,
China

Performed research on bridge vibration and impact simulations


INDUSTRIAL EXPERIENCE

1998
-
Present

Pri
ncipal Bridge Engineer and Project Manager
, URS Corporation, 8181
East Tufts Avenue, Denver, CO 80237, USA



Principal Bridge Engineer and Project Manager for
transportation

projects.
Responsibilities include bridge concept development, design technical
re
view and supervision, and project management. Projects included large
design
-
build projects, complex steel bridge rehabilitations, and concrete
and steel bridge design.



1995
-
1998

Project Structural Engineer
,

Vaughn and Melton Consulting Engineers,
Asheville, NC, U
SA

Project structural engineer for bridge and building design projects. Work
included analysis and design of reinforced concrete, prestressed concrete,
and steel bridges, design of reinforced concrete arch and box culverts,
design of residential and indust
rial buildings, and design of retaining
structures and foundations.


1983
-
1991.1

Project Structural Engineer
, Design Institute of Northeast Forestry
University, Harbin, China

Project structural engineer for design of post
-
tensioned concrete box
girder bridges, concret
e arch bridges, and concrete and steel bridges.


MEMBERSHIP IN SCIENTIFIC AND PROFESSIONAL SOCIETIES

Member, American Concrete Institute

Associate Committee Member, ACI Fiber Reinforced Concrete Committee 544

Member, American Society of Civil Engineers

Me
mber, American Institute of Steel Construction


PROFESSIONAL REGISTRATION


Professional Engineer:
Colorado, Utah, New Mexico, North Carolina, Washington

St
ructural Engineer:
Arizona, Washington
, Utah


REVIEWER

ACI Materials Journal


AREAS OF TEACHING AN
D RESEARCH INTERESTS

Teaching:

mechanics of materials, structural analysis, experimental stress analysis,
reinforced concrete design, prestressed concrete design, steel design, structural dynamics,
structural seismic design, bridge engineering


Research:

Bridge vibration and seismic design, experimental structural evaluation,
structural monitoring and non
-
destructive testing, structural system modeling and retrofit
techniques, concrete composite materials


SPONSORED RESEARCH


Fiber Reinforced Concrete (199
2
-
1995), Sponsored by the National Science Foundation

Bridge Expansion Joint Evaluations and Rehabilitation (1987
-
1989), Sponsored by the
Harbin Department of Transportation

Bridge Dynamic and Live Load Impact Evaluations (1986
-
1988), Sponsored by the
Chin
a Forestry Ministry


PROJECT

EXPERIENCE

RTD FASTRACKS
,
North Metro Corridor
,
Denver, CO
:

Lead
Structure
Engineer
responsible
for the
preliminary
design of all structures

on the RTD Fastrack
s

North Metro
Corridor project.

The North Metro corridor provide
s

1
8 miles of commuter rail transit
with 8
P
ark
-
n
-
Ride stations between Denver Union Station and 162
nd

Avenue
. Major
structures include 15 bridges, including one 6500 ft long bridge,
3

pedestrian
underpasses

and 3
5

major retaining walls.


TXDOT, SPUR
-
601 D
esign/Build, TX:

Lead Project Bridge Engineer for the design of
WN connector and the main viaduct on the project. The WN connector has 19 spans of
prestressed concrete Type IV girders. The substructures include hammerhead and multi
-
column bents supported o
n drilled shafts. The main viaduct has 53 spans of prestressed
concrete Type IV girders

with a total length of 6500 ft.
. The substructures include multi
-
column bents, post
-
tensioned hammerhead and straddle bents. All bents are supported on
drilled shafts.


MODOT, I
-
64
Design/Build,
MO
:

Project Bridge Engineer for the
seismic analysis and
design of five bridges on the project. Three
-
dimensional models with soil
-
structure
interaction were used to determine the seismic forces and displacements. Response
spectr
um analysis was carried out with SAP2000 program
. The columns, connections, and
foundations were designed for the seismic forces and displacements.


CALTRANS, SR
-
22 Design/Build, CA:

Project Structural Engineer responsible for
design of various types of
retaining walls, moment slab barriers and
major

drainage
structures. Retaining walls include cantilever walls with footing and pile foundations,
MSE walls and tieback walls. Drainage structures include two complex headwalls, a 3
-
sided open channel conflue
nce structure and various other non
-
standard drainage
structures.


MNDOT,
Roc
52 Design/Build, MN:

Lead
Bridge Engineer for the design of
three
bridges on the project
. Precast/prestressed concrete girders were used for the
superstructures. The abutments w
ere
tall
walls
supported
on steel H
-
piles with pilasters
and the piers consisted of concrete caps and columns supported on steel H
-
piles. Form
liner was used on all exposed surfaces.


St. Louis Bay Bridge, MS, Mississippi Department of Transportation.
Pro
vided
design oversight, review of plans, and checked design calculations.


E
-
470 Public Highway Authority, Denver, CO:

Project Engineer for the widening
design of two bridges. The
precast/prestressed concrete girders were used for
superstructure and the s
ubstructures included integral abutments on H
-
pile and concrete
columns founded on shafts.


E
-
470 Public Highway Design/Build E
-
470/I
-
70 Interchange, Denver, CO:

Design
overview of the E
-
470/I
-
70 interchange for E
-
470 Public Highway Design/build project.
The main structure is an 11
-
span precast concrete Tub girder bridge. The superstructure is
curved and consists of three continuous units with post
-
tensioning. The concrete piers are
supported on caissons and abutments are founded on steel piles.


CDOT, US
287, Loveland, CO
: Lead Bridge Engineer responsible for the design of
four precast/prestressed Bulb Tee GIRDER bridges. The substructures included integral
abutments on H
-
pile and concrete column piers founded on caissons.


CDOT, 120th Avenue Bridges, CO:

Lead Structural Engineer for the design of three
bridges, including a 5
-
span bridge and two single
-
span bridges. Precast/prestressed
concrete Bulb
-
Tee girders were used for the superstructures. The end bents were
concrete caps on stele HP piles and the

interior bents were concrete columns on drilled
concrete shafts. Architectural form liner and stone accent columns were used on the
bridge for aesthetic effects.


CDOT, Crews Gulch Bridge on SH 85, Colorado Spring, CO:
Project Structural
Engineer for a s
ingle span precast/pretressed Bulb
-
Tee girder superstructure with span
length of 38 meters and integral abutments on steel piles. The bridge was located in an
urban area and designed with raised median and sidewalk and a bike path underneath the
bridge.


C
ity and County of Denver,
Central Park Blvd Extension
, Denver, CO:

Lead
Structural Engineer for the design

of three bridges, including a 2
-
span bridge
over I
-
70
and two bridges

over ramps
. Precast/prestressed concrete Bulb
-
Tee girders were used for
the su
perstructures. The end bents were concrete caps on stele H piles and the interior
bents were concrete columns on drilled concrete shafts. Architectural form liner and
special railings
were used on the bridge
s

for aesthetic effects.


City and County of De
nver,
56
th

Avenue Reconstruction
, Denver, CO:

Lead
Structural Engineer for the design

of three highway bridges and one pedestrian bridge for
the project
.
The WB bridge over Haulroad is a new structure with p
recast

prestressed
concrete girders.
The existing

Haulroad bridge
is used for the EB traffic and
rehabilitation was designed to strengthen the abutments, replace the sidewalk and curbs,
and replace the expansion joints.


City and County of Denver, 6th Avenue Viaduct Condition Evaluation and Retrofit
Desi
gn, Denver, CO:
Principal Investigator and Project Manager for this viaduct built in
1960’s and modified in 1990’s. The structure consists of 18 spans of composite steel
girders with a total length of 1430 feet. The viaduct showed extensive deterioration.
Field
investigation was conducted to determine the bearing and other structural element
conditions and bridge movements. Stresses due to temperature fluctuation were measured
on steel columns using strain gages. Critical fatigue details were tested using u
ltrasonic
and dye penetrant techniques to detect potential cracks. A three
-
dimensional frame model
using SAP2000 was used to study the superstructure and substructure under thermal and
other loading conditions. Structural deficiency was identified with con
crete deck, steel
girders, bearings, piers, and foundations. The retrofit involves replacing bearings and
columns and strengthening the foundations.


City and County of Denver, 8th Avenue Viaduct Thermal Analysis and Condition
Assessment, Denver, CO:

Princ
ipal Investigator and Project Manager for this viaduct
built in 1980’s. The structure consisted of 20 spans of twin continuous steel box girders
with a total length of 2361 feet. The bridge was on three horizontal compound curves and
two vertical curves. T
he original guide system failed and extensive cracks were present
on all concrete piers. Field investigations were conducted to assess the bearing
movements and crack extension. A three
-
dimensional finite element model using ANSYS
was developed to study th
e structural movement and stresses due to thermal variation and
other design loads. The cracks on the pier were studied for structural strength and
integrity.


City and County of Denver, West Evans Avenue Bridge over South Santa Fe Drive,
Denver, CO:

Prin
cipal Investigator and Project Manager for this project to assess the
structural conditions. The bridge consists of 9 spans of steel composite girders with a
total length of 765 feet. Field investigation was conducted to evaluate the bridge existing
condit
ions. Displacement measurement system was installed on the bridge to monitor the
bridge movement due to temperature fluctuation. Non
-
destructive testing was performed
on the steel girders and concrete piers to determine the steel corrosion and concrete
cra
cking. The bridge was studied for the structural capacity and retrofit recommendations
were provided for the steel girders, bearings, and concrete piers.


City and County of Denver, Lower Colfax Bridge, Denver, CO:
Project Structural
Engineer provided stru
ctural selection, preliminary design, and final superstructure
design. The replaced structure consisted of three spans of precast/prestressed concrete
box girders. Integral piers and abutments with drilled caisson foundation were used.


Foundation Coal, SH

14/16 Relocation, Wyoming:

Lead Bridge Engineer

for
a three
-
span
composite steel plate girder bridge.
The bridge was
located

over a reclaimed section of the Eagle
Butte Mine that was backfilled with up to 275 feet of mining backfill material. The potenti
al
consolidation settlement is the major concern for the design of the roadway and bridge.
The
f
oundation
utilized o
ver
-
excavation with re
-
compaction
t
o a depth of approximately 10 feet
below the bottom of the footings

and g
eopiers
to

a depth of approximat
ely 20 feet below the
bottom of the over
-
excavation beneath. Special steel settlement plates were installed under the
bearings so they can be removed in the future to adjust the deck profile for the uneven
settlements between the abutments and the piers.


WVDOT, Bridge on US 52, near Huntington, WV:

Project Structural Engineer for the
design of a dual mainline bridge on US 52. The bridge was a three
-
span AASHTO Type
IV girders with deck slab continuity at interior bents. Integral end bents and solid wall
p
iers were supported on steel HP piles.


NCDOT, Truelight Church Bridge Over Charlotte Outer Loop, Charlotte, NC:

Project Structural Engineer for this two
-
span steel plate composite bridge with span
lengths of 44 m and 43 m. The bridge was on a 51
-
degree sk
ew and located on a curved
section of the roadway. The substructure was steel HP pile end bents and intermediate
concrete column bent with steel HP pile foundation.


NCDOT, New Land Bridge, New Land, NC:
Project Structural Engineer for the design
of a sing
le span bridge with AASHTO Type IV girders and integral abutments on steel
HP piles.


NCDOT, Bridges on Charlotte Outer Loop over CRX, Charlotte, NC:
Structural
Project Engineer for the design of a four
-
span AASHTO Type IV girder bridge and a
two
-
span stee
l plate girder bridge. The first bridge was 110 meters long and located on
both horizontal and vertical curves. The second bridge was 68 meters long. The
substructure included end bents of concrete caps on steel piles and interior bents of
concrete columns

on concrete footings founded on steel piles.


PUBLICATIONS

"F
atigue of Concrete Beams Strengthened with Advanced Glass
-
Fiber Composite under
Flexure
,"
in review, ACI Materials Journal.

"Performance of Polymer Modified Asphalt Bridge Expansion Joints in Lo
w
Temperature Regions," ASCE
Performance of Constructed Facilities
, Vol. 23, Number 4,
pp.
227
-
233
.

"Finite Element Simulations of Fiber Pullout Toughening in Fiber Reinforced Cement
Based Composites," Advanced Cement Based Materials, 7, 1998, pp. 123
-
132.

"Effect of Interfacial Properties on the Crack Propagation in Cementitious Composites,"
Advanced Cement Based Materials, 4, 1996, pp. 93
-
105.

"Mechanical Properties of Hybrid Cement Based Composites," ACI Materials Journal,
May
-
June, 1996, pp. 284
-
292.

"
Modeling of Stiffness Degradation of the Interfacial Zone During Fiber Debonding,"
Composites Engineering, Vol. 5, No. 10
-
11, 1995, pp. 1349
-
1365.

"Experimental R
-
Curve for Assessment of Toughening in Micro
-
Fiber Reinforced Hybrid
Composites," American Con
crete Institute, SP
-
155, 1995, pp. 93
-
114.

"Bridge Vibration and Impact under Moving Vehicles," Proc. 1996 Engineering Systems
Design and Analysis Conference, Volume 9, Structural Dynamics, Vibration, and
Buckling, ASME 1996, pp. 17
-
23.

"Processing Techniq
ues for Manufacturing High Volume Fraction Cement Based
Composites," Proc.,

First International Conference on Composites in Infrastructure,
January 15
-
17, 1996, pp. 123
-
136.

"Effect of Bridge Deck Roughness on Bridge Dynamic Response," Proc., 7th
Internat
ional Conference on Computational Methods and Experimental Measurements,
VII, May 1995, pp. 485
-
492.

"Modeling of Fiber Pullout in Cement Based Composites Using an R
-
Curve Approach,"
Proc. of the Third Materials Eng. Conference, Infrastructure: New Materia
ls and Methods
for Repair, 1994, pp. 559
-
566.

"Tensile Fracture of Carbon Whisker Reinforced Cement Based Composites," Proc. of
the Third Materials Engineering Conference, Infrastructure: New Materials and Methods
for Repair, ASCE 1994, pp. 551
-
558.

"Fract
ure of Whisker Reinforced Cement Based Composites," Proc., International
Symposium, Brittle Matrix Composites 4, 1994, pp. 116
-
124.

"Effect of Interfacial Properties on the Strength of Cementitious Composites," Proc., The
First International Conference on
Composites Engineering (ICCE/1), 1994, pp. 351
-
352.

"Finite Element Simulations of Toughening in Cement Based Composites," MRS 1996
Fall Meeting, Symposium HH: Structure
-
Property Relationships in Hardened Cement
pastes and Composites, Boston, Mass.

"Study

of Bridge Vibration due to Moving Vehicles," Proc. 1994 Engineering Systems
Design and Analysis Conference, Volume 7, Structural Dynamics and Vibrations, ASME
1994, pp. 59
-
66.

"Bridge Vibration Study," 1991 Symposium of Bridge and Highway Engineering,” 19
91.

"Study of Bridge Vibration due to Vehicles Moving on Irregular Bridge

Decks," Journal
of
Northeast Highway Engineering, Vol. 1, pp. 74
-
78, 1990.

"Bridge Vibration due to Local Deck Depressions," Journal of Transportation, Vol. 4, pp.
44
-

50, 1987.