CES 5715 PRESTRESS CONCRETE
ASSIGNMENT # 2
DUE JANUARY 20, 2015
1.
For the prestressed concrete beam shown below, compute the stress distribution in the
crosssection at midspan due to prestress, dead load of beam and an uniform live load of
2k/ft using:
Design Standard
Building Code
Review of Beam Design
to ACI 318
31811
Requirements for
St t l Concrete
Structural
C
t
(ACI 318
31811) and
Source: Portland Cement
Commentary
Association, Skokie, IL
(ACI 318R
318R11)
1
1
2
Source: Portland Cement Associat
9/17/2015
Example 72
Equilibrium Torsion
Courtesy Pearson
Details
Cantilever Beam 54 in long
DL = 20k 6 in from end and away
from vertical axis
LL = 20k 6 in from end and away
from vertical axis
6 in away from vertical axis
fc = 4 ksi, Grade 60 steel
Des
Introduction to Transportation Safety
1. Why do we need to learn transportation safety?
Transportation safety is concerned with the protection of life and property through
regulation, management and technology development of all forms of transportation.
9/17/2015
One way joist system
Design end span AB of
exterior spandrel beam on
grid line 1
Given:
Example 74
Factored DL = 157 psf
Factored LL = 170 psf
Factored DL + Loads
directly applied 1.1 k/ft
Compatibility Torsion
Use ACI Coefficients.
fc = 4 ksi,
Transfer Length, lt
End Zone Design
Text
Ch 4
Distance over which the effective
prestressing force is transferred (in
pretensioned members)
Zero stress at end
Effective stress, fpe at end
Transfer length
Determined experimentally
Large scatter
Depen
Todays class
Optimization of prestressed sections
Basis
Numerical Examples from text
Flexure Design
Minimum weight slab
Minimum weight beam
Optimal Double Tbeam
Anchorage and Development Length
End Reinforcement for Pretensioned Members
End Zone
TRANSFER LENGTH
In pretensioned members the prestressing
_ tendons are anchored by its bond with
concrete. This in contrast to posttensioned
construction Where permanent anchors are
provided at the ends of the prestressing tendons.
The length of the tendO
Reference
Design for Torsion by MacGregor &
Ghoneim, ACI Structural Journal, Vol
92, No 2 pp. 211218, MarApr 1995.
Torsion Requirements
Portland Cement Association
Pearson figures from text
2
1
Need for torsional
design
Av + t @ s
Torsion arises becau
CES 6726 PROJECT # 1
FALL 2016
DUE: 8/31/16
SITUATION
Buildings are designed to support vertical and lateral (horizontal) loads, e.g. wind or
seismic. They are defined in ASCE 710 (Minimum design loads for Buildings and Other
Structures). Design requires
DEVELOPMENT LENGTH
As for reinforced concrete, the tension in the
prestressing steel needed for achieving nominal
exural strength Mn must be developed by
embedment or end anchorage.
Thus, the steel stress must. increase from fse to
fps. For this, an addit
USF
UNIVERSITY OF SOUTH FLORIDA
COLLEGE OF CIVIL & ENVIRONMENTAL ENGINEERING
Big Beam Contest 2014
Team #2
Team Members:
Faculty Advisor:
Daniel Buidens, E.I.
Brittany Dugan, E.I.
Ryan Feigel
Zuly Garcia
Cory Hill, E.I.
Thomas Meagher
Dr. Rajan Sen, P.E.
CES 5715
PRESTRESSED CONCRETE
ASSIGNMENT # 1
Due: January 13 2015
Problem # 1
A simply supported beam 30 ft long is prestressed by a straight tendon that carries
an effective force of 233 kips. The rectangular beam is 10 in. wide and 20 in. deep
and the e
CES 5715 PRESTRESS CONCRETE
ASSIGNMENT # 3
DUE January 27, 2015
Problem 1 (from Naaman 2nd Edition Problem 4.1)
A plain concrete beam 12 x 18 inches in cross section supports in addition to its own weight a
uniform live load of 100 plf on a simple span of
CES 5715 PRESTRESS CONCRETE
ASSIGNMENT # 2
DUE JANUARY 20, 2015
1.
For the prestressed concrete beam shown below, compute the stress distribution in the
crosssection at midspan due to prestress, dead load of beam and an uniform live load of
2k/ft using:
CES 5715
Assignment 8

3/08/2011

David Bissessar
Problem 6.1 Naaman: Shear stress in Tbeam
Stresses
Axial stress
Shear stress
.
x := 700psi
.
:= 400psi
a) Obtain the magnitude of the vertical prestress in order to have a principle tension stress of
Liana Fortuna
Alexey Fortuna
HW 7; Problem 4.6
03/10/2015
Problem 4.6
A foot bridge essentially uses a simply supported standard precast pretensioned double T
concrete beam in its inverted position, to be obtained from local supplier. Typical cross
sectio
CES 6726 HW # 5
Fall 2016
Due 9/28/16
Please try the following problem
73 Part a
Notes
Design the spandrel beam between columns B1 and C1 only. Note the beam
spacing is 12 ft (e.g. beam mnop). Correct calculation of the design load for the
spandrel beam
Transportation Safety (TTE 6315.901S17)
Spring 2017 Monday 5:00PM7:45PM CMC108
Text Book:
None (Handouts will be posted.)
Instructor:
Zhenyu Wang, Ph.D., Office: CUT 120
Tel.: 8139748998, Email: [email protected]
Office hours: Stop by or by appointme
CES 6726 HW # 1
Fall 2016
Due: 8/31/16
1.
A precast T beam is to be used as a bridge over a small roadway.
Concrete dimensions are b=48 in., bw = 16 in., hf= 5 in., and h= 25 in. The
effective depth d = 20 in. Concrete and steel strengths are 6000 psi and
FC1
0.739093
2.0940353628
Exp()
Medium > Low
L
95% Interval
EXP()
95% confidence interval
H
0.2185165
1.2442295462
Medium > Low
[1.24, 3.52]
1.259669
3.524254766
FC3
0.3653378
1.441000696
Medium > High
L
0.526515
0.5906598365
Medium > High
[0.59, 2.1
CES 6726
Advanced Reinforced Concrete Design
Room ENC 1000
Fall 2016
INSTRUCTOR:
Dr. Rajan Sen, P.E.
Professor and Jefferson Science Fellow
Department of Civil and Environmental Engineering
University of South Florida
Office and Office Hours
ENG 41
Teleph
The Reorganized
ACI 31814 Code
Are you ready?
The Reorganized ACI 318 14 Code
 Are You Ready?
Neal S. Anderson, P.E., S.E.
Staff Consultant
Simpson Gumpertz & Heger, Chicago, Illinois
[email protected]
Member ACI 318 Structural Concrete Bldg. Code,
Cha