Engineering and Construction bridge design

Project description
please state how to calculate (Z) in question 1 and question 5

3- A 97953“ Dre-tensione
d beam 250
PFE-Stfessing force with 17omm eccemtn? Wide and 75omm deep of 1om span, subjected to 17ookN
Supporting a 2m wide and 25om d n ricity. Work out the stresses in the beam when it is

4oN/mmz. allowable compressive stfep Shh on-top carrying 5kN{m2′ use concrete grade of
and at Transfer too Lo55 ff. . esses’ max’m”’“ = 2oN/mm ; minimum = ON/mm’ in service
co
e icients (1 – 0.9 at transfer & fl = Q72 in Se,-V,ce_ [10]
4. Determine the stresses ‘ d
Shrinkage of the cast – ‘tin uced in the concrete prestressed concrete composite section due to
in
Strain of _ 2oox106. Th SlE:.I top slab based on the detail provided in figure below. Use shrinkage
e astic Modulus of precast concrete E“ is 42kN/mm’ and cast in-situ
concrete E“ is 3SkN/mm’. [25]
2oomm deep, 1.2m wide cast in situ slab rt.‘
1 I” . ‘7
l‘ ‘l ‘ -‘*2: .-‘:-3,.-3.:
i‘ I: vghectiow PROAEERTIES ~ mm
A wwwwm
5 lmmi immzi abovesofflmi mm Zn’ ) mm
W!
T ’ _ . _ Teriipeiature C=i§’.’~_:-;n;i;- :31;
5. Determine the stresses induced due to positive *F”°’C°““‘”“‘°“ W is _ V
-3 v‘.’.eti*L1;

temperature difference in the concrete steel

composite section based on the Deck section ___ 5; _ E M.

detail used in question 1&2. Use the appropriate

charts given beside. Please note Elastic Modulus ‘-!. i ‘<‘i’i‘i

of cast in-situ concrete E“ is 35kN/mmzas well as D _‘ Tr T

coefficient of thermal expansion is 1ox10’5. [25]

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