Find the require concrete dimension prestressed force

Assignment Help Civil Engineering

Reference no: EM13546664

A pretentioned beam is to carry a superimposed dead load of 600 plf and service live load of 1,200 plf on a 55ft simple span. A symmetrical I-beam with b = 0.5h will be used. Flange thickness hf= 0.2h and web width bw=0.4. The member will be prestress using graded 270 strand. Time dependant losses are estimate at 20% of Pi. Normal density concrete will be used with f'c = 5000 psi and f'ci = 3000psi. Question

a) Using straight strands, find the require concrete dimension, prestressed force , and eccentricity. select an appropriate number and size of tendons, and show by a sketch their placement in the section.

B) revised the design of part (A) using tendon deflected at the third point of span, with eccentricity reduce to zero at the support.

C) comment on your results. in both cases, ACI stress limit are to be apply, you may assume that deflection are not critical, and that a tensile stress of 12*f'c^0.5 is permissible at full service loads.

Reference no: EM13546664

Questions Cloud

Just barely support the mans full weight without snapping : A 96 kg man walks along a 50 kg horizontal plank which is 4 m long. The plank is attached to a hinge mounted to one wall, and the far end is supported by a vertical wire which is attached to an anchor in the ceiling. The wire can just barely support ..

Determine the required mass of block a so that when it is : Determine the required mass of block A so that when it is released from rest it moves the 5-kg block B a distance of .75m up along the smooth inclined plane in t=2s. Neglect the mass of the pulleys and cords.

Find the value of the spring stiffness constant and mass : A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. Find the value of the spring stiffness constant and mass

A vertical solid steel post of diameter : A vertical solid steel post of diameter = 21and length = 2.90 is required to support a load of mass = 8300 . You can ignore the weight of the post. Take free fall acceleration to be . 1) What is the stress in the post? 2) What is the strain in the po..

Find the require concrete dimension prestressed force : Comment on your results. in both cases, ACI stress limit are to be apply, you may assume that deflection are not critical, and that a tensile stress of 12*f'c^0.5 is permissible at full service loads.

Find the final velocities of the ball : A 2.50-kg ball, moving to the right at a velocity of +3.83 m/s on a frictionless table, collides head-on with a stationary 8.10-kg ball. Find the final velocities of (a) the 2.50-kg ball and of (b) the 8.10-kg ball if the collision is elastic. (c) Fi..

Estimate the maximum velocity attained by the object : An object with mass 3.0kg is attached to a spring with spring stiffness constant k=280N/m and is executing simple harmonic motion. Calculate the maximum velocity attained by the object

Determine the angle formed by the pipes : Section AB of a pipeline lies in th eyz plane and forms an angle of 37 degrees with the z axis. Branch lines CD and EF join AB as shown. Determine the angle formed by the pipes.

How did your calculations compare to your expectations : In the Experiment, you calculated the ratios of the measured distances, i.e. the ratios of Effort Distance/Load Distance. How did your calculations compare to your expectations

User Account

All Pages