Calculate the load and stress

Reference no: EM131033722

Assignment 1 - Multistory Shoring

Your project calls for construction of a 6 story building that is 75' x 150'. The building will be constructed with multi story cast in place construction using 2 sets of shores and one set of reshores. The slabs are 8 inch thick and the weight of concrete is 150 pcf. Calculate load in the shores, reshores and slabs at the following intervals.

1. On the 2nd level, at the point when the slab has been poured.
2. On the 4th level, at the point when the slab has been poured.
3. On the 5th level, at the point when the slab has been poured.
4. On the 6th level, at the point when the slab has been poured.
5. On the 6th level after the slab has set up.

For each of the above, calculate the load and stress in each of the reshores assuming that 6 x 6 wood reshores are to be placed on a grid that is 25 feet on centers.

Assignment 2 -

Problem No. 1 - A piece of ¾ inch thick Hem-fir is to be attached to diagonally braced with a 4 x 4 S4S Southern Pine shore side face. Using ASD, and assuming that 2 wood screws will be used, what size screws should be used?

Problem No. 2 - Using the same facts as in Problem No. 1, instead of wood screws, nails are to be used. How many and what size nails should be used?

Problem No. 3 - Assume a 15 foot tall column is to placed at a rate of 15 ft/h. The concrete has a density of 150 pcf and a slump of 5 inches. The ambient temperature is 65 degrees, no internal retarders and internal vibration is provided every 3 feet. What pressure will be placed on the forms?

Problem No. 4 - A 20 foot wall form is to be filled with concrete in an hour and a half. The concrete weighs 150 pcf and is Type 1 cement with a 4 inch slump. Internal Vibration will occur at 4 foot intervals. The work will take place in June so that the ambient temperature is 72 degrees F. What is the load on the forms?

Problem No. 5 - Assuming the same wall form as in Problem No. 4, the basic wind speed for the project will 50 mph, Exposure Category B and the form will not be located at the top of a hill. The construction period will be 4 weeks. What is the load on the forms?

Assignment 3 - Wall Form Design

Problem 1 - Using ASD, design the forms for a 12 foot high concrete foundation wall. The concrete to be used is normal weight concrete, no pozzolans or set retarding admixtures. The wall will be constructed during July in New Jersey so that the temperature of the concrete will be 75 degrees and the slump will be 3 inches. The foundation of the structure is 25' by 75' and the contractor expects to finish the pour in 1 working day (8 hours). Vibration will be used.

The forms will be constructed from ¾ in Class I BB Plyform sheathing and framing lumber of S4S No. 2 Doug Fir will be used as needed. Deflection of the sheathing and the studs is limited to L/360 or 1/16 in. The forms are being reused from a previous project and will be reused after this project.

Problem 2 - What will be the effect on your design if the concrete that is delivered has an actual slump of 2 inches instead of the specified 3 inches?

Problem 3 - What will be the effect on your design if the concrete that is delivered has an actual slump of 5 inches instead of the specified 3 inches?

Problem 4 - What will be the effect on your design if the contractor's forces work a little quicker than normal and manage to finish the total pour in 6 hours?

Problem 5 - What will be the effect on your design if the contractor's forces work a little quicker than normal and manage to finish the total pour in 6 hours and the slump is 5 inches rather than the specified 3 inches?

Assignment 4 -

Problem No. 1 - Design the forms to support a 6inch thick flat plate concrete floor. The forms will Doug fir S4S framing members and steel shoring units. Ceiling height is 10 feet and the bays are 20 ft. by 20 feet. Shoring towers with 5 ft. spacing are available. The work will be done on an interior and w3ill not require wet service. Deflection of the sheathing is limited to 1/16 in or L/360. Unit weight of the concrete is 145 pcf.

Problem 2 - Using the information in Problem 1, a 12 inch wide beam is to be incorporated as part of the slab. The beam will be 12 inches wide and 18 inches deep. You may refer to the sketch in Example 7.6a, page 7-28 of the text, for reference.

Problem 3 - An 18 inch square column is to be constructed to a height of 15 feet. The schedule calls for 2 of these columns to be completed in 3 hours. The work will be done inside the structure and will be done with concrete of a unit weight of 150 pcf. Sheathing will be done with ¾ inch B-B class I plywood supported by S4S 2x6's of Doug fir. Used flat and clamped with metal clamps. Design the forms.

Problem No. 4 - Assume that there is a design change in the columns in Problem 3 from 18" square to 18" round. Design the forms.

Reference no: EM131033722

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