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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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3. A new material is being developed and tested in the lab. The column was made using the new material and was loaded to a constant axial stress of 25 MPa. The deformation is monitored over time according to the following table. The deformation is measured over a length of 250 mm. First sketch strain-time curve and describe the model. Second, determine the elastic modulus and the viscose coefficient. Time (days) Stress (MPa) Deformation (mm) 25 0.6250 1 25 0.6281 25 0.6313 3. 25 0.6344 7 25 0.6469 28 25 0.7125 180 25 1.1875 365 25 1.7656
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A cylindrical block of concrete is 300mm long and has a circular cross section of 100mm in diameter. It carries a total compressive load of 67KN and under this load contract 0.2mm. Estimate the compressive stress and strain .
Calculate the corresponding depth of uniform stress block in a reinforced concrete beam 50*10 deep reinforced with bars 20-mm in diameter enclosed with 10-mm-dia stirrups when the tensile steel strain is 0.008 and concrete compeession strain is 0.003. f’c = 20 MPa express your answer in 2 decimal places only in mm
Problem 4a. You test a concrete cylinder having a diameter of 6.00 in and a gauge length of 12 in by applying compression forces. The results of your test are reported in the table as load vs. contraction. Draw, by hand on engineering paper, a stress-strain diagram using scales of: 1 in. = 0.5 ksi lin. = 0.2 x 10" g in. From the dingram, determine approximately the Modulus of Elasticity. Load (kip) Contraction (in) 0.0 0.0000 5.0 0.0006 9.5 0.0012 16.5 0.0020 20.5 0.0026 25.5 0.0034 30.0 0.0040 34.5 0.0045 38.5 0.0050 46.5 0.0062 50.0 0.0070 53.0 0.0075
A concrete cylinder sample has a diameter of 6 inches and a height of 12 inches. The maximum load carried by the sample after its failure is 500 KN. Determine the compressive strength of the sample in psi. (use 1lbf = 4.45 N, round-up your answer to the nearest whole number that is divisible by 5, no need for unit)
Drow the shear and bending diagram
Strain profiles of a flexural reinforced concrete element section at yield and failure conditions are given in Figure 1. (a) Does this section satisfy the curvature ductility requirement of µ ≥ 8. (b) Briefly indicate two possible design modifications by which the ductility of a reinforced concrete section can be improved. Ey Yield &c = 0.002 Øy Eu = 0.004 pu Es = 10ɛy Failure Figure 1: Strain Profiles fy = 460 MPa Es = 200 GPa
Describe suction in stress path analysis.
You are assigned to monitor the concrete strength gain at a construction site. The ultimate compressive strength of the concrete at its full maturity is 450 kg/m. The average concrete temperature at the construction site is 25 °C during the day and 15 °C during the night (assuming 12-hour day/night cycles). If you assume that the datum temperature (To) is - 10 °C, estimate the strength of concrete after 14 days. (4=35, B=51)Maturity Index, M = E(T - To).
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Answer only when know..exactly otherwise skip it please 6 6 . Explain the significance of creep in concrete structures. How is creep measured and what factors influence it ?