The thickness of tilt-up wall panels is obviously related to the magnitude of stresses caused in them due to the loads on the panels. Two types of stresses are caused in panels: (i) the stresses caused by gravity loads and lateral loads after the building has been constructed, i.e., in-service loads and (ii) stresses caused during the lifting and erection of panels. Which of these two stresses
determines the panel thickness and why?
What will be an ideal response?
The stresses in panels caused during lifting determines the thickness of panels. This ensures that the concrete in a
panel will not crack during the lifting operation, as the cracks reduce the panel's durability by allowing water to
penetrate into the panel, which causes freeze -thaw deterioration of panels.
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At room temperature, the stable crystal structure of iron is bcc. However, above 1183 K it becomes fcc. The iron fcc crystal structure is able to dissolve a much larger concentration of carbon than is the bcc structure. A primary reason for this is believed to be, that while the fcc structure is more close packed, the octahedral sites in the fcc lattice are much larger than the sites occupied by the carbon atoms in the bcc structure. The hole at the center of the fcc unit cell is such a site. See Fig. 1A. The minimum opening in one of these sites corresponds to the distance between atoms along a <100> direction. Note: that this is the same type of site as in the bcc case. Compare the fcc opening with that of the bcc lattice. For the sake of convenience, assume that the iron atom
diameter is the same as that of the bcc atom at room temperature. What will be an ideal response?
Which of the following is used primarily for two-way voice communication rather than entertainment?
A. Wideband FM B. Guard bands C. Narrowband FM (NBFM) systems D. Specialized mobile radios (SMRs)
Today many PM systems are maintained through paperwork only.
Answer the following statement true (T) or false (F)
What are some of the features of today's engine analyzer systems?
What will be an ideal response?