What is the relationship between the acceptance of the passenger elevator in the late 1870s and structural steel-frame construction?
What will be an ideal response?
After the passenger elevator was developed, taller buildings became more feasible. However, as buildings grew in height, loadbearing walls became excessively thick, making them uneconomical. Structural steel supports structures by means of a structural framework of beams and columns of minimum sizes, making possible longer spans and lighter weights. Exterior walls are no longer required to carry loads; the exterior facade could be a curtain wall of glass, brick, or insulated metal building panels, with the main function of protecting the interior of the building from outside elements, creating a clear distinction between the structural and nonstructural components of a building.
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An existing rural 4-lane highway is to be replaced by a 6-lane divided expressway (3 lanes in each direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first year of operation is 24,000 with the following vehicle mix and axle loads. The vehicle mix is expected to remain the same throughout the design life of 20 years, although traffic is expected to grow at a rate of 3.5 percent annually. Using the AASHTO design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years.
Passenger cars = 50 percent 2-axle single-unit trucks (12,000 lb/axle) = 40 percent 3-axle single-unit trucks (16,000 lb/axle) = 10 percent Pi = 4.5 J = 3.2 Pt = 2.5 Cd = 1.0 S'c = 650 lb/in2 So = 0.3 Ec = 5 × 106 lb/in2 R = 95% k = 130 lb/in3 What will be an ideal response?
Cross steer linkage is found on ____________
A) Sports cars B) Mid-size sedans C) Light trucks and vans D) None of these
Airplanes are the only flying vehicle that is used to spray and dust large acreage of crops
Indicate whether the statement is true or false
_____ is composed of small beads or pellets and can be poured into blocks upon completion of the wall or in stages as the courses are built.
A. Poured-in-place insulation B. Foam-in-place insulation C. Expanded polystyrene D. A molded insert