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349 HB Exam 2
Chapter 11 Building Structure
Question | Answer |
---|---|
Roof | purpose is to prevent penetration of water and natural elements |
Flat roofs or built up roofs | moisture barrier laid down as a base, insulation is then added, then covered with a surface layer (ballast) |
Ballast | helps reduce ultraviolet light damage, provides weight to keep the protective layer and insulation in place, and provide a degree of fire protection |
Single ply roofing | membrane is placed on the roof in large sections and then hot sealed or glued together |
Load bearing wall | a wall of a structure bears the weight and force of some or all of the structure resting upon it |
structural frame | skeleton of the building |
Dead load | weight of the building |
Live load | weight of people, equipment, and furnishings |
natural load | loads imposed by nature.. earthquakes, hurricanes etc |
Cable Elevators | car moves up and down with the help of the motor, cables, and counterweights |
Hydraulic Elevators | car is mounted on top of a giant piston inside a cylinder at the bottom of the shaft. pump forces fluid into the cylinder, displacing the piston and causing the elevator car to rise |
Concrete crazing | fine, hairline cracks caused by shrinkage |
concrete leaching | caused by frequent water migration |
freezing and thawing of concrete | repeated freezing and thawing can cause progressive cracking and damage |
Sheet flow | uniform flow of water across a surface (Can cause erosion) |
open channel flow | water directed into a defined channel or ditch |
gray water | comes from selected areas of the property, water is clarified to remove solids and disinfected through chlorination or by way of ultraviolet light |