PDD Flashcards
Wood beam vs steel beam
Strength of beam shape is the ratio of how much the beam wants to smile to how much the bottom of the beam’s midpoint wants to pull apart
Section modulus = maximum bending moment/ bending stress
Bending stress of steel will always be less than bending stress of wood
Nominal vs actual wood dimensions
2-6” pieces reduce by 1/2
8 “+ reduce by 3/4
Proprietary specification
Identifies a single manufacturer - closed spec
Prescriptive specification
Instructs the bidder, in detail, how to build the railing
Performance specification
Leaves flexibility to contractor of methods, provided the railing performs properly
Expansion joint
General category of full- separation joints
Isolation joints
Expansion joints
Slip joints
Vertical full separation joints for walls
Construction joints
Full break between yesterdays concrete pour and todays
Contraction joints
1/4 “saw cut - crack control
Control joints
1/4” groove min for cracking
Increase in building size means what for electrical service?
Typically volts can stay the same, but we need an increase in amps (wire size) to support the needs
Steel column height
Typically can support 2 stories (next column is joined a few feet above floor slab )
Shear force in beam
Middle of beam - shear force of a simply supported beam at the middle is almost zero, so this is a good place to disturb it if you have to
Rim exit devices
Used for single door
Panic bar
Required for high occ. Load
Card reader
Install on lock side or outside the secured door
Surface mounted electric strike
Jamb mounted- works with the rim exit device for proper latching
Marine environment
Ocean spray acts as an electrolyte and can cause galvanic corrosion with aluminum and steel
Duct attenuator
Reduces sound transmission through ducts
Where does a vent go in a soil pipe that serves multiple fixtures?
Near the last fixture
Direct outside air system
Consistently provides high indoor air quality by separating ventilation requirements from heating and cooling demands
Elevator control - single automatic push button
Single family residential- handles one call at a time, providing an uninterrupted trip for each call
Elevator control- selective collective
4 story lab, 4 story apartment, department store - stores all calls until they are answered and automatically reverses the direction of travel at the highest and lowest calls - most common type
Elevator control- destination dispatch
High rise - optimization technique used for multi-elevator installations in which groups of passengers head to the same destinations using the same elevators, thereby reducing waiting and travel times
Supplementary conditions
Where owner specific items are located In the specs. Supplements or changes the general conditions of the contract. .
Requested alternates
In open proprietary specs with requested alternates, the arch can list b and c as alternates. Bidders will include both base bid (A) and prices for each alternate. No subs, allowed.
Construction documents estimate
Labor and material estimates
Passage latch
The latch bolt retracts by the lever on either side , doesn’t lock
Privacy lock
Outside is locked by an inside thumbturn/ turning the inside over or closing the door automatically unlocks the outside lever, if you are locked out, an emergency key can open it
Office or inner entry lock
A key outside or inside thumbturn locks / unlocks to the outside lever, inside lever automatically retracts latchbolt for eyres
Classroom lock
A key locks/ unlocks the room from the outside, the inside lever automatically retracts the latch bolt for egress
Classroom security lock
A key locks/unlocks the room from the outside and the key also locks unlocks the room from the inside, the inside lever automatically retracts the latchbolt for egress
Electrically locked (fall safe) hardware
The door is unlocked by aer outside, the outside lever is continuously locked by 24 volt AC or DC current, an electrical switch or power failure unlocks the door remotely, the inside lever automatically retracts the latch bolt for egress
Electrically unlocked ( fail safe)
The door is unlocked by a key outside, the outside lever is continuously locked but can also be unlocked by a 24 volt AC or DC current, an electrical switch unlocks the door remotely, but in a power failure, remains locked. Inside lever automatically retracts latch bolt for egret
Storeroom lock
The door is unlocked by a key outside, the outside lever is inoperative, the inside never automatically retracts latchbolt for egress
Incidental use (code)
A required space that takes up less than 10% of the floor area but is more hazardous to life safety than the occupancy it is in, so it still requires fire wall separation
Accessory use (code)
An additional space within an occupancy that is less hazardous and takes up less than 10% of overall floor area - check incident al use chart - no fire separation
Types of conduit
RMC - rigid metallic conduct - thicker, normally threaded
IMC - intermediate metal conduit - medium thickness -threaded
EMT - electric metallic tube conduit _ thinner and sometimes called “ thin wall” - too thin to be threaded. Used for smaller branch circuits and not designed for robust connections less expensive
GRC - galvanized rigid conduit - galvanized for corrosion resistance and thick enough to be threaded
Panic hardware
Allows lots of people to leave quickly when pushing against the bar on the door (no lever)required in A, E, an high hazard occupancies with an occupant load of 50 +
Fire stopping
All of the systems used to seal the small gaps and maintain the fire rating of the assembly
Fire safing
A type of fire stopping, it is fire-resistant mineral wool that can stuff a gap to maintain fire rating
Bending stress
How much the bottom of the beam center wants to split apart
Bending moment
How much the beam wants to “smile” when loaded
Section modulus
How strong is the shape of the beam
Modulus of elasticity
How strong is the beams material (steel, wood, reinforced concrete)
Ground fault circuit interrupters ( G F C I )
’ A receptacle or breaker and switches power Off in the presence of water - outdoors, laundry, garages, crawl spaces, basements, kitchens
Arc fault circuit interrupters ( Afci)
Switches the circuit off in the presence of static electricity - a billowing curtain, a nail through a wire, smashed prongs - required in residential any where there’s not a GFCI
Variable frequency drive ( VFD )
When we want to control the speed of a motor I this electronic allows the motor to be more versatile than an on/off
How wide is a corridor?
44” min
