Exam (elaborations)
EXAC - Section 3 - Final Project Questions Graded A+
- Course
- Institution
EXAC - Section 3 - Final Project
[Show more]
Content preview
EXAC - Section 3 - Final ProjectWhat is: Design wind pressure? - answer Design wind pressure:
Minimum design value for the equivalent static pressure on the exterior surfaces
resulting from critical wind velocity (equal to a reference wind wind pressure measured
at 33', 10m). The # is modified by a bunch of coefficients to account for: exposure
conditions, building height, wind gusts, geometry/orientation.
Why are horizontal forces more critical than vertical ones in seismic design? - answer
Because structures usually have considerable reserve for dealing with additional vertical
loads.
Define Base Shear. - answer Base shear:
Minimum design value for the total lateral seismic force (assumed to act in any
horizontal direction)
Define the following: Collinear Forces, Concurrent Forces, Nonconcurrent Forces. -
answer Collinear Forces:
Occur along straight line. Vector sum= sum of magnitude of forces acting along same
line of action.
Concurrent Forces:
Lines of action intersecting at common point. Vector sum=equivalent to, and produces
same effect on rigid body as the application of the vectors of the several forces.
Nonconcurrent Forces:
Lines of action that do not intersect at common point. Vector sum=single force that
would cause the same translation and rotation of a body as the set of original forces.
What is a moment (structural forces)? - answerMoment:
The tendency of a force to produce rotation of a body about a point or line
What is a Couple (structural forces)? - answerCouple:
Force system of 2 equal parallel forces acting in opposite directions tending to produce
rotation but not translation
What are beams designed to do? - answerDesigned to carry and transfer transverse
loads across to supporting elements.
Define Deflection - answerDeflection:
perp distance a spanning member deviates from true course under transverse loading
,What is the difference between a simple beam and a Fixed-End Beam? - answerSimple
Beam:
Rests on supports at both ends - no moment resistance (ends free to rotate)
Fixed-end beam:
Both ends fixed against translation and rotation (reduced max deflection, transferred
bending stresses, increased rigidity)
Distinguish between the following three frame types:
-Fixed Frame
-Hinged Frame
-Three Hinged Frame - answerFixed Frame
rigid frame connected to its supports with fixed joints (more resistant to deflection than
hinged from but also more sensitive to settlements and thermal expansion/contraction)
Hinged Frame -
Rigid frame connected to its joints with pinned connections (pinned connections prevent
high bending stresses by allowing rotation)
Three-hinged Frame - structural assembly of 2 rigid sections connected to each other
and to its supports with pin joints (more sensitive to deflection than fixed or hinged, 3-
hinged system is least affected by support settlements and thermal stresses - can also
be analyzed as a statically determinate structure
Name 1 kind of beam for each wood, steel, and concrete, that can span >60' (18m). -
answerWood:
Laminated Beams (Timber)
Trusses (Timber)
Steel:
OWSJ
Concrete:
Precast Tees
List three basic mechanisms for resisting lateral loads. - answerRigid Frame
steel or reinforced concrete with rigid joints
Shear Wall
wood/concrete/masonry - resist changes of shape and transfer cert loads to ground
foundation
Braced Frame - timber or steel
Knee brace
K-brace
Cross-brace
, What is the least effective way to achieve lateral stability? - answerRigid frame (only
appropriate in low-mid rise buildings)
What do vents and traps do in relation to plumbing design? - answerVents permit septic
gases to escape and prevent siphonage and backpressure
Traps - seal sewer gases from escaping the fixture
What is the difference between a soil stack and a waste stack? - answerSoil stack (vert
pipe) for urinals and WC's
Waste stack (vert pipe) from plumbing fixtures other than urinals or WC's
List considerations in specifying and designing HVAC systems: - answerPerformance -
technical and cost efficiency (capital and operating costs)
Fuel/Power source - regional availability and efficiency
Flexibility - to meet various demands throughout building
Noise and Vibration - relating to programmatic requirements
Space Consumption - how much room is req
Building size and configuration
What is the intent of Fire Protection Systems? - answerIntent is to protect building from
fire and contain fire long enough for safe evacuation of occupants, and long enough for
firefighters to respond
Why are Wet-Pipe sprinkler systems the most common? - answereasy to design,
easy to install,
easy to maintain,
cost less due to simplicity and design mechanics
Describe the 2 common types of elevators. - answerElectric:
Car mounted on side guide rails, lifted with hoisting cables, driven by electric hoisting
machinery in penthouse.
Geared traction elevs are medium speed and typically used in med-rise buildings
Gearless traction = high speed (up to 1,200 feet/min, or 6m/s) used for high rises
Hydraulic:
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Dreamer252. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $19.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
85169 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now