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COSC 421 Final Exam 167 questions all
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The requirements for the building foundation will most likely be found on which sheet in a drawing set? - ANSWER-S Construction Documents = Drawings + Construction Contract + ....... - ANSWER- Specifications The General Notes sheets are generally located at the beginning of the sheet set. - ANSWER-True All of the following effect the magnitude of wind loads on buildings except. - ANSWER- Weight of the building Earthquake induced forces is an example of gravity loading on a structure. - ANSWER- False Per the International Building Code, a fire station is required to be designed as what Risk Category? - ANSWER-IV The exposure category (wind design) for Francis Hall is most nearly.... - ANSWER- Exposure B A structure design to the minimum requirements of the building code should not collapse when subjected to a minimum design earthquake or wind event. - ANSWER- True A structure designed and constructed to the minimum requirements of the building should should not sustain structural damage during a design earthquake or wind event.
- ANSWER-False Earthquake forces are a function of the building mass (weight) and stiffness, which means that if a building is located in a high seismic region it is preferable for the building to be heavy and stiff in order reduce earthquake loads on the structure. - ANSWER- False Assuming that the Authority Having Jurisdiction has not amended the wind criteria of IBC 2015 (which incorporates ASCE 7-10) what is the minimum design wind speed for a Risk Category II structure located in Miami, Florida? (Hint use the ATC online tool or the wind maps in Ch. 16 of the IBC (Fig. 1609.3)) - ANSWER-170 MPH
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Wind loads increase the higher up from ground surface they are, since their is a reduction is friction with the ground. - ANSWER-True Un-reinforced concrete is a ductile material. - ANSWER-False half moon depicts which type of free body diagram condition - ANSWER-simply- supported beam with a uniformly distributed load Given the same cross-section, loading condition and span....a steel beam will deflect less than an aluminum beam. - ANSWER-True Given the same cross-section, loading conditions and span....steel with a yield strength of 36 ksi will deflect more than steel with a yield strength of 50 ksi. - ANSWER-False (yield strength does not help for deflection) The strength reduction factor for a concrete section controlled by flexure is 0.9 where for compression it is 0.75, what is best explanation for the reason between the different factors. - ANSWER-A concrete member that fails via flexure will provide greater warning signs of the overload than if it fails by shear. Per ACI 318, what is the thinnest section allowed for a cantilevering non-prestressed beam that is spanning 10'? - ANSWER-15" Reinforcement covers dictated by structural drawings are minimums and can be increased at the contractor's options without detrimental effects? - ANSWER-False The reason for ACI 318 specifying minimum tension reinforcement in concrete flexural members can best be described as. - ANSWER-To guarantee that the flexural strength of the reinforced member is larger than the uncracked concrete section, since if not, when the beam approached it's failure load, there would not be warning signs of the impending failure. The reason for ACI 318 specifying maximum tension reinforcement ratios can best described as. - ANSWER-To ensure that the members fails via tension in the reinforcement, a ductile failure mode in lieu of crushing of the concrete which is not a ductile failure mode. On a simply-supported beam with uniformly distributed loading, the shear is greatest at - ANSWER-at the supports Steel shear reinforcement (stirrups) is required in all concrete flexural members regardless of the member type, demand and shear capacity of the concrete. - ANSWER-False
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Per the IBC, special inspection of the formwork for concrete construction is required to be continuous - ANSWER-False Per the IBC, SPECIAL inspections are required on every concrete project that requires a commercial permit regardless of size - ANSWER-False Per the IBC, inspections are required on every concrete project that requires a commercial permit regardless of size - ANSWER-True Once a contractor has received notification that he has passed inspection, the contractor is now relived from the obligation to adhere to the documents - ANSWER- False Per the IBC, formwork is only required to inspected periodically, however per the specs 03 30 00 Cast in place concrete, formwork is required to be inspected continuously - ANSWER-True The reason for ACI 318 specifying maximum aggregate size in concrete mix design is most nearly - ANSWER-to facilitate placement of concrete around the reinforcement without honeycombing due to blockage how should concrete be selected for testing? - ANSWER-Random basis Concrete should not be poured in temperatures less than? - ANSWER-40 degrees Unreinforced concrete has a tensile strength roughly half that of the compressive strength. - ANSWER-false All other items being equal, a mix with lower w/c ratio will lead to a stronger mix that one with a higher w/c ratio. - ANSWER-True Air entrainment is added to concrete to increase its workability and compressive strength. - ANSWER-False Which of the following concrete finishes is not recommended for a concrete mix with a high amount of air entrainment (4-6%). - ANSWER-Hard Steel Trowel Finish The purpose of control joints is to? - ANSWER-to force the slab to crack in specified places (control joints) that are placed in a neat and organized manner. Per ACI 360R the recommend maximum control joint spacing for an 8" thick concrete slab-on-grade with typical concrete is most nearly... - ANSWER-17' FT
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A Simpson Titen HD anchor is an example of what type of anchor (hint, you will need to use the Internet to look into this one) - ANSWER-Screw Anchor The development length for a straight #4 bar is less than the development length of a hooked #11 bar (both bars are cast into concrete with an f'c of 4,000 psi) - ANSWER- False Placement drawings are required on all cast-in-place concrete project per ACI. - ANSWER-False The best location to splice the top bar of a beam that has uniform gravity loading is at the mid-span. - ANSWER-Ture A prestressed concrete double-tee is an example of a post tensioned member. - ANSWER-Fasle At which stage in the life of a prestress member is the prestress force the highest and the concrete compressive strength the lowest? - ANSWER-Transfer The following are examples of prestress losses in pre-tensioned members except. - ANSWER-Wobble The eccentricity "e" of a prestressed members can best be described as: - ANSWER- The distance between the center of gravity of the tendons and the neutral axis of the member. The purpose of draping the tendons in a post-tensioned slab is... - ANSWER-to balance stresses from gravity loading? Concrete is strong in tension but weak in compression. - ANSWER-False Elastic shortening of concrete is an example of a prestress loss that occurs immediately. - ANSWER-True In reviewing section 5/RP-04 of the placement submittal, which of the following items below is missing per detail 7/SF511? - ANSWER-Smooth bar dowels at the cold joint. The total length of bar 4A53 is most nearly.... - ANSWER-48" In reviewing section B/RP-04 of the placement submittal, which of the following items below is missing per detail 12/SF511? - ANSWER-Missing dowels at the cold joint The typical length of the slab reinforcement bars is most nearly... - ANSWER-40"
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The detail shown below is depicting a load bearing CMU wall. - ANSWER-False The CMU wall pictured is a load bearing wall. - ANSWER-True The CMU wall pictured below is not a load bearing wall. - ANSWER-False Given a wall that is 16' tall and has an opening that is 10'-0" wide, which cell should the first scheduled vertical reinforcing bar be located in? - ANSWER-E Which level of quality assurance program is required for a hospital with masonry that has been engineered? - ANSWER-Level C For a CMU project that requires Level B quality assurance, when does the f'm have to be verified? - ANSWER-Prior to construction For reinforced CMU lintels designed per Allowable Stress Design (ASD), if using 60 KSI reinforcement, the allowable tensile stress in the reinforcement is most nearly... - ANSWER-32 ksi For a concrete lintel, which option will increase the flexural capacity the greatest? - ANSWER-Double the depth to the steel reinforcement from the compression face The lap splice length for a single #6 vertical bar in an 8" CMU wall is most nearly.... - ANSWER-51" Given a wall that is 16' tall and has an opening that is 10'-0" wide, which cell should the first scheduled vertical reinforcing bar be located in? - ANSWER-E Which of the structural steel lateral load resisting systems shown below is a chevron braced frame? (triangles) - ANSWER-B Given the braced frame and lateral load shown below and ignoring the effects of all other loads including self-weight of the frame, which members will be in tension? (Select all that apply) - ANSWER-A (the one being pulled apart) Utilizing rules of thumb for steel beams, the depth of a non-composite, wide-flange floor beam with relation to it span for a beam with a 36' span is most nearly... - ANSWER- W21x Utilizing rules of thumb for steel beams, the weight of a W24 non-composite, wide- flange floor beam with a 40' span and a maximum moment of 575 k-ft is most nearly... - ANSWER-not W24x
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Which of the steel cross sections below is most likely to have a non-compact flange? - ANSWER-B (thicker middle support 90 deg angles) The picture below most nearly indicates that the beam failed via web crippling. (small red beam) - ANSWER-False Using Table 3-6 (slide notes) from AISC 360, the maximum spacing for lateral bracing of a W18x50 roof beam to preclude lateral torsional buckling is most nearly.... - ANSWER-5.83' The design effective length factor (K) for a moment frame with a pinned base is most nearly.... - ANSWER-not 1 The steel deck shown below is a composite deck. - ANSWER-true A square HSS tube floor beam can not fail via lateral torsional buckling. - ANSWER-true What is the maximum unbraced length for a W18x50 steel beam per Table 3-6 of the AISC Steel Manual to preclude lateral torsional buckling (Hint Lp)? - ANSWER-5. Which of the steel beam sections is most likely to fail via web local buckling/crippling? - ANSWER-C (thinnest middle support 90 deg angles) Structural steel is a ductile material. - ANSWER-True The preferred ASTM material specification for wide flange sections is.... - ANSWER- A The preferred ASTM material specification for steel angles is.... - ANSWER-A What level of surface preparation is required for structural steel that it to be galvanized?
- ANSWER-not SP The reason for placing an anchor plate at the bottom of a anchor is most nearly... - ANSWER-To increase the bearing surface and hence the concrete wedge which resist concrete breakout when the anchor rod is in tension. Direct tension indicators such as twist off bolts and squirting washers are required for all bolt that are to be installed snug-tight. - ANSWER-false Bolts specified to be installed as slip critical, rely on friction between the two connected plies in lieu of bolt bearing. - ANSWER-false Member A in the detail below is called a... - ANSWER-Gusset Plate
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For an exterior load bearing CFS wall with 800S200-54 studs @ 16" oc that requires bracing at third-points, "clip and bridging" bracing is the preferred method. - ANSWER- False The vertical members on each side of an opening are called .... - ANSWER-jambs The condition shown below is indicative of a load bearing wall stud connected to the structure above. (tiny connection) - ANSWER-False Web stiffeners are often required on joists to preclude web buckling. - ANSWER-True The most common fastener used to connect CFS to CFS is.... - ANSWER-metal screws Welding of CFS members to structural steel is not allowed since CFS members are too thin. - ANSWER-False Due its lighter nature and greater strength cold-formed steel framing is generally cheaper than wood framing on 4 story buildings. - ANSWER-False A stud section that is 800S250-54 is what depth web? - ANSWER-8" A stud section that is 600S162-43 is what thickness - ANSWER-18ga The structural members that run full height from the bottom plate to the top plate on the sides of an opening are called.... - ANSWER-king studs In an opening in a load bearing wall, the gravity load is transferred to the bottom plate primarily through the.... - ANSWER-jack studs The nail configuration shown below is a face-nail. (through the top of top plate into stud)
- ANSWER-false Per the Typical Fastening Schedule, when fastening the top plate to a stud how many, what type and what configuration of nails are required - ANSWER-(3) - 0.131"X3" end nails The advantages of wood include the following, select all that apply. - ANSWER- renewable, high strength to weight ratio and does not require high skill labor The selection of timber framing for the natatorium roof was driven by which of the following factors (select all that apply) - ANSWER-1. Wood is not susceptible to the high level of chemicals in the air that are corrosive to steel.
- Heavy timber framing is aesthetically pleasing.
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The tall buildings (above 5 stories) constructed out of wood primarily use which type of wood assembly? - ANSWER-not DL Hardwood species such as white oak have a high density and thus high structural strength which is why they are the most common species used for modern building construction. - ANSWER-False In a gable roof that is stick framed, it is structurally preferred to span the ceiling joists parallel with the rafters. - ANSWER-True An LVL members consists of multiple 2x members that are glued together to form one composite member. - ANSWER-False The actual dimensions of a 2x8 are 1½"x7¼". - ANSWER-True A common species of wood that is regularly used in wood framing that has a reddish tint is most nearly... - ANSWER-Douglas fir The maximum moisture content of wood members to be used in framing is most nearly... - ANSWER-19% The most common application of wood framing is in Type V construction. - ANSWER- True No.3 grade lumber is structurally superior to No.1. - ANSWER-False Retaining walls can fail gloablly via overturning, soil bearing failure and.... - ANSWER- Sliding The leaning Tower of Pisa is an extreme example of differential settlement. - ANSWER- True Of the major soil types, which is has the smallest particle size. - ANSWER-Clay Frost depth is a phenomena in which the soil either gains or loses moisture which in turn leads to expansive or subsidence in the volume of the soil. - ANSWER-False In general, based on the Thonrwaite Moisture Index and Expansive Clay Map of Central and East Texas, the soil San Antonio is more expansive than in Bryan/College Station. - ANSWER-False The condition shown below in which the soil around the perimeter of the foundation is pushing up on the foundation edges is called heave. - ANSWER-True
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- Locating the bell below the depth of seasonal moisture variation so that the bottom of the bell does not get pushed up or subside during wet or dry spells, respectively, and so that the bell will anchor the shaft during heave spells. Driven piles are a popular choice for foundation near river or bodies of water since the construction of driven piles is not impeded by ground water. - ANSWER-True
