STRUCTURAL DESIGN Flashcards
The primary reason for using pinned connection is:
a. to allow relatively free end rotation of connection members
b. to make the analysis simpler
c. to allow for better load distribution
d. all of the above
All of the above
The rectangular section of width b and depth d has a plastic section modulus Z equal bd2/4. The shape
factor Z/S in the plastic design is equal to:
1.5
The maximum usable strain at the extreme concrete compression fiber shall be assumed to be equal to:
0.003
At any section of a concrete flexural member where positive reinforcement is required by analysis, the ratio
rho provided shall not be less than that given by:
rho (min) = 1.0/Fy
A quarter-sawed lumber is preferred for best finished flooring because:
it has the greatest strength
A 2” x 4” x 1’ lumber is:
2/3 bd. ft.
The relationship between the extension of a spring and the force required to produce the extension is:
F = kx
To prevent local buckling, AISC specifies the value of this ratio not to exceed a certain value, e.g., 76√fy
where fy is in ksi:
NOTA
The slenderness ratio, KL/r of compression members shall not exceed:
200
In a long column (slenderness ratio > 160) which of the following has the greatest influence on its tendency
to buckle under a compressive load?
length of column
Flexural members will overall depth to clear span of ratios greater than 2/5 for continous spans, 4/5 simple
spans, is known as and should be designed as:
deep beams
The area of the shear diagram between any two points on the beam is equal to:
change in moment between the two points
The capacity reduction factor for an axial compression member with or without bending with spiral
reinforcement is:
0.70
According to ACI-318, the minimum thickness of a solid one-way slab simply supported member not likely to
be damaged by large deflection is:
1/20
The maximum size of aggregate in a reinforced concrete mixture should not be larger than its amount of the
clear space distance between reinforcing bars:
3/4
ES, EF, LS, LF, total float, forward pass, backward pass, critical depth, parallel activity and slack are what terms in a PERT/CPM? a. some of the above b. all of the above c. none of the above d. half of the above
all of the above
A punching strength test correlation between a standard base and a given soil:
California Bearing Ratio (CBR)
The components (or scalar components) Fx and Fy of a force F in the Cartesian x and y directions where F is at an angle theta from the x-axis are:
Fx = F cos(theta) and Fy = F sin(theta)
The minimum thickness of non-prestressed beams unless deflections are computed if cantilevered is:
L/8
In structural steel, the maximum slenderness ratio KL/r for lateral bracing and secondary members shall not
exceed:
300
A long slender column of constant cross section is fixed at each end and subject to axial compression. The
load Pcr that will cause buckling is:
4Pi 2 EI/L 2
The elastic reaction of a subgrade to a plate load test:
Modulus of Subgrade Reaction
LFRD or Load Resistance Factor Design
a. is a method of designing structures so that no applicable limit state is exceeded when the structure is
subjected to all appropriate combination of factored loads.
b. uses a different factor for each type of load and another factor for the strength or resistance.
c. all of the list
d. makes uniform reliability possible because the different factors reflect the degree of uncertainty of the
all of the list
One Newton is equal to:
0.2248 lb.
One MPa is equivalent to:
1 MN/m
A wall of sheet piling of either steel timber or reinforced concrete restrained at the bottom by the soil and at
the top by a whale tied to a deadman or pile anchor:
Quay Wall
The allowable stress in structural steel in bending of compact section is:
0.66 fy
A column of gravel or sand punched through less previous material to permit water to bleed off:
Sand drain
The allowable stress in structural steel in tension is:
0.60 fy
The degree to which a location is subject to earthquake risk, usually refers to the frequency to occurrence
and magnitude of past earthquake and expectations of future seismic activity:
Seismicity
Honey comb in concrete can be limited by the :
use of vibrator
The ultimate or critical depth of the vertical depth of a vertical cut Hc that can be made in clay like soil with
a solid density g and unconfined compressive strength qu is given by:
Hc = 2qu/g
The maximum response, such a maximum displacement, maximum velocity or maximum acceleration, of a
single degree of freedom system to a type of ground motion when plotted as a function of period or frequency is
known as:
Response spectra
In the field of cohesive soil implace can be penetrated by the thumb with moderate effort. The consistency
and stiffness of the soil is:
Medium
The maximum deflection of a simply supported beam of length L with modulus of elasticity E and moment
of inertia I when subjected to a uniform load w is:
5wl 4 /(384 EI)
a gigapascal GPa is equivalent to:
10 over 9 Pa
The following are types of welding inspection:
a. radiographic and ultrasound inspection
b. penetrant inspection
c. magnetic particle inspection
d. all of the above
all of the above
The area of shrinkage and temperature reinforcement in terms of the reinforcement area to gross concrete
area shall not be less than:
0.0014
The following are pre-stress losses except: a. Fatigue and Fracture b. Creep and Shrinkage c. Anchorage Slip and Stress Relaxation D. Elastic and Duct friction
Fatigue and Fracture
The method of mechanical prestressing a hereby concrete is cast a round the prestressing tendons which
have been previously tensioned against external abutments. When the tendons which have been released from this external restrains, they are contact elastically and force the hardened concrete, which is bonded firmly to the steel into compression:
Full prestressing
The equivalent spring constant K for a vibrating system with two springs having spring constant K 1 and K 2
respectively in parallel is:
K = K 1 + K 2
It is a system of slab construction in which there are no beams or other projections below the bottom
surface of the slab:
Flat slab
It is a method of designing prestressed beams where the prestress eccentricity is chosen to provide upward
equivalent load that is equal and opposite of the given downward loads. This method is known as:
Load Balancing
The coefficient of expansion of structural steel per degree centigrade
11.25 x 10 -6
This principle states that, id during an increment of time the variation of the kinetic and potential energy of
the system is added to the variation of the work done by the non-conservative forces acting on the system, then
the sum of these scalar quantities must be zero:
Hamilton’s principle
Unit weight of concrete is:
23.56kN/m
The location of the maximum shear stress in a structural steel rolled section is at:
web neutral axis
In dynamic analysis, an equation whose roots are the natural frequencies is called the:
Characteristic equation
Fixed ended beams, both ends are fixed has a _______ degree of indeterminancy:
3
Minimum concrete cover requirement to protect the tendons and reinforcing bars depends on:
Fire resistance and exposure conditions
A simple beam with elastic constants EI and length L supports a machine foundation at midspan.
Neglecting the weight of the beam, the stiffness coefficient of the beam in a dynamic analysis is equal to:
48 EI/L 3
The connected chain or chains of critical activities or zero float activities, extending from the beginning of
the project to the end of the project, whose summed activity duration give the minimum project duration:
Critical path
The establishment of safe working practices and conditions of the projects, the communication of these
safety requirements to all project personnel, the maintenance of safety records, and the enforcement of these
requirements is a function of construction engineering and is known as:
Project safety
This is the force which acts on a mass of one gram that produces an acceleration of one centimeter per
second square:
Dyne
The general relationship between stress and strain is frequently referred to as:
Constitutive relation
The strength reduction factor for reinforced concrete member under flexure, without axial loads is:
0.90
The soil is said to be non-plastic if the liquid limit is less than:
20
According to the Implementing Rules and Regulations of P.D. 1594, which of the following is not authorized
to be a member of the PBAC:
Representative of Road Engineers Association of the Philippines
It is the magnitude of the energy released:
Magnitude of an earthquake
The following are welding process
a. SMAW shielded metal arc welding
b. GMAW gas metal arc welding
c. SAW submerged arc welding
d. All in the list
All in the list
