quiz 2 Flashcards
(29 cards)
It is the determination of the effects of loads on physical structures and their components
structural analysis
When a structure or structural element becomes unfit for its intended use, it is said to have reached a __________
All ( limit state, failure, ultimate strength)
A type of cement developed for mass concrete dams and other structures where heat of hydration is dissipated slowly
IV
The strength of concrete is affected by the strength of this material, its surface texture, its grading, and to a lesser extent, its maximum size
aggregates
A type of admixture that are used primarily to offset the accelerating and damaging effect of high temperature, to keep the concrete workable during the placement, and to minimize form deflection cracks.
retarding admixture
The modulus of elasticity for all non prestressed concrete steel (bars and wires) per ACI 20.2.2 is ________ MPa
200,000
It is the property of concrete by which it continues to deform with time under sustained loads at unit stresses
Creep
precipitated from the chimney gases of coal-fired power plants, frequently
leads to improved workability of the fresh concrete.
fly ash
precipitated from the chimney gases of coal-fired power plants, frequently
leads to improved workability of the fresh concrete.
fly ash
A failure would generally involve tipping or sliding of the entire structure and would occur if the reactions necessary for equilibrium could not be developed
loss of equilibrium
the normal weight of reinforce concrete is
2400 kg/m^3
generally heavy weight aggregate obtained form
mineral ores
The following are serviceability limits except:
fatigue
It is the design method in which the service loads are increased sufficiently by factors to obtain load at which failure is imminent
SDM
It has been used in the WSD to designate the ratio between between yield stress and the allowable working stress
safety factor
the linear portion of stress - strain diagram of steek is known as the:
elastic range
It refers to the concrete with special properties such as ease of placement and consolidation, high early age strength to allow early stripping of forms, durability and high strength
high performance concrete
It is the weight of the member itself, plus weight of all materials permanentl incorporated into the structure and supported by the member
dead load
Advantages of strength design method over of that working stress design
all of the above
Construction joints shall be made and located as not to impair the strength of the structure. Construction joints shall be located:
within the middle third of the spans of slabs, beams, and girders
According to the ACI code commentary, the tensile strength of normal weight concrete in flexure is about 10 to ____ % of the compressive strength
15
A material other than water, aggregates, and hydraulic cement that is used as an ingredient of concrete and is added in controlled amounts before adding or during mixing to prodice some desired modification to the properties of the concrete
admixture
According to the building codes, design of a structure to withstand the largest earthquake likely to occur that will prevent the collapse of the building to _____ the loss of life
prevent?
The distance between the reinforcement or rebar embedded in the concrete to the outer surface of the concrete as per ACI 130
25 mm?
