MOOC Fundamentals of Concrete Structures(Wuhan University)1461336169 最新慕课完整章节测试答案
Chapter 1 Introduction
文章目录
- Chapter 1 Introduction
- Chapter 10 Prestressed concrete members
- Chapter 2 Physical and mechanical properties of concrete and reinforcements
- Chapter 3 Basic principles for concrete structure calculation
- Chapter 4 Calculation of bearing capacity in the normal section of a flexural member
- Chapter 5 Shear strength of flexural members
- Chapter 6 Capacity of compression members
- Chapter 7 Calculation of bearing capacity of tensile members
- Chapter 8 Bearing capacity of torsional members
- Chapter 9 Performance and durability design of concrete structure
Quiz 1
1、单选题：
Compared with plain concrete, the bearing capacity of reinforced concrete beams is
选项：
A: the same
B: improved a lot
C: improved a little
D: unable to be identified
答案: 【 improved a lot】
2、单选题：
Compared with plain concrete beams, the ability of reinforced concrete beams to resist cracking is
选项：
A: improved a little
B: improved a lot
C: totally the same
D: None of the above
答案: 【 improved a little】
3、单选题：
Reinforced concrete beam is under normal service loads, and
选项：
A: it usually works with cracks
B: once the cracks appear, the crack is passing through to the total section
C: once the cracks appear, the bonding force between the concrete and the reinforcement along the full length is lost
D: it usually does not develop cracks
答案: 【 it usually works with cracks】
4、判断题：
Concrete and reinforcement have similar linear temperature expansion coefficient.
选项：
A: 正确
B: 错误
答案: 【 正确】
5、判断题：
Reinforced concrete beams work with cracks under normal load.
选项：
A: 正确
B: 错误
答案: 【 正确】
6、判断题：
China's current code for concrete Structural Design is 《Code for Design of Concrete Structures》（GB50010-2002）
选项：
A: 正确
B: 错误
答案: 【 错误】
Chapter 10 Prestressed concrete members
Quiz 10
1、单选题：
Compared with ordinary reinforced concrete, the advantages of prestressed concrete do not include
选项：
A: The stiffness of the component is increased
B: The anti-crack ability of the component is improved
C: The extension and deformation ability of the component is improved
D: Can be used for long span, heavy load members
答案: 【 The extension and deformation ability of the component is improved】
2、单选题：
For fully prestressed concrete under the service load, in the section of concrete member
选项：
A: Tensile stress is allowed to occur
B: No tensile stress occurs
C: Allow for cracks
D: There is no compressive stress
答案: 【 No tensile stress occurs】
3、单选题：
The concrete strength grade of prestressed concrete structures should not be lower than
选项：
A: C25
B: C30
C: C40
D: C45
答案: 【 C30】
4、单选题：
It is correct to describe the load and its ultimate load of prestressed concrete members when cracks appear
选项：
A: The cracking load is far less than the ultimate load
B: The cracking load is close to the ultimate load
C: Cracking load is equal to ultimate load
D: unable to be identified
答案: 【 The cracking load is close to the ultimate load】
5、单选题：
For pretensioned prestressed concrete members, the loss in concrete preloading (the first batch)
选项：
A: 
B: 
C: 
D: 
答案: 【 】
6、单选题：
For post-tensioning prestressed concrete members, the loss in concrete preloading (the first batch) is
选项：
A:
B:
C:
D:
答案: 【 】
7、单选题：
The loss of prestressing concrete members after the preloading of concrete (the second batch) is
选项：
A: 
B: 
C: 
D: 
答案: 【 】
8、单选题：
For post-tensioning prestressed concrete members, the loss after concrete preloading (the second batch) is
选项：
A:
B:
C:
D:
答案: 【 】
9、单选题：
Before relieve the constraints of the first batch of prestressed steel bars in the pretensioned prestressed concrete components, the following statement is correct, except
选项：
A: 
B: 
C: 
D: 
答案: 【 】
10、单选题：
When the first losses of post-tensioned prestressed concrete members are completed, the following statements are correct, except
选项：
A: 
B: 
C: 
D: 
答案: 【 】
11、判断题：
Post-tensioning is the process of casting concrete and hardening the prestressed reinforcement.
选项：
A: 正确
B: 错误
答案: 【 正确】
12、判断题：
In the process of pre-tensioning, the prestressed reinforcement can be cut off when the strength of the concrete is maintained to no less than 60% of the design value.
选项：
A: 正确
B: 错误
答案: 【 错误】
13、判断题：
Compared with the ordinary reinforced concrete members under the same condition, the crack load is increased, but not the ultimate load.
选项：
A: 正确
B: 错误
答案: 【 正确】
14、判断题：
Partial prestress means that the concrete section under load is not allowed to undertake tensile stress.
选项：
A: 正确
B: 错误
答案: 【 错误】
15、判断题：
In the heating curing of concrete, the loss of prestressing force caused by the difference in temperature between the tensile reinforcement and the tensile equipment only exists in the pretension component.
选项：
A: 正确
B: 错误
答案: 【 正确】
16、判断题：
The loss caused by the friction between the prestressed reinforcement and the tunnel wall can be reduced by the two ends tension and supertension
选项：
A: 正确
B: 错误
答案: 【 正确】
17、判断题：
There is an upper limit for tension control stress, but no lower limit.
选项：
A: 正确
B: 错误
答案: 【 错误】
18、判断题：
In order to ensure the reliability of prestressed concrete axial tension members, in addition to the calculation of bearing capacity and crack control, the calculation of bearing capacity in construction stage and the local pressure of concrete at the end of post-tensioning members should also be carried out.
选项：
A: 正确
B: 错误
答案: 【 正确】
19、判断题：
In order to reduce the loss of prestress, fewer pads should be used at the end of prestress concrete members.
选项：
A: 正确
B: 错误
答案: 【 正确】
20、判断题：
The formula for calculating the bearing capacity of normal section of prestressed flexural member is the same as that of ordinary reinforced concrete flexural member.
选项：
A: 正确
B: 错误
答案: 【 正确】
21、判断题：
Different from ordinary concrete flexural members, the deflection of prestressed concrete flexural members consists of two parts: the first part is the downward deflection caused by external load; The other part is the upward deformation caused by the prestress (reverse arch).
选项：
A: 正确
B: 错误
答案: 【 正确】
22、判断题：
Prestressed concrete members must not crack during normal use.
选项：
A: 正确
B: 错误
答案: 【 错误】
Chapter 2 Physical and mechanical properties of concrete and reinforcements
Quiz 2
1、单选题：
Strength grade of concrete is determined by
选项：
A: Characteristic cubic compressive strength.
B: Average cubic compressive strength.
C: Characteristic axial compressive strength.
D: Design value of axial compressive strength.
答案: 【 Characteristic cubic compressive strength.】
2、单选题：
Which one of the following statements is true?
选项：
A: The measured cubic compressive strength of concrete decreases with the increasing loading rate.
B: The measured compressive strength increases with the increasing aspect ratio of prism specimen.
C: The cube specimen can better reflect the actual compression situation of concrete rather than the prism specimen.
D: The friction between the concrete specimen and the base loading plate increases the compressive strength of the concrete.
答案: 【 The friction between the concrete specimen and the base loading plate increases the compressive strength of the concrete.】
3、单选题：
For the concrete of the same strength grade, the magnitude relationship between different strength is
选项：
A: 
B: 
C: 
D: 
答案: 【 】
4、单选题：
The characteristic cubic compressive strength of concrete is determined by
选项：
A: 
B: 
C: 
D: 
答案: 【 】
5、单选题：
Under a certain long-term load, concrete would creep. In the reinforced concrete axial compressive members:
选项：
A: Creep increases the compressive stress of concrete.
B: The compressive stress of concrete and steel bar keeps unchanged.
C: Creep decreases the compressive stress of concrete and increases the compressive stress of steel bar.
D: Creep increases the compressive stress of concrete and decreases the compressive stress of steel bar.
答案: 【 Creep decreases the compressive stress of concrete and increases the compressive stress of steel bar.】
6、单选题：
After the hot rolled steel bar subjected to cold stretching:
选项：
A: Tensile strength and compressive strength are improved.
B: Only tensile strength is improved.
C: Plasticity is improved and the strength does not increase much.
D: Only compressive strength is improved.
答案: 【 Only tensile strength is improved.】
7、单选题：
After the hot rolled steel bar subjected to cold drawing:
选项：
A: Tensile strength and compressive strength are improved.
B: Only tensile strength is improved.
C: Plasticity is improved and the strength does not increase much.
D: Only compressive strength is improved.
答案: 【 Tensile strength and compressive strength are improved.】
8、判断题：
The characteristic axial compressive strength is the basic representative value of various strength indexes of concrete.
选项：
A: 正确
B: 错误
答案: 【 错误】
9、判断题：
In the state of tri-axial compression, the compressive strength of concrete increases greatly and the ductility decreases obviously.
选项：
A: 正确
B: 错误
答案: 【 错误】
10、判断题：
The elastic modulus of concrete is greater than the deformation modulus.
选项：
A: 正确
B: 错误
答案: 【 错误】
11、判断题：
For concrete specimen subjected to uniaxial compression, the stress reaches the maximum when the strain reaches the ultimate compressive strain.
选项：
A: 正确
B: 错误
答案: 【 错误】
12、判断题：
The larger the size of the cube specimen, the higher the compressive strength.
选项：
A: 正确
B: 错误
答案: 【 错误】
Chapter 3 Basic principles for concrete structure calculation
Quiz 3
1、单选题：
S and R represent the load effect and resistance on the sections of members. If the structure or component sections are in the limit state, which relationship between S and R in the following is correct? ( ).
选项：
A: R>S
B: R=S
C: R<S
D: R<=S
答案: 【 R=S】
2、单选题：
The design reference period is the period selected to determine the variable loads and time-related material properties. The statistical parameters of loads considered in the "Uniform Standard for Reliability Design of Building Structures" are determined based on ( ).
选项：
A: 25 years
B: 50 years
C: C. 100 years
D: D. 75 years
答案: 【 50 years】
3、单选题：
Which of the following states should be checked as the normal service limit state. ( )
选项：
A: The structure is out of balance as a rigid body
B: Partial damage that affects the durability
C: Not suitable to continue to bear the load any more due to excessive plastic deformation
D: The component loses stability
答案: 【 Partial damage that affects the durability】
4、单选题：
The representative load values include the standard value, the combined value, the frequent value and the quasi-permanent values, which of the above values is the basic representative value of the load. ( )
选项：
A: Combined value
B: Quasi-permanent value
C: Frequent value
D: Standard value
答案: 【 Standard value】
5、单选题：
What shall be checked for all the reinforced concrete members? ( ).
选项：
A: Cracking resistance
B: Crack width
C: Deformation
D: Bearing capacity
答案: 【 Bearing capacity】
6、单选题：
Which of the following items is beyond the serviceability limit state. ( )
选项：
A: The steel bar of the axial tension member has reached the yield strength under the designed load
B: The crack width in the beam exceeds the limit regulated by "Code for Design of Concrete Structures" under the standard loads
C: The concrete under the crane rail pads is partially crushed
D: The component loses its stability
答案: 【 The crack width in the beam exceeds the limit regulated by "Code for Design of Concrete Structures" under the standard loads】
7、单选题：
For the design of the ultimate limit state, the load effect shall be calculated by ( )
选项：
A: Basic combination of loads and accidental combination of loads
B: Basic combination of loads and standard combination of loads
C: Accidental combination of loads and standard combination of loads
D: Standard combination of loads and quasi-permanent combination of loads
答案: 【 Basic combination of loads and accidental combination of loads】
8、单选题：
When designing the serviceability limit state, which kind of load combinations should be considered. ( )
选项：
A: Standard combination, frequent combination, and quasi-permanent combination
B: Basic combination, accidental combination, and quasi-permanent combination
C: Standard combination, basic combination, and quasi-permanent combination
D: Frequent combination, accidental combination, and quasi-permanent combination
答案: 【 Standard combination, frequent combination, and quasi-permanent combination】
9、单选题：
A certain batch of concrete specimens is selected as samples, the strength grade of which should be C30. This implies that ( ).
选项：
A: The guaranteed rate of the cube compressive strength standard value reaching 30 N/mm2 should be 95%
B: The average compressive strength of the cube should be 30 N/mm2
C: The guaranteed rate of the cube compressive strength reaching the standard value of 30 N/mm2 should be 5%
D: The guaranteed rate that the design value of the cubic compressive strength reaching 30 N/mm2 should be 95%
答案: 【 The guaranteed rate of the cube compressive strength standard value reaching 30 N/mm2 should be 95%】
10、单选题：
Which of the following statements is correct regarding the relationship between the reliability index (
) and the failure probability (
)? ( )
选项：
A: The bigger , the bigger