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1、西南交混凝土结构设计原理在线作业一（Southwest China, principles of concrete structure design online homework）Southwest China, principles of concrete structure design online homeworkTotal score: 100 test time: -Radio examinationA multiple-choice questionJudgment questionRadio examination questions (4 questions, 20 poi
2、nts)1., the main reason for deflection of flexural members under long-term load is ()Creep and shrinkage of A. concreteB. slip between the steel bar and its surrounding concreteC. crack width increasesNo compression reinforcement is used in the D. memberFull marks: 52., it is possible to increase th
3、e stirrup ratio of the beam properlyA. can significantly increase the cracking load of inclined cracksB. prevents the occurrence of baroclinic failureC. significantly improved the shear capacityD. transforms the baroclinic failure into shear pressure failureFull marks: 53. of the 4 groups of interna
4、l forces subjected to a large eccentric compression column with symmetrical reinforcement, the most unfavorable group of internal forces are ()A., M=251kN*m, N=900kNB., M=251kN*m, N=300kNC., M=260kN*m, N=300kND., M=-251kN*m, N=505kNFull marks: 5In the 4. part, the failure of reinforced reinforced co
5、ncrete members under torsion is classifiedA. ductile failureB. compressive brittle fractureC. tensile brittle failureD. has a certain ductilityFull marks: 5Southwest China, principles of concrete structure design online homeworkTotal score: 100 test time: -Radio examinationA multiple-choice question
6、Judgment question, (a total of 8 multiple-choice questions, a total of 40 points.)Is the 1. eccentric compression member a brittle failure and what are the following factors?Calculated length of A. componentB. initial offsetC. material strengthD. longitudinal reinforcementFull marks: 52. compared wi
7、th the initial loading, the flexural member continues with the duration of the external loadA. deflection increasedB. deflection decreasesC. stiffness B (also known as long-term stiffness BL) decreasesD. short-term stiffness RS decreasesFull marks: 53. reinforced concrete axial tension member, ()Whe
8、n the A. crack occurs, the steel bar is subjected to tensile stress, i.e., the yield stress is reachedThe stress increment of steel bars before and after cracking of B. is related to the reinforcement ratioThe tensile stress of the steel bar is still low before the C. crackD. crack occurs before the
9、 moment, the steel stress is independent of the reinforcement ratioFull marks: 5The 4. axial compression member is always equipped with the right amount of longitudinal compression reinforcement, including the following reasonsA. longitudinal bars are used to accommodate possible bending stresses (a
10、lmost none of the members really only carry axle load)A portion of the total load of the B. is assumed to be reduced by a much higher strength than the concrete, which reduces the sectional dimension of the memberC. simplifies formulasD. can reduce material cost and improve economic efficiencyFull m
11、arks: 55., increasing the reinforcement ratio of the reinforced beam can be achieved by PA. significantly increased the cracking moment McrB. increase the flexural strength of the normal section of beam MuC. increase ductility of flexural cross section of beamD. reduces ductility of flexural cross s
12、ection of beamsFull marks: 5Flexural capacity of normal section of 6. reinforced beam MU and ().A. concrete strength relatedThe reinforcement strength of B. is related to yC. concrete strength and reinforcement strength are relatedD. section size relatedFull marks: 5The failure of the 7. beam belong
13、s to brittle fractureA. beam with few tendonsB. beam with suitable reinforcementC. super reinforced beamD. double reinforced beamFull marks: 58. structural reliability refers to the ability of a structure to complete a predetermined function within a given time and under specified conditions. At pre
14、sent, the requirements of the structure and function of the specification can be summarized as followsA. securityB. applicabilityC. durabilityD. economyFull marks: 5Southwest China, principles of concrete structure design online homeworkTotal score: 100 test time: -Radio examinationA multiple-choice
15、 questionJudgment questionJudgment questions (a total of 8 questions, a total of 40 points)1., two axial compression columns, A is the correct configuration of stirrups ordinary stirrups column, B for other conditions, and A the same configuration of the column of spiral reinforcement. When compared
16、 with A column and B column, the ductility of B is better than that of A. ()A. errorB. correctFull marks: 52. the prestressed concrete beam will invert upwards when the prestressing force is acting initially. As time goes on, the prestress loss will lead to the decrease of prestress, so the upward d
17、eflection of the beam under the pre stress will decrease with time.A. errorB. correctFull marks: 53. ordinary reinforced concrete members are not suitable for excessive strength steel bars.A. errorB. correctFull marks: 54., the probability of accidental occurrence is very small, and the probability
18、of persistence is very short, so the harm to the structure is also very small.A. errorB. correctFull marks: 55. the larger the cube size of concrete, the higher the compressive strength of the measurementA. errorB. correctFull marks: 56. reasonable design of prestressed reinforced prestressed concre
19、te beam and the location of the prestress value, can effectively reduce the work load and even cause the offset of the tensile stress, avoid cracking, so called as cracking calculation of prestressed beam.A. errorB. correctFull marks: 5The failure characteristics of the 7. beams are related to the a
20、ctual load valueA. errorB. correctFull marks: 58. reduce the thickness of the concrete protective layer C, and the maximum crack width Wmax of the tensile area of the flexural member decreases. Therefore, the smaller the thickness of the concrete protection layer, the less likely the corrosion of the reinforcement is, the better the structural durability of the C.A. errorB. correctFull marks: 5This article reprinted from the free operating answer Download Network www.Vu80. com more full marks free answer