春學(xué)期《混凝土及砌體結(jié)構(gòu)(一)》在線作業(yè)（ spring semester, concrete and masonry structuresonline work ）

1、13春學(xué)期混凝土及砌體結(jié)構(gòu)(一)在線作業(yè)3（13 spring semester, concrete and masonry structures (1) online work 3）Northeastern University, 14 spring, 13 autumn, 13 spring semester, coagulationNortheastern University, 14 spring, 13 autumn, 13 spring semester, concrete and masonry structure (1), online work, 3Total score:

2、100 test time: -Radio examinationRadio examinationRadio examination questions (15 questions, 75 points)1. when checking the limit state of the normal use of the structure, it adopts ()A. load design value and material strength design valueB. load design value and material strength standard valueC. l

3、oad standard value and material strength design valueD. load standard value and material strength standard valueFull marks: 52. when calculating the combined value of long-term load effect, the method of dealing with live load is ()A.Without considering the action of live loadB. considers design val

4、ues for some live loadsC. is included in the standard values of live loadsD. is included in the quasi permanent value of live loadsFull marks: 5ThreeA. AB. BC. CD. DFull marks: 54., under normal circumstances, the design of cast-in-place continuous beam section, ()The A. cross neutralization bearing

5、s are calculated by the T cross sectionThe B. cross neutralization bearings are calculated at rectangular cross sectionsC. midspan is calculated by T cross section, and the support is calculated at rectangular sectionD. the midspan is calculated by the rectangular section, and the supports are calcu

6、lated by the T cross sectionFull marks: 55. the capacity of reinforced concrete beams to resist cracking compared to plain concrete beams.A. doesn't improve muchB. improves a lotC. is exactly the sameD. is uncertainFull marks: 56. when the block strength grade is higher and the strength grade of

7、 mortar is lower, the possible failure form of masonry is ()A.Destroy the dentiform sectionB. is destroyed along the section of the block and vertical seamC. breaks along the through seam sectionD. three kinds of damage are possibleFull marks: 5SevenA. there is too much pressure on the reinforcement

8、B. there is too little compression steel reinforcementWhen the C. beam breaks, the compressive bar has already yieldedD. section size is too largeFull marks: 58., the overall cast in place rib beam in the cover of a one-way plate, the central area of the bending moment can be reduced by 20%, mainly

9、to consider ()The arching action existing in A. platesThe B. board has higher safety and can be reducedThe live load on the C. board is less likely to be coveredThe load on the plate of the D. is actually part of the long and lateral directionFull marks: 5The 9. MR diagram must be wrapped with a M d

10、iagram to guarantee the beam.A. homework answer did not upload, first for everyone to review the use, if you need to answer the specific see my registration name to findFlexural capacity of normal sectionFlexural capacity of B. oblique sectionC. shear resistance capacity of inclined sectionFlexural

11、bearing capacity of D. positive and oblique sectionFull marks: 510. in the calculation of the normal section bearing capacity of the T section beam, it is assumed that the compressive stress distribution of the concrete in the width of the flange of the compression zone is assumed to be ().A. unifor

12、m distributionB. is parabolicC. is distributed in a trianglePart D. is even and partly unevenly distributedFull marks: 511., our Code stipulates that the standard design period for general structures is ()A. 30 yearsB. 50 yearsC. 80 yearsD. 100 yearsFull marks: 512. compared with plain concrete beam

13、s, the capacity and resistance to cracking of steel reinforced concrete beams with adequate reinforcement.A. has improved a lotB. has much higher bearing capacity and little increase in cracking resistanceC. has much higher crack resistance and little increase in bearing capacityD. has not increased

14、 muchFull marks: 5ThirteenA. AB. BC. CD. DFull marks: 5Flexural capacity of 14. eccentric members ().A. increases with the increase of axial forceB. increases with the decrease of axial forceThe C. bias increases with the increase of axial forceThe D. increases with the increase of axial force at hi

15、gh biasFull marks: 5FifteenFor the loss of prestress caused by stress relaxation of steel bars, the following statement is wrong: ().A. stress relaxation is related to timeThe stress relaxation of B. is related to the variety of reinforcementC. stress relaxation and tension stress in the size of the

16、 homework answer does not upload, first for your review, if you need to answer the specific look at my name to find, tension control stress is larger, the smaller the relaxationD. over tension can reduce the prestressing loss due to stress relaxationFull marks: 5Northeastern University, 14 spring, 1

17、3 autumn, 13 spring semester, concrete and masonry structure (1), online work, 3Total score: 100 test time: -Radio examinationRadio examinationRadio examination questions (5 questions, 25 points)1. a column of spiral stirrups with circular section is calculated according to the ordinary reinforced c

18、oncrete column, and its bearing capacity is 300KN. If the carrying capacity of the column is calculated to be 500KN according to the spiral stirrup column, the bearing capacity of the column should be shown as ().A. 400KNB. 300KNC. 500KND. 450KNFull marks: 52. in the normal section bearing capacity

19、of flexural members, the T shape section is divided into two types, and the cross section is based on ().The basic principles of establishing a A. formula are differentThe section shape of B. tension zone is different from that of compression zoneC. damage patterns are differentD. the shape of the c

20、ompression zone of concrete is differentFull marks: 5ThreeA. AB. BC. CD. DFull marks: 54. the one-way slab in the whole floor of the ribbed floor, the bending moment of the grid plate in the middle section can be reduced by 20%, mainly due to ()The arching action of A. plateThe load on the plate of the B. is actually part of the long and lateral direc