兰大结构力学春在线作业Lanzhoustructuralmechanics,springonlinehomework

1、兰大结构力学 13 春在线作业 4(Lanzhou structural mechanics,spring 13 online homework 4 )14 spring 13 autumn big orchid structural mechanics 13 spring online homework 4Total score: 100 test time: -Radio examinationJudgment questionRadio examination questions (20 questions, 60 points)1. The system with the same i

2、nternal force and displacement dynamic coefficient is calculated when the system (excluding the distribution mass of beam) is calculated in Figure 117A. homeworkanswer did not upload, first for everyone to review the use, if you need to answer the specific see my registration name to findB.C.D.Full

3、marks: 32. Figure 44. Reciprocal theorem of reciprocal reaction for two states of structure r12=r21, R12 and R21 are dimensionsA. forceB. dimensionlessC. force / dimensionD. length / forceFull marks: 33. commonly used structural types of bars include ()A. beam, arch, bent and so onB. beam, arch, rig

4、id frame, etc.C. beam, arch, suspension structure, etc.D. beam, rigid frame, suspension structure, etc.Full marks: 3axial4. figure 104 structure ABrod axial force is () excluding deformation, EI= constantA.B.C.D.Full marks: 35. Fig. 57 the influence line of the support reaction forceR in the beam is

5、 ()A.B.C.D.Full marks: 36., figure 43, the answer is not uploaded, first for everyoneto review the use, and if you need to answer the specific, look at my registration name, to find the cantilever beam, the cross section of the impact of the bending moment, the line shape is ()A.B.C.D.Full marks: 37

6、. figure 51 the bending moment of the section D in the frame is ()A.B.C.D.Full marks: 3The theoretical basis of the 8. displacement method is ()A. force methodB. Hookes lawThe C. determines the displacement and determines the correspondence between the internal forcesD. displacement reciprocal theor

7、emFull marks: 3 9. figure 56 truss, when the moving load P in the lower chord moves, axial force rod 54 is constant ()A. -PB. 0C. P/2D. PFull marks: 310., figure 124, which cannot apply the dynamic coefficient method to calculate the dynamic displacement amplitudeA.B.C.D.Full marks: 311., the physic

8、al meaning of T is ()A. vibration per secondB. the number of seconds needed to change the force of a weekThe number of vibrations in C. 2 sec secD. the number of seconds required for a week of vibrationFull marks: 312. figure 83 frame, EI= constant, the vertical displacement of the point B (down) (f

9、or)A.B.C.D.Full marks: 313., figure 5 belongs to ()A. geometric invariant system without redundant constraintsB. geometry transient systemC. geometric invariant system with redundant constraintsD. geometry variable system, but W 0Full marks: 3system the EI=.14. In Figure 118, the spring stiffness of

10、 the structure is k, and the mass of the beam is not equal to that of Then the natural frequency of the system is equal to (4)A.B.C.D.Full marks: 315. figure 83 frame, EI= constant, the vertical displacement of the point B (down) (for)A.B.C.D.Full marks: 316. the three hinged arches given in Figure

11、123 can not be calculated by formulaA.B.C.D.The answer was not uploaded,First for everyone to review the use, if you need to answer the specific, see my registration nameto get full marks: 3 points17. the free vibration of multi degree of freedom system is ()A. harmonic vibrationSuperposition of som

12、e simple harmonic vibrations of B.C. weak periodic vibrationD. is hard to pin downFull marks: 318. figure 94 the number of statically indeterminate is ()A. 5B. 6C. 7D. 8Full marks: 319. figure 48. The shape of the structure M diagram is () A.B.C.D.Full marks: 320. The natural vibration frequency of

13、the frame is shown as figure 115A.B.C.D.Full marks: 3 14 spring 13 autumn big orchid structural mechanics 13 springonline homework 4Total score: 100 test time: -Radio examinationJudgment questionJudgment questions (a total of 10 questions, a total of 40 points)1., Figure 12 belongs to the geometric

14、invariant systemA. errorB. correctFull marks: 4Marked effects of the influence line part of the 2. verticalline the basic structure of a section of the value part of zero loadA. errorB. correctFull marks: 43. Figure 84. The bending moment diagram of the ABC part of the structure is independent of th

15、e ratio of EI and EAA. errorB. correctFull marks: 44. in S line, said the abscissa P=1 mobile route; Shubiao said the size of the S value, when the painting in the painting in the baseline baseline side, negative sideA. errorB. correctFull marks: 45. the internal force influence lines of statically

16、determinate structure and statically indeterminate structure are composed of straight linesA. errorB. correctFull marks: 4The application of the 6. displacement method has nothing to do with the static and indeterminate structures, and the static structure can also be shifted.A. errorB. correctFull

17、marks: 47. A in Figure 96 is a symmetrical structure, and it is desirable to use the displacement method to solve the half edge structure, as shown in BA. errorB. correctFull marks: 48., under any load, only the static equilibrium equation can be used to determine all the reaction and internal force

18、s of the system is geometrically invariant system.A. errorB. correctFull marks: 49. systems with redundant constraints must be geometrically invariantA. errorB. correctFull marks: 4There are 10. asymptotic method of moment distribution method and shear distribution method, iterative method, which is a variant of the displacement method, the common feature is to avoid the composition and calculation of the typical equation, does not need to calculate the node displacement, but by the method of successive approximation to calculate the bending mom