Examination questions for postgraduate entrance examination in 2008
Discipline: structural engineering and disaster prevention and mitigation project number. : 8 16 project name: structural mechanics
Please note that the test questions should be answered on the special "answer sheet";
Answers made elsewhere will be considered invalid and will not be graded.
A, geometric composition analysis (10)
(1) Analyze the geometric composition of the graphic system. (5 points)
(2) Analyze the geometric composition attribute of graphic plane system. (5 points)
Second, the bending moment diagram of the graphic structure (this question 15)
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Discipline: structural engineering and disaster prevention and mitigation project number. : 8 16 project name: structural mechanics
Third, find the rotation angle and constant of the A section of the rigid frame as shown in the figure. (This is entitled 15 points)
Fourth, try to draw the influence line of the graphic structure, and find out the numerical value under the action of the graphic load position.
(This is entitled 15 points)
Five, the force method to calculate the graphic structure, and make a map. No change. (20 points for this question)
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Discipline: structural engineering and disaster prevention and mitigation project number. : 8 16 project name: structural mechanics
Calculate the graphic structure by displacement method and make its diagram. Constant of each rod. (20 points for this question)
Seven, use the moment distribution method to calculate the graphic structure and make its diagram. No change. (Calculate two rounds and take one decimal place) (20 points for this question)
Eight, graphic structure, regardless of axial deformation, angular displacement as an unknown, to find the stiffness matrix of the structure (20 points in this question).
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Discipline: structural engineering and disaster prevention and mitigation project number. : 8 16 project name: structural mechanics
Attachment: Element Stiffness Matrix:
Nine, find the natural frequency of the graphics system, regardless of the column weight, known constant. (This is entitled 15 points)
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Suzhou Institute of Technology
Examination questions for postgraduate entrance examination in 2009
Major: Structural Engineering and Disaster Prevention and Mitigation Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
Please note that the test questions should be answered on the special "answer sheet";
Answers made elsewhere will be considered invalid and will not be graded.
First of all, try to analyze the geometric composition of the graphics system. (This question 10)
(a)(5 points) (b)(5 points)
Second, draw the bending moment diagram of the illustrated structure.
(This is entitled 15 points)
Third, find the vertical displacement of the center point of the illustrated rigid frame. No change. (This is entitled 15 points)
Page 1 ***3
Major: Structural Engineering and Disaster Prevention and Mitigation Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
Fourthly, moving along the beam, try to make the influence line of graphic structure by static method. (This is entitled 15 points)
5. Calculate by force method and draw the bending moment diagram of the illustrated structure.
Constant,
(20 points for this question)
Six, use displacement method to calculate the graphic structure, and make the bending moment diagram.
(20 points for this question)
Seven, with the first processing method, write a picture.
Structural stiffness matrix, constant.
(20 points for this question)
Page 2 * * * Page 3 Specialty: Structural Engineering and Disaster Prevention and Mitigation Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
Attachment: Element Stiffness Matrix:
Eight, use the moment distribution method to calculate the graphic rigid frame and make a bending moment diagram.
No change. (20 points for this question)
Nine, let the influence of horizontal displacement of particles be ignored, and find the natural frequency of vertical vibration of graphics system, which is known.
(This is entitled 15 points)
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Suzhou Institute of Technology
20 10 postgraduate entrance examination questions
Major: Structural Engineering, Disaster Prevention and Mitigation Engineering and Protection Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
Please note that the test questions should be answered on the special "answer sheet";
Answers made elsewhere will be considered invalid and will not be graded.
First of all, try to analyze the geometric composition of the graphics system. (This question 10)
Second, draw the bending moment diagram of the illustrated structure. (This is entitled 15 points)
Page 1 *** 4
Major: Structural Engineering, Disaster Prevention and Mitigation Engineering and Protection Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
Thirdly, try to calculate the vertical displacement of point D of the graphic structure with known constants,,,,.
(This is entitled 15 points)
Fourth, try to draw the influence line of the graphic structure and find the value under the action of the graphic load position.
(This is entitled 15 points)
5. Calculate by force method and draw the bending moment diagram of the illustrated structure. (20 points for this question)
Page 2 * * * Page 4
Major: Structural Engineering, Disaster Prevention and Mitigation Engineering and Protection Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
6. Calculate the graphic structure by displacement method and make its bending moment diagram. Constant of each rod.
(20 points for this question)
Seven, use the moment distribution method to draw the bending moment diagram of the graphic beam, constant. (Count two rounds) (20 points for this question)
Eight, find the natural frequency of the graphics system, regardless of the weight of the column, known constant. (This is entitled 15 points)
Page 3 * * * Page 4
Major: Structural Engineering, Disaster Prevention and Mitigation Engineering and Protection Engineering Examination Subject: Structural Mechanics Subject Code: 8 16
Nine, graphic structure, regardless of axial deformation, angular displacement as an unknown quantity, find the stiffness matrix of the structure (20 points in this question).
Attachment: Element Stiffness Matrix:
Page 4 * * * Page 4
Basic contents and assessment requirements of structural mechanics
1. Basic contents and evaluation requirements
(1) Introduction
This paper introduces the task of structural mechanics course and its relationship with related courses, and grasps the structural calculation diagram and the classification of structure and load.
(2) Analysis of geometric composition of plane system.
Master the concepts of geometrically variable and geometrically invariant systems, the degree of freedom of the system, the basic rules of composing geometrically invariant systems, and the concept of transient systems, and understand the geometric composition characteristics of statically indeterminate structures and statically indeterminate structures.
Emphasis: geometric composition analysis of plane bar system; Difficulties: Flexible use of geometric composition rules to analyze the geometric composition properties of the system.
(3) statically determinate beam and statically determinate plane rigid frame
Familiar with the internal force calculation of single-span statically determinate beam, the composition and layered relationship diagram of multi-span statically determinate beam, the internal force analysis and internal force diagram of multi-span statically determinate beam. Familiar with the calculation of statically determinate plane rigid frame, drawing and checking of internal force diagram.
Key points: internal force calculation of statically determinate beam and statically determinate plane rigid frame, bending moment diagram by subsection superposition method; Difficulties: internal force calculation of statically determinate plane rigid frame.
(4) statically determinate three-hinged rigid frame and three-hinged arch
Understand the characteristics and classification of three-hinged rigid frame and three-hinged arch. Master the internal force calculation of three-hinged rigid frame and three-hinged arch and the concept of reasonable arch axis of three-hinged arch.
Emphasis: internal force calculation of statically determinate three-hinged rigid frame and three-hinged arch; Difficulties: internal force calculation of statically determinate three-hinged rigid frame.
(5) statically determinate plane truss and composite structure
Master the basic assumptions, characteristics, composition and classification of ideal truss. Master the node method and section method calculation of plane truss, and master the internal force calculation of statically indeterminate composite structure.
Key points: internal force calculation of statically determinate plane truss; Difficulties: internal force calculation of statically indeterminate composite structures.
(6) Displacement calculation of statically indeterminate structure
Master the concept of generalized displacement, the concepts of real work and virtual work, and the virtual work principle of deformation system. Familiar with unit load method and general formula of displacement calculation. Familiar with displacement under different structural loads. Master the displacement caused by bearing movement and temperature change. Grasp the displacement and reciprocity theorem of beam and rigid frame by graphic multiplication.
Key points: calculate the displacement of statically indeterminate structure by graph multiplication; Difficulties: calculation of graph multiplication and displacement of complex graphs, reciprocity theorem.
(VII) Influence line and its application
Master the concepts of moving load and influence line, and master the influence line of statically determinate structure by static method. Master the maneuver method of making statically determinate structure influence line. Master the application of influence line and the determination of the most unfavorable load position. Understand the internal force envelope diagram and absolute maximum bending moment calculation of simply supported beams.
Emphasis: the concept, drawing and application of influence line; Difficulties: the concept of influence line, and the calculation of influence line and absolute maximum bending moment by maneuver method.
(8) Force method
Familiar with the determination of statically indeterminate times, the basic principle, system, basic unknowns and typical equations of force method. Master the force calculation of statically indeterminate beams, rigid frames and bent frames, master the internal force calculation caused by the movement of statically indeterminate structural supports and temperature changes, and master the application of structural symmetry. Master the displacement calculation and internal force diagram of statically indeterminate structures.
Emphasis: the determination of statically indeterminate times and the basic principle of force method (the basic unknown quantity, basic system and typical equation of force method); Difficulties: the application of symmetry, the movement of support, and the calculation of force method when temperature changes.
(9) Replacement method
Master the basic principle of displacement method and the angular displacement equation of members with equal cross section. Skillfully master the displacement typical equation method to calculate statically indeterminate structures. Skillfully using displacement direct method to calculate statically indeterminate structure. Understand the shear distribution method to calculate the contour bent. Master the application of structural symmetry.
Emphasis: the angular displacement equation of members with equal cross-section and the basic principles of displacement method (basic unknowns, basic systems and typical equations of displacement method). Difficulties: the calculation method of symmetric semi-structure.
(10) torque distribution method
Master the basic concept and three elements of torque distribution method. Using moment distribution method skillfully to calculate continuous beams and rigid frames without lateral displacement. Understanding the influence line and envelope diagram of continuous beam by analogy.
Emphasis: the basic concept of moment distribution method, the calculation of moment distribution method for continuous beams and rigid frames without lateral displacement; Difficulties: Calculating rigid frame by moment distribution method.
(1 1) matrix displacement method
Master the principle of matrix displacement method, the formation of element stiffness matrix, the concept of coordinate transformation, the formation of element stiffness matrix in overall coordinates and the concept of equivalent load. Master the pretreatment method and form the total stiffness matrix of the structure. Using matrix displacement method skillfully to calculate the internal force diagram of continuous beam, truss and rigid frame.
Key points: The first method forms the total stiffness matrix and equivalent node load of the structure, and calculates the matrix displacement method of continuous beams, trusses and rigid frames; Difficulties: The first treatment method forms the total stiffness matrix of the structure and the formation of equivalent load.
(XII) Structural stability analysis
Master two concepts of stability and the critical pressure of different supporting compression bars. Proficiently use static method and energy method to analyze the critical pressure of different strut, and understand the stability of variable cross-section strut.
Key points: the critical pressure of compression bars with different supports is analyzed by static method and energy method; Difficulties: the critical pressure of instability is calculated by static method and energy method.
structural dynamics
Master the purpose of structural dynamic analysis, classification of dynamic loads, dynamic degrees of freedom and discrete methods. Master the concepts of vibration equation, free vibration and forced vibration, * * * vibration and Du Hammrl integral of single-degree-of-freedom system, and master the stiffness method and flexibility method of two-degree-of-freedom system and the approximate method for calculating the fundamental frequency of infinite-degree-of-freedom system.
Emphasis: the determination of dynamic degrees of freedom, the concepts of free vibration and forced vibration of single-degree-of-freedom system and * * * vibration; Difficulties: calculation of natural frequency of single-degree-of-freedom system, dynamic coefficient of forced vibration and dynamic response of forced vibration.
2. Textbooks and test questions
(1) Textbook: Course of Structural Mechanics Ⅰ and Ⅱ, Higher Education Press, edited by Long Yuqiu and Bao Shihua.
⑵ Test paper type: All test papers are calculation questions, with a total score of 150.