Questions and answers of basic principles of steel structure

One 、 Completion （ Every empty 1 branch , common 20 branch ） 1、 China's current code for design of steel structures （ Except fatigue ） Based on probability theory Design method .

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2、 Structural safety 、 Applicability 、 Durability is generally called structural . 3、 Building steel may occur under load and Two forms of destruction . 4、 The yield index of steel under complex stress is . 5、 When selecting steel , For the load-bearing structure, the steel shall have 、 、 And carbon 、 sulfur 、 Qualified assurance of phosphorus content . The welded structure should also have Certificate of conformity .

6、 The cold working process of steel will make the plasticity of steel 、 Reduced toughness , Increased strength , This phenomenon is called .

7、 The bolt connection of steel structure can be divided into 、 、 .

8、 The buckling forms of axial compression members include 、 、 .

9、 The local stability of I-section beam flange is controlled by Guarantee .

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Two 、 choice question （ Every little question 2 branch , common 20 branch ）

1、 The impact test of steel is to inspect steel （ ） Indicators of .

A、 Strength B、 plasticity C、 Metallurgical quality D、 toughness

2、 In large-span roof structures , Steel structure is adopted because it has （ ） Characteristics .

A、 Homogeneous isotropic body B、 Light weight and high strength

C、 Synopsis 、 Good toughness D、 Solderability 、 Good heat resistance

3、 Among the factors that affect the properties of steel , most important of all （ ）.

A、 Steel hardens B、 Structural defects C、 Chemical composition D、 Metallurgical defects

4、 Among the influencing factors of steel properties , If （ ） The content of is too high , Will cause the material to produce thermal embrittlement .

A、Mn B、S C、P D、Si

5、 The influence of welding residual stress on components （ ） No influence .

A、 Overall stability B、 Low temperature cold crisp C、 Fatigue strength D、 Static strength

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6、 Bolt connection shown in the figure ,（ ） Bolts are the most dangerous bolts .

A、 Top left B、 The lower left

C、 The upper right D、 The lower right

7、 Bolt connection is in shear work , Such as τ-δ The end point of the straight line on the curve is regarded as the bearing capacity limit of the connection , Then the bolt should be （ ）

A、 Friction type high-strength bolt and ordinary bolt B、 Pressure bearing high-strength bolt and friction high-strength bolt

C、 Ordinary bolt and pressure bearing high-strength bolt D、 Friction type high strength bolt

8、 The main reason why the critical force of the actual pressure bar is lower than that of the ideal pressure bar ,（ ） It has the greatest influence on the critical force of the axial compression bar .

A、 Initial deflection B、 Initial eccentricity C、 Section form D、 Residual stress

9、 Ideal axial compression bar with biaxial symmetric section hinged at both ends , May occur under axial pressure （ ）.

A、 Bending and torsion B、 Bending and twisting C、 Twist and twist D、 Only bending

10、 When designing lattice batten columns under axial compression , The strength of steel and weld strength should be reduced to consider （ ）.

A、 Effect of shear force B、 Influence of welding defects

C、 The influence of structure D、 Influence of eccentric connection on one side

3、 ... and 、 Short answer （ Each question 10 branch , common 20 branch ）

1. Describe the requirements that steel for steel structure should meet and the factors that should be considered when selecting steel .

2. This paper describes the design steps of lattice axial compression column shoe beam column foot （ Including the main formula ）, And draw a diagram .

Four 、 Calculation questions （ The first 1、2 topic 10 branch , The first 3 topic 20 branch , common 40 branch ）

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One 、 Completion （ Every empty 1 branch , common 20 branch ）

1、 Limit state ;

2、 reliability ;

3、 Plastic failure 、 Brittle failure ;

4、 Reduced stress ;

5、 Tensile strength 、 Elongation 、 yield strength , Cold bending test ;

6、 Cold work hardening （ Or strain hardening ）;

7、 Tensile type 、 Shear type 、 Tension shear type ;

8、 Bending buckling 、 Torsional buckling 、 Flexural torsional buckling ;

9、 Width thickness ratio ;

10、 Equivalent moment coefficient 、 Resistance moment determined according to the tension flange 、

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Two 、 choice question （ Each question 2 branch , common 20 branch ）

1、D 2、B 3、C 4、B 5、D

6、C 7、D 8、D 9、A 10、D

3、 ... and 、 Narrative question （ Each question 10 branch , common 20 branch ）

1、 explain ： Expand each point appropriately to 2 Five points are enough ; If the answer is confused , Appropriate points can be given ;

Requirements to be met ： Steel for steel structure should have high tensile strength and yield strength in performance 、 Good plasticity 、 High toughness 、 Good process performance and the ability to resist the adverse effects of special environment ;

Factors to consider ： The importance of structure should be considered when selecting steel 、 Type of load 、 The temperature of the environment 、 Factors such as the method of connection and the thickness of the plate to be used .

2、 explain ： The schematic diagram is basically correct 3 branch ; Correct design idea , And the calculation formula corresponding to the drawn plinth form is correct , to 5 branch ; In other cases, points will be given as appropriate ;

General train of thought ：

① Determine the size of the base plate according to the pressure （ wide 、 Long 、 thick ）;

② Determine the size of the boot beam （ high 、 thick 、 Long ）

③ Determine the partition ;

④ Connection weld design .

Four 、 Calculation questions （ The first 1、2 Each topic is 10 branch , The first 3 Little topic 20 branch , common 40 branch ）

1、（ explain ： If the idea of this question is correct, you can get 5 about ）

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