钢结构考试选择(Selection of steel structure examination).doc
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钢结构考试选择(Selection of steel structure examination)
The load calculation, design value and standard value of the steel structure, in which group is right? (C I, IV)
I. calculation of structure or component strength, stability and strength of the connection, the design value of load;
IV. calculation of deformation fatigue and serviceability limit state, the load standard value.
A cold area, 2 North (temperature lower than -20 DEG C) a weight of more than 50t of the open-air warehouse work for A4 crane girder, the steel should be selected (C Q235-C) steel.
3, directly affected by the welding structure of repeated loading, the main factors influencing the fatigue strength is (D stress cycles, the maximum stress and minimum stress algebraic difference (stress amplitude) and details)
4, the steel structure calculation formula of C section in plastic
5, when the beam with fixed concentrated load, the point should be set to support B stiffener.
6, the steel is fatigue damage (C brittle failure).
7, one of the main factors of the welding residual stress is C when welding heat distribution was uneven.
In 8, bear the static load, front fillet weld strength than side fillet weld strength of A high.
9, sometimes the requirements for steel should have Z shrinkage index requirements, in order to prevent the C plate in the thickness direction of welding or under tension, tearing.
10, the structure is directly subjected to dynamic loads, should be used (C friction type high strength bolt connection;).
1, the steel structure has a good seismic performance because (C steel good energy absorption capacity and ductility).
The design is based on the strength of 2 steel (C yield) to determine the.
4, the mechanical properties of steel, plastic and steel can reaction of metallurgical defects index is (C bending property).
5, there are two materials were members of Q235B steel and Q345B steel for welding by manual arc welding, welding rod should be used (A E43 type).
6, friction type high st
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