《钢结构的基本原理》

1钢材拉伸试件的应力和强度这两个概念是否同一？
2影响钢材强度和塑性指标的主要因素有哪些？
3伸长率是如何定义的？
4为什么钢结构设计规范对钢材有伸长率的要求？
5若某一批钢材牌号为Q235时，是否钢材的屈服点就是235MPa?
你知道钢材的屈服点大致分布情况如何？
6如何理解“钢材的塑性指标比钢材的强度指标更重要”？
7 了解屈强比的概念。你认为屈强比高的材料（0.9左右）和屈强 比低（0.6—0.7)的材料分别用在哪些场合是合适的？
8描述钢材“怕冷”，“怕热”的大致范围？
高温和低温下可否使用钢结构？
9 一块平板，经过冷加工成为圆管，再用一条焊缝将其焊起来，在 焊接之前钢材经历了什么变化？在焊接之后钢材又经历了什么变 化？
10假如平板经冷加工成为方管，是否能回答与上面相同的问题？
1 steel tensile specimens stress and intensity of these two concepts are the same?
What are the two main factors that affect the strength of steel and the plasticity index?
The 3 elongation is how to define?
4 why the design of steel structures steel elongation requirements?
5 If a group of steel grades for the Q235 whether the yield point of steel is 235MPa?

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6 how to understand the the steel plasticity index is more important than the strength of the steel indicators "?
7 to understand the concept of the yield ratio. Do you think the material than the high yield (0.9%) and the yield ratio is low (0.6-0.7) materials were used in which case it is appropriate?
8 depicts steel "cold", the approximate range of the "heat intolerance"?
The feasibility of using high temperature and low temperature steel structure?
9 plate after cold working to become a tube, then a weld to weld steel before welding experience what has changed? After welding steel experienced what changes?
10 if the tablet is a square tube after cold working, is it possible to answer the same problem with the above?