由于高强度钢材的屈服极限不断地增大，下潜深度的不断增加，弯曲微分方程解的形式将不仅限于复数解。
Increasing the yield limit of high strength steel, and increasing the depth of submergence, the form of the differential equation's result will not only be limited with the complex number.
考虑高温下钢材的弹性模量以及屈服强度的变化。
Variation of the elastic modulus and yield strength of steel with temperature rise was considered.
钢材经过冷作硬化成型后，材料屈服强度会有明显的提高。
Steel materials will be obviously hardened after the cold-formed process.
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