[Engineering Version] Daily Question 20180529

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Which of the following statements regarding steel materials used in steel structures is correct? ( ) A. I-beams are mainly used as members that bear axial forces, beams that resist lateral bending, and as connecting elements. B. Q235A denotes a steel with a yield strength of 235 N/mm2, grade A, and it is a normalized steel. C. All low-alloy high-strength structural steels are either normalized steels or specially normalized steels. D. Channel steels are widely used in various building structures and bridges; they are primarily used as members that resist lateral bending, but they are not suitable for use as members subjected to axial compression or bilateral bending. Answer: C 【Explanation】Q235A refers to a steel with a yield strength of 235 N/mm2, grade A, and it is a normalized steel. All low-alloy high-strength structural steels are killed steels or specially killed steels. I-beams are widely used in various building structures and bridges; they are primarily used as members that withstand lateral bending (bending within the plane of the web), but they are not suitable for use as members subjected to axial compression or bending in two directions. Channel steel is mainly used for members that bear axial forces, beams that withstand lateral bending, and connecting members.