小错层异形钢梁的设计探讨

DISCUSSION ON DESIGN OF SPECIAL SHAPED STEEL BEAM OF LOW STAGGERED FLOOR

钢结构小错层处常用的截面形式为异形钢梁,常用的设计软件PKPM建模中没有其截面模块,在设计时,一般采用忽略T型键的简化计算。通过比较异形梁的简化计算和按规范公式计算容许应力下的荷载值,发现简化计算针对不同的截面尺寸有时偏安全而有时偏于不安全,建议在强度计算时应考虑整道梁的抗弯刚度。

A special shaped steel beam is often used for a steel low staggered floor. And in commonly used design software PKPM there is no the section module of this beam. The simplified calculation which neglects T form beam is used when a design is done. Through a comparison between the simplified calculation of the special shaped beam and the load values under allowable stress by code formula, it is discovered that the simplified calculation sometimes is safe and sometimes is unsafe for different section sizes, and is suggested that the flexural stiffness of the whole beam should be taken into account in strength calculation.