钢-混凝土组合梁弹性屈曲的力学性能

Mechanical behavior of elastic buckling of composite steel concrete beams

为避免钢混凝土连续组合梁发生局部失稳 ,对负弯区钢梁腹板在弯曲应力、轴向压应力和剪应力联合作用下的力学性能进行了研究。基于偏心受压与剪切作用下的相关方程和各种简单受力条件下的屈曲分析结果 ,计算了钢梁腹板在复杂应力状态下的弹性屈曲因数 ,并提出了组合梁在弹性受力阶段钢梁腹板不设横向加劲肋的高厚比限值。计算表明 ,连续组合梁负弯矩区钢梁腹板的弹性临界高厚比主要受弯曲应力的影响 ,其次为剪应力。与现有规范相比较 。

The mechanical behavior of steel webs with negative bending was studied with combined stress loads of flexure, axial pressure and shear to prevent local buckling in continuous composite beams. The elastic local buckling coefficient for complicated stress loads was calculated based on the critical buckling load for simple loading cases and interaction equations relating eccentric compression and shear. The limiting height to thickness ratio was also determined for webs without stiffening ribs in the elastic stage. The bending stress has more effect on the limiting height to thickness ratio than the shear stress. This method provides a better design method for composite steel concrete beams than the current design code.