混凝土梁侧锚固钢板受压屈曲特性的数值模拟

Numerical Simulation of Buckling of Steel Plates in Bolted Side-Plated Reinforced Concrete Beams

采用ABAQUS软件进行参数分析,研究了梁侧锚固钢板加固混凝土梁中钢板屈曲特性受不同屈曲限制措施的影响及其变化规律.结果表明:受压钢板屈曲特性对初始几何缺陷不敏感;增大钢板厚度能提高试件屈曲承载力;减小钢板受压区螺栓间距和配置截面更大的纵向加劲肋不仅能有效提高屈曲承载力,还能有效约束侧向起拱;配置横向加劲肋对提高屈曲承载力无明显效果;纵向加劲肋对屈曲承载力的加强效果可分解为加劲肋自身屈服承载力及其对受压钢板的屈曲约束两部分,并可通过拟合公式较准确地进行计算.

A parametric analysis using ABAQUS was conducted to study the effects of different buckling restraint measurements on the local buckling of steel plates in bolted- side-plated （BSP） beams. The results show that the buckling behavior is not sensitive to the initial imperfection of the bolted steel plates; thicker steel plates result in a greater buckling strength; less bolt spacing and larger longitudinal stiffeners improve the buckling strength and decrease the lateral buckling camber; the buckling restraint caused by transverse stiffeners is ignorable; and the enhancement of buckling strength beneficial from longitudinal stiffeners can be divided into the yield strength of the stiffeners and the buckling restraint effect. The proposed fitted formulae can evaluate the buckling strength accurately.