侧向冲击作用下钢管混凝土柱动力响应 试验研究及计算方法

为了揭示钢管混凝土柱在侧向冲击荷载作用下的破坏机理，完成了7个钢管混凝土柱和1个部分填充钢管混凝土柱以及1个空钢管柱的水平横向冲击试验，考虑了冲击速度、冲击质量、冲击能量以及柱端约束等关键因素对钢管混凝土柱侧向冲击动力响应的影响。结果表明：与空钢管柱比较，钢管混凝土柱和部分填充钢管混凝土柱在侧向冲击荷载下的抗冲击承载力、抗变形能力提高显著；一端固支一端简支的钢管混凝土柱易发生受剪破坏，而悬臂柱则发生根部弯曲破坏；钢管混凝土柱的冲击力和残余位移均随着冲击速度、冲击能量的增大而显著增大。结合现行钢管混凝土结构设计规范，通过引入动力放大系数R和能量吸收比k提出了钢管混凝土结构柱抗冲击承载力计算方法，并明确了系数R与k的取值方法。

Dynamic response of concrete filled steel tube column under lateral impact load: experimental study and calculation method

To reveal the failure mechanism of concrete filled steel tube column under lateral impact load, seven concrete filled tube columns, one partially concrete filled tube column and one empty steel tube column, subjected to lateral impact load, were investigated experimentally. The influences of impact speed, impact mass, impact energy and column end restraint on the dynamic response of concrete filled steel tube column under lateral impact load were taken into consideration. The test results indicate that the concrete filling can effectively improve the impact bearing resistance and deformation capability. The concrete filled steel tube columns with one fixed end and one simply supported end were susceptible to shear failure, whereas the cantilever columns were susceptible to flexural damage. The impact force and residual displacement increased obviously with the increase of impact speed and impact energy. Based on the current Chinese code, a calculation method was proposed by introducing the dynamic magnification coefficient R and energy absorption ratio k, and how to take the values of coefficients R and k was also clarified.