论文部分内容阅读
针对一字形内芯全钢防屈曲支撑的失效模式,建立其设计方法。对一字形内芯全钢防屈曲支撑的整体失稳破坏进行研究,根据支撑的构造特点及外套管最大弯矩,得到保证其整体稳定性的设计表达式;对一字形内芯全钢防屈曲支撑的局部失稳破坏进行研究,在分析内芯与外套管挤压作用的基础上,得到保证支撑局部稳定性的内芯宽厚比上限值表达式。结果表明:此上限值随外套管与内芯的间隙与内芯宽度之比的增大而减小,一般内芯宽厚比小于8可保证内芯的局部稳定性。
Aiming at the failure mode of all-steel anti-buckling brace of in-line core, the design method was established. Based on the structural characteristics of support and the maximum bending moment of outer casing, the design expression of ensuring the overall stability of the inner steel is obtained. Based on the analysis of the extrusion action of the inner core and the outer sleeve, the expression of the upper limit value of the core width to thickness ratio which ensures the local stability of the support is obtained. The results show that the upper limit decreases with the increase of the ratio of the clearance between the outer sleeve and the inner core to the width of the inner core. Generally, the aspect ratio of the inner core can be less than 8 to ensure the local stability of the inner core.