基于有限元的盘扣支架稳定性及影响因素研究

Research on Stability and Influencing Factors of Disk Buckle Bracket Based on Finite Element Method

摘要:

随着桥梁等大基建的发展，大临结构盘扣支架稳定性的分析越来越重要。依托工程背景为某现浇桥梁支架，通过对不同设计参数的变化，分析对盘扣支架承载性能的影响。基于数值模拟分析软件研究该盘扣支架的应力、变形、承载极限等变化。重点对立杆间距和立杆高度两种设计参数对盘扣支架的承载性能影响开展研究。结果表明：随着立杆间距、立杆高度的增大，支架承载性能逐渐降低；立杆间距为0.6 m时，支架的承载能力最强；在强风地带搭设支架时建议增设连墙杆件或者缩小立杆间距来增强支架稳定性。在实际工程中，若搭设高模板支架，可以通过增设斜杆或者连墙杆件增强支架的稳定性。高度大于16 m小于24 m支架顶层满布斜杆，大于24 m支架整体满布斜杆设置。

Abstract:

With the development of major infrastructure such as bridges, the analysis of the stability of large temporary structure disk buckle brackets is becoming increasingly important. Taking a cast-in-place bridge bracket as the engineering background, and through the different design parameter changes, the influence on the bearing performance of the disk buckle bracket is analyzed. Based on numerical simulation analysis software, the stress, deformation, bearing limit and other changes of the disk buckle bracket are studied. The focus is on the study of the influence of two design parameters of the upright spacing and the upright height on the load-bearing performance of the disk buckle bracket. The results show that with an increase in the spacing and height of upright, the load-bearing performance of the bracket gradually decreases. When the upright spacing is 0.6 m, the load-bearing capacity of bracket is the strongest. It is suggested to increase the member bars of underground diaphragm wall or reduce the upright spacing in order to enhance the stability of the bracket when a bracket is erected in a high wind zone. In actual engineering, if a high formwork bracket is erected, the stability of the bracket can be enhanced by adding the diagonal braces or diaphragm wall member bars. For the brackets with a height greater than 16 m but less than 24 m, the top layer should be fully covered with diagonal braces; and for brackets with a height greater than 24 m, the entire bracket should be fully covered with diagonal braces.