大挑臂复合截面节段梁挑臂连接构造研究

Research on Connection Structure of Cantilevers in Segmental Beams with Large Cantilever Composite Sections

摘要:

为解决宽桥面节段梁运输吊装困难、传统多箱断面施工复杂等问题，系统研究了大挑臂复合截面节段梁的后装挑臂连接构造。通过归纳分析6种关键连接构造，提出了5种合理的成套连接方案。结合有限元方法分析对比了各方案在受力性能、施工效率、经济指标及超高渐变段适应性等方面的表现。研究成果为大挑臂复合截面节段梁的连接设计，提供了理论依据与实践指导，推荐的方案一在直线及圆曲线段桥梁中综合性能最优，方案二凭借良好的受力性能与对超高渐变段的适应能力，可适用于复杂线形桥梁。

Abstract:

To address the difficulties in transporting and hoisting segmented beams of wide bridge decks and the complexity of traditional multi-box section construction, the connection structures of post-installed cantilevers in large cantilever composite cross-section segmental beams are systematically studied. By sorting out and analyzing six types of key connection structures, five reasonable complete connection schemes are proposed. Combined with the finite element method, the performances of each scheme in terms of force performance, construction efficiency, economic indicators and adaptability to ultra-high gradient sections are analyzed and compared. The results show that the theoretical basis and practical guidance are provided for the connection design of large cantilever composite cross-section segmental beams. The recommended Scheme 1 exhibits the optimal comprehensive performance for straight and circular curved bridges, and Scheme 2 is suitable for the bridges with complex alignments by means of good load-bearing performance and adaptability to extremely high gradient sections.