钢-UHPC组合梁桥负弯矩作用下的设计优化  

Design Optimization of Steel-UHPC Composite Girder Bridges Under Negative Moment

作　　者：周可攀 ZHOU Kepan(Guangdong Communication Planning&Design Institute Group Co.,Ltd.)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司

出　　处：《广东建材》2024年第6期93-95,共3页Guangdong Building Materials

摘　　要：负弯矩区开裂是钢混组合梁桥的主要技术难题,利用钢-超高性能混凝土(UHPC)可以显著改善甚至规避钢混组合梁桥负弯矩区的开裂问题。本文基于钢-UHPC组合梁数值分析,研究了不同设计参数对钢-UHPC组合梁桥在负弯矩作用下的极限承载能力和开裂弯矩的影响。研究结果表明,采用一定厚度的UHPC和普通混凝土组合的方式可以显著改善结构的抗裂性能,而增加UHPC强度等级、厚度尺寸以及栓钉的直径对于刚度和极限抗弯承载能力并没有显著影响。这些结果可以为钢-UHPC组合梁桥的设计提供优化参考。Concrete cracking in negative bending moment regions is a critical issue of steel-concrete composite girder bridges.While the ultra-high performance concrete could improve or even avoid such a cracking issue effectively.Based on numerical analysis of steel-UHPC composite girders,the influence of various design parameters on the ultimate bearing capacity and cracking capacity of the steel-UHPC composite girder bridges under negative bending moment was studied.The results indicate that the combination of ordinary concrete and UHPC with a certain thickness can significantly improve the crack resistance of the structure.However,increasing the strength grade and thickness of UHPC,and changing the diameter of studs has only a slight effect on the stiffness and ultimate beading capacity of the composite structure.These results can provide references for the design optimization of steel-UHPC composite girder bridges.

关 键 词：钢-UHPC组合梁桥 负弯矩 结构性能 数值分析 设计优化 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]