UHPC在连续组合梁负弯矩区的受力性能研究

A Study on Force Performance of UHPC in Negative Moment Zone of Continuous Composite Beam

摘要:

通过对组合连续梁负弯矩区影响因素的建模分析，建议超高性能混凝土（UHPC）桥面板厚度与组合梁高度之比为1/5~1/9，组合梁高度与跨径的比值为1/18~1/22，钢梁与UHPC桥面板刚度之比为2~10；钢-UHPC组合连续结构梁高远低于钢-C50混凝土组合连续梁结构梁高，结构负弯矩区UHPC桥面板不开裂。

关键词:UHPC;连续组合梁桥;负弯矩

Abstract:

By modeling and impact analysis of negative moment zone of composite continuous beam, it is suggested that the ratio of thickness of UHPC deck to the height of composite beam is 1/5~1/9, the ratio of height of composite beam to the span is 1/18~1/22, and the ratio of rigidity of steel beam to UHPC deck is 2~10. The height of steel-UHPC composite continuous beam structure is much lower than that of steel-concrete composite continuous beam structure, and the UHPC deck in the negative moment zone of the structure does not crack.

Key words:UHPC, continuous composite beam bridge, negative moment