UHPC应用于大跨径柔性桥梁的组合优化研究

Study on Combination Optimization of Long Span Flexible Bridge with UHPC

大型跨径柔性钢桥目前成为国内外建筑领域专家和学者广泛关注的话题。研究提出一种大跨径柔性桥梁钢-UHPC组合桥面有限元模型,在分析大跨径柔性桥梁钢-UHPC组合桥面疲劳的基础上,利用有限元分析软件完成建模。60 mm UHPC层钢桥面所有疲劳细节应力幅度下降趋势相对于45 mm UHPC层更为显著,6个细节下降幅度依次约为25%、18%、18%、16. 5%、10. 8%、15%。横隔板厚度从10 mm增厚到14 mm以及16 mm,疲劳细节4和5的应力幅下降范围为20%~29%,细节3最大应力幅增加幅度范围为5%~8%,且得到一种设计方案不会出现桥面疲劳开裂。

Large span flexible steel bridge has become a hot topic for experts and scholars in the field of construction at home and abroad.A finite element model of steel-UPHC composite deck of long-span flexible bridge was proposed.Based on the fatigue analysis of steel UPHC composite deck of long-span flexible bridge,the finite element analysis software was used to complete the modeling.Compared with 45 mm UHPC layer,the stress amplitude of all fatigue details of 60 mm UHPC layer steel bridge deck decreases more significantly,and the decrease amplitude of six details is about 25%,18%,18%,16.5%,10.8%and 15%respectively.When the thickness of diaphragms increases from 10 mm to 14 mm and 16 mm,the decrease range of stress amplitude in detail 4 and 5 is 20%-29%,and the increase range of maximum stress amplitude in detail 3 is 5%-8%.At the same time,a design scheme was obtained to avoid fatigue cracking of bridge deck.