长沙理工大学学报（自然科学版）2017，Vol.14Issue(1)：54-60,7.
大跨度钢管混凝土拱桥钢管初应力的释放转移
Initial stress release and transfer of steel tube onlarge-span CFST arch bridge
摘要
Abstract
In order to improve the performance of the main arch of the large-span CFST arch bridge, a new idea on the initial stress release and transfer of the steel tube was presented.Take debonding measures for steel tube before pouring concrete,after the concrete is poured and the strength is reached,cutting off the steel tube to allow the initial stress of the steel tube to be transferred to the core concrete, and then reconnected the steel tube so that it together with the concrete bears the follow-up load.According to the above ideas ,the finite element method was used to analyze the case of a single pipe rib CFST arch bridge and a truss rib CFST arch bridge.The analysis shows that without friction the initial stress of the steel tube can be effectively released and transferred to the core concrete after the steel tube is cut off.Compared with the original design, after the initial stress release and transfer, the stress on the steel tube of the arch rib is significantly reduced under the completion state.For the truss CFST arch bridge,the maximum stress can be reduced by 14.5%.Considering the confining effect, the stress of concrete filled steel tube is greatly increased, but still under the compressive strength of concrete.It proves that this method can significantly improve the combination efficiency of arch rib section of the large-span CFST arch bridge, and improve the performance of the main arch rib.关键词
钢管混凝土拱桥/初应力/释放转移/受力性能/有限元分析Key words
CFST arch bridge/initial stress/release and transfer/mechanical behavior/finite element analysis分类
交通工程引用本文复制引用
涂光亚,付瑶,颜东煌..大跨度钢管混凝土拱桥钢管初应力的释放转移[J].长沙理工大学学报（自然科学版）,2017,14(1):54-60,7.基金项目
国家自然科学基金资助项目(51478049) （51478049）
