摘要
为了提高拱桥的刚度、稳定性、动力性能,提出了一种新的拱桥——预张拱桥,其结构原理是在1/4、1/2和3/4拱肋处设置刚性竖联连接拱肋与主梁,分别用预张索将跨中刚性竖联底部与1/4、3/4截面刚性竖联顶部连接,并施加预张力。从而预张拱桥的整体性、刚度和稳定性得到大幅提高,同时预张索的水平分力减小了部分拱脚推力。有限元分析表明,在不增加材料用量的前提下,通过减少横撑和吊杆材料用量来设置刚性竖联和预张索,预张拱桥的刚度、稳定性、动力性能等多项力学指标均优于传统柔性吊杆拱桥,拱肋最大压应力略有增加。新的结构体系对拱桥实现刚度提升、突破稳定性瓶颈提供了新的有效途径,并具有一定的美学价值和较好的工程应用前景,是一种具有竞争力的新桥型。
In order to improve the rigidity,stability and dynamic performance of arch bridge,a new type of arch bridge-pretensioned arch bridge is proposed.Its structural principle is to set up rigid vertical connection between arch and main beam in 1/4,1/2 and 3/4 section,a pretensioned cable is installed between rigid vertical top of 1/4,3/4 span and bottom of 1/2 span,and then pretension is appliedon it.On one hand,integrity,stiffness and stability of pretensioned arch bridge significantly improved;on the other hand,the horizontal component of pretension in 1/4,3/4 span reduces the thrust of the arch foot and the cost of balance of arch thrust.Finite element analysis shows that by reducing the amount of crossbar and boom material to set the rigid vertical and pretensioned cable without increasing the amount of material,the mechanical properties of the pretensioned arch bridge such as rigidity,stability and dynamic performance are much better than the traditional flexible suspension arch bridge,but a slight increase in stress.The new arch bridge is a competitive new bridge type which provides a new effective way for achieving breakthroughs in rigidity and stability of the arch bridge and has great value in engineering application.
作者
向桂兵
邓小康
谢肖礼
XIANG Gui-bing;DENG Xiao-kang;XIE Xiao-li(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Wuhan Municipal Engineering Quality Supervision Station,Wuhan 430010,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2019年第1期183-190,共8页
Journal of Guangxi University（Natural Science Edition）
基金
广西科技计划(桂科AB18126047)
广西防灾减灾与工程安全重点实验室系统性研究项目(2016ZDX0001)
关键词
拱桥
预张索
刚性竖联
稳定性
刚度
动力性能
arch bridge
pretension cable
rigid vertical connection
stability
rigidity
dynamic performance
