钢管混凝土拱桥动态悬吊式主梁结构改造技术

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发布时间：2022-07-07

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摘要：沈阳浑河长青大桥主桥为(127+142+127）m 的中承式钢管混凝土拱桥,桥面系由
横梁与桥面板组成,其主梁体系采用动态悬吊式结构，由于缺乏纵向联系,桥梁整体性及动力特性
较差,存在较大的安全隐患，为提高该桥的整体安全性,在混凝土横梁间增设2道钢级梁和5道混
最七纵梁，分别采用抱箍和植筋方式与梁连接，一个拱同内的动态式主梁体系变为空间纠
横梁框架连续体系，并采用MIDAS软件建立改造后的全桥有限元模型，分析5种工况下吊杆、拱
力、钢级梁的应力及结构整体动力特性，结果表明：加固后桥梁的安全储备显著提高,各构件受力
均满足要求,动力特性及自振频率得到极大改善,竖向位移明显减小。
关键词：钢管混凝土拱桥;动态悬吊式结构;主梁结构;纵梁;有限元法;桥梁加固
中图分类号：U448.22:U445.72
文献标志码：A
RehabilitationTechniques for Dynamically Suspended
MainGirderStructure of a CFST Arch Bridge
ZHANG Wu1.2,WU Yum-hong1.2
(1. Wuhan Bndge Special Technology Co, Ltd, China Railway Major Bridge Engineering Group, Wuhan 430074.
China: 2. State Key Laboratory for Health and Safety of Bridge Structures，Wuhan 430034, China）
Abstract: The main bridge of the Changqing Bridge over Hunhe River in Shenyang is a half-
through concrete-filled steel tube (CFST) arch bridge with span arrangement(127+142+127)m.
The floor system of the bridge is originally composed of the concrete cross beams and deck slabs
and the structural system of the main girder is the dynamically suspended structure.For lack of
he longltudinal bracing systems , the mtegrity and dymamlc propertles of the brldge are and
the bridge has had rather severe hidden safety danger. 10 Improve the integral safety of the
bridge, the bridge was rehabilitated and between the concrete cross beams, each 2 steel and 5 con-
crete stringers were added, the added stringers and the cross beams were connected respectively by
the girdles and by way of implanting the reinforcement and the dynamically suspended main girder
system in a arch ring was thus changed into a continuous system of the spatial cross beam and
stringer frame. The software MIDAS Civil was used to set up the finite element model for the
whole bridge of the rehabilitated bridge and the stress of the suspe nders, arch ribs and steel string-
ersand the structural integritvand dvnamic DroDes under 5 load cases were analvzed. The re-
sults of the analvsis show that the safetv margin of the rehabilitated bridee is significantlv im
Droved and the force conditions of the various components can meet the requirements The dwmamic
properties and natural vibration frequencies are greatly improved and the vertical displacement is
significantly reduced.
Key wonds：concrete-filled steel tube arch bridge；dynamically suspended structure；main gird-
er structure；stringer；finite element method；bridge strengthening