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长挑臂闭口钢箱组合梁桥设计及其关键技术

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为满足黄河桥梁跨度需求和减少临时施工设施对黄河泄洪的干扰,该文以临猗黄河大桥为依托,其主桥采用(112+28×128+120)m连续长挑臂闭口钢箱组合梁,共分两联,最大联长1 912 m.钢箱组合梁采用无临时墩顶推法施工,闭口钢箱梁顶推到位后再安装桥面板,桥面板安装顺序为先跨中正弯矩区后支点负弯矩区.重点对组合梁负弯矩区力学性能优化措施、斜撑抗疲劳设计和2.5 m高声屏障抗风优化设计3个关键技术问题开展研究,结果表明:负弯矩区采用双结合构造可降低钢箱梁底板压应力和桥面板裂缝宽度,张拉体外预应力钢束的优化效果随着混凝土收缩徐变作用逐渐降低;相同截面积的方钢管斜撑抗疲劳性能优于圆钢管;折线形声屏障可有效抑制主梁涡振响应.
Design and Key Technologies of Bridges with Long-Cantilever Closed Steel Box Composite Girder
In order to meet the span requirements of bridges over the Yellow River and reduce the interference of temporary construction facilities on flood discharge from the Yellow River,the Linyi Yellow River Bridge was studied.The main bridge adopted a continuous long-cantilever closed steel box composite girder of(112+28×128+120)m and was divided into two parts,with the maximum length of the parts being 1 912 m.The steel box composite girder was constructed by incremental launching method without temporary piers,and the bridge deck was installed after the closed steel box girder was in place.The installation sequence of the bridge deck was from the positive bending moment area in the middle of the span to the negative bending moment area at the fulcrum.The research focused on three key technical issues:optimization measures of mechanical properties in the negative bending moment area of the composite girder,fatigue resistance design of diagonal braces,and optimization design of wind resistance of a 2.5 m-high acoustic barrier.The results show that the compression stress on the bottom plate of the steel box girder and the crack width of the bridge deck can be reduced by using the composite structure in the negative bending moment area.The optimization effect of externally tensioned prestressed steel bundles decreases gradually with the shrinkage and creep of concrete.The fatigue resistance of diagonal braces of square steel pipes with the same cross-sectional area is better than that of round steel pipes.The polygonal acoustic barrier can effectively suppress the vortex response of the main girder.

long-cantilever closed steel box composite girderincremental launching constructionnegative bending moment areafatigue performanceacoustic barrierwind tunnel tests

季建东、王彬

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山西交科公路勘察设计院有限公司,山西 太原 030032

山西省交通规划勘察设计院有限公司,山西 太原 030032

长挑臂闭口钢箱组合梁 顶推施工 负弯矩区 疲劳性能 声屏障 风洞试验

山西交科集团创新发展计划山西交通控股集团有限公司科技项目

21-JKCF-052021-JKKJ-06

2024

10.14048/j.issn.1671-2579.2024.03.016

中外公路
长沙理工大学

中外公路

CSTPCD
影响因子：0.626
ISSN：1671-2579
年,卷(期)：2024.44(3)
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