大跨度连续刚构桥超长预应力钢束优化设计研究  

Optimized Design of Ultra-long Prestressed Steel Bundles for Large Span Continuous Rigid Frame Bridges

作　　者：苏惠 SU Hui(China Railway 16th Bureau Group Road and Bridge Engineering Co.,Ltd.,Beijing 101500,China)

机构地区：[1]中铁十六局集团路桥工程有限公司,北京101500

出　　处：《黑龙江交通科技》2024年第3期74-78,共5页Communications Science and Technology Heilongjiang

基　　金：中铁十六局集团路桥工程有限公司计划项目《高烈度区高墩大跨径连续梁拱桥施工综合技术研究》(K2018-08-5)。

摘　　要：针对超长预应力钢束整体损失会导致大跨度连续刚构桥跨中出现持续下挠和腹板开裂的现象,基于合理成桥状态的优化设计思路,以减小超长钢束的摩阻损失为控制目标,提出平行交错锚固和分段锚固两种优化布置方案,将其与通长束布置形式下的主梁挠度、应力以及预应力储备能力等方面进行对比分析。结果表明:平行交错锚固和分段锚固两种方案钢束预应力储备分别提高了21.53%和20.76%,成桥阶段跨中实腹段下挠程度分别减小了14.28%和88.91%,两种优化方案均能改善结构的承载能力,但分段锚固方案较平行交错锚固方案改善效果更明显。For long prestressed steel beam overall loss will cause large span continuous rigid bridge span of continuous scratching and web cracking,based on the optimization design of the reasonable bridge state,to reduce the resistance loss of the control target,put forward two parallel staggered anchor and segment anchor optimization scheme,and the main beam deflection,stress and prestress reserve ability of comparative analysis.The results show that the prestressed reserve of parallel staggered anchorage and segmented anchorage increased by 21.53%and 20.76%respectively,and the bending degree of the middle stage of the bridge was reduced by 14.28%and 88.91%respectively.The two optimization schemes can improve the carrying capacity of the structure,but the improvement effect is more obvious than that of the parallel staggered anchorage scheme.

关 键 词：连续刚构桥 超长预应力束 预应力摩阻损失 优化布置 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]