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首页> 外文会议>SP-228; International Symposium on Utilization of High-Strength/High-Performance Concrete vol.1; 20050620-24; Washington,DC(US) >Stability of Long-Span Pretensioned High-Performance Concrete Girders
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Stability of Long-Span Pretensioned High-Performance Concrete Girders

机译：大跨度预应力高性能混凝土梁的稳定性

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摘要

Development of high performance concrete has increased the span length of given size precast prestressed girders up to 40 percent. While the designer's main concerns were the safety and stability of the bridge once construction was completed, attention should also be given to the temporary stresses and stability of these precast girders during handling, erection and construction. This research investigated long-span girder stability during handling and erection along with girder stability during bridge deck construction. Bulb-tee, NU (developed by the University of Nebraska) and AASHTO sections were considered. The effects of intermediate diaphragms on the behavior of long span prestressed high performance concrete girder bridges were evaluated using finite element analysis. The limit on diaphragm spacing as stated in AASHTO was found to be conservative. Different methods to improve the lifting spans of long high performance concrete girders were also recommended. The outcome of this research will expedite and help assure safety in the construction of high performance concrete long-span girders.
机译：高性能混凝土的发展使给定尺寸的预制预应力大梁的跨度增加了40％。尽管设计人员主要关注的是桥梁一旦完成建造的安全性和稳定性，但在处理，安装和建造过程中，还应注意这些预制梁的临时应力和稳定性。这项研究调查了在处理和安装过程中大跨度梁的稳定性以及桥梁桥面施工期间的梁稳定性。考虑了南极洲Bulb-tee（由内布拉斯加大学开发）和AASHTO部分。使用有限元分析评估了中间隔板对大跨度预应力高性能混凝土箱梁桥性能的影响。发现AASHTO中对隔膜间距的限制是保守的。还建议采用不同的方法来改善高性能混凝土大梁的举升跨度。这项研究的结果将加快并帮助确保高性能混凝土大跨度大梁的施工安全性。

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