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錢若霖 ， 蘇   佩 ，黃春暉

（ 陜西工業職業技術學院 土木工程學院 ，陜西 咸陽 712000)

摘   要 ：隨著交通強國建設的不斷推進，PC 連續剛構橋以其出色的跨越能力和耐久性，廣泛用于多樣化的 橋梁建設中。然而，這種橋梁結構在長期使用過程中可能出現的下撓問題，對其穩定性和使用壽命產生了重大影響。基于全橋有限元仿真模型，分別選取了自重、徐變、預應力損失以及剛度折減四個主要參數，對其下撓表現的敏感性展開研究。結果表明：混凝土的超重增幅 、初始加載齡期過短、成橋時間、預應力的損失以及剛度的折減均會對橋梁長期下撓產生不利影響，有針對性的采取相應措施可以有效避免長期下撓的持續發展。以便在設計、施工和運營中科學決策，為同類橋梁建設提供理論支持和技術指導。

關鍵詞：連續剛構橋 ；撓度 ；有限元 ；敏感性分析

中圖分類號：U448 . 11            

文獻標志碼：A            

文章編號： 1005- 8249  (2024)  05- 0103- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .019

 

QIAN Ruolin ,  SU Pei ,  HUANG Chunhui

(Civil Engineering College ,  Shannxi Polytechnic Institute ,  Xianyang 712000 ,  China)

Abstract：With the continuous promotion of the construction of a transportation powerhouse, PC continuous rigid frame bridges are widely used in diversified bridge construction due to their excellent crossing ability and durability. However, the possible downward deflection issues that may occur during long-term use of this bridge structure have a significant impact on its stability and service life. Based on the finite element simulation model of the entire bridge, four main parameters, namely self weight, creep, prestress loss, and stiffness reduction, were selected to study the sensitivity of their downward deflection performance. The results indicate that the increase in overweight of concrete, short initial loading age, bridge completion time, loss of prestress, and reduction in stiffness can all have adverse effects on the long-term deflection of the bridge. Targeted measures can effectively avoid the sustained development of long-term deflection. In order to make scientific decisions in design, construction, and operation, and provide theoretical support and technical guidance for the construction of similar bridges.

Keywords：continuous rigid frame bridge; deflection; finite element analysis; sensitivity analysis

作者簡介：錢若霖  (1993—) ,   男 ，碩士 ，講師 ，研究方向： 橋梁結構分析。

收稿日期：2023- 07- 27