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刘   旭

 

（ 新疆铁道勘察设计院有限公司 ，新疆 乌鲁木齐 830011)

摘   要 ：为了降低徐变变形对桥梁结构性能、使用寿命及安全性的不利影响，提出一种高性能粉煤灰混凝土桥梁徐变变形控制方法。以高性能粉煤灰混凝土为例，构建有限元模型，获取桥梁的徐变参数，并提出延长铺轨时间、设计铺设恒载的顺序、策划体内和体外预应力束徐变变形控制方法。结果表明：使用 4 种控制方法 后有效降低了徐变变形引起的桥梁下挠值与桥梁上拱值，有效控制了混凝土桥梁的后期变形，说明所提方法是合理可行的，可为今后工程设计提供一定的理论依据。

关键词：高性能粉煤灰；徐变变形；桥梁构件；混凝土强度

中图分类号：TU375           

文献标志码：A           

文章编号： 1005- 8249   (2024)  05- 0116- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .021

 

LIU Xu

(Xinjiang Railway Survey and Design Institute Co.，Ltd.，Urumqi 830011 ,   China)

Abstract: In order to reduce the adverse effects of creep deformation on the performance, service life, and safety of bridge structures, a high-performance fly ash concrete bridge creep deformation control method is proposed. Taking high-performance fly ash concrete as an example, a finite element model is constructed to obtain the creep parameters of the bridge, and to propose methods for extending the track laying time, designing the sequence of laying dead loads, and planning the creep deformation control of internal and external prestressed tendons. The results showed that the use of four control methods effectively reduced the deflection and arch values of the bridge caused by creep deformation, and effectively controlled the later deformation of the concrete bridge. This indicates that the proposed methods are reasonable and feasible, and can provide a certain theoretical basis for future engineering design.

Keywords: high performance fly ash; creep deformation; bridge components; concrete strength

作者简介： 刘  旭  (1992—) , 男，硕士，工程师，研究方向：桥梁。

收稿日期：2023- 03- 30