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劉   旭

 

（ 新疆鐵道勘察設(shè)計(jì)院有限公司 ，新疆 烏魯木齊 830011)

摘   要 ：為了降低徐變變形對橋梁結(jié)構(gòu)性能、使用壽命及安全性的不利影響，提出一種高性能粉煤灰混凝土橋梁徐變變形控制方法。以高性能粉煤灰混凝土為例，構(gòu)建有限元模型，獲取橋梁的徐變參數(shù)，并提出延長鋪軌時(shí)間、設(shè)計(jì)鋪設(shè)恒載的順序、策劃體內(nèi)和體外預(yù)應(yīng)力束徐變變形控制方法。結(jié)果表明：使用 4 種控制方法 后有效降低了徐變變形引起的橋梁下?lián)现蹬c橋梁上拱值，有效控制了混凝土橋梁的后期變形，說明所提方法是合理可行的，可為今后工程設(shè)計(jì)提供一定的理論依據(jù)。

關(guān)鍵詞：高性能粉煤灰；徐變變形；橋梁構(gòu)件；混凝土強(qiáng)度

中圖分類號：TU375           

文獻(xiàn)標(biāo)志碼：A           

文章編號： 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

作者簡介： 劉  旭  (1992—) , 男，碩士，工程師，研究方向：橋梁。

收稿日期：2023- 03- 30