本文關(guān)鍵詞：預應力折線形鉸接鋼拱加固拱橋技術(shù)研究　出處：《重慶交通大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 拱橋加固 預應力鉸接鋼拱 模型實驗 內(nèi)力優(yōu)化 抗壓承載力

【摘要】：我國有相當部分拱橋，尤其是早期修建的拱橋，由于結(jié)構(gòu)設(shè)計上不夠完善，未能達到規(guī)定要求，以及施工質(zhì)量不佳等原因，特別當時片面強調(diào)大跨徑、省材料等因素，致使很多拱橋存在不同程度的病害。然而，在一定時期內(nèi)，由于財力有限，許多拱橋?qū)⒗^續(xù)使用，短時間內(nèi)不可能全用新橋替換，為保證運營安全，對一些橋梁進行維修加固是難以避免的。橋梁的維修加固具有較大的經(jīng)濟效益，因此，研究拱橋的加固方法，對拱橋進行技術(shù)改造，提高其承載能力成了當前公路橋梁建設(shè)中急待解決的問題。 預應力折線形鉸接鋼拱加固拱橋是基于拱橋受力特點提出的一種有效的預應力主動加固方法。該加固技術(shù)是針對在役上承式混凝土拱橋，，在原主拱圈下增設(shè)鉸接折線形鋼拱圈，通過在鉸接鋼拱拱腳部位施加軸向預應力，來達到改善、優(yōu)化原主拱圈在自重荷載作用下各主要截面（一般拱頂、1/4、3/8、5/8、3/4及拱腳部位等）內(nèi)力分布（主要是彎矩分布）的目的。通過加固調(diào)整、優(yōu)化實現(xiàn)拱橋主拱圈在恒載作用下的內(nèi)力重分布，使原主拱圈彎曲能量減少，有利于削減彎矩峰值和平緩變形，最后達到提高其承載和使用性能的目的。 本文以預應力鉸接鋼拱加固拱橋技術(shù)原理為依據(jù)，以新疆軍民團結(jié)橋為工程背景，建立其主拱圈縮尺模型，對比分析了縮尺模型在模擬自重荷載作用下，采用預應力折線形鋼拱加固前后各主要控制截面的應變、撓度指標。從加固前后試驗拱的應變、撓度值對比可以看出，縮尺模型經(jīng)加固增強處理后，各控制截面偏心距減小了，主拱圈彎曲能量也有大幅減小。結(jié)果說明新增加的鋼拱圈能夠與實驗縮尺模型協(xié)調(diào)變形，分擔部分自重荷載作用效應，減少了縮尺模型拱圈彎曲能和控制截面偏心距，從而提高了拱圈正截面的抗壓承載力。 本文最后以渝北龍興鎮(zhèn)石門拱橋為例，采用該加固方法對其加固，并對加固前及加固后的彎矩包絡(luò)圖進行對比，證實使用該預應力折線形鋼餃拱加固后使原橋承載力得到提高。該加固技術(shù)對改善類似線形不佳或自重內(nèi)力條件不利的拱橋的承載力和使用性能，效果顯著，可廣泛應用于實踐。
[Abstract]:I owned a considerable part of arch bridge, especially the early construction of the bridge, because the structure design is not perfect, can not meet the requirements, and the poor quality of construction and other reasons, especially when the one-sided emphasis on the large span, factors of materials, resulting in a lot of arch bridges have different degrees of disease. However, in a certain period of time, due to limited financial resources many will continue to use the arch bridge, a short period of time can not fully use bridge replacement, in order to ensure the operation safety of some bridge reinforcement is difficult to avoid. Bridge maintenance reinforcement has great economic benefits, therefore, reinforcement methods of arch bridge, arch bridge to carry out technological transformation, improve the bearing capacity of the urgent to solve the current problems in highway bridge construction.
Prestressed mansard arch reinforcement hinged steel arch bridge is a kind of effective active reinforcement method of prestressed arch bridge. Based on the stress characteristics of the reinforcement technique for in-service deck arch bridge, an articulated folding steel arch in the original arch ring, through the hinged steel arch foot position is applied to improve the axial prestress. The owner, optimization of arch under self weight load under the action of the main section (general 1/4,3/8,5/8,3/4 vault, and the arch part etc.) internal force distribution (mainly moment distribution purposes.) by strengthening the adjustment, optimize internal force of arch ring under constant load redistribution, the main arch bending energy reduction, to reduce the bending moment the peak and the slow deformation, finally to improve the bearing performance and purpose.
In this paper the prestressed steel arch bridge reinforcement technology is based on the principle, to Xinjiang unity bridge as the engineering background, the establishment of the main arch scale model, comparative analysis of the scale model in the simulation of gravity loads, the prestressed concrete steel arch strain, the main control section of the deflection index before and after reinforcement. From the strain before and after reinforcement test of arch deflection, the contrast can be seen, the scale model by strengthening the enhanced after treatment, the control section of the eccentricity is reduced, the main arch bending energy has also greatly reduced. Results show that the new steel arch deformation and experimental scale model of coordination, sharing part of the dead load effect, scale model of arch bending and control the section eccentricity is reduced, thus improving the bearing capacity of normal section compressive arch.
The Shimen Yubei Longxing town arch bridge as an example, using the reinforcement method of the reinforcement, and compares the reinforcement before and after reinforcement moment envelope diagram, confirmed using the prestressed concrete steel arch bridge reinforcement after the dumplings are improved. The carrying capacity of the reinforced technology on bearing capacity and performance, improve the similar linear or poor dead load internal force unfavorable conditions arch effect, can be widely used in practice.

【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.22;U445.72

【參考文獻】

中國期刊全文數(shù)據(jù)庫 前1條

1 蒙云;梁傳波;戚志河;;復合加固法提高石拱橋承載力在大件運輸中的應用[J];重慶交通學院學報;2006年S1期

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