空腹式石拱橋維修加固方法及承載能力評價研究
發(fā)布時間：2018-12-13 06:58
【摘要】：隨著交通量及車輛負載逐年增大,早期的石拱橋處于超負荷狀態(tài),出現(xiàn)各種形式的病害。作為山西省一條重要的運煤通道,國道G208交通量繁忙,而且存在嚴重的超載問題。由于汽車超載對橋梁的使用功能與安全功能都帶來了嚴重隱患,因此,檢測并加固存有問題的橋梁具有重要的現(xiàn)實意義。本文以國道G208山西運煤通道的一座空腹式石拱橋的維修加固為例,分析了該橋的主要病害,提出了針對性的加固方案;基于有限元方法進行了橋梁加固前后各個階段的力學分析;最后基于24小時實測交通量進行了加固后橋梁的承載能力評價。研究內(nèi)容集中在三個方面。第一,分析了該空腹式石拱橋的具體病害情況,確定了發(fā)生病害的內(nèi)在與外在原因;提出了針對性的加固設計方案。第二,基于MIDAS有限元分析軟件建立了全橋有限元模型,進行了加固各個階段的有限元模擬分析,給出了溫度以及活載作用下的橋梁結構位移值;對比了三鉸拱與兩鉸拱在自重作用、溫度荷載、重車荷載作用下的結構應力;模擬分析了三鉸拱的破壞過程。第三,對比了我國與美國在橋梁承載能力評定方法上的差異;基于實測最不利車輛荷載工況,依據(jù)規(guī)范規(guī)定的荷載組合進行了橋梁腹拱的承載能力評價。研究認為,空腹式石拱橋腹拱出現(xiàn)下?lián)襄e位現(xiàn)象的內(nèi)部原因在于拱頂拱鉸脆弱,外部原因在于超載現(xiàn)象嚴重及冬季低溫效應�；谏鲜鰞煞矫嬖�,本文提出加大立墻截面,改三鉸拱為兩鉸拱,增厚拱圈,更換拱腹伸縮縫等結構措施,有限元分析驗證該方案有效。另外,本文所研究橋梁的三鉸拱拱頂鉸功能已經(jīng)基本失效,拱圈對拱頂?shù)募s束能力較差,在重車作用時,拱頂下?lián)蠂乐�。交通調(diào)查數(shù)據(jù)檢驗了本文主要結論。通過連續(xù)24小時的交通流調(diào)查發(fā)現(xiàn),車速統(tǒng)計規(guī)律符合正態(tài)分布,車重的統(tǒng)計規(guī)律基本符合伽馬分布。經(jīng)計算,在最不利車輛荷載工況下,加固后的橋梁四分點和拱頂截面的承載能力滿足要求。
[Abstract]:With the traffic volume and vehicle load increasing year by year, the early stone arch bridge is overloaded and various kinds of diseases occur. As an important coal transportation channel in Shanxi Province, the traffic volume of National Highway G208 is busy, and there are serious overload problems. Because the overloading of the automobile brings serious hidden trouble to the use function and safety function of the bridge, it is of great practical significance to detect and strengthen the bridge with problems. Taking the maintenance and reinforcement of a hollow stone arch bridge in Shanxi Coal Transportation Channel of National Highway G208 as an example, this paper analyzes the main diseases of the bridge and puts forward a targeted reinforcement scheme. The mechanical analysis of each stage before and after strengthening the bridge is carried out based on finite element method, and the bearing capacity of the strengthened bridge is evaluated based on the measured traffic volume of 24 hours. The research focuses on three aspects. Firstly, the concrete disease situation of the hollow stone arch bridge is analyzed, the internal and external causes of the disease are determined, and the targeted reinforcement design scheme is put forward. Secondly, based on the finite element analysis software of MIDAS, the finite element model of the whole bridge is established, and the finite element simulation analysis of each stage of reinforcement is carried out, and the displacement value of the bridge structure under the action of temperature and live load is given. The structural stress of three-hinged arch and two-hinged arch under the action of self-gravity, temperature load and heavy truck load is compared, and the failure process of three-hinged arch is simulated and analyzed. Thirdly, the difference between China and the United States in the evaluation method of bridge bearing capacity is compared, and the load-carrying capacity of the bridge web arch is evaluated according to the load combination stipulated in the code, based on the most unfavorable vehicle load conditions measured. It is considered that the internal cause of the downward deflection of the belly arch of the hollow stone arch bridge is the weakness of the arch hinge on the top of the arch, and the external reason is the serious overloading phenomenon and the effect of low temperature in winter. Based on the above two reasons, this paper puts forward some structural measures, such as enlarging the section of vertical wall, changing the three-hinge arch to two hinged arch, thickening the arch ring and replacing the expansion joint of the arch belly, etc. The finite element analysis shows that the scheme is effective. In addition, the arch hinge function of the bridge studied in this paper has basically failed, and the restraint ability of the arch ring to the vault is poor, and the deflection under the arch roof is serious when the heavy car is used. Traffic survey data test the main conclusions of this paper. Through the investigation of traffic flow for 24 hours, it is found that the law of speed statistics accords with the normal distribution, and the statistical law of vehicle weight basically accords with the distribution of gamma. Through calculation, under the most unfavorable vehicle load condition, the bearing capacity of the strengthened bridge at four points and the section of the arch roof can meet the requirements.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.72
[Abstract]:With the traffic volume and vehicle load increasing year by year, the early stone arch bridge is overloaded and various kinds of diseases occur. As an important coal transportation channel in Shanxi Province, the traffic volume of National Highway G208 is busy, and there are serious overload problems. Because the overloading of the automobile brings serious hidden trouble to the use function and safety function of the bridge, it is of great practical significance to detect and strengthen the bridge with problems. Taking the maintenance and reinforcement of a hollow stone arch bridge in Shanxi Coal Transportation Channel of National Highway G208 as an example, this paper analyzes the main diseases of the bridge and puts forward a targeted reinforcement scheme. The mechanical analysis of each stage before and after strengthening the bridge is carried out based on finite element method, and the bearing capacity of the strengthened bridge is evaluated based on the measured traffic volume of 24 hours. The research focuses on three aspects. Firstly, the concrete disease situation of the hollow stone arch bridge is analyzed, the internal and external causes of the disease are determined, and the targeted reinforcement design scheme is put forward. Secondly, based on the finite element analysis software of MIDAS, the finite element model of the whole bridge is established, and the finite element simulation analysis of each stage of reinforcement is carried out, and the displacement value of the bridge structure under the action of temperature and live load is given. The structural stress of three-hinged arch and two-hinged arch under the action of self-gravity, temperature load and heavy truck load is compared, and the failure process of three-hinged arch is simulated and analyzed. Thirdly, the difference between China and the United States in the evaluation method of bridge bearing capacity is compared, and the load-carrying capacity of the bridge web arch is evaluated according to the load combination stipulated in the code, based on the most unfavorable vehicle load conditions measured. It is considered that the internal cause of the downward deflection of the belly arch of the hollow stone arch bridge is the weakness of the arch hinge on the top of the arch, and the external reason is the serious overloading phenomenon and the effect of low temperature in winter. Based on the above two reasons, this paper puts forward some structural measures, such as enlarging the section of vertical wall, changing the three-hinge arch to two hinged arch, thickening the arch ring and replacing the expansion joint of the arch belly, etc. The finite element analysis shows that the scheme is effective. In addition, the arch hinge function of the bridge studied in this paper has basically failed, and the restraint ability of the arch ring to the vault is poor, and the deflection under the arch roof is serious when the heavy car is used. Traffic survey data test the main conclusions of this paper. Through the investigation of traffic flow for 24 hours, it is found that the law of speed statistics accords with the normal distribution, and the statistical law of vehicle weight basically accords with the distribution of gamma. Through calculation, under the most unfavorable vehicle load condition, the bearing capacity of the strengthened bridge at four points and the section of the arch roof can meet the requirements.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.72
【相似文獻】
相關期刊論文 前10條
1 傅木森;;尤溪洲閩江大橋空腹式剛架拱施工技術[J];福建建筑;2006年04期
2 郭友;;鄂爾多斯市緯三路西橋空腹式剛架拱結構設計[J];中國市政工程;2012年05期
3 閆小翠;王正民;彭志苗;;龍峽谷大橋空腹式連續(xù)剛構施工過程仿真分析[J];公路交通科技(應用技術版);2012年04期
4 韓洪舉;黃坤全;;290m空腹式剛構橋三角區(qū)施工技術[J];橋梁建設;2011年03期
5 李俊;;空腹式連續(xù)剛構斜腿施工工法[J];黑龍江交通科技;2014年04期
6 湯肇安;空腹式井架的應力分析[J];煤礦設計;1983年02期
7 許廣生;少筋無肋空腹式輕質混凝土雙曲拱橋使用情況調(diào)查[J];黑龍江交通科技;1995年03期
8 徐家興;;等截面懸鏈線空腹式石拱橋設計中的規(guī)律性[J];公路;1982年12期
9 杜永超;;空腹式鋼筋混凝土連拱橋結構計算與設計研究[J];山西建筑;2014年09期
10 曾凡奎;張雅維;李建國;;在役空腹式混凝土板拱荷載試驗[J];西安工業(yè)大學學報;2013年10期
相關會議論文 前2條
1 鄧良強;孫建淵;;公路空腹式預應力型鋼混凝土梁的構造與承載力分析研究[A];第十八屆全國橋梁學術會議論文集（下冊）[C];2008年
2 張s，
本文編號：2376112
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2376112.html
