預應力混凝土空心板加固試驗研究
發(fā)布時間：2018-11-25 12:00
【摘要】： 鋼筋混凝土簡支梁橋長期以來是我國的主導橋型,由于其設(shè)計簡單,施工簡便,為我國經(jīng)濟發(fā)展時期的常采用的形式。但是由于設(shè)計、施工、養(yǎng)護的原因和設(shè)計標準的改變,加之交通量的急劇增加、大型載重車輛和超載車輛的因素,在役的簡支鋼筋混凝土橋梁已經(jīng)出現(xiàn)不同程度的缺陷和損傷,因此對在役橋梁的結(jié)構(gòu)檢測和承載力的評定與提高迫在眉睫。 本文首先對未加固的空心板相關(guān)指標以及結(jié)構(gòu)理論承載能力等進行了系統(tǒng)的檢測、計算和理論研究分析,并通過未加固的預應力混凝土空心板破壞荷載試驗研究,對空心板受荷破壞機理和極限承載能力進行評定。以此為基礎(chǔ),分別采用受壓區(qū)加大截面法和受拉區(qū)粘貼碳纖維布的方法對預應力混凝土空心板進行加固,并通過加固后的預應力混凝土空心板的破壞荷載試驗研究,探討不同結(jié)構(gòu)補強措施對舊橋預應力混凝土空心板極限承載力、受荷破壞機理等的影響,并提出合理可行的舊橋預應力混凝土空心板加固補強方案及相關(guān)建議。結(jié)合有限元思想,分別采用MIDAS和ANSYS計算程序?qū)Y(jié)構(gòu)進行內(nèi)力計算分析,與試驗結(jié)果符合比較一致,兩種加固補強措施對結(jié)構(gòu)承載力都有不同程度的提高,進一步論證了對于目前中小跨徑橋梁,基于“單板受力”的情況采用這兩種加固方法加固的實用性和可靠性,為舊橋加固施工提供了依據(jù)和理論基礎(chǔ)。
[Abstract]:The reinforced concrete simply supported beam bridge has been the dominant bridge type in China for a long time. Because of its simple design and simple construction, it is often adopted in the period of our country's economic development. However, due to the changes in design, construction, maintenance and design standards, as well as the sharp increase in traffic volume, and the factors of large load vehicles and overloaded vehicles, the simply supported reinforced concrete bridges in service have appeared various degrees of defects and injuries. Therefore, it is urgent to evaluate and improve the structure and bearing capacity of existing bridges. In this paper, the relevant indexes of unreinforced hollow slabs and the theoretical bearing capacity of the structures are systematically tested, calculated and analyzed, and the failure load test of unreinforced prestressed concrete hollow slabs is carried out. The failure mechanism and ultimate bearing capacity of hollow slabs are evaluated. On this basis, the prestressed concrete hollow slabs are strengthened by the method of increasing the section under compression and the method of affixing carbon fiber sheets to the tensile areas, and the experimental study on the failure load of the strengthened prestressed concrete hollow slabs is carried out. This paper discusses the influence of different structural reinforcement measures on the ultimate bearing capacity and failure mechanism of prestressed concrete hollow slabs of old bridges, and puts forward some reasonable and feasible reinforcement schemes and relevant suggestions for prestressed concrete hollow slabs of old bridges. Combined with the idea of finite element method, the internal force of the structure is calculated and analyzed by MIDAS and ANSYS program, which is consistent with the test results. The two reinforcement measures can improve the bearing capacity of the structure in different degrees. This paper further demonstrates the practicability and reliability of these two reinforcement methods for small and medium span bridges based on the condition of "single slab force", which provides the basis and theoretical basis for the reinforcement of old bridges.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2007
【分類號】：U446.1
本文編號：2356024
[Abstract]:The reinforced concrete simply supported beam bridge has been the dominant bridge type in China for a long time. Because of its simple design and simple construction, it is often adopted in the period of our country's economic development. However, due to the changes in design, construction, maintenance and design standards, as well as the sharp increase in traffic volume, and the factors of large load vehicles and overloaded vehicles, the simply supported reinforced concrete bridges in service have appeared various degrees of defects and injuries. Therefore, it is urgent to evaluate and improve the structure and bearing capacity of existing bridges. In this paper, the relevant indexes of unreinforced hollow slabs and the theoretical bearing capacity of the structures are systematically tested, calculated and analyzed, and the failure load test of unreinforced prestressed concrete hollow slabs is carried out. The failure mechanism and ultimate bearing capacity of hollow slabs are evaluated. On this basis, the prestressed concrete hollow slabs are strengthened by the method of increasing the section under compression and the method of affixing carbon fiber sheets to the tensile areas, and the experimental study on the failure load of the strengthened prestressed concrete hollow slabs is carried out. This paper discusses the influence of different structural reinforcement measures on the ultimate bearing capacity and failure mechanism of prestressed concrete hollow slabs of old bridges, and puts forward some reasonable and feasible reinforcement schemes and relevant suggestions for prestressed concrete hollow slabs of old bridges. Combined with the idea of finite element method, the internal force of the structure is calculated and analyzed by MIDAS and ANSYS program, which is consistent with the test results. The two reinforcement measures can improve the bearing capacity of the structure in different degrees. This paper further demonstrates the practicability and reliability of these two reinforcement methods for small and medium span bridges based on the condition of "single slab force", which provides the basis and theoretical basis for the reinforcement of old bridges.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2007
【分類號】：U446.1
【引證文獻】
相關(guān)碩士學位論文 前1條
1 顏苓;新型預應力體系加固橋梁[D];華南理工大學;2011年
，本文編號：2356024
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