【摘要】：本論文主要內容是先簡支后轉連續(xù)梁橋在施工過程當中的內力漸變研究和分析,包括以下幾個方面:(1)在施工過程當中,安放預制梁后形成的簡支梁與簡支轉連續(xù)之后形成的連續(xù)梁的變形及內力的變化,經(jīng)過分析得知,簡支轉連續(xù)梁較簡支梁,在跨中引起更小的位移,且彎矩較簡支梁分布更均勻;(2)在預制梁安放實現(xiàn)之后,就連續(xù)端濕接頭段張拉和橫隔梁澆筑銜接的先后順序從事討論,分別從定義不同的施工階段從事階段分析,得到的結論是先連續(xù)端濕接頭段澆筑張拉施工較先橫隔梁澆筑銜接更有利于結構式的受力和變形;(3)就連續(xù)端濕接頭段張拉的順序差別,從依次張拉、對稱張拉和間隔張拉三個方面進行討論,分別定義不同的施工階段從事模擬剖析,得知,間隔張拉更有助于結構的受力及成橋的長久使用;(4)混凝土的收縮徐變在預制梁開始到成橋后的長久時間內一直在發(fā)生著變化,只是收縮徐變的速率在逐漸減小,在此分別就存梁期和成橋后三年內的收縮徐變進行討論。就存梁期的時間進行分析,分成30天、60天、90天,剖析在這三個時間段內混凝土的收縮徐變對簡支梁的影響。經(jīng)過軟件模擬分析,結合施工進程及施工預算,30天存梁期更優(yōu)。(5)分析討論簡支連續(xù)梁橋施工實現(xiàn)后的1年、2年、3年內混凝土收縮徐變對成橋的影響。分析得知,混凝土的收縮徐變,在1年內對成橋的影響稍大,在成橋2年和3年的影響甚微,即混凝土收縮徐變的速率在下降。
[Abstract]:The main content of this paper is the research and analysis of the gradual change of internal force in the construction process of the simple support and then the continuous girder bridge, including the following aspects: (1) during the construction process, The deformation and the change of internal force of the simply supported beam and the continuous beam formed after the continuous transfer of the simple support beam are put into the prefabricated beam. The analysis shows that the simple supported continuous beam causes smaller displacement in the span than the simple supported beam. The moment distribution is more uniform than that of simply supported beam. (2) after the precast beam is installed and realized, the sequence of tensioning and pouring connection of the continuous end wet joint and the construction of the diaphragm beam are discussed, and the stage analysis is carried out from different construction stages, respectively. The conclusion is that the construction of continuous end wet joint section is more favorable to the stress and deformation of structure than that of the first connecting beam. (3) according to the sequence of continuous end wet joint segment tensioning, Three aspects of symmetrical tension and interval tension are discussed, and different construction stages are defined for simulation analysis. The spacer tensioning is more helpful to the force of the structure and the long-term use of the bridge. (4) the shrinkage and creep of concrete has been changing for a long time from the beginning of the prefabricated beam to the completion of the bridge, but the rate of shrinkage and creep is gradually decreasing. In this paper, the shrinkage and creep of beam storage period and three years after completion of the bridge are discussed respectively. The time of storing beam is analyzed, which is divided into 30 days, 60 days and 90 days, and the influence of concrete shrinkage and creep on simply supported beam in these three periods is analyzed. Through software simulation and analysis, it is better to save beam in 30 days combined with construction process and construction budget. (5) the influence of concrete shrinkage and creep on the completion of the bridge within 1 year, 2 years and 3 years after the construction of simply supported continuous beam bridge is analyzed and discussed. The analysis shows that the shrinkage and creep of concrete have a slight effect on the bridge in one year, but have little effect on the bridge in 2 and 3 years, that is, the rate of shrinkage and creep of concrete is decreasing.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.4

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相關碩士學位論文 前1條

1 李全林;日照下混凝土箱梁溫度場和溫度應力研究[D];湖南大學;2004年

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本文編號：2226336