【摘要】：摘要：薄壁箱梁由于具有抗扭剛度大、自重輕、跨越能力大及施工方便等優(yōu)點,在現(xiàn)代橋梁中得到廣泛地應用,但薄壁箱梁存在剪力滯效應,對結構安全有影響。我國預應力混凝土連續(xù)箱梁橋大多采用懸臂施工法,施工過程中剪力滯效應突出,忽略施工過程中的剪力滯效應會使結構存在安全隱患。國內關于懸臂澆筑混凝土箱梁施工過程中梁體剪力滯效應的研究較少,本文針對這種狀況開展試驗與計算分析,主要研究內容如下： (1)在一座采用懸臂澆筑施工的預應力混凝土箱梁橋的一個截面的頂、底板設置多個應變傳感器,監(jiān)測施工中梁體自重、掛籃自重、混凝土澆筑、預應力張拉等工況下截面的應力。 (2)分析了不同工況下箱梁頂、底板實測應力沿橫向分布情況,討論了實測應力的剪力滯規(guī)律。 (3)采用空間有限元分析軟件,模擬計算了箱梁頂?shù)装鍛υ趹冶凼┕るA段的剪力滯效應,與實驗數(shù)據(jù)進行了對比分析。 (4)采用空間有限元分析軟件,模擬并分析了箱梁最大懸臂狀態(tài)下沿橋梁跨度方向剪力滯變化情況,對剪力滯影響因素寬跨比進行深入探討。 (5)實測并分析了環(huán)境溫度變化引起的溫度效應對剪力滯的影響。
[Abstract]:Abstract: Thin-walled box girder is widely used in modern bridges because of its high torsional stiffness, light deadweight, large span capacity and convenient construction, but the shear lag effect exists in thin-walled box girder, which has an impact on structural safety. The research on shear lag effect of cantilever concrete box girder in the construction process is less in China. This paper carries out the test and calculation analysis for this situation. The main research contents are as follows:
(1) On the top of one section of a prestressed concrete box girder bridge constructed by cantilever casting, a plurality of strain sensors are installed on the bottom plate to monitor the stress of the section under the conditions of girder weight, hanging basket weight, concrete pouring and prestressed tension.
(2) The transverse distribution of measured stress along the top and bottom of box girder under different working conditions is analyzed, and the shear lag law of measured stress is discussed.
(3) The shear lag effect of box girder roof and floor stress during cantilever construction is simulated and analyzed by using the spatial finite element analysis software.
(4) The variation of shear lag along the span direction of box girder under the maximum cantilever state is simulated and analyzed by using the spatial finite element analysis software, and the influencing factors of shear lag width-span ratio are discussed in depth.
(5) measured and analyzed the effect of temperature effect caused by environmental temperature change on shear lag.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445;U441.5

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