本文關鍵詞：PC連續(xù)箱梁0#塊構造分析及力學性能研究　出處：《南昌大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： PC連續(xù)箱梁 0#塊 力學性能 構造尺寸 配筋率

【摘要】：近數(shù)十年來,預應力混凝土連續(xù)剛構橋在我國大規(guī)模應用于交通建設中。但是經(jīng)實際統(tǒng)計發(fā)現(xiàn),很多橋梁都有不同程度的病害,尤其是0#塊部位,容易產(chǎn)生多種裂縫,橋梁的耐久性遭受嚴重破壞。本文統(tǒng)計現(xiàn)有擬建連續(xù)剛構橋圖紙,分析統(tǒng)計并總結主跨100m左右的PC連續(xù)箱梁0#段箱梁截面的構造尺寸特點以及各構件的配筋率范圍。以某預應力連續(xù)剛構橋為工程背景,通過建立0#段精細化的空間有限元模型并進行彈性計算,分析研究0#段空間應力分布規(guī)律,認定最大懸臂施工階段為最不利階段。對某大橋進行構造尺寸等參數(shù)進行受力敏感性分析,得出參數(shù)變化時各構件詳細的應力變化情況。并依據(jù)統(tǒng)計結果得到較合理的構造尺寸。針對100m連續(xù)剛構橋,0#塊高度可以取為5.8m、6m;腹板厚為70cm~80cm,底板厚為80cm~100cm。對0號段進行空間塑性受力分析,模擬0#段開裂位置的裂縫發(fā)展過程。并對各構件的配筋率做敏感性分析,得出了不同配筋率時各構件受力的變化。增加配筋率對結構應力分布影響較小。100m連續(xù)剛構橋0#塊各構件配筋率可依據(jù)統(tǒng)計結果和規(guī)范擬定出合理范圍。
[Abstract]:In recent decades, prestressed concrete continuous rigid frame bridge has been widely used in traffic construction in China. However, it is found that many bridges have different degrees of disease, especially in the part of 0#. It is easy to produce a variety of cracks, and the durability of the bridge is seriously damaged. This paper makes statistics on the existing drawings of the proposed continuous rigid frame bridge. This paper analyzes and summarizes the structural size characteristics of the section of PC continuous box girder with a main span of 100 m or so and the range of reinforcement ratio of each member. Taking a prestressed continuous rigid frame bridge as the engineering background. By establishing a fine spatial finite element model of 0# segment and carrying out elastic calculation, the spatial stress distribution law of 0# section is analyzed and studied. The maximum cantilever construction stage is considered as the most disadvantageous stage. The structural dimensions and other parameters of a bridge are analyzed for the stress sensitivity. According to the statistical results, the reasonable structural size is obtained. The height of the block of 100m continuous rigid frame bridge can be taken as 5.8 mb or 6m. The thickness of web is 70 cm / m ~ (80) cm, and the thickness of bottom plate is 80 cm ~ (10) cm. The spatial plastic force of section 0 is analyzed. The crack development process at the crack location of 0# section is simulated and the sensitivity analysis of the reinforcement ratio of each component is made. The influence of reinforcement ratio on the stress distribution of the structure is less. 100m continuous rigid frame bridge with different reinforcement ratio can draw up a reasonable range according to the statistical results and specifications. .
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441

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