Cause analysis of cracking on the top of curved prestressed concrete bridge piers
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摘要: 為研究預應力連續彎梁橋墩頂開裂或主梁側傾的原因,將預應力鋼束對混凝土梁的作用簡化為等效荷載,用三維梁單元對預應力張拉施工過程進行了有限元模擬．對采用墩梁固結的預應力彎梁橋進行計算的結果表明,張拉時所引起的獨柱墩頂彎矩的方向和自重引起的彎矩方向相同,并大一個數量級,此二者共同作用是造成預應力混凝土連續彎梁橋墩頂開裂或主梁側傾事故的原因．并通過對比計算,提出了預防墩頂開裂的建議．Abstract: An FEM simulation using three-dimensional beam element was performed in order to study the causes of cracking on the top of curved prestressed concrete girder bridge piers, where the prestressing tendons were simplified as forces acting on the concrete girder. The results indicate that the direction of moment on the top of a single pillar pier caused by prestressing and that caused by dead load are identical, and the former is 1 order of magnitude higher. These two moments are the main causes of cracking on the top of the piers. By comparative computation, applicable suggestions were proposed to prevent the cracking of a pier.
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Key words:
- prestressed concrete /
- curved bridge /
- pier /
- equivalent load /
- cracking
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