【摘要】 为尽快确定某重点工程Y形墩盖梁的裂缝处治方案，以减小施工延误、经济损失和社会影响，结合有限元法，对混凝土开裂机理及影响进行研究，并分析不同有限元模型的有效性。分析结果表明，有限元模拟的混凝土拉应力与实测裂缝的位置、方向、深度高度吻合；对于盖梁表面的水平横向和竖向裂缝，水化热是最主要影响因素，而收缩和支架沉降的影响可以忽略不计；预应力和上部荷载作用对盖梁混凝土早期裂缝影响很小且大致相互抵消，裂缝处治宜在张拉盖梁预应力之后进行。更多还原

【Abstract】 In order to determine the crack treatment scheme of Y-shaped pier cap beam of a key project as soon as possible to reduce construction delay, economic loss and social impact, the mechanism and influence of concrete cracking were studied, and the effectiveness of different finite element models was analyzed.The analysis results show that the tensile stress of concrete simulated by finite element method is highly consistent with the location, direction and depth of the measured cracks.For the horizontal transverse and vertical cracks on the surface of the cap beam, the hydration heat is the most important influencing factor, while the influence of shrinkage and support settlement can be neglected.The prestress and the superstructure’s load have little effect on the early cracks of the cover beam concrete and generally offset each other.The crack treatment should be carried out after the tensioning construction of cover beam.更多还原