【作者】 俞志松；

【导师】 刘勇； 欧新新；

【作者基本信息】 浙江工业大学 ， 固体力学， 2003， 硕士

【摘要】 预应力混凝土楼盖方案是解决大空间建筑物楼盖布置和高层建筑电、暖设施合理铺设的较佳选择。传统的计算理论和方法在复杂的现代结构上的应用面临新的挑战，虽然计算机辅助设计已经成为公认的解决手段，但计算理论与计算机结合的有效途径仍有待进一步的深入研究。 本文在对预应力筋对楼盖结构作用本质进行深入分析的基础上，采纳有限元分析理论，并与大型商用有限元软件ANSYS相结合，提出了考虑预应力筋有效预应力不均匀变化、可适用于异形楼盖的预应力筋等效分析模型。经与已有文献研究的实际试验数据比较证明该等效分析模型应用于实际结构分析是正确可行的。最后，利用本研究提出的等效分析模型对预应力筋布筋间距及布筋形式对预应力效应的影响进行了计算探讨分析，发现在一定范围内布筋间距对预应力效应的影响可以忽略不计，在跨中一定范围内集中布筋具有一定的优越性。更多还原

【Abstract】 Unbonded prestressed floorslab structure is a sound choice to satisfy the requirements of structure arrangement for big space buildings and installment of air and electric equipment. Traditional numerical theories and methods face new challenge when confronted with complex modern structures. Though computer aid design has been accepted as a good way for problem solution, the efficient way to combine the theory with the computer is expected to get further progress.In this paper, from the analysis of the nature of prestressing tendons acting on floorslab, an equivalent model of prestressing tendons is described, which is based on the FEM theory and integrated to the FEMsoftware-ANSYS. The model takes the change of effective prestressalong the tendons into account and is applicable to abnormal shape slab. The validity of the model is verified by comparison with the experiment result data provided by previous research paper. At last, the discussion of the influence of space and form of tendon distribution to the prestressing effect is carried out. And as a result, it is believed that the influence oftendons distribution space can be ignored in certain range and it will have more advantages to place prestressing tendons centrally in the middle strip of floorslab.更多还原