预应力混凝土梁预应力损失及裂缝控制分析

ANALYSIS OF PRESTRESS LOSS AND CRACK CONTROL OF PRESTRESSED CONCRETE BEAM

预应力混凝土在我国得到了广泛的应用,然而由于技术水平、施工工艺以及其他一些因素的影响,造成预应力大量损失并产生裂缝,预应力大量损失和裂缝得不到有效控制已经成为了我们亟待解决的问题。本文首先分析了造成预应力损失的原因,总结了减少预应力损失和控制裂缝的相关措施,并且对前人提出的这些解决办法使用ANSYS进行数值模拟分析,得出采用超张拉法、二次升温养护法、避免曲线布设预应力钢筋等方法能够有效地降低预应力损失。

Prestressed concrete in our country has been widely used,but because of the level of construction technology and the impact of other factors,resulting in a large number of prestressing losses and cracks,cracks in prestressing substantial losses and the lack of effective control has become our urgent solved problem. This paper analyzes the causes of loss of prestressing,prestressing summarized reduce losses and crack control measures,and those raised by previous solutions using ANSYS numerical simulation analysis,the ultratensioning method,secondary heating conservation Act,avoid laying curve prestressed reinforcement and other methods can effectively reduce the loss of prestress.