锚具变形产生的预应力损失计算

Calculation for Prestress Losses Due to Deformation of Anchorage Device

针对后张法预应力混凝土构件中由锚具变形、预应力钢束回缩和接缝压缩等引起的预应力损失计算方法适用范围较窄和误差较大的缺点,基于变形协调条件,通过分段近似计算方法,建立了锚具变形、预应力钢束回缩和接缝压缩等引起的预应力损失计算公式,并与实际预应力混凝土T形截面简支梁的计算结果进行了比较。结果表明,该公式具有计算精度高、适用范围广的优点,特别适用于预应力孔道线形复杂的构件,既易于编制计算程序又可简单地在Excel上完成计算。

According to the post-tensioning method in prestressed concrete members,the calculation method of prestress losses caused by the deformation anchorage device,slip of tendon and joint compression was big in the error and narrow in the scope of application.Based on the condition of deformation compatibility,the computing formula of prestress losses caused by deformation of anchorage device,slip of tendon and joint compression was established by using calculation method of piecewise approximation,meanwhile,the calculation result was compared with the simple T-beam of prestressed concrete.The result shows that the formula is high in precision and wide in applicability.It is apt to work out calculation procedure and can complete the calculation at Excel simply,especially it adapts the member of which its prestressed duct has complex alignment.