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本文阐述的压力线法,是一种新型的预应力混凝土粱变位预估方法。这种方法是考虑梁承受着沿梁压力线图而不是沿力筋轨迹图的预压力,采用合理的递增时间段及一些简化假定去预估预应力混凝土梁的变位,因而.在实际分析计算中应用十分方便。文中对瞬时短期变位、长期变位、龄期修正等效弹性模量等的分析计算方法作了阐述.压力法可计算不同龄期的变位.也可计算总变位;主要适用于简支梁.亦可扩展用于连续梁及超静定结构的长期变位、
The pressure line method described in this paper is a new method of predicting the displacement of prestressed concrete beams. This method takes into account the fact that the beam is subjected to a pre-stress along the pressure profile of the girder rather than along the trajectory of the tendons, using reasonable incremental time periods and some simplifying assumptions to predict the displacement of the prestressed concrete girder. Thus, Calculation is very convenient. In this paper, the analysis and calculation methods such as the instantaneous short-term displacement, the long-term displacement and the age-modified equivalent elastic modulus are described. The pressure method can calculate the displacements at different ages and also calculate the total displacements; Beam extension can also be extended for the continuous beam and statically indeterminate long-term displacement,