在试验的基础上，对竖向张拉法体外预应力简支梁挠度进行分析计算。分析其挠度下降原因，并深入研究反拱挠度，得到主要影响因素，即应力增量及二次效应。通过理论分析得到不同的计算公式对应力增量以及二次效应值的计算，最后考虑次要影响因素——预应力增量竖向分力的影响，三次优化计算反拱挠度，得到较为靠近试验值的挠度值。%Based on the test results, testing the vertical tension of the external prestressing simply supported beam for the analysis of deflection. Analyzing the reasons of deflection decline, and further the study of arch deflection. Point out the main influence factors, namely the stress increment and the second-order effect. Through the theoretical analysis to obtain the different calculation formula in the stress increment and the second-order effect of value calculation, and finally consider secondary influence factors--the influence of vertical prestress increment component, improve the calculation of arch deflection for three times, get more close to the experimental value of deflection.
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