基于单梁试验下的预制T梁起拱度分析及控制研究

Analysis and Control Study of Prefabricated T-beam Arching Based on Single Girder Test

为解决预制T梁在生产过程中起拱度精度控制不足的问题,使用百分表对T梁张拉期的起拱度进行全周期监测,并通过理论计算得到预制T梁构件在张拉期增长的起拱度理论值,将监测数据与理论进行相互验证,然后根据预制T梁构件在张拉期、灌浆期和存梁期过程中起拱度的变化情况,分析影响预制T梁起拱度发生变化的主要因素。结果表明,1)张拉期T梁起拱度的监测数据与理论计算结果相吻合;2)张拉期张拉控制应力的设置过高以及在存梁期未采用有效的隔温措施会较大地影响预制T梁起拱度的精确控制。研究结果为预制T梁起拱度精确控制提供了重要参考。

In order to solve the problem of insufficient precision control of the arching degree of prefabricated T-beam in the production process,this paper uses the percentage meter to monitor the arching degree of T-beam in the tensioning period of the full cycle,and through theoretical calculations to get the theoretical value of arching degree of prefabricated T-beam members in the growth of the tensioning period,and the monitoring data and theory are verified with each other.Then,according to variations in arching degree of prefabricated T-beam members in the process of the tensioning period,the grouting period,and the storage period,the main factors affecting the change of the arching degree of prefabricated T-beam members are analyzed.The results show that:1)the full-cycle monitoring data during the tensioning period coincide with the theoretical calculation results;2)the setting of tension control stress is too high during the tensioning period and the failure to adopt effective insulation measures during the storage period will greatly affect the precise control of the arching degree of precast T-beam.The results of the study provide an important reference for the precise control of the arching degree of precast T-beams.