上海轨道交通六号线缺索槽形梁试验分析

上海城市轨道交通六号线5标段施工中,由于混凝土振捣导致预应力波纹管破裂而使Wb06～Wb07跨孔梁一侧主梁预应力钢束无法张拉。为尽量减小由此造成的影响和损失,设计单位对该孔梁纵向预应力钢束张拉控制应力进行了调整。为验证变更设计效果,采用类比试验法对缺索梁和正常梁进行应力和应变测试对比分析。结果表明,该孔梁在变更设计的情况下其强度和刚度能满足安全正常工作的要求。

Test Analysis of Partially Untensioned U-shape Beams in Shanghai Rail Transit Line 6

In construction of Contract 5 of Shanghai Rail Transit Line 6, the tendons in one side of the main beam (Span Wb06~Wb07) is not able to be tensioned due to the corrugated pipe for tendons damaged by concrete vibration. To minimize the impact and loss, adjustment is made to the tensioned stress of longitudinal tendons in that span. It proves through a comparison test of that beam and a normal beam in stress and strain that the strength and rigidity of the beam can meet the requirements of safety and normal performance.