南水北调工程某桥梁负弯矩预应力加固技术

Prestressed Strengthening Technology for Negative Bending Moment of a Bridge in South-to-north Water Transfer Project

南水北调中线工程某桥梁为保证箱梁连续端抗裂性能和负弯矩承载力满足设计要求,需对箱梁负弯矩钢束进行补强加固。介绍了具体的预应力加固工艺及步骤,及其所采取的配套措施,并对加固方案进行了理论分析和验算,确认了方案的可行性。

The strengthening of the beams with steel strands at the negative bending moment place is needed to meet the requirement of negative bending moment bearing capacity and crack resistance for a bridge in South-to-north Water Transfer Project. The prestressed strengthening process and steps is introduced,and the corresponding measures are applied. The theory analysis and calculation for this scheme are done. The result shows that this scheme is feasible.