大跨曲线钢箱梁桥可调测力支座研究与应用

Research and Application of Adjustable Force-Measuring Bearings for Long-Span Curved Steel Box Girder Bridges

摘要:

深圳市妈湾跨海通道工程金港大桥主桥采用65 m+90 m+65 m单箱双室变梁高曲线连续钢箱梁结构，主梁位于平面半径为255 m的圆曲线、缓和曲线及直线上。金港大桥是典型的大跨曲线钢箱形梁结构，具有复杂的空间结构特征，为了解荷载作用下支座反力情况，优化内力分配，采用有限元计算软件MIDAS Civil 进行分析，并采用可调测力支座监测、调节支座反力，以达到主梁受力较优的状态，结果表明：支座高度调节对结构反力的影响敏感，可通过调节支座高度优化结构受力状态；测力支座监测数据可有效反映结构的实际反力情况，与计算结果差值小于10%；可调测力智能支座在大跨曲线钢箱梁桥上的应用，对其监测和运维工作有积极作用。

Abstract:

The main bridge of Jingang Bridge in the Shenzhen Mawan Cross-Sea Corridor Project is a 65 m+90 m+65 m single-box double-cell curved continuous steel box girder structure with variable girder depth. The main girder is located on a circular curve with a plane radius of 255 m, a transition curve and a straight line. The bridge is a typical long-span curved steel box girder structure with complex spatial structural characteristics. To understand the bearing reaction under load action, the internal force distribution is optimized. The finite element calculation software MIDAS Civil is used for analysis. Meanwhile, the adjustable load-measuring bearings are adopted to monitor and adjust the bearing reaction so as to achieve a better stress state of the main girder. The results show that the bearing height adjustment is sensitive to the influence of structural reaction, and the structural stress state can be optimized by adjusting the bearing height. The monitoring data of the load-measuring bearings can effectively reflect the actual structural reaction, and the difference from the calculation result is less than 10%. The application of adjustable load-measuring intelligent bearings in long-span curved steel box girder bridges plays a positive role in the monitoring, operation and maintenance work.