自锚式悬索桥分部位校验系数合理取值研究

Study on the Reasonable Value of Substation Check Coefficient of Self-anchored Suspension Bridge

校验系数是评判桥梁承载力的一个重要指标,一般地,当η≤1表明结构承载力满足规范要求,工作性能较好。自锚式悬索桥受力特点较传统地锚悬索桥更为复杂,且该桥型荷载试验工程经验相对较少,有必要开展该桥型分部位校验系数研究。通过查阅相关文献及资料,基于统计学方法开展主塔、主梁、主缆、吊杆四大构件分部位校验系数合理取值分析,涉及主梁应变、主梁挠度、吊索索力增量、主缆内力增量、塔偏、主塔应变六项关键指标,分别建立了优、良、中、差、劣不同等级的区间范围。

The calibration coefficient is an important index for judging the bearing capacity of a bridge. Generally, when η≤1, it indicates that the bearing capacity of the structure meets the requirements of the specification and the working performance is good. The mechanical characteristics of self-anchored suspension bridges are more complicated than traditional ground-anchored suspension bridges, and there is relatively little experience in the load test engineering of this bridge type. It is necessary to carry out a study on the calibration coefficients of this bridge type by part. By consulting relevant literature and data, based on statistical methods, the analysis of the reasonable value of the calibration coefficients of the four major components of the main tower, the main beam, the main cable and the boom is carried out, involving the strain of the main beam, the deflection of the main beam, and the increase in the sling cable force. The six key indicators of main cable internal force increment, tower deviation, and main tower strain have established ranges of different grades of excellent, good, medium, poor, and inferior respectively.