最优控制法对斜拉桥索力的控制机制
Optimal Control Method for the Control Mechanism of Cable Force for Cable-Stayed Bridge

由于外海海域工程环境的特殊性，对于施工过程中斜拉索索力的控制需要考虑风力、湿度、日照以及温度等多种因素影响，如何确定合理的索力施工控制机制成为斜拉桥施工过程中最主要的问题之一，影响到后续斜拉索挂索施工甚至后期梁段合拢，因此需要通过综合多种控制方法控制实际施工索力来满足控制需求。最优控制法通过多方数据比对，综合运用振动频率法建立现场实测频率与索力值的换算方程、计算千斤顶油压与索力的回归关系以及建立拉索端引伸量与索力的等效数学关系，从而对索力进行复核和控制。当施工阶段出现误差，需要调整索力时，调整量通过最优控制法计算确定，从而实现对施工过程中索力的精细化控制。
Due to the particularity of the engineering environment in the open sea, the control of the cable force during the construction process needs to consider the influence of wind, humidity, sunshine, temperature and other factors. How to determine a reasonable cable force construction control mechanism becomes one of the most important problems during the cable-stayed bridge construction process, which affects the subsequent cable-stayed construction and even the later closing of the beam section. Therefore, it is necessary to control the actual construction cable force through a comprehensive variety of control methods to meet the control requirements. The optimal control method uses the vibration frequency method to check and control the cable force, such as to establish the conversion equation between the measured frequency and the cable force value, calculates the regression relationship between the jack oil pressure and the cable force, and establishes the equivalent mathematical relationship of the cable end extension and the cable force. When there is an error in the construction stage and the cable force needs to be adjusted, the adjustment amount is calculated and determined by the optimal control method, so as to realize the fine control of the cable force during the construction process.