论文部分内容阅读
研究目的:为超大跨度斜拉桥抗风设计与抖振控制提供参考。研究方法:基于ANSYS建立了苏通大桥三维有限元模型,并在MATLAB平台模拟了苏通大桥三维脉动风场。考虑主梁断面气动自激力,进行了苏通大桥抖振时域分析。根据苏通大桥动力特性和抖振时域分析结果,重点分析了多重调谐质量阻尼器(MTMD)用于抖振控制的参数敏感性。考虑MTMD的控制效果、建造费用、施工难度及鲁棒性等因素建立了关于MTMD设计参数的目标函数,并基于一阶优化算法进行目标函数最优解的非线性搜索,据此获得了MTMD在约束条件下的最优设计参数。重要结论:1.苏通大桥侧向抖振位移主要由第一阶侧弯振型控制,竖向抖振位移主要由第一阶竖弯振型控制;2.MTMD的控制效果对设计参数的变化十分敏感,其中质量比和频带宽敏感性更强;3.MTMD的最优设计参数可以通过一阶优化算法获得,并可通过零阶优化算法对优化结果进行验证;4.采用优化后的MTMD设计参数,苏通大桥的抖振响应可以得到明显抑制,且侧向抖振控制效果更加明显。
Research purposes: Provide references for wind-resistant design and chattering control of super-long span cable-stayed bridges. Research Methods: The three-dimensional finite element model of Sutong Bridge was established based on ANSYS. The three-dimensional fluctuating wind field of Sutong Bridge was simulated on MATLAB platform. Considering the aerodynamic self-excitation of the main beam section, the buffeting time-domain analysis of Sutong Bridge was carried out. According to the dynamic characteristics of Su Tong Bridge and the buffeting time-domain analysis, the parameter sensitivity of multi-tuned mass damper (MTMD) for buffeting control is analyzed emphatically. Considering the control effect of MTMD, construction cost, construction difficulty and robustness, the objective function of MTMD design parameters is established. Based on the first-order optimization algorithm, the nonlinear optimal search of the objective function is obtained. Optimal Design Parameters under Constraints. Important conclusions: 1. The lateral chattering displacement of Sutong Bridge is mainly controlled by the first-order bending mode, and the vertical chattering displacement is mainly controlled by the first-order vertical bending mode. 2. The effect of the control of the TMD on the design parameters The change is very sensitive, the quality is more sensitive than the frequency bandwidth; 3.MTMD optimal design parameters can be obtained by the first-order optimization algorithm, and can be optimized by the zero-order optimization algorithm to verify; 4. Using the optimized MTMD design parameters, Sutong Bridge buffeting response can be significantly suppressed, and lateral buffeting control effect is more obvious.