新型组合结构高墩的静力学分析方法

特大跨桥梁的塔柱以及超高桥梁的墩柱通常采用薄壁截面形式，以克服自重过大的问题。当薄壁墩柱遭遇强地震作用时，通过墩柱产生塑性铰来耗散地震能量，保护整体结构的安全性。但薄壁墩柱存在耗能能力有限、修复困难的缺陷，为便于概念设计，通过对该结构体系进行力学简化，使用连续连杆法对受力特征进行分析，建立了相应的力法方程并对其理论求解方法进行推导；根据位移等效原则，求解出顶部受集中力的悬臂墩等效惯性矩，便于计算顶部位移；提出了比例参数的概念，用于结构构件进行参数优化，可方便、有效地实现结构的力学性能设计；为验证连续连杆法、等效惯性矩计算方法的可靠性，进行了有限元数值分析。研究结果表明：解析解与试验结果及有限元分析结果吻合较好；提出的新型自耗能高墩兼具较大的耗能能力和可恢复性的优势；采用连续连杆法分析新型自耗能高墩结构体系的内力和位移是可行的。所得结果对新型自耗能高墩结构体系的设计具有指导性，利用等效惯性矩求解结构的顶点位移可以很好地满足设计精度要求。

Static Analysis Method of New Composite High Pier Structure

The columns of extra long-span bridges and pier columns of super tall bridges are usually designed with thin-walled sections to overcome the problem of excessive weight of the tower column and pillar. When encountering a strong earthquake, the thin-walled pier columns generate plastic hinges to dissipate seismic energy, which can ensure the safety of the whole structure. However, thin-walled pier columns have limited energy dissipation and repairing difficulties. In order to facilitate the concept design, the mechanics of this structural system were simplified. Then, the continuous link method was used to analyze the mechanical properties. Afterwards, the corresponding mechanics equation was established, and the theoretical solution was derived. Based on the principle of displacement equivalence, the equivalent inertial moment of the cantilever pier with a concentrated force was solved, which was convenient for top displacement calculation. The proposed concept of proportional parameters was used to optimize the parameters of the structural components. This can easily and effectively realize mechanical property design of the structure. Finite element numerical analyses were carried out to verify the reliabilities of the continuous link method and equivalent inertial moment calculation method. The results show that the analytical solutions are in good agreement with the results of the model experiments and finite element analysis results. The new high pier structure system with self-dissipating energy capability has the advantages of both high energy dissipation and recoverability. It is feasible to analyze the internal force and displacement of the new high pier structure system with self-dissipative energy capacity by the continuous link method, and the results are instructive for the design of new high pier structure systems with this property. Using the equivalent inertial moment to solve the structure of the vertex displacement can help meet the accuracy requirements.