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中文摘要：
基于Chopra解决逆转现象的方法提出了最优目标控制参数概念,阐述了最优目标控制参数的理论意义和选取原则.以某上海长江大桥高桩承台体系为研究对象,实施了选取最优目标控制参数分析过程,并对该高桩承台体系进行一阶模态推倒分析、多模态推倒分析（MPA）和非线性动力时程分析.结果表明：选取最优目标控制参数可有效解决高桩承台体系在MPA分析中所遇到的逆转现象,采用最优目标控制参数进行MPA分析得到的位移响应与非线性时程分析结果精度接近,远优于一阶模态推倒分析的结果.
英文摘要：
A theory of best control parameters （BCP） is developed based on Chopra＇s approach to tackle the problem. Theoretical derivation and selection principle of BCP are also presented. A modal pushover analysis （MPA） of a pile foundation from Shanghai Changjiang Bridge is then conducted by using the developed BCP approach. First-mode pushover analysis （Po-1） and nonlinear time-history analysis （THA） of the pile foundation system are also conducted as the reference. The following conclusions are drawn through a comparative study： the BCP selection method efficiently resolves the reversal phenomenon in MPA of the pile foundation system~ the displacement demands estimated by MPA with the selected BCP are closer to the results of THA, and much better than those provided by Po-1.
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