Through one example of storey-adding engineering, combined with strain energy damping calculation method, this paper discusses the influence of damping ratio on the storey-adding structure. By the ANSYS software, this paper analyzes the column strengthening with reinforced concrete and puts forward more attention should be paid to shear problem on the combination of the old and new parts in the project design.%通过一加层工程实例，结合应变能阻尼比计算方法，探讨了阻尼比对加层结构的影响，通过ANSYS软件对增大截面法加固柱分析，提出了该工程设计时应该高度重视新旧结合面的抗剪问题。
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