In this paper, the effect of outrigger on key seismic design parameters of tall buildings with braced or shear wall core is studied. Based on the results of modal response spectrum (MRS) and nonlinear time history (NLTH) analyses of 44 models with braced or wall core, discussed in the companion paper and pushover analysis and presented in this part, the effect of outrigger and its placement level on parameters of seismic design including response modification factor R, overstrength factor Ω₀, deflection amplification factor C_d, and damping ratio of structures are studied. New local measures for C_d and Ω₀ are proposed based on the NLTH results. It is observed that outrigger results in greater increase in strength and stiffness of structures with wall core than buildings with braced core, but decreases the ductility of both systems. The obtained R is less than the values given by the code in most cases. For the main structures without outrigger, using the code prescribed value for C_d underestimates the real displacement of the structures with wall core and overestimates it for those with braced core. Outrigger results in increasing C_d of structures with braced core and reduction of C_d in those with wall core. The considerable variation of two proposed measures for C_d shows the inappropriateness of application of a single value of C_d for all stories. Outrigger increased the damping ratio of buildings with shear wall core considerably.

中文翻译：

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支腿对带有支撑和墙芯的高层建筑地震响应影响的比较研究。II：确定抗震设计参数

本文研究了支腿对带支撑或剪力墙高层建筑关键抗震设计参数的影响。根据对44种带支撑或壁心模型的模态响应谱（MRS）和非线性时程（NLTH）分析的结果，在随行论文和推覆分析中进行了讨论，并在本部分中介绍了支腿的影响及其放置水平上抗震设计包括响应修改因子的参数- [R ，超强因子Ω ₀，偏转放大率ç _d，和结构的阻尼比进行了研究。新的本地措施ç _d和Ω ₀根据NLTH结果提出。可以观察到，支臂导致具有墙核心的结构的强度和刚度比具有支撑核心的建筑物更大，但会降低两个系统的延展性。在大多数情况下，获得的R小于代码给出的值。对于没有支腿的主要结构，使用C _d的代码规定值会低估带墙芯结构的实际位移，而对于带支撑芯结构的结构，则会高估它的实际位移。外伸支腿导致具有支撑核心的结构的C _d增大，而具有壁核心的结构的C _d减小。两种建议的C _d度量值有很大差异显示了对所有故事都不宜使用C _d的单个值。支腿大大增加了带有剪力墙芯的建筑物的阻尼比。