دانلود رایگان مقاله انگلیسی پیش بینی ظرفیت فروپاشی قاب های مقاوم خمشی با میراگرهای ویسکوز مایع - الزویر 2018

ABSTRACT

Nowadays, passive energy dissipation systems are used in the seismic design of new structures and the retrofit of existing structures. Fluid Viscous Dampers (FVDs) are one of the important types of passive energy dissipation systems. Using FVDs can considerably decrease the seismic demands on structures. In this study, seismic collapse behavior of steel Special Moment Resisting Frames (SMRFs) equipped with FVDs is investigated using different scalar Intensity Measures (IMs). Incremental Dynamic Analysis (IDA) method is applied to determine the collapse capacity, IMcol, values for low- to mid-rise steel SMRFs equipped with FVDs. After determining the collapse capacity, IMcol, values by using each of the IMs, the efficiency and sufficiency of the IMs for predicting the seismic collapse capacity of the structures are investigated. Then, advanced scalar IMs, including the effects of spectral shape and ground motion duration, are proposed to reliably predict the collapse capacity of steel SMRFs equipped with FVDs. The results indicate that the proposed IMs possess high efficiency and sufficiency for collapse capacity prediction of steel SMRFs equipped with FVDs.

Conclusions

In this study, the efficiency and sufficiency of 27 scalar IMs, including 13 non-structure-specific and 14 structure-specific IMs, to predict the collapse capacity of steel SMRFs with and without FVDs were investigated. For this purpose, 12 SMRF structures including three code-designed benchmark structures and nine structures derived from the benchmark structures, by changing their height or seismic mass, were considered. In addition to the 12 SMRF structures, assuming three levels of supplemental viscous damping ratio, linear and nonlinear FVDs were added to the SMRFs and 144 SMRFs with FVDs were considered. The obtained results indicated that none of the non-structurespecific IMs could satisfy both the efficiency and sufficiency criteria. The structure-specific IMs consist of Sa(T1), the spectral shape based IMs and the combined spectral shape and duration based IMs. It was indicated that among the spectral shape based IMs, IMC, INp, IMM and Saavg are more efficient than the others, but they are facing the sufficiency problems with respect to either M or SF (or both). The combined spectral shape and duration based IMs are IMC–D, IMM–D, INp–D, INp M–D, Saavg–D and Saavg M–D. Sensitivity analyses were performed to select the optimal values of the parameters for these IMs by considering the efficiency and sufficiency criteria simultaneously. After selecting the optimal values of the parameters for use in the combined spectral shape and duration based IMs, the results obtained by using these IMs were compared, and the IMs IMM–D, INp M–D and Saavg M–D were proposed as advanced scalar IMs to reliably predict the collapse capacity of steel SMRFs with FVDs.