強脊結構系統之耐震行為研究

郭銘桂

doi:10.6342/NTU201801842

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強脊結構系統之耐震行為研究

Strong-back systems for enhancing the seismic performance of buildings

郭銘桂 , Masters　　Advisor：蔡克銓　　Co-advisor ：林瑞良

繁體中文 DOI： 10.6342/NTU201801842

層間位移角分佈；廣義建築模型；含強脊系統之廣義建築模型；振態疊加法；標準偏差；非線性反應歷時分析； PISA3D ； MATLAB ； inter-story drift ratio ； generalized building model ； strongback ； nonlinear response history analysis.

Abstract │ Reference (18) │ Altmetrics

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Many researches have attempted to reduce the variations of peak inter-story drifts occurred in earthquakes along the building height. Among various approaches, adding a strongback system into the existing building appears a very effective approach. Nevertheless, these researches show that there seems no clear recommendation on the appropriate stiffness ratio between the strongback system and the target building. Therefore, the key objective of this research is to develop a method of computing the optimal stiffness of the strongback system. The associated parametric study is performed through simplified numerical models. In addition, the effectiveness of the proposed method is verified by investigating one 9-story steel building and one 3-story reinforced concrete (RC) building.
The generalized building model (GBM) and generalized building model with strongback (GBMSB) are employed as the simplified numerical models in the parametric study. The peak inter-story drift ratios along the building height are compute by using the response spectrum analysis method, in which the peak modal responses are combined according to the SRSS method. The optimization objective is to minimize the standard deviation of the peak inter-story drift ratios. The optimal stiffness distribution of a strongback is thus obtained. This study investigated 3, 6, 9 and 20-story buildings. The results of parametric study show that when a pure shear-type strongback, whose first story is stiffened and its story stiffness decreases linearly along the hight, the standard deviation of inter-story drifts is minimized.
The 9-story steel moment resisting frame, designated as SAC9, a prototype building located in Los Angeles adopted in SAC steel research project, was used as an example buildings in this study. In addition, at 3-story RC building, , designated as T3 and tested using shaking table at Tainan Laboratory of National Center for Research on Earthquake Engineering, was also used. Then optimal designs of SAC9 and T3 with the strongbacks are designated as SAC9-SB and T3-SB, respectively.
In order to verify the effectiveness of the proposed method, nonlinear response history analyses (NRHA) of SAC9, T3, SAC9-SB, T3-SB models and the others with different properties of strongback systems were conducted using PISD3D program. Two ensembles each of 20 ground motion records of the 475-year (DBE) return periods were used in the NRHA.
The NRHA result shows that SAC9-SB and T3-SB have smaller standard deviations than those using other strongback properties. The analysis results confirm the effectiveness of the proposed method in proportioning the strongback for buildings.

Reference ( 18 ) 〈TOP〉

 Barbara G. Simpson and Stephen A. Mahin (2017) “Reducing Concentrations of Inelastic Demand with A Strongback.”
 Chen, C.H., Tsai, I.J. and Tang Y. (2017) “Drift Concentration of a Three-Story Special Concentrically Braced Frame with Strongback under Earthquake Loading.” Applied Mechanics and Materials, Vol. 863, pp. 287-292.
 Chopra, A. K.and Cruz, E. F. (1986) ‘‘Evaluation of building code formulas for earthquake forces.’’ J. Struct. Engrg., ASCE, 112, 1881–1899.
 FEMA-355C (2000) State of the art report on systems performance of steel moment frames subject to earthquake ground shaking, prepared by the SAC Joint Venture for the Federal Emergency Management Agency.
 George W. Housner (1963); The behavior of inverted pendulum structures during earthquakes. Bulletin of the Seismological Society of America ; 53 (2): 403–417. doi:

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