強脊結構系統之耐震行為研究

Strongback systems for enhancing the seismic performance of buildings

10.6849/SE.201812_33(4).0001

郭銘桂(Meng-Kwee Kek)；林瑞良(Jui-Liang Lin)；蔡克銓(Keh-Chyuan Tsai)

層間位移角 ； 廣義建築模型 ； 強脊系統 ； 非線性反應歷時分析 ； inter-story drift ratio ； generalized building model ； strongback ； nonlinear response history analysis

結構工程

33卷4期（2018 / 12 / 01）

5 - 28

繁體中文

為解決結構受震層間位移角分佈不均之問題，本研究希望利用簡化分析模型對強脊系統（strongback system）進行大量的參數分析，提出有效的設計參數。本研究以廣義建築模型（generalized building model，GBM）及含強脊系統之廣義建築模型（generalized building model with strongback，GBMSB）作為簡化的數值模型，針對在台北二區，第二類地盤的三、六、九和二十層建築進行參數分析。採用SRSS振態疊加法估算最大彈性層間位移角，並利用層間位移角的標準偏差作為均勻度指標，評估層間位移角分佈之均勻性，使層間位移角的標準偏差為最小之設計為最佳設計。分析結果顯示強脊系統為純剪力型式，且其層勁度呈線性遞減，並且於一樓加勁的勁度分配法效果最佳。為了驗證參數分析之有效性，採用SAC研究計畫中的九層鋼構造抗彎矩構架，和國家地震工程研究中心台南實驗室的三層鋼筋混凝土構架試體作為驗證例。將原始結構模型（分別稱為SAC9和T3）、含最佳強脊系統之結構模型（分別稱為SAC9-SB和T3-SB）、及含非最佳強脊系統之結構模型，分別利用PISA3D結構分析程式進行非線性反應歷時分析。結果顯示配置最佳強脊系統之SAC9-SB和T3-SB層間位移角之標準偏差平均值最小，能使層間位移角分佈最為均勻。

In order to reduce the variations of peak inter-story drifts occurred in earthquakes along the building height, this research conducts the parametric study of the buildings with strongback systems through simplified numerical models. The generalized building model (GBM) and generalized building model with strongback (GBMSB) are employed as the simplified numerical models in the parametric study. This study investigated 3, 6, 9 and 20-story buildings. The peak inter-story drift ratios along the building height are computed 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. 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 height, the standard deviation of inter-story drifts is minimized. The effectiveness of the proposed method is verified by investigating one 9-story steel building and one 3-story reinforced concrete (RC) building. The 9-story steel moment resisting frame, designated as SAC9, was a prototype building located in Los Angeles adopted in SAC steel research project. In addition, the 3-story RC building, designated as T3, was tested using shaking table at Tainan Laboratory of National Center for Research on Earthquake Engineering. The optimal designs of SAC9 and T3 with the strongbacks are designated as SAC9-SB and T3-SB, respectively. 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. 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.

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