本研究的目的，是根據Kaisai 提出的簡化彈簧模型建立剪力樑，來分析結構物在地震動力測試下之行為，與原結構相比，其精準度如何，是本篇研究重點。
使用5 樓、10 樓及20 樓3 種代表性結構物及其剪力樑模型，來作1940NS El Centero 地震動力分析，討論結構物及其剪力樑在「絕對位移」、「層剪力」、「層位移」、及「層加速度」之誤差，針對以下3 種狀況進行動力分析，誤差為：
（Ａ）結構物含本身阻尼比5%，作0.28g EL Centro 地震動力分析：10.63%、7.55%及12.17%。
（Ｂ）結構物裝上阻尼器後，作0.28g EL Centro 地震動力分析：7.34%、8.88%及8.6%。
（Ｃ）結構物裝上阻尼器後，作0.1g EL Centro 地震動力分析：8.61%、11.86%及11.86%。
剪力樑模型模擬結構物行為可說是相當準確，總結如下：
（1）中小型地震下（case C），因為最大層位移恰巧發生在降伏點附近，相較於5 樓及20 樓結構物，10 層樓結構物誤差達2 倍。
（2）在大型地震下（case Ｂ），5 樓、10 樓及20 樓結構物之剪力樑模型誤差約在10%。
（3）在彈性狀態（case A），誤差約在10.12%。
（4）在case A & B 中，5 樓、10 樓及20 樓3 種不同高度的結構物在強烈地震下，整體誤差約在10.63%、7.55%、12.17%（case A）及7.34%、8.88%、8.6%（case B）。
（5）絕對加速度在剪力樑模型中，是誤差最大的，樓層越高，誤差越大。

A simplified nonlinear shear beam model based on Kaisai’s three springs model was adopted to investigate the dynamic seismic behavior of the structures with midspan dampers. The effectiveness of the shear beam models are then evaluated compared to the full model of the structure.
Three typical 5, 10 and 20 storey structures subjected to modified 1940NS El Centero Earthquake were thoroughly studied with full structure model and shear beam model. The nonlinear shear beam models are established by static pushover analysis. The difference of the resulted story displacement, story shear, story drift, and story acceleration of the shear beam model and full structure model were investigated. Three types analysis are conducted on 5, 10, 20 story structures and the overall average result differences are : (A) for structure with 5% damping ratio subjected 100% EL Centro are: 10.63%,7.55%,12.17%, (B) for structure with nonlinear damper subjected to 100% EL Centro are: 7.34%,8.88%,8.6%, (C) for structure with nonlinear damper subjected to 36% EL Centro are 8.61%,11.86%,11.86%.
For the cases studied, the shear beam model appear to very effective as a model for structure with braced damper. The result of the study weresummarized as following:
(1)For medium earthquake analysis as in case C, the error of the results is about twice of the other cases only for 10 story structure, this is because the maximum story drifts are happen to close to the story drift yielding points.
(2)For strong earthquake analyss as in case B, the nonlinear shear beam model results an overall 10% error in analysis result for all 5, 10,20story structures.
(3)The linear shear beam model results an overall 10.12% error as in caseA.
(4)For three different story structures under strong earthquake input as in case A & B, the shear beam model reults an overall 10.63%,7.55%,12.17%（case A）and 7.34%,8.88%,8.6%（case B）with the error for 20 story structures marginally larger.
(5)The shear beam model results significant larger difference in story acceleration than other parameters studied, especially for taller structures in all cases.

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