RC建築物之漸進式崩塌強度與動力放大因子分析

Progressive Collapse Resistance Analysis and Dynamic Amplification Factor of a RC Building Subjected to Column Failure

蔡孟豪(Meng-Hao Tsai) ； 林秉輝(Bin-Hui Lin)

《中國土木水利工程學刊》 21卷1期 (2009/03) Pp. 1-11

https://doi.org/10.6652/JoCICHE.200903_21(1).0001

摘要

本研究選用一RC建築物實例，探討移除底層柱後的漸進式崩塌強度與動力放大因子的變化。結果顯示，美國公共事務管理局建議的線性靜力分析法，並不適用於塑性範圍；該方法採用2.0為動力放大因子，會得到較為保守的漸進式崩塌強度。從不同方法的執行結果研判，非線性靜力分析為最有效率的漸進式崩塌分析法。非線性靜力分析的載重－位移關係，可用來建立容量曲線以估計近似崩塌強度與動力放大因子。由單自由度模型的解析研究得知，不同的塑性模型參數或韌性需求，會產生不同的動力放大因子；當動力放大因子小於1.0時，即代表於該載重下會產生漸進式崩塌的結果。

關鍵字

漸進式崩塌 ； 非線性靜力分析 ； 動力放大因子 ； 容量曲線

並列摘要

Linear static, nonlinear static, and nonlinear dynamic analyses are conducted to estimate the progressive collapse resistance of a RC building under four threat-independent, column-removed conditions. A step-bystep procedure recommended by the U.S. General Service Administration (GSA) is used for the linear static analysis. Load-displacement response curves obtained from the three methods are compared to investigate the force-based dynamic amplification factor (DAF). It is observed that a constant DAF of 2.0 is conservative for estimating the collapse resistance of a ductile column-removed building. However, the linear static procedure may fail to appropriately simulate the inelastic response of the building. A capacity curve, which is constructed from the nonlinear static load-displacement response, may be applied to approximate prediction of the collapse resistance and the DAF for a column-removed building. An analytical methodology is proposed and used to demonstrate the dependence of the force-based DAF on hinge model parameters. It is shown that the analytical method is capable of predicting the collapse resistance and the force-based DAF of an inelastic structure under vertical downward loadings.

並列關鍵字

progressive collapse ； load-displacement response ； dynamic amplification factor ； capacity curve