有瑕疵構件的構架彈塑性分析

Elastic Plastic Analysis for Steel Frames with Defect Members

張雅芳(Ya-Fang Chang)

指導教授 ： 金文森

朝陽科技大學/理工學院/營建工程系/碩士(2009年)

摘要

地震過後或建造疏忽，使建築物出現一些破壞與瑕疵，例如構架側傾，部份樑或柱斷面尺寸縮小，一根或多根柱子建造時因疏忽或為了建築設計而旋轉，建築物的樑上凸或下凹及柱內凹或外凸等現象，對構架的承載力可能會降低或增加。本文即針對有瑕疵或特殊構件的構架利用SAP2000第七版程式進行非線性彈塑性靜力側推分析，並研究構架的極限承載力，載重-位移曲線，塑性鉸產生的位置，分析構件軸力、剪力、彎矩的分佈，比較正常構架與有瑕疵構架的行為差異。在研究中發現樑有瑕疵的構架，不管是將樑部份斷面尺寸放大或縮小極限載重都很相似。做典型案例分析，發現SAP 2000第7.10版尚稱準確，而第12版都高估了極限承載能力，原因可能是因為塑性鉸的準則。

關鍵字

非彈性 ； 非線性 ； 瑕疵 ； 側推分析 ； 極限載重

並列摘要

Some damages and defects such as inclined frames, reduced cross-sections in beams or columns, a column or many columns axially rotated during erection by negligence or the building design, convex or concave beams or columns in buildings occurred due to earthquakes or carelessness during construction. These effects maybe reduce or increase the loading capacities of frames. The nonlinear elastic-plastic pushover analysis of SAP 2000 version 7 is used to analyze those frames with imperfect or special members. The limit loads of frames, load-deflection curves, locations of plastic hinges, axial load, shear force and bending moment in members are studied. The differences of behavior between normal frames and flawed frames are compared. It is found that limit loads of frames with beams having a part of reduced or increased cross-section are similar. During analyses of typical cases, it was found that SAP 2000 V7.10 was still accurate, but V12 overestimated the ultimate carrying capacity. The reason maybe is due to criterion of plastic hinge.

並列關鍵字

nonlinear ； inelastic ； imperfection ； pushover analysis ； ultimate load

參考文獻

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[8] Applied Technology Council（ATC）, (1996), “Seismic Evaluation and Retrofit of Concrete Buildings”, Report No. ATC-40, Redwood City, California.