已非線性靜力側推分析案例探討新建建物耐震設計參數

The Study of the Seismic Assessment Parameters of a New Design Building by Nonlinear Static Pushover Analysis

周德光(Te-Kuang Chow) ； 葉勇凱(Assist Technician)

《結構工程》 30卷2期 (2015/06) Pp. 86-109

https://doi.org/10.6849/SE.201506_30(2).0005

摘要

目前新建建物的設計係基於現行耐震設計規範，依據耐震需求與設定之容許韌性容量，再與反應譜結合，提供設計者最小設計水平總橫力，在構件未達到非線性階段條件下，進行彈性設計。而現行耐震評估程序係針對既有建物採用非線性側推分析，依據性能需求（如中震不壞）設定性能目標（如層間變位大小），以評估所得之性能目標地表加速度（性能目標所對應之地表加速度）與場址475年設計地震最大地表加速度比較，作為結構耐震能力是否足夠之依據。本文探討依最新耐震設計規範進行設計之建物，使用耐震評估之側推分析，從而比對其相關參數並加以探討。以土木404－100「混凝土工程設計規範之應用」下冊提供之新建設計結構，進行非線性側推分析求取性能目標地表加速度，對於耐震設計規範中參數如降伏、極限水平總橫力及容量曲線顯示之韌性容量，皆比現行耐震設計規範法規需求值為高，顯示新建設計仍偏向保守。

並列摘要

At present, the commonly used method for new building design is based on the current seismic design specification, according to seismic requirements and the allowable toughness capacity, which provides designers with minimum total horizontal force design level, and then combined with the response spectrum to complete the elastic design, before those structure members reach the nonlinear stage. The current seismic assessment procedures using the nonlinear pushover analysisgain the result .The result of performance target ground acceleration is used to compare with the site peak ground acceleration of design earthquake with a 475-year return period to evaluate the seismic capacity is enough or not. This article explores the parameters of their differences between the latest seismic design specifications in accordance with the building design and the use of seismic evaluation of pushover analysis. Using the Civil 404-100 as the new design case, run the nonlinear pushover analysis to gain the performance target ground acceleration. Whether initial yield lateral force or capacity curve, are higher than the current seismic design specifications. It illustrates that the current seismic design specifications has the more conservative minimum design lateral force and the toughness capacity.

並列關鍵字

new design ； seismic design specification ； seismic evaluation ； nonlinear pushover analysis