弱柱強梁結構之極限層剪力計算與耐震評估方法研究

The Study of Calculations of Ultimate Story Shear and Seismic Assessment Method on Weak Column-Strong Beam Structures

陳政杰(Cheng - Chieh Chen)

指導教授 ： 林炳昌

中原大學/工學院/土木工程研究所/碩士(2001年)

https://doi.org/10.6840/cycu200100114

摘要

國內「建築物耐震設計規範」要求計算各層之極限層剪力以檢核弱層問題，但是於規範中只有簡扼的提及此項規定，並未說明如何計算。系列研究針對此點，已提出一套合理計算各層極限剪力的近似方法，但僅適用於已有韌性設計(即強柱弱梁的設計)的建築物，然而國內現存許多老舊結構而言，當初設計或施工時並沒有採用韌性設計觀念，因此實務上可能有弱柱強梁現象，無法使用前述方法檢核之；本文改進先前的極限層剪力計算方法，配合工程界常用的ETABS彈性分析軟體，使得一般結構無論有無採用韌性設計均可使用這套簡易的極限層剪力計算方法。
另外在國內在921地震後，特別注意現存建築物的耐震能力，許多建築物均被要求實施耐震能力評估，但是依現有的評估方法結果，有些老舊建築物耐震能力的結論引起許多的爭議與討論，本文乃針對內政部建築研究所所推廣之88年版「鋼筋混凝土建築物耐震能力評估法及推廣」作為研究的對象，了解其計算原理與過程，針對可能高估建築物耐震能力之處提出改進方法，使得評估結果更加客觀與安全。

關鍵字

耐震能力評估 ； 塑性鉸 ； 極限層剪力 ； 弱柱強梁 ； 韌性

並列摘要

To check the problem of weak story is required by using the calculation of the ultimate story shear of each level in our seismic design code. But, only simply mentioned demand in the new version rule, not clarify how to calculate. Some studies about this topic have provided a set of method to calculate a reasonable ultimate story shear of each level. But that method only can be used in the kind of buildings having the ductility design. However, many old buildings didn’t design by the concept of ductility or poor construction in detail. Therefore, those buildings may have weak column and strong beam, so for no estimation method can be do. This paper improve pre-studies, to develop a method of calculations for ultimate story shears by using the results of ETABS, which is a elastic analysis software, and no matter the structure with ductility design or not.
We paid much attention on the seismic capacity of buildings after the Chi-Chi earthquake happened. But according to the current assessment method, some conclusions old buildings have a lot of arguments. This paper based on the vision of“Seismic Capacity Assessment and Popularizing for RC Building”that was 88 year edition and promoted by “Architecture ＆ Building Research Institute, Minster of Interior” to find out the reasons of over-estimated rules and improved it. This study will ensure the assessment more objective and believable.

並列關鍵字

seismic capacity assessment ； ductility ； ultimate story shear ； plastic hinge ； weak column-strong beam

參考文獻

【3】中華民國建築師公會全國聯合會，「九二一集集大地震震災調查建築物耐震能力評估

【16】「鋼筋混凝土建築物耐震能力評估法及推廣」，內政部建築研究所，民國88年12月。

【21】ETABS USER’S MANUAL, Three Dimensional Analysis of Building System

Ashraf Habibullah, 1995.

【22】CONKER, Design of Concrete Frames, A Postprocessor for ETABS, Ashraf