鋼筋混凝土極短柱受剪破壞之耐震行為曲線研究

Study on the Seismic Performance Curves of Reinforced Concrete Short Columns Failed in Shear

黃益堂(Yi-Tang Huang)

指導教授 ： 黃世建

國立臺灣大學/工學院/土木工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.02886

摘要

鋼筋混凝土建築物受剪破壞而倒塌，在九二一地震勘災中屢屢可見。剪力破壞屬於脆性破壞，對建築物而言必須盡量避免之。但建築物常常為了通風、冷氣裝設、門窗等等，易使柱桿件形成極短柱，極短柱破壞主要以剪力破壞為主，側位移能力極小，所以常常是建築物第一個破壞的地方。因此本研究以實驗及分析方法，來探討鋼筋混凝土極短柱在固定軸力載重下受剪破壞之耐震行為曲線。
本研究中依實際比例共製作8座鋼筋混凝土柱試體，分別變化其高寬比、軸壓比與不同的配筋形式，採取雙曲率變形與固定軸力的型式，進行擬靜態反覆載重試驗，以了解鋼筋混凝土極短柱受剪破壞之行為，以及剪力破壞後之崩塌行為。
實驗結果顯示不同的軸壓比造成試體有不同的崩塌行為，高軸力會加速試體的崩塌。不同的配筋造成破壞模式的差異，韌性配筋會提供較大的側力與側位移能力。

關鍵字

極短柱 ； 脆性破壞 ； 雙曲率變形

並列摘要

During the 921 Chi-Chi Earthquake, a lot of reinforced concrete buildings failed in shear. Shear failure is brittle and therefore should be avoided. In order to provide ventilation, mounting of air conditioner, door frame, etc., most often extreme-short columns are encountered. These columns will be the weakest elements due to its small lateral displacement. Thus, this research is aimed to study the seismic resistant behavior of extreme-short column under constant axial force through observation in laboratory experiments and analysis.
There are several important variables which can affect the strength and behaviour of extreme-short columns, such as aspect ratio, axial load, and hoop detailing. Totally, eight specimens were tested under double curvature and constant axial load by reverse loading test to observe the behaviour of the shear and axial failures.
Test results show that under different magnitude of axial load, the collapse behaviour is different in sense that higher axial load can accelerate the failure process. Columns with transverse reinforcement using ductile detailing can resist higher lateral force and lateral displacement capability.

並列關鍵字

short column ； brittle failure ； double curvature

參考文獻

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