新矩形混凝土柱圍束型式之研究

Research of New Hoops for Rectangular Concrete Columns

王柄雄(Ping-Hsiung Wang)

指導教授 ： 張國鎮

國立臺灣大學/工學院/土木工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00354

摘要

國內傳統矩形橫箍柱的圍束方式，不但在鋼筋籠的組立作業上需耗費釵h的人力，且箍、繫筋綁紮常會因綁紮不確實而使得整體構件品質不易控制。此外，為了增加施作效率，繫筋常採90度及135度彎鈎沿斷面及高程方向交錯配置的方式，但在強震下常會因90度彎鈎撐開而導致提早破壞的情況。為改善上述諸多傳統矩形橫箍柱的缺點，本研究進行一系列圍束型式的試驗研究，包括實尺寸圍束混凝土矩柱之軸壓試驗及側向反覆載重試驗，軸壓試驗進行28組圍束型式的探討，包括2組傳統型式及26組新圍束型式，由這些新圍束型式中選出兩組圍束行為較好的型式進行側向反覆載重試驗以了解其側向強度及消能能力。試驗結果顯示，在適當的組合之下，螺箍可成左犒B用在矩形柱中，且其圍束行為甚至優於傳統圍束型式，其中又以四個螺箍及五個螺箍的組合型式最為有效。另外在不同圍束型式軸壓行為的分析上，本研究之圍束混凝土非線性有限單元模式均可得到良好的模擬及預測結果。

關鍵字

矩形混凝土柱 ； 有限元素 ； 圍束

並列摘要

Conventionally, the confinements in rectangular concrete columns are composed of rectangular hoops and cross ties. It takes not only time to form the cages but also is hard in quality control. Besides, cross ties with 90-degree and 135-degree bend which are to be alternated along the height and around the perimeter of the section are permitted to ease construction, but the 90-degree end can possibly leading to premature failure under severe earthquake. In order to improve those weaknesses in traditional confinements for rectangular concrete columns, series tests with alternate confinements for rectangular concrete columns are conducted in this research, including axial compressive tests of full-scale rectangular specimens and lateral cyclic loading test of full scaled columns. There are total 28 alternate confinements been evaluated in the axial compressive tests, including 2 traditional patterns and 26 new patterns. Among the 26 new patterns, two promising details were selected for further lateral cyclic loading test to find out their strength and abilities of energy dissipation. Test results showed that spiral hoops can be successfully used in rectangular concrete columns by suitable combinations, and the behaviors are even better than traditional rectangular specimens. Confinements with four spirals and five spirals are proven to be much more excellent and effective then the others. Non-linear finite element analytic models with detail confinements were built to predict the results of compressive tests. Behavior of confined concrete with the new proposed details can all be well caught by these analytic models.

並列關鍵字

Rectangular concrete columns ； Confinements ； Finite element

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