鋼筋配置對垂直承重牆結構物開孔之影響; The Influence of Rebar Arrangement around opening of Vertical Bearing Wall Structure

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Title:	鋼筋配置對垂直承重牆結構物開孔之影響;The Influence of Rebar Arrangement around opening of Vertical Bearing Wall Structure
Authors:	王郁勝;Yu-sheng Wang
Contributors:	土木工程研究所
Keywords:	開孔;承重能力;承重牆;鋼筋混凝土;Bearing Capacity;Opening;Bearing Wall;Reinforced Concrete
Date:	2010-07-15
Issue Date:	2010-12-08 13:33:17 (UTC+8)
Publisher:	國立中央大學
Abstract:	承重牆結構在一般建築物或地下結構物占有很大一部分的承重能力，通常因門窗或其他設施需求，須於牆體施作開孔，而這些開孔將影響整體之承重能力甚至破壞模式，本研究即針對其開孔周圍補強鋼筋排置方式對牆體承重能力進行研究。根據現行美國混凝土學會規範(ACI318-08)，其規定於承重牆結構之開孔補強方式僅有大略之方針，並無詳細描述補強鋼筋設計及排置鋼筋的方法，也因此為本研究之主要動機。本研究製作7組承重牆縮小尺寸試體，並以單點荷重方式實驗其承重能力，其中以開孔與否及鋼筋排置方式做為主要控制變因，同時量測混凝土及鋼筋應變，並觀察試體的破壞情形。實驗結果顯示，牆體開孔處斷面積之折減率與損失之承重能力比例相當接近，可用於參考設計補強鋼筋量，其補強鋼筋依照主壓應變軌跡方向可使牆體具有最佳之承載能力。 Bearing wall structures play an important role in common buildings and underground structures, and they usually have to make some openings in the wall structure as window, door or other facilitate essential services , which influence the performance and failure mode of RC walls very much. The objective of this investigation is to compare the bearing capacity and performance of RC walls with different reinforcements arrangement around openings. According the American Concrete Institute 318 Standard, they have only a little guideline and information for reinforcement around openings of RC walls ,and they doesn’t mention how to design and arrange reinforcement around openings in detail in the content. Thus, the main motivation of this research is to investigate the influence of reinforcement arrangement around opening of bearing wall structure. There are seven small-sized bearing wall specimens, and they are tested for bearing capacity under single point loading. The main variables investigated are the opening or not and reinforcement arrangement around openings. We measured the strain of rebars and concrete and observed the failure mode at the same time. The result shows that the reduction ratio of load capacity between opening specimens and non-opening specimens almost equal to the reduction ratio of cross-section area, and we can design the reinforcing steel ratio according to the value of reduction ratio. And the reinforcing steel arranged according to the trajectory of principal strain shows the most bearing capacity in walls.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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