有鑑於台灣RC建築結構均為現場澆鑄式，樓版與梁均為一體成形，結構工程師在分析構件行為與設計鋼筋量時，將版梁分開考量似乎切實際，故促成本研究形成。對於現今RC設計規範ACI 318-05，有關於梁剪力設計，不論一般梁或深梁，均以矩形斷面來考慮，對於實際作用為T形斷面而言是否適用，是值得探討。計畫主要內容，利用實驗方式來探討T形斷面深梁與矩形斷面深梁在抗剪强度差異，作為樓版對於鋼筋混凝土梁剪力强度影響之研究。其中亦有分析模式建立，乃利用現今廣為使用之壓拉桿模式(stut-and-tie model)，以及申請者先前研究所建立之桿件桁架模式(truss or lattice model)，作為T形深梁剪力强度之預測，並研究樓版在梁剪力強度的貢獻。本計畫先行執行一年，執行工作有分析模式建立、矩形與T形深梁測試、以及T形梁剪力設計之建議等。本研究完成後，成果即可發表國際期刋，並很快提供該方面資訊以供設計者参考。In Taiwan, all the RC building structures are fabricated in site. Unlike pre-cast concrete, in-situ cast concrete slabs and beams are made in a monolithic way. An incorrect design concept is normally adopted by structural engineers that RC beams and slabs in a monolithic structural system are designed independently for a safer side. Thus based on this finding, the project is focused that the deep beam shear specified in ACI 318 should be examined if the T-shaped beams different from the original code-specified rectangular beams are to be designed. The project contains two parts for discussing the effect of existing slabs on the design shear strength of RC rectangular deep beams. The first part is to investigate the difference in shear strengths between the rectangular and T-shaped deep beams by means of an experimental program. The second part is to predict the shear strengths of both sectional beams using analytical methods, in which strut-and-tie model and truss or so called lattice model were adopted. The project is carried out for a year. The results include the testing program, parametric studies using two analytical models, and a design recommendation for the shear strength of such T-sectional beams. Meanwhile, the results will be published to SCI journals and soon be used by engineers for designing the T-beams. 研究期間 : 9808 ~ 9907
