本研究主要係探討鋼筋混凝土深梁在垂直載重作用下之行為。在本研究中共製作23個試體以探討混凝土強度（ ）、深梁淨跨度與全深比（ ）、水平剪力筋量及垂直剪力筋量等參數對深梁極限剪力強度之影響。根據試驗結果，本研究分別檢核李宏仁及黃世建【1】所建議之軟化壓拉桿模型簡算法(Softened Strut-and-Tie Model)、ACI 318-05規範【2】附錄A之壓拉桿模型 (Strut-and-Tie Model)以及Russo【29】之建議公式，對深梁剪力強度預測之適用性，並探討水平及垂直剪力鋼筋應如何配置，此三種方法所得到的計算值方趨於合理且安全。整體而言，李宏仁及黃世建【1】所建議之軟化壓拉桿模型簡算法， 較大而垂直剪力鋼筋不足時，會發生早期的斜張開裂破壞，造成壓桿強度無法發揮，進而使得計算值趨於不保守。ACI 318-05規範【2】附錄A之壓拉桿模型對於深梁剪力強度之預測基本上相當保守，對 較大且垂直剪力筋量愈多之深梁，所預測的剪力強度愈趨於保守。Russo【29】建議公式之預測值，在 較大且剪力鋼筋量較低之試體，其計算值有明顯偏高之現象。

This study presents an experimental investigation of reinforced concrete deep beams subjected to vertical loads. Thenty-three specimens were tested to study the effects on ultimate shear strengths of deep beams of concrete strength, span-to-depth ratio (ln/h), horizontal shear reinforcement (Ah) and vertical shear reinforcement ( ).Test results indicate that the recommendations proposed by Hwang and Lee 【1】and Russo et al.【29】are not conservative for predicting the shear strengths of deep beams with larger span-to-depth ratio (ln/h) and lower shear reinforcement ratio.However,the shear strengths of deep beams calculated using the provisions contained in Appendix A of ACI 318-05 【2】are still quite conservative.

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