鋼筋混凝土梁開榫端剪力強度之預測

Prediction of Shear Strength for Reinforced Concrete Dapped-end Beams

楊志雲(Jyh-Yun Yang) ； 林英俊(Ing-Jaung Lin)

《中國土木水利工程學刊》 22卷2期 (2010/06) Pp. 195-204

https://doi.org/10.6652/JoCICHE.201006_22(2).0007

摘要

本研究係採用壓拉桿觀念建立剪力強度模式以預測鋼筋混凝土梁開榫端所提供之剪力強度。模式之建立主要是考慮主拉力鋼筋與對角壓桿所形成的壓拉桿機制及橫向鋼筋機制來提供鋼筋混凝土梁開榫端之剪力強度，並進一步依據前人研究之130個試驗資料建立剪力強度預測公式以直接計算鋼筋混凝土梁開榫端之剪力強度。本研究中並將建議模式與軟化壓拉桿模式簡算法、ACI318-08附錄A壓拉桿模式及PCI設計手冊方法做比較。研究結果顯示，本研究之建議公式計算簡單，且分析結果合理及安全，故本研究所建議之設計方法，可供工程界設計鋼筋混凝土梁開榫端時參考。

關鍵字

鋼筋混凝土梁開榫端 ； 壓拉桿機制 ； 剪力強度模式

並列摘要

A model for determining the shear strength of reinforced concrete dapped-end beams is proposed in this study. In this model, it is assumed that the shear strength of dapped-end beams is provided by the strut-and-tie mechanism and the transverse reinforcement as well. In this study, test results of 130 specimens available in the literature are compared with the results predicted separately by the proposed model, the approach of PCI Designed Handbook, the simplified softened strut-and-tie model, and the strut-and-tie model of ACI 318-08. The comparisons show that the proposed model can more easily and reasonably predict the shear strength of reinforced concrete dapped-end beams, and then a design formula is proposed.

並列關鍵字

reinforced concrete dapped-end beams ； strut-and-tie mechanism ； shear strength model