壓拉桿模式應用於評估SRC深梁抗剪強度之研究

Abstract

由於目前國內外的建築構造設計規範尚無有關鋼骨鋼筋混凝土 (SRC) 深梁之明確 設計規定，因此本研究擬針對包覆型SRC 深梁之抗剪強度進行分析研究。基本上，由 於SRC 構材為鋼骨與鋼筋混凝土兩種構材之結合，因此本研究將探討最新版的ACI-318 結構混凝土設計規範 (2002)中有關RC 深梁之壓拉桿模式 (Strut-and-Tie Model) 是否可 以適用於SRC 深梁之設計。另一方面，AISC-LRFD 鋼結構設計規範 (1999) 中所採用 的鈑梁 (Plate Girder) 設計方法是否亦可應用於SRC 深梁或是否應予以適度之修正。 本研究擬廣泛收集國內外有關SRC 深梁之實驗資料，根據前人之實驗結果，深入 分析SRC 深梁之力學行為與破壞模式，以作為評估SRC 深梁抗剪強度之依據。本研究 期望能夠從理論分析的角度提供學術界對SRC 深梁力學行為之進一步瞭解，並發展出 一套合理的SRC 深梁抗剪強度評估方法以供工程界參考。

The objective of this research is to investigate the shear strength of steel reinforced concrete (SRC) deep beams. Among the major building codes around the world, it is noted that there is no specific design provisions outlined for the design of SRC deep beams today. Since an SRC deep beam is basically a combination of a steel shape and a reinforced concrete deep beam, it maybe reasonable to calculate its shear strength using the concept of strength superposition. In this study, the strut-and tie model used in the ACI 318 code (2002) and the plate girder design provisions of the AISC-LRFD specification (1999) will be used to determine the shear strength of the SRC deep beams, with some necessary modifications to account for the composite nature of the two major components. In order to evaluate the accuracy of the proposed method for calculating the shear strength of SRC deep beams, it is necessary for this study to collect as many as possible the related SRC deep beam test data to serve as the foundation of comparison. It is hoped that the results of this investigation will provide further understanding on the true mechanical behavior of SRC deep beam, and that the proposed method will be proven satisfactory in predicting the shear strength of the SRC deep beams.