直接強度疊加法在鋼骨鋼筋混凝土(SRC)構材設計之研究

Abstract

摘 要 本研究旨在探 討鋼骨鋼筋混凝土(SRC)構材極限強度設計上之相關問題。研究中首先 以 「直接強度疊加」之概念探討SRC構材之彎矩強度、剪力強度與軸力強度 ，並分別提出 新的設計方法，然後再與AIJ-SRC 規範(1987)、AISC- LRFD(1993)規範相互比較，研究結 果顯示本建議法可以得到合理之結果 。此外，本研究對SRC梁柱構材設計方法提出三組建 議設計方法，其中兩 組建議法係結合「剛度分配」之理念， 並對混凝土之非線性行為加 以考 量，以期得到合理之設計結果；第三組建議法則以「直接強度疊加」之概 念進行SRC 梁柱之設計， 研究中將以三組建議法所得之結果與國外主要 的規範作比較，以驗證本建 議法之適用性。 最後，本研究並發展一套結 合ETABS程式之SRC構造設計檢核程式，針對一棟十層樓之SRC 構架進行結 構分析與強度檢核，以驗證本研究建議方法之可行性。 關鍵詞﹕鋼骨鋼 筋混凝土，直接強度疊加法，彎矩強度，剪力強度，軸向抗壓強度， 剛度分配法，梁柱設計。 Abstract The object of this research is to investigate the related requirements of ultimate strength design (USD) of steel reinforced concrete(SRC) members.This study is firstly based on the "Direct Strength Superposition" concept todetermine the flexural strength、shear strength and axial strength of the SRCmembers with proposed design methods. Then the nominal and design strength ofthe SRC member obtained by the proposed methods are compared with the resultscalculated by those formulae suggested by AISC-LRFD specification (1993) andAIJ- SRC code (1987). It has been shown that the results of the proposedmethods are reasonable. Besides, the new design approaches are suggested forSRC beam-column design. Tow of the approaches are based on the "RelativeRigidity Distribution" concept. To obtain satisfactory results of the SRCbeam-columns design, inelastic behavior of concrete portion is considered inthis study. And the third proposed method is based on the "Direct StrengthSuperposition" concept to design SRC beam-columns. Then a comparison amongthe SRC beam-column strength predicted by the AISC-LRFD specification, theAIJ-SRC code and the proposed method to prove the practicability of theproposed approach. Finally, a computer program based on the proposed methods is developedfor SRC structural design. It is found that the results obtained form the proposed method are satisfactory. Key words : Steel Reinforced Concrete (SRC), Dire ct Strength Superposition Method, Flexural Strength, Shear Strength, Axial Compression Strength, Rigidity Distribution Method, Beam-Column Design.