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     余志武1   聶建國(guó)2   周凌宇1   劉小潔1

    （1 長(zhǎng)沙鐵道學(xué)院建工系 長(zhǎng)沙 410075； 2 清華大學(xué)土木系 北京 100084）

[提要]  通過(guò)對(duì)國(guó)內(nèi)69個(gè)構(gòu)件和結(jié)構(gòu)的試驗(yàn)資料的重新分析，提出了影響結(jié)構(gòu)位移延性系數(shù)的主要因素：配箍特征值 β_v、名義剪跨比 λ、軸壓比n和結(jié)構(gòu)類型。通過(guò)回歸分析，建議了適用于構(gòu)件與結(jié)構(gòu)的位移延性系數(shù)的通用經(jīng)驗(yàn)公式，其計(jì)算結(jié)果與實(shí)測(cè)結(jié)果符合較好。
[關(guān)鍵詞]  砼和預(yù)應(yīng)力砼 框架 延性  回歸分析

Through the reanalysis of the test data of sixty - nine members and structures at home, the principal factors affecting the displacement ductility factor of stucture such as stirrup reinforcement characteristic value β, nominal shear span ratio λ, axial compression ratio n and structural type are put forward.  Based on regression analysis, a general empirical formula suitable for displacement ductility factor of members and structure is also suggested. There is a good agreement between the calculated and test results.
Keywords: concrete;prestressed concrete; frame; ductility