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房貞政  陳  勇  鄭則群
（福州大學(xué)結(jié)構(gòu)工程研究所 350002）

[提要]  進(jìn)行了兩個(gè)無粘結(jié)預(yù)應(yīng)力混凝土梁柱節(jié)點(diǎn)試件（一個(gè)中節(jié)點(diǎn)、一個(gè)邊節(jié)點(diǎn)）低周反復(fù)水平荷載試驗(yàn)研究。通過對(duì)兩個(gè)試件的荷載-位移滯回曲線的分析，研究了節(jié)點(diǎn)的變形能力、耗能能力、延性和剛度退化等抗震性能?；趦晒?jié)點(diǎn)試件試驗(yàn)的結(jié)果，分析了低周反復(fù)荷載作用下框架節(jié)點(diǎn)的破壞機(jī)理。
[關(guān)鍵詞]  無粘結(jié)預(yù)應(yīng)力混凝土  梁柱節(jié)點(diǎn)  低周反復(fù)荷載試驗(yàn)  抗震性能  破壞機(jī)理  核心剪切變形

Two unbonded prestressed concrete beam-column joint assemblies( one for interior joint and one for exterior joint) are tested under reversed cyclic lateral load. Based on the analysis of the hysteretic force-displacement characteristics of these two assemblies, the seismic behavior of beam-column joint is explored in following aspects:  transform capacity, energy dissipating capacity, ductility and stiffness deterioration etc. Based on the development of cracks and strains of the reinforcement etc., the failure mechanism of the two joints under reversed cyclic load is analyzed.
Keywords: unbonded prestressed concrete; beam-column joint; reversed cyclic load; quasi-static test; seismic behavior; failure mechanism; shear deformation; core area