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    余瑜^1,2，  谷軍³
    （1 重慶大學(xué)土木工程學(xué)院，重慶400045；2 山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室（重慶大學(xué)），重慶400045；3 重慶市建設(shè)工程質(zhì)量監(jiān)督總站，重慶400018）

[摘要] 收集了13個(gè)梁柱節(jié)點(diǎn)在低周反復(fù)荷載作用下梁、柱、節(jié)點(diǎn)變形引起的梁外端撓度占總撓度的比例變化情況及其中4個(gè)試件的梁端荷載一節(jié)點(diǎn)剪切變形滯回曲線，從中得出影響節(jié)點(diǎn)剪切變形的幾個(gè)主要因素：軸壓比、剪壓比、節(jié)點(diǎn)配箍特征值、循環(huán)次數(shù)。在對(duì)試驗(yàn)所得的梁端荷載．剪切變形滯回曲線的特征、走向、趨勢(shì)進(jìn)行分析的基礎(chǔ)上，提出了節(jié)點(diǎn)剪切變形模型。該模型考慮了混凝土強(qiáng)度、軸壓比、剪壓比、節(jié)點(diǎn)配箍特征值、循環(huán)次數(shù)五個(gè)影響因素。經(jīng)驗(yàn)證梁端荷載．位移滯回規(guī)律模擬程序可較好地模擬節(jié)點(diǎn)的受力規(guī)律及抗震性能。
[關(guān)鍵詞] 梁柱節(jié)點(diǎn)；剪切變形；滯回曲線
中圖分類號(hào)：TU312    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2011) S2-0162-06

Shear deformation model of concrete frame joint subjected to low cyclic reversal load
Yu Yu^1,2, Gu Jun³
(1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 Key Laboratory of New Technology for Construction of Cities in Mountain Area( Chongcpng University), Ministry of Education, Chongqing 400045, China; 3 Chongqing Construction Project Quality Supervision Station, Chongqing 400018, China)

Abstract: Beam-end displacements proportion of 13 beam-column subassemblies changes that were caused by the beam deformation, column deformation, joint deformation and 4 beam-ends load shear deformation hysteresis loops were collected. According to the test results, the factors of effecting shear deformation, such as axial compression ratio, shear compression ratio, stirrup characteristic value and cycle number were proposed. Based the characters, trends, change rules of the load-shear deformation hysteresis loop in the test, the joint'8 shear deformation model under low cyclic reversal load was proposed. In the model, axial compression ratio, shear compression ratio, stirrup characteristic value and cycle number were considered. It is proved that the simulation program of hysteretic characteristics of beam-column subassemblies have the capacity of simulating successfully the joint's seismic behaviour.
Keywords: concrete frame joint; shear deformation; hysteresis loop