混凝土框架內(nèi)節(jié)點(diǎn)受剪承載力計(jì)算模型和方法研究*
秦全，王立成，宋玉普
- 摘 要
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秦全，王立成，宋玉普（大連理工大學(xué)海岸和近海工程國(guó)家重點(diǎn)實(shí)驗(yàn)室， 大連 116024）［摘要］對(duì)鋼筋混凝土框架內(nèi)節(jié)點(diǎn)受剪承載力計(jì)算模型，即受剪通用分析模型和簡(jiǎn)化拉-壓桿模型進(jìn)行了系統(tǒng)的總結(jié)和分析，并利用國(guó)內(nèi)已有的試驗(yàn)結(jié)果分析對(duì)比了兩種模型預(yù)測(cè)結(jié)果的準(zhǔn)確性。在框架內(nèi)節(jié)點(diǎn)試驗(yàn)結(jié)果的基礎(chǔ)上提出了節(jié)點(diǎn)核心區(qū)名義剪力的改進(jìn)計(jì)算方法。改進(jìn)的節(jié)點(diǎn)名義剪力計(jì)算方法能夠考慮梁端剪力的往復(fù)作用，提高了試驗(yàn)中內(nèi)節(jié)點(diǎn)水平剪力實(shí)際值的精確性。對(duì)受剪通用分析模型從原理上進(jìn)行了分析，指出節(jié)點(diǎn)受剪通用分析模型的改進(jìn)需要考慮柱軸壓力對(duì)核心區(qū)混凝土裂縫的約束作用。通過考慮梁端往復(fù)荷載作用下梁受壓區(qū)混凝土高度，改進(jìn)了簡(jiǎn)化拉-壓桿模型設(shè)計(jì)方法；與實(shí)際值的對(duì)比分析表明，改進(jìn)簡(jiǎn)化拉-壓桿模型計(jì)算結(jié)果與實(shí)際值更為接近且較為保守，改進(jìn)模型計(jì)算結(jié)果與試驗(yàn)結(jié)果的平均比值為0.85。［關(guān)鍵詞］鋼筋混凝土梁柱內(nèi)節(jié)點(diǎn)；節(jié)點(diǎn)名義剪力；受剪通用分析模型；簡(jiǎn)化拉-壓桿模型中圖分類號(hào)：TU398+.7 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)08-0063-06Study on analytical models and improvement for the shear loading capacity of reinforced concrete beam-column interior jointsQin Quan, Wang Licheng, Song Yupu(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)Abstract: The shear capacity models, i.e., the general analytical model and the simplified softened strut-and-tie model, for reinforced concrete beam-column interior joints were systematically summarized. The precision of predicted results by two models was compared with the available test data. A improved calculation method for the pseudo shear of the beam-column interior joints under cyclic loading was proposed to increase the accuracy of real horizontal shear force of the joints, which can take into account the cyclic effect of shears on the beam ends. Through the principle analysis of the general analytical model, it is suggested that the confining effect of the axial compressive force of the column on cracks of the core concrete should be considered to improve the general analytical model. The simplified softened strut-and-tie model was improved by considering the height of compression zone of beams subjected to cyclic loading. It has been proved by test data that predicted results with the improved simplified softened strut-and-tie model is consistent with the test data and conservative.The average ratio of predicted results by the improved model and test results is 0.85.Keywords: reinforced concrete beam-column interior joint; joint pseudo shear; general analytical model for nominal shear stress; simplified softened strut-and-tie model*國(guó)家自然科學(xué)基金重大研究計(jì)劃（90815026）。作者簡(jiǎn)介：秦全，碩士研究生，Email:qinquan0622@163.com。參考文獻(xiàn)［1］ATTAALLA SAYED. General analytical model for nominal shear stress of type 2 normal-and high-strength concrete beam-column joints［J］. ACI Structural Journal, 2004, 101(1): 65-75.［2］HWANG SHYH JIANN, LEE HUNG JEN. Analytical model for predicting shear strengths of exterior reinforced concrete beam-column joints for seismic resistance［J］. ACI Structural Journal, 1999, 96(5): 846-857.［3］HWANG SHYH JIANN, LEE HUNG JEN. Analytical model for predicting shear strengths of interior reinforced concrete beam-column joints for seismic resistance［J］. ACI Structural Journal, 2000, 97(1): 35-44.［4］季濤，錢在茲，莊一舟. 鋼纖維鋼筋混凝土扁梁柱節(jié)點(diǎn)極限抗剪承載力的計(jì)算方法［J］. 建筑結(jié)構(gòu),2000,30(9):49-52.［5］HWANG SHYH JIANN, LEE HUNG JEN. Strength prediction for discontinuity regions by softened strut-and-tie model［J］. ASCE Journal of Structural Engineering, 2002, 128(12): 1519-1526.［6］SHIOHARA HITOSHI.New model for shear failure of RC interior beam-column connections［J］.ASCE Journal of Structural Engineering,2001,127(2):152-160.［7］趙國(guó)藩. 高等鋼筋混凝土結(jié)構(gòu)學(xué)［M］.北京: 機(jī)械工業(yè)出版社, 2008.［8］傅劍平. 鋼筋混凝土框架節(jié)點(diǎn)抗震性能與設(shè)計(jì)方法研究［D］. 重慶: 重慶大學(xué), 2002.［9］傅劍平, 陳小英, 陳濤, 等. 中低剪壓比框架節(jié)點(diǎn)抗震機(jī)理的試驗(yàn)研究［J］. 重慶建筑大學(xué)學(xué)報(bào), 2005，27(1): 41-47.［10］傅劍平, 張川, 陳濤, 等. 鋼筋混凝土抗震框架節(jié)點(diǎn)受力機(jī)理及軸壓比影響的試驗(yàn)研究［J］. 建筑結(jié)構(gòu)學(xué)報(bào), 2006, 27(3): 67-77.［11］傅劍平, 朱愛萍, 陳小英, 等. 框架高剪壓比中間層中節(jié)點(diǎn)抗震性能試驗(yàn)研究［J］. 重慶建筑大學(xué)學(xué)報(bào), 2006, 28(1): 40-46.［12］傅劍平, 張笛川, 陳濤, 等. 中等偏高剪壓比抗震節(jié)點(diǎn)傳力機(jī)理及性能試驗(yàn)［J］. 重慶建筑大學(xué)學(xué)報(bào):自然科學(xué)版, 2005, 28(6): 84-90.［13］框架節(jié)點(diǎn)專題研究組. 低周反復(fù)荷載作用下鋼筋混凝土框架梁柱節(jié)點(diǎn)核心區(qū)抗剪強(qiáng)度的試驗(yàn)研究［J］. 建筑結(jié)構(gòu)學(xué)報(bào), 1983, 4(6): 61-75.［14］呂西林, 郭子雄, 王亞勇. RC框架梁柱組合件抗震性能試驗(yàn)研究［J］.建筑結(jié)構(gòu)學(xué)報(bào),2001,22(1):2-7.［15］曹忠民，李愛群. 鋼筋混凝土梁柱節(jié)點(diǎn)最新抗剪通用分析模型的修正［J］.鐵道工程學(xué)報(bào),2005(6):28-31.
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