混凝土框架内节点受剪承载力计算模型和方法研究*
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秦全，王立成，宋玉普（大连理工大学海岸和近海工程国家重点实验室， 大连 116024）［摘要］对钢筋混凝土框架内节点受剪承载力计算模型，即受剪通用分析模型和简化拉-压杆模型进行了系统的总结和分析，并利用国内已有的试验结果分析对比了两种模型预测结果的准确性。在框架内节点试验结果的基础上提出了节点核心区名义剪力的改进计算方法。改进的节点名义剪力计算方法能够考虑梁端剪力的往复作用，提高了试验中内节点水平剪力实际值的精确性。对受剪通用分析模型从原理上进行了分析，指出节点受剪通用分析模型的改进需要考虑柱轴压力对核心区混凝土裂缝的约束作用。通过考虑梁端往复荷载作用下梁受压区混凝土高度，改进了简化拉-压杆模型设计方法；与实际值的对比分析表明，改进简化拉-压杆模型计算结果与实际值更为接近且较为保守，改进模型计算结果与试验结果的平均比值为0.85。［关键词］钢筋混凝土梁柱内节点；节点名义剪力；受剪通用分析模型；简化拉-压杆模型中图分类号：TU398+.7 文献标识码：A 文章编号：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*国家自然科学基金重大研究计划（90815026）。作者简介：秦全，硕士研究生，Email:qinquan0622@163.com。参考文献［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］季涛，钱在兹，庄一舟. 钢纤维钢筋混凝土扁梁柱节点极限抗剪承载力的计算方法［J］. 建筑结构,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］赵国藩. 高等钢筋混凝土结构学［M］.北京: 机械工业出版社, 2008.［8］傅剑平. 钢筋混凝土框架节点抗震性能与设计方法研究［D］. 重庆: 重庆大学, 2002.［9］傅剑平, 陈小英, 陈涛, 等. 中低剪压比框架节点抗震机理的试验研究［J］. 重庆建筑大学学报, 2005，27(1): 41-47.［10］傅剑平, 张川, 陈涛, 等. 钢筋混凝土抗震框架节点受力机理及轴压比影响的试验研究［J］. 建筑结构学报, 2006, 27(3): 67-77.［11］傅剑平, 朱爱萍, 陈小英, 等. 框架高剪压比中间层中节点抗震性能试验研究［J］. 重庆建筑大学学报, 2006, 28(1): 40-46.［12］傅剑平, 张笛川, 陈涛, 等. 中等偏高剪压比抗震节点传力机理及性能试验［J］. 重庆建筑大学学报:自然科学版, 2005, 28(6): 84-90.［13］框架节点专题研究组. 低周反复荷载作用下钢筋混凝土框架梁柱节点核心区抗剪强度的试验研究［J］. 建筑结构学报, 1983, 4(6): 61-75.［14］吕西林, 郭子雄, 王亚勇. RC框架梁柱组合件抗震性能试验研究［J］.建筑结构学报,2001,22(1):2-7.［15］曹忠民，李爱群. 钢筋混凝土梁柱节点最新抗剪通用分析模型的修正［J］.铁道工程学报,2005(6):28-31.
