预应力型钢混凝土框架梁弯矩调幅系数影响因素分析*
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(1 济南大学土木建筑学院，济南 250022；2 济南大学工程结构与健康监测研究所，济南 250022；3 同济大学土木工程学院建筑工程系，上海 200092；4 山东省工程建设标准定额站，济南 250001)［摘要］采用ABAQUS非线性有限元分析方法，分析了预应力度、有效预应力、预应力筋反弯点长度与线形、含钢率及截面相对受压区高度等因素对预应力型钢混凝土框架梁弯矩调幅系数的影响。研究表明：预应力度、含钢率及截面相对受压区高度对预应力型钢混凝土框架梁弯矩调幅系数影响较显著，随着预应力度、截面相对受压区高度的降低及含钢率的增加，弯矩调幅系数增大；预应力筋的有效预应力、预应力筋反弯点长度与线形的变化可以改变框架梁次弯矩，从而对框架梁弯矩调幅系数产生影响。通过对弯矩调幅系数的分析，建议预应力度λ不宜大于0.6，经济合理含钢率为5%左右，截面相对受压区高度不宜大于0.32。［关键词］预应力; 型钢混凝土; 框架梁; 内力重分布; 弯矩调幅中图分类号：TU378.4 文献标识码：A 文章编号：1002-848X(2015)05-0080-06Influence factors analyses on moment modulation coefficient of prestressed steel reinforced concrete frame beamGao Feng1,2, Xiong Xueyu3, Zhang Shaohong4(1 School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China; 2 Institute of Civil Engineering and Health Monitoring, University of Jinan, Jinan 250022, China; 3 Department of Building Engineering, College of Civil Engineering, Tongji University, Shanghai 200092,China; 4 Engineering Construction Standards Quota Station of Shandong Province , Jinan 250001, China )Abstract: Using nonlinear finite element analysis method with ABAQUS, influences of factors on the moment redistribution coefficient of prestressed steel reinforced concrete frame beams were researched, including the prestressing degree, effective prestressing, inflection point length and linearity of prestressing tendon, steel ratio and relative height of compression zone. The research shows that the effects of the prestressing degree, steel ratio and relative height of compression zone are remarkable, while the moment redistribution coefficient increases as the decrease of prestressing degree and relative height of compression zone and the increase of steel ratio. Secondary moment of frame beams are decided by the effective prestressing, inflection point length and linearity of prestressing tendon，which impacts on the moment redistribution coefficient of the frame. Based on the analysis on moment redistribution coefficient, some proposals were put forward, including prestressing degree λ should not be greater than 6%，reasonable steel ratio is about 5% and relative height of compression zone should not be more than 0.32.Keywords: prestressing; steel reinforced concrete; frame beam; internal force redistribution; moment modulation*住房和城乡建设部研究开发项目（2014-K2-029），山东省住房城乡建设科学技术计划项目（KY027），国家自然科学基金资助项目(51178328)。作者简介：高峰，博士，讲师，Email：gaofenglike@163.com。参考文献［1］熊学玉，高峰.预应力型钢混凝土框架试验研究及分析［J］.四川大学学报:工程科学版，2011,43（6）：1-8.［2］高峰,熊学玉.预应力型钢混凝土框架结构竖向反复荷载作用下抗震性能试验研究［J］.建筑结构学报,2013,34(7): 62-71.［3］熊学玉，高峰，苏小卒.预应力型钢混凝土框架试验研究和设计理论［J］.湖南大学学报：自然科学版,2012,39（8）:19-26.［4］王钧，邬丹，郑文忠.预应力H型钢混凝土简支梁正截面受力性能试验［J］.哈尔滨工业大学学报：自然科学版，2009，41(6):22-27.［5］傅传国，李玉莹，梁书亭.预应力型钢混凝土简支梁受弯性能试验研究［J］.建筑结构学报，2007，28（3）：62-73.［6］郑文忠，王钧，韩宝权，等.内置H型钢预应力混凝土连续组合梁受力性能试验研究［J］.建筑结构学报，2010，31(7):23-31.［7］熊学玉，高峰.预应力型钢混凝土框架弯矩调幅试验研究［J］.华中科技大学学报：自然科学版,2012,40（11）：1-5.［8］JEEHO LEE, GREGORY L FENVES. Plastic-damage model for cyclic loading of concrete structures［J］. Journal of Engineering Mechanics, 1998，124（8）：892-900.［9］HU HUANTIE, LIN FUMING, JAN YINYUAN. Nonlinear finite element analysis of reinforced concrete beams strengthened by fiber-reinforced plastics［J］. Composite Structures, 2004, 63(2):271-281.［10］雷拓，钱江，刘成清.混凝土损伤塑性模型应用研究［J］.结构工程师，2008，24(2):22-27.［11］GB 50010—2010 混凝土结构设计规范［S］.北京:中国建筑工业出版社，2011.［12］李红.型钢与混凝土粘结性能的试验研究［D］.西安:西安建筑科技大学,1995.
