截面尺寸误差对混凝土框架节点抗震性能影响的试验研究
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摘要
研究截面尺寸的施工误差对混凝土框架结构在低周往复荷载作用下节点滞回性能的影响。为此,制作了3个配筋相同、截面尺寸误差不同、轴向长度相同十字形框架节点构件。按照相同轴压比对试件施加轴向力,水平方向分别采用力和位移加载方式,研究不同误差的3个节点在低周往复荷载下的性能。得到了3个误差不同的试件的滞回曲线、骨架曲线。试验结果表明:超出现行规范允许值的不同误差的试件开裂荷载、破坏特征是不同的;在相同的轴压比条件下,截面尺寸相对较大的试件相对于截面较小的构件,耗能系数较大10%左右;截面尺寸大的试件相对于截面尺寸较小的试件,前者经历的最大荷载明显大于截面尺寸误差为负值的试件,两者相差达到38%。在相同加载制度下正误差的试件极限位移大于误差为负值的试件,两者相差为5%,前者的变形能力大于后者。因而混凝土框架结构施工环节应严格控制截面尺寸,避免截面尺寸小于设计值的情况,以保证框架结构在动荷载作用下具有良好的抗震性能。
To study the influence of beam-column joints' dimension errors induced by the construction process on the seismic performance of reinforced concrete frame joint,three beam-column-joint samples in cross shape,which had the identical longitudinal length,reinforced bars and different section dimensions,had been made;The vertical concentrated force were loaded at the top end of column,while horizontal reversed cyclic loading were applied at the corner of the loading frame according to the designed loading program.The cracked load,dissipation capacity and load-displacement hysteretic curve were obtained.The results demonstrate that dissipative coefficients of large dimensional sample is roughly 110% as large as the coefficient of smaller sample,the history maximum displacement of tested samples with larger section are 38% larger than that of smaller specimens,and the deformed capacity with larger section dimension is 5% stronger than that of the specimens with smaller section dimension under the same constant axial loading and horizontal cyclic loading.To make the reinforced concrete frame structure have good ductility and energy dissipation capacity,measures must be taken to control the errors of dimensions strictly during the construction process and avoid the real dimension being smaller than designing section size value.
To study the influence of beam-column joints' dimension errors induced by the construction process on the seismic performance of reinforced concrete frame joint,three beam-column-joint samples in cross shape,which had the identical longitudinal length,reinforced bars and different section dimensions,had been made;The vertical concentrated force were loaded at the top end of column,while horizontal reversed cyclic loading were applied at the corner of the loading frame according to the designed loading program.The cracked load,dissipation capacity and load-displacement hysteretic curve were obtained.The results demonstrate that dissipative coefficients of large dimensional sample is roughly 110% as large as the coefficient of smaller sample,the history maximum displacement of tested samples with larger section are 38% larger than that of smaller specimens,and the deformed capacity with larger section dimension is 5% stronger than that of the specimens with smaller section dimension under the same constant axial loading and horizontal cyclic loading.To make the reinforced concrete frame structure have good ductility and energy dissipation capacity,measures must be taken to control the errors of dimensions strictly during the construction process and avoid the real dimension being smaller than designing section size value.
引文
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[2]郭子雄,吕西林.高轴压比下RC框架柱的变形特征及滞回特性试验研究[C].第五届全国地震工程学术会议论文,1999.
[3]傅剑平,等.考虑轴压比影响的钢筋混凝土框架内节点抗震性能试验研究[J].重庆建筑大学学报,2000(Z1).
[4]张国军,吕西林,白国良.周期反复荷载作用下高轴压比框架柱抗震性能的试验研究[J].地震工程与工程振动,2005(6):70-75.
[5]傅剑平,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(1):40-46.
[6]宝小超,等.RC框架节点核芯区剪切破坏-抗震性能试验[J].世界地震工程,2009(3):61-66.
[7]周湘赞,孙飞飞,顾祥林.钢筋混凝土框架梁柱节点的分析模型[J].工程力学,1999(Z2):342-347.
[8]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(1):2-7.
[9]王红囡,刘华波.混凝土结构的破坏准则与ANSYS[J].工程力学,2002(增刊).
[10]傅剑平.钢筋混凝土框架节点抗震性能与设计方法研究[D].重庆大学,2002.
[11]徐晓阳,马宏伟,张兴虎.平面十字形节点试验的总结[J].四川建筑科学研究,2003(3):28-30.
[12]吴可训,叶献国,武士军.钢筋混凝土非线性有限元及ANSYS中混凝土本构关系研究[C].第十三届全国结构工程学术会议,2004.
[13]陆浩亮,李思明,金国芳.梁柱不同混凝土强度的高层框架节点试验和有限元分析[J].力学季刊,2004(1):129-134.
[14]卢明奇.有限元法研究钢管混凝土框架的滞回性能[J].武汉大学学报:工学版,2005(4):59-62.
[15]GB 50204—2002,混凝土结构工程施工质量验收规范[S].北京2,002.
[16]GB 50152—96,混凝土结构试验方法标准[S].北京:中国建筑工业出版社,1992.
[17]赵宪忠,顾祥林,沈祖炎.高层建筑混凝土结构施工误差分析[J].工程力学,1996(增刊):674-678.
[18]NOWAK A S,CARR R I.Sensitivity analysis for structural errors[J].Journal of the structural engineering,1985(8):1734-1746.
[19]DRYSDALE R G.Placement errors for reinforcing in concrete column[J].ACI Journal,1975(1):9-15.
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