钢筋混凝土构件受扭承载力对比分析  

Comparative Analysis of Torsional Capacity for Reinforced Concrete Members

作　　者：田磊[1,2] 贡金鑫[1] 魏巍巍[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]中交水运规划设计院有限公司,北京100007

出　　处：《建筑科学与工程学报》2010年第4期57-68,共12页Journal of Architecture and Civil Engineering

基　　金："十一五"国家科技支撑计划项目(2006BAJ01B06-06)

摘　　要：对中国、美国和欧洲规范中钢筋混凝土纯扭构件的受扭承载力和最小配筋率要求进行了对比,并基于各国钢筋混凝土纯扭构件受扭承载力的试验结果对受扭承载力进行可靠度分析,最后对各规范中弯剪扭共同作用下的钢筋混凝土构件的配筋计算方法、最小配箍率和截面限制条件进行了研究。结果表明:对于纯扭构件,中国规范的受扭承载力由钢筋和混凝土受扭2个部分组成,美国和欧洲规范仅考虑钢筋受扭;对于纯扭构件的最小配箍率,美国规范最大,中国规范最小,欧洲规范居中;对于纯扭构件受扭时的可靠指标,在恒荷载与活荷载组合情况下,按中国规范计算的最大,欧洲规范居中,美国规范最小;在恒荷载与风荷载组合情况下,中国、美国和欧洲规范较为接近;对于弯剪扭共同作用下的钢筋混凝土构件,按美国和欧洲规范计算配筋要比中国规范保守,中国、美国和欧洲规范的剪扭相关曲线均接近1/4圆,中国和欧洲规范中的剪扭构件最小配箍率较为接近,大于美国规范。For reinforced concrete pure torsion member,torsional capacity and minimum reinforcement ratio based on GB 50010—2002,ACI 318-08 and EN 1992-1-1：2004 were compared and analyzed,then reliability analysis was performed based on a lot of experimental data about torsional capacity of reinforced concrete members from different sources.Finally,the calculation methods of reinforcement,minimum reinforcement ratio and section restraint condition of reinforced concrete members under the combined action of bending moment,shear force and torque were compared and analyzed.Results show that for pure torsion member,torsional capacity in GB 50010—2002 is composed of torques carried by reinforcements and concretes,but only torque carried by reinforcements is considered by ACI 318-08 and EN 1992-1-1：2004.For minimum stirrup ratio of pure torsion member,ACI 318-08 is larger than EN 1992-1-1：2004,and GB 50010—2002 is the smallest.For reliability indexes of pure torsion member in torsion,under combined dead load and live load,GB 50010—2002 is larger than EN 1992-1-1：2004,and ACI 318-08 is the smallest,whereas the three codes are almost the same under combined dead load and wind load.For the reinforced concrete member subjected to combined action of bending moment,shear force and torque,ACI 318-08 and EN 1992-1-1：2004 are relatively conservative compared with GB 50010—2002 for torsion design method.The shape of interaction curve under shear and torsion for three codes are all close to quadrant of a circle.Under combined action of shear force and torque,minimum stirrup ratios of GB 50010—2002 and EN 1992-1-1：2004 are approximate,and greater than ACI 318-08.

关 键 词：钢筋混凝土构件 受扭承载力 扭矩 可靠度分析 

分 类 号：TU375.1[建筑科学—结构工程]