作者：李磊^1,2, 何翔^1,2, 孙敖¹, 王世合^1,2, 高杰¹

作者单位：1. 61489部队, 河南 洛阳 471023;
2. 河南省特种防护材料重点实验室, 河南 洛阳 471023

关键词：HRB500钢筋;混凝土梁;动态试验;屈服载荷;延性比

摘要：

为研究HRB500钢筋混凝土简支梁的受弯承载力，进行7组21根适筋梁的静、动态三分点弯曲加载试验，分别采用0.6%、1.0%两种配筋率，C40、C60两种强度等级的混凝土，3种加载速度，获得梁的截面应变分布曲线，以及开裂载荷、屈服载荷、极限载荷和延性比等参数。通过对比分析试验结果，认为在动态载荷作用下，平截面假定依然成立，梁的开裂载荷可提升1倍以上，屈服载荷和极限载荷有小幅提升。动态屈服载荷可采用静载时的计算方法进行计算，但需要将钢筋和混凝土的静态强度替换为动态强度。梁的延性比基本不受加载速度的影响，配筋率越高的梁延性比越低。

Static and dynamic experimental investigation on flexural bearing capacity of HRB500 reinforced concrete beam

LI Lei^1,2, HE Xiang^1,2, SUN Ao¹, WANG Shihe^1,2, GAO Jie¹

1. Unit 61489 PLA, Luoyang 471023, China;
2. He'nan Key Laboratory of Special Protective Materials, Luoyang 471023, China

Abstract: In order to study the flexural bearing capacity of HRB500 reinforced concrete simple supported beam,static and dynamic tests of three dividing point loading were carried out.21 beams in 7 groups were tested under 3 different loading speeds.The reinforcement ratio was 0.6% and 1.0% respectively,and the strength grade of concrete was C40 and C60 respectively.The strain distribution in the section,cracking load,yield load,ultimate load and ductility ratio were obtained.The comparative analysis of the experiment results show that,under dynamic load,plane section assumption is also tenable,and the cracking load of beam is significantly raised more than one time.The yield load and ultimate load increased a little.The dynamic yield load can be calculated by the method derived from static load condition,but the static strength of rebar and concrete must be replaced by the dynamic strength.The ductility ratio of beam is basically not influnced by loading speed,but it is lower when the reinforcement ratio is higher.

Keywords: HRB500 rebar;concrete beam;dynamic experiment;yield load;ductility ratio

2016, 42(10): 49-55  收稿日期: 2016-5-5;收到修改稿日期: 2016-6-18

基金项目: 河南省科技创新人才计划（154200510028）

作者简介: 李 磊(1980-),男,河南开封市人,助理研究员,博士,主要从事工程防护材料及其试验技术研究。

参考文献

[1] 混凝土结构设计规范:GB 50010-2010[S]. 北京:中国建筑工业出版社,2011.
[2] 林峰,顾祥林,匡昕昕,等. 高应变率下建筑钢筋的本构模型[J]. 建筑材料学报,2008,11(1):14-20.
[3] 李敏,李宏男. 建筑钢筋动态试验及本构模型[J]. 土木工程学报,2010,43(4):70-75.
[4] MALVAR L J, ROSS C A. Review of strain rate effects for concrete[J]. ACI Materials Journal,1998,95(6):735-739.
[5] MALVAR L J, ROSS C A. Review of strain rate effects for concrete in tension[J]. ACI Materials Journal,1999,96(5):614-616.
[6] 陈肈元. 爆炸载荷下的混凝土结构性能与设计[M]. 北京:中国建筑工业出版社,2015:103-109.
[7] 钱七虎,王明洋. 高等防护结构计算理论[M]. 南京:江苏科学技术出版社,2009:37-45.
[8] 方秦,柳锦春. 地下防护结构[M]. 北京:中国水利水电出版社,2010:179-188.
[9] 都浩,邓芃,杜荣强. 爆炸荷载作用下钢筋混凝土梁动力响应的数值分析[J]. 山东科技大学学报(自然科学版),2010,29(6):50-54.
[10] 李振宝,宝小超. 加载速率对钢筋混凝土梁动态性能的影响[J]. 防灾减灾工程学报,2011,31(6):627-631.
[11] 肖诗云,许东. 钢筋混凝土梁正截面率相关特性分析[J]. 防灾减灾工程学报,2012,32(2):152-157.
[12] 李敏,李宏男. 钢筋混凝土梁动态试验与数值模拟[J]. 振动与冲击,2015,34(6):110-115.
[13] 混凝土结构试验方法标准:GB/T 50152-2012[S]. 北京:中国建筑工业出版社,2012.
[14] 李磊,何翔,王世合,等. 新型高强钢筋快速拉伸试验研究[J]. 防护工程,2015,37(5):16-21.