HTRB600钢筋混凝土梁动态损伤机理和承载力研究  

Dynamic failure mechanism and flexural capacity of HTRB600 reinforced concrete beams

作　　者：张丛琨 张仲昊 汪维 李磊 魏久淇 ZHANG Congkun;ZHANG Zhonghao;WANG Wei;LI Lei;WEI Jiuqi(Key Laboratory of Impact and Engineering of Ministry of Education of China,Ningbo University,Ningbo 315211,China;Institute of Defense Engineering,Academy of Military Sciences of Chinese People’s Liberation Army,Luoyang 471023,China;Henan Provincial Key Laboratory of Special Protective Materials,Luoyang 471023,China)

机构地区：[1]宁波大学冲击与安全工程教育部重点实验室,浙江宁波315211 [2]中国人民解放军军事科学院国防工程研究院,河南洛阳471023 [3]河南省特种防护材料重点实验室,河南洛阳471023

出　　处：《宁波大学学报（理工版）》2024年第6期51-60,共10页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金(11302261,11972201);河南省科技创新人才计划(154200510028)。

摘　　要：近年我国大力推广热轧高强度热处理钢筋(Heat-Treated Ribbed Bars,HTRB)等新型高强钢筋(High-Strength Steel Bars,HSSB),而钢筋混凝土(Reinforced Concrete,RC)构件的动力特性和破坏形式受到加载速率的影响而发生明显的改变.为研究配置HTRB600的RC梁的动态力学性能,设计了不同加载速度和不同混凝土强度的4组试验.结果表明:梁在动态加载下的破坏过程可分为弹性阶段、带裂缝工作阶段和破坏阶段.屈服荷载随着加载速度的增加而增加,将材料静态强度替换为动态强度后,规范中的公式可以准确预测梁的屈服弯矩.使用LS-DYNA程序建立了精确的有限元模型,通过数值模拟分析了梁的损伤机理和极限承载力,发现梁的极限荷载随着加载速度的提高而增大,极限挠度和延性比随着加载速度的增加而减小,混凝土强度对梁的极限承载力影响较小.In recent years,China has vigorously promoted the use of new high-strength steel bars(HSSB) such as HTRB(heat-treated ribbed bars),and the dynamic characteristics and failure modes of reinforced concrete(RC) members vary significantly due to the influence of loading rates.In order to study the dynamic mechanical properties of RC beams reinforced with HTRB600,four groups of tests with different loading speeds and different concrete strengths were designed.The results show that the failure process of the beams under dynamic loading can be divided into three stages,including elastic stage,working stage with cracks and failure stage.The yield load increases with the increase of loading speed.After replacing the static strength of material with dynamic strength,the formula in the specification can accurately predict the yield bending moment of the beams.An accurate finite element model was established using LS-DYNA,and the failure mechanism and the ultimate flexural capacity of the beams were analyzed by numerical simulation.The results suggest that the ultimate load of the beams increases with the increase of the loading speed,the ultimate deflection and the ductility ratio both decrease with the increase of the loading speed,and the concrete strength has little effect on the ultimate flexural capacity.

关 键 词：高强钢筋 钢筋混凝土梁 抗弯承载力 动态加载 数值模拟 损伤机理 

分 类 号：TU31[建筑科学—结构工程]