基于RHT模型的冲击荷载作用下钢筋混凝土梁动力响应分析  

Analysis of dynamic response of reinforced concrete beams based on impact load of RHT model

作　　者：李广博[1] 罗乙杰 LI Guang-bo;LUO Yi-jie(School of civil engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,吉林长春130118

出　　处：《吉林建筑大学学报》2022年第1期11-16,共6页Journal of Jilin Jianzhu University

摘　　要：为了研究冲击荷载下钢筋混凝土结构的响应规律,提出RHT本构模型,通过数值模拟研究冲击作用下钢筋混凝土梁的抗弯性能和损伤机理;通过动态摩擦理论建立冲击荷载接触模型,基于剪切变形理论和完全积分法计算排除沙漏模式,提高计算精度,由RHT本构模型输出损伤因子,辅以P-alphaEOS方程模拟混凝土压实效应,输出危险截面位移,利用结构截面损伤因子对损伤评估进行建模.结果表明,基于RHT本构模型损伤因子的评估函数模型可以有效地描述梁体受冲击的损伤分布,箍筋间距和混凝土保护层厚度均对混凝土损伤分布和抗弯性能具有影响.In order to study the response law of the reinforced concrete structure under the impact load,the RHT constitutive model was proposed to study the anti-bending performance and damage mechanism of reinforced concrete beam under the impact by numerical simulation.The impact load contact model was established by dynamic friction theory,and the exclusion of the hover mode was calculated based on the shear deformation theory and the complete integration method to improve the calculation accuracy.The damage factors were output from the RHT constitutive model and P-alpha EOS equation simulated the concrete compression effect,and the dangerous section displacement was output.The demage assessment model was build by using structural cross-sectional damage factors.Constitutire the results show that the evaluation function model based on damage factor of RHT constitutive model can effectively describe the damage distribution of beams,and the stirrup spacing and the thickness of concrete protective layor have an effect on the distribution of concrete damage and the amti-curved performance.

关 键 词：冲击荷载 钢筋混凝土梁 RHT本构模型 损伤函数 抗弯性能 

分 类 号：TU528.7[建筑科学—建筑技术科学]