摘要
为了合理评估严寒环境下在役钢筋混凝土(RC)剪力墙的抗震性能,采用相对动弹性模量为冻融损伤系数,结合修正Petersen模型构建了不均匀冻融损伤模型;基于经过准确性验证的既有公式建立了完好RC剪力墙剪切恢复力模型,进而通过分析冻融损伤RC剪力墙实测剪应变和剪力受参数影响的变化趋势,采用多参数回归建立了冻融损伤RC剪力墙剪切恢复力模型;基于既有材性实测数据建立了不均匀冻融损伤黏结强度模型,同时结合既有钢筋黏结滑移模型通过理论推导建立了不均匀冻融损伤纵筋滑移模型;结合所建立的不均匀冻融损伤模型、冻融损伤剪切滞回模型、冻融损伤不均匀的黏结强度-滑移模型,提出了冻融损伤剪力墙构件数值模型.最后采用8个不同参数冻融损伤RC剪力墙的拟静力实测数据对本文所提的数值模型的准确性进行了验证.结果表明:本文建立的数值模型可较准确地模拟冻融损伤RC剪力墙低周往复下的力-变形关系,可用于冻融环境下RC剪力墙的抗震性能评估.
To realize reasonable evaluation of the seismic behavior of in-service reinforced concrete(RC)shear walls under a frost action environment,using the relative dynamic elastic modulus as the freeze-thaw damage coefficient and combining with the modified Petersen model,a non-uniform freeze-thaw damage model is constructed.With the existing formula by accurately verified,the shear hysteretic model of intact RC shear walls is established.Then,by analyzing the variation trend of shear strain and shear force of the frozen-thawed damaged RC shear wall affected by parameters,the shear hysteretic model of frost-damaged RC shear wall is established by multiparameter regression analysis.Based on the existing material data,the bond strength model of uneven freeze-thaw damage is established.At the same time,combined with the existing bond-slip model,the slip model of uneven frozen longitudinal reinforcement is established through theoretical derivation.Combined with the established nonuniform freeze-thaw damage model,freeze-thaw shear hysteretic model,and freeze-thaw non-uniform bond strength slip model,a numerical model of freeze-thaw damaged shear wall components is proposed.Finally,the accuracy of the proposed numerical model is verified by using the quasi-static measured data of 8 freeze-thaw damaged RC shear walls with different parameters.The results show that the numerical model established in this paper can accurately simulate the load-deformation relationship of freeze-thaw damaged RC shear walls under low-cycle cyclic loading,and can be used to evaluate the seismic performance of RC shear walls under freeze-thaw environment.
作者
荣先亮
卢博辽
张琦玉
黄炜元
郑山锁
张艺欣
RONG Xianliang;LU Boliao;ZHANG Qiyu;HUANG Weiyuan;ZHENG Shansuo;ZHANG Yixin(College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education(Tongji University),Shanghai 201804,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第9期56-68,共13页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划项目(2019YFC1509302)
陕西省重点研发计划项目(2021ZDLSF06-10)
福建省自然科学基金青年创新项目(2021J05051)。
