CAJ | 학술논문

为了揭示强震下单层网壳结构的动力失效机理，从考虑材料损伤累积效应的角度出发，基于塑性应变和能量损耗理论建立应变损伤弹塑性本构关系，提出将 B-R 运动准则和杆件塑性应变能密度曲线结合起来，作为结构动力失稳的判断标准。应用动态增量(IDA)法，对一Kiewitt-8型单层球面网壳结构进行地震作用下动力稳定分析，得出考虑材料损伤累积效应将显著降低结构的动力稳定临界荷载等结论，为该类结构震后修复和抗震性能的评估提供依据。
위료게시강진하단층망각결구적동력실효궤리，종고필재료손상루적효응적각도출발，기우소성응변화능량손모이론건립응변손상탄소성본구관계，제출장 B-R 운동준칙화간건소성응변능밀도곡선결합기래，작위결구동력실은적판단표준。응용동태증량(IDA)법，대일Kiewitt-8형단층구면망각결구진행지진작용하동력은정분석，득출고필재료손상루적효응장현저강저결구적동력은정림계하재등결론，위해류결구진후수복화항진성능적평고제공의거。
To address the dynamical instability of single-layer latticed shells under earthquake excita-tion,proceeding from the damage accumulative effect of steel material,the constructive relationship be-tween strain and damage was first set up on the basis of the theory of both plastic strain and energy dissi-pation.Then,the criterion for dynamic stability by means of B-R kinetic criterion in combination with plastic strain energy density was put forward.The method of incremental dynamic analysis was used to study the dynamic stability of a Kiewitt-8 type single-layer latticed shell under earthquake excitation when considering the damage accumulation effect.Finally,some conclusions are obtained that strain-damage constitutive mode can reflect the features of structural failure and greatly affect the structure,which may be helpful in engineering repair and the estimation of seismic capacity.