摘要
提出了一种预制装配式矩形钢筋混凝土管廊节段三维恢复力数值模型,采用非协调参数Drucker-Prager平面Cap模型模拟混凝土性质,结合自定义的黏结滑移单元,并基于ADINA软件建立了三维钢筋与混凝土分离式模型。在试验荷载设计时,结合反应位移法物理概念和理论基础,将管廊在土体中实际受力情况和土体对管廊的约束作用分别进行了简化处理。利用预制装配式管廊节段的低周反复荷载试验与数值模拟结果对比,分析了试件的滞回曲线、骨架曲线、耗能能力、残余位移、延性等抗震性能指标,从而验证笔者的数值模型合理性和可靠性;指出了顶板与侧壁连接处的倒"L"形节点区为地震破坏薄弱区。以上研究成果可为进一步研究预制装配式管廊节段的地震灾变行为研究提供参考。
A 3 D recovery force numerical model of precast assembled municipal tunnel(simplified as PAMT model)is proposed.Cap modified yield criterion for Drucker-Prager model is used to represent modeling concrete members.The bond stress versus slip relationship about steel bar and concrete is simulated.ADINA are used to establish a reinforced concrete finite element method model which is discrete model.Based on the physical concept and basic principle of the response deformation method,The actual load of pipe gallery in soil and the constraint of soil to pipe gallery are simplified respectively during the design experiment.In order to study the seismic behavior of PAMT model,a low cyclic loading test was designed on the analysis of hysteresis curve,skeleton curve,stiffness degradation,energy dissipation capacity,horizontal residual displacement and ductility.So the numerical simulation of the low cyclic loading test of PAMT models is carried out and the results are compared with the test results.By comparison,it is verified that the reliability of the numerical model and rationality.It points out that the inverted"L"area of the roof and side wall joints is the weak zone of earthquake damage.These findings can provide a reference for the further study of segmental prefabricated municipal tunnel seismic catastrophic behavior research.
作者
杜青
崔东来
卿龙邦
DU Qing;CUI Donglai;QING Longbang(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)
出处
《混凝土》
CAS
北大核心
2019年第12期142-147,共6页
Concrete
基金
国家自然科学基金(51309073)
河北省自然科学基金资助项目(E2014202257)
