核工程双钢板—混凝土结构抗震性能研究

发布时间：2018-07-01 11:03

本文选题：双钢板-混凝土结构 + 面外受力性能　；参考：《清华大学》2015年博士论文

【摘要】：双钢板-混凝土结构是一种采用钢板代替受力钢筋,将钢板外包于混凝土而形成的组合结构。与钢筋混凝土结构相比,双钢板-混凝土结构施工方便,同时兼具良好的受力性能和抗冲击性能,因而在我国第三代核电机组安全壳的设计中得到应用。目前我国关于此类结构的研究较少,设计方法也尚不明确。本文通过基本构件试验,对双钢板-混凝土结构的面外受力机理、滞回特性以及表面钢板的屈曲性能进行了研究,在此基础上建立了安全壳的整体有限元分析模型,通过数值计算对其抗震安全性能进行评估。主要工作和研究成果包括:(1)进行了7个钢板-混凝土组合板的面外静力加载试验。分析了钢板配置、抗剪连接程度及钢板厚度对组合板面外受力性能的影响。结果表明试件按完全抗剪连接设计时,受力机制与钢筋混凝土相似,但在钢板与混凝土的交界面会产生滑移效应。双钢板-混凝土试件的受压区钢板还会发生局部屈曲现象。(2)进行了3个双钢板-混凝土组合悬臂墙的面外拟静力加载缩尺试验。通过改变剪跨比和钢板厚度,得到了试件在不同破坏模式下的受力机理和滞回特性,验证了原型结构中距厚比取值的合理性和对拉钢筋对于试件面外抗剪的贡献。(3)采用一种分离式分层壳单元对组合板静力加载试验进行了有限元模拟,模型能够真实反映钢板和混凝土之间的界面滑移行为,计算结果与试验吻合良好。在此基础上,结合试验结果与有限元分析,给出了钢板-混凝土结构面外承载力和刚度的计算公式。(4)进行了10个双钢板-混凝土组合墙的轴压试验。分析了距厚比、钢板厚度以及栓钉布置形式对试件表面钢板屈曲性能的影响。根据本文的试验结果,同时结合国内外现有的试验数据,给出了表面钢板距厚比限值的计算公式。(5)对轴压试验进行了有限元模拟,考虑了混凝土对钢板的单边约束效应以及栓钉的锚固变形和滑移效应。通过有限元的补充分析,量化了栓钉锚固刚度、距厚比以及钢板初始缺陷对于钢板屈曲应力的影响,验证了所建议的距厚比限值公式的合理性。最后分析了栓钉布置形式影响钢板屈曲性能的深层次原因。(6)根据试验结果,校核了某安全壳双钢板-混凝土部分的设计参数,采用分层壳单元对整体结构建立了有限元分析模型,通过弹塑性动力时程分析,得到了结构在特大地震作用下的内力、变形和薄弱位置,对其抗震裕度进行了分析。
[Abstract]:Double steel plate-concrete structure is a kind of composite structure, which uses steel plate instead of steel bar and covers steel plate in concrete. Compared with the reinforced concrete structure, the double-plate-concrete structure is easy to construct, and has good mechanical performance and impact resistance, so it has been applied in the design of the third generation nuclear power unit containment in China. At present, there are few researches on this kind of structure in our country, and the design method is not clear. In this paper, the stress mechanism, hysteretic characteristics and buckling behavior of double steel plate-concrete structures are studied by means of basic component tests. Based on this, the integral finite element analysis model of containment is established. Its seismic safety performance is evaluated by numerical calculation. The main work and research results are as follows: (1) the outside static loading tests of 7 steel plate-concrete composite slabs are carried out. The influence of steel plate configuration, shear connection degree and steel plate thickness on the external mechanical properties of composite plate is analyzed. The results show that the mechanical mechanism of the specimens is similar to that of reinforced concrete, but the slip effect will occur at the interface between steel plate and concrete. The local buckling of the steel plate in the compression zone of the double-steel plate concrete specimen is also observed. (2) the pseudo-static compression scale tests of three double-plate-concrete composite cantilever walls are carried out. By changing the shear span ratio and the thickness of the steel plate, the mechanical mechanism and hysteretic characteristics of the specimens under different failure modes are obtained. The rationality of the distance to thickness ratio in the prototype structure and the contribution of the tensile steel bar to the out-of-plane shear resistance of the specimen are verified. (3) the static loading test of the composite plate is simulated by a separate layered shell element. The model can truly reflect the interface slip behavior between steel plate and concrete, and the calculated results are in good agreement with the test results. On this basis, combined with the experimental results and finite element analysis, the calculation formulas for the out-of-plane bearing capacity and stiffness of plate-concrete structures are given. (4) the axial compression tests of 10 double-plate-concrete composite walls are carried out. The effects of distance thickness ratio, steel plate thickness and pin arrangement on the buckling properties of steel plate on the surface of the specimen were analyzed. Based on the experimental results of this paper and the existing test data at home and abroad, the calculation formula of the limit value of the thickness ratio of the surface steel plate is given. (5) the axial compression test is simulated by finite element method. The single side restraint effect of concrete on steel plate and anchoring deformation and slip effect of bolt are considered. Through the supplementary analysis of finite element, the influences of anchoring stiffness, ratio of distance to thickness and initial defect of steel plate on the buckling stress of steel plate are quantified, and the rationality of the suggested formula of the limit value of distance to thickness ratio is verified. Finally, the deep reasons for the influence of pin layout on the buckling behavior of steel plate are analyzed. (6) based on the experimental results, the design parameters of the double-plate-concrete part of a containment are checked. The finite element analysis model of the whole structure is established by using the layered shell element, and the internal force, deformation and weak position of the structure under the action of a large earthquake are obtained through the elastoplastic dynamic time history analysis, and its seismic margin is analyzed.
【学位授予单位】：清华大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU398.9;TU352.11

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