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粘贴加固混凝土梁的剥离研究 【作者】鲍安红 【导师】殷学纲

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!s0IT5o]u0作者鲍安红导师殷学纲水利论文 AFg*J6z%YS
【作者基本信息】重庆大学,固体力学,2005年,博士水利论文#D#nLqu0i5qPn

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【中文摘要】 本文对表面粘贴加固混凝土梁的剥离进行了研究。通过综述加固梁的研究现状,阐述了加固梁的基本理论,说明了进行剥离研究的必要性。提出了加固梁的有限元模型,特别是针对剥离研究的加固梁的FEM 模型,提出了加固梁的剥离准则,并基于所提出的FEM 模型和剥离准则,应用ANSYS 软件,以粘钢加固梁为例,进行了剥离的仿真分析研究,提出粘钢加固梁考虑剥离的承载力修正的计算方法。具体研究内容如下: 本文说明了对粘贴加固混凝土梁进行剥离研究,以及在剥离理论上完善加固梁设计计算方法的必要性。表面粘贴加固混凝土梁,利用了混凝土抗压性能好,粘贴加固材料抗拉性能好的特性,来提高梁的承载力。在粘贴加固混凝土梁的理论中,对于加固混凝土梁的承载力计算,目前采用的是极限强度理论,把外部粘贴的加固材料等同于混凝土梁内部钢筋,沿袭了钢筋混凝土结构的强度理论来对加固梁进行设计计算,认为外部加固材料提供给梁的抗力基于加固材料的抗拉强度,忽略了加固材料的剥离影响。因此对表面粘贴加固混凝土梁的剥离进行研究,以确定表面加固材料剥离对梁承载力的具体影响,以此完善加固梁的设计计算方法,是很有必要的。提出了粘贴加固混凝土梁的有限元模型,并以...更多ANSYS 为平台,对各种材料选用相应的本构模型,根据加固混凝土梁的特点,按分离式的模型提出了加固梁的有限元模型。其中混凝土选用8 节点六面体的SOLID65 单元,胶层选用8 节点六面体SOLID45 单元,钢筋采用2 节点的LINK8 单元,表面加固材料视材料种类和厚度选取合适的单元类型,利用ANSYS 特有的‘生死单元’设置混凝土裂缝,并对裂缝处单元进行细化,提出了针对剥离分析的粘贴加固混凝土梁的有限元模型。提出了粘贴加固混凝土梁的剥离准则。为对表面粘贴加固混凝土梁的表面加固材料的剥离现象进行理论研究和有限元分析,本文提出了“剥离准则“的概念,即判断剥离的标准。提出了表面粘贴加固材料的剥离准则——“界面混凝土的主应力达到混凝土抗拉强度极限”,并提出了表面加固材料的剥离准则表达式,用碳纤维加固混凝土梁的有限元分析来验证了所提出剥离准则的合理性。研究了梁底粘钢的加固梁的底钢板剥离,提出了梁底钢板的剥离验算式。文中把提出的有限元模型和剥离准则应用于粘钢加固梁中,对梁底钢板的剥离进行研究。首先对梁底钢板的剥离进行了试验研究,发现梁底钢板的剥离对梁的抗弯承载力有影响,据此提出在梁底粘钢加固混凝土梁时,需要对梁底钢板的剥离进行验算。对照试验建立了加固梁的有限元模型,利用混凝土的开裂准则和梁底钢  还原水利论文5Bs#p&Al"t+t

5Dl_(ynFg0【英文摘要】 The desquamation of affixed reinforced RC beam is studied in this paper. It shows that the study for the desquamation of affixed reinforced RC beam is necessary. The FEM model and the peel-off-judge are present. The beam bonded steel plate is studied. The study content is as follows. Because the press capability of concrete and the pull capability of sticking material are good, the bear capability of the concrete beam will be advanced when the beam is reinforced. In the theory, the limit intensity theory is used when the bear capability of the reinforced beam is calculated. The sticking material is taken as steel bars inside concrete. And the resisting capability, which is supplied by sticking material, is based on intensity of the sticking material. And the phenomenon of the sticking material peeling off from the concrete beam is ignored. So the study on the sticking material’s peeling off is necessary. In order to avoid error of experimentation and use virtue of finite element method...更多, A model of RC beam bonded with sticking material is built with the finite element (FEM) software ANSYS. It bases on disposed particularity of material and the mechanism capability to adopt independent model. The concrete takes 8-node hexahedron elements SOLID65. The sticking material is taken 8-node hexahedron elements SOLID45 or other appropriate elements. The mucus is taken 8-node hexahedron elements SOLID45. The steel bar is taken 2-node linearity elements. A series of crack models are built by skill element to predigest the model. And the elements of crack were diminished. At the same time, the concept of peel-off-judge is brought forward. Because the desquamating judge of the sticking material is based on experimentation phenomena. But the desquamating judge needs to be definitude in theory. Now, there isn’t a judge on desquamation. The desquamating phenomenon shows that sticking material on the interface-concrete is mangled. And the criterion CECS90:25 ordains that the wreck of steel plates peeling off must be the wreck of interface-concrete. So the desquamating judge on sticking material is confirmed that the stress of interface-concrete achieves the limit. The desquamating judge was used on the beam that was reinforced with carbon fibrin, which proves the use was validated and it is rationality. In this paper checking formula of the desquamation of steel plate is deduced. The element model of the beam bonded steel plate is built by experimentation. And the whole process of RC beam bonded with steel plate is researched by finite element method. Conclusion is that peel load of steel plate is proportional with bending moment. So the formula of desquamation stress of steel plate is deduced by elastic analysis and finite element method. In the formula, influencing coefficient of loading and desquamation force is denoted. And the influencing coefficient at bending moment is stands for. In this paper the element model of the beam is constituted to describe the course bonding steel plates by the technics. It analyzes the stress of interface concrete to detrude the affection of stress that is produced by support load. We can find that the support load will affect steel plates desquamation. In this paper the thickness of steel plates is analyzed. According to the analysis, we can find that the resist curve capability will increase when the thickness of steel plate increase. But at the same time the stress of interface concrete will increase in a quick speed. It will bring on steel plates desquamation. The thickness of mucus is analyzed in this paper. We find that the thickness of mucus cannot affect steel plates desquamation. Compared with test, the applicable condition of the formula is that the thickness is 2mm to 4mm and that the number of the layer is 1 to 2 by analyzing the thickness and layer of the steel plate. In this paper the formula of the resist shearing capability with U shaped steel plate reinforced beam is modified. By experiment and finite element model, it is concluded that enhancement of resist-shearing force is correlative with sticking area when the inclined plane of RC beam bonded with steel sheet supports loading. The resist-shearing force is different when steel plate yields or desquamates. It is bigger when steel plate yields. The sticking area is bigger, the resist-shearing force is better by analyzing the stress of interface, and at the same time steel plate desquamation will delay. So the amendable formula on the U shaped steel plate reinforced beam resist-shearing force is identified. In the formula, the influencing coefficient of the side of U shaped steel plate is considered. In this paper the calculate method is improved by studying desquamation of reinforced RC beam stuck with steel plate. And it shows that the FEM model and the peel-off-judge line are reasonable.  还原

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【中文关键词】 表面粘贴加固混凝土梁; 有限元模型; 剥离准则; 剥离验算式; 抗剪承载力修正式
RkA%JmA7o0【英文关键词】 affixed reinforced RC beam; the FEM modeling; the desquamating judge; checking formula of the desquamation; the modify formula of the resist shearing capability
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TAG: 导师 混凝土 鲍安红 殷学纲 剥离
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