纤维网增强复合墙体基本力学性能试验研究

发布时间：2018-04-14 13:12

本文选题：玄武岩纤维网 + ANSYS　；参考：《长沙理工大学》2013年硕士论文

【摘要】：连续玄武岩纤维（CBF）是前苏联经过30多年的研究开发的高科技纤维。它在整个生产和应用过程中无环境污染，属于绿色生态材料。玄武岩纤维在我国的发展才刚刚起步。它不仅性能优异、性价比高，而且有良好的抗拉强度及韧性，特别是在防护工程增强加固抗爆方面拥有广阔的应用前景。纤维增强类产品（FRP）在土木工程中的应用与研究可以分为两大类：一类是用于已有结构的加固与修复，这方面已取得较大的研究与应用成果；另一类于增强新建的结构，代替钢筋及其他形式的增强作用，在这方面国外的研究与应用发展的比较早，但在我国的研究却还处于起步阶段。因此本文拟对玄武岩纤维网（CBFN）增强复合墙体的基本力学特性实行试验研究分析。本文试验全部试件均采用KP1型承重多孔砖砌筑，砖块和砌筑砂浆的抗压强度均使用实测值，FRP材料采用连续玄武岩纤维网（CBFN）。根据《砌体基本力学性能试验方法标准》（GBJ129-90）的规定条例来制作试件和指导试验操作，分析CBF网增强砌体的加强特性，受力性能和失效形态等。本文研究的主要内容如下：首先，通过对12件连续玄武岩纤维网(CBFN)增强砖砌体试件和6件未增强对比试件的抗压试验，研究CBFN增强砌体抗压性能和效果。通过对每组试件的初裂荷载、破坏荷载、纵横向变形等数据的比较及观察不同增强方式下的增强效果、破坏特征，得出影响抗压强度的主要因素。通过对12件连续玄武岩纤维网（CBFN）增强多孔砖砖砌体试件和6件未增强对比试件进行抗剪试验，观察试件的破坏过程、最终破坏形式，分析不同的CBFN增强方式对砖砌体的受剪承载力及破坏形态的影响，并提出CBFN增强砖砌体试件的受剪承载力公式。通过对6组连续玄武岩纤维网(CBFN)增强多孔砖砌体试件的弯曲抗拉强度的试验研究，分析了CBFN增强砌体的效果、破坏形态和弯曲抗拉能力。试验结果表明，同一强度条件下的砂浆和块体，，沿齿缝截面破坏的砖砌体抗拉强度远远大于沿通缝截面破坏的砖砌体抗拉强度，说明砌筑方式对砖砌体的抗拉强度有很大影响。用CBFN增强砖砌体，其抗弯承载力明显提高，且表现为一定的延性特征，但增加CBFN层数作用不大。最后，采用ANSYS有限元对不同类型砌体结构的应力、应变和位移进行分析。需要对模型做一些基本的假定，不考虑砂浆与砖块的粘结力，建立符合真实试验情况的有限元模型。设置与实际材料特性相符合的实参数，根据众多因素（如材料性质和加载速度）来选用匹配的破坏准则。对砌体受力情况进行模拟加载，计算分析出与试验验结果的异同处。
[Abstract]:Continuous basalt fiber (CBF) is a high-tech fiber developed by USSR for more than 30 years.It has no environmental pollution in the whole process of production and application, so it belongs to green ecological material.The development of basalt fiber in China is just beginning.It not only has excellent performance, high ratio of performance to price, but also has good tensile strength and toughness. Especially, it has a broad application prospect in strengthening and strengthening anti-explosion protection engineering.The application and research of fiber reinforced products (FRP) in civil engineering can be divided into two categories: one is for strengthening and repairing existing structures, which have achieved great research and application results, and the other is for reinforced new structures.In place of reinforcing bar and other forms of reinforcement, the research and application in this field developed earlier in foreign countries, but the research in our country is still in its infancy.In this paper, the basic mechanical properties of the basalt fiber reinforced composite wall are studied experimentally.In this paper, all specimens are built with KP1 type load-bearing porous brick, and the compressive strength of brick and masonry mortar is measured using continuous basalt fiber mesh.According to the rules and regulations of GBJ129-90 (Standard for testing methods of basic Mechanical Properties of masonry), the specimens are made and the test operation is guided, and the strengthening characteristics, mechanical properties and failure modes of reinforced masonry with CBF net are analyzed.The main contents of this paper are as follows:Firstly, the compressive properties and effects of CBFN reinforced brick masonry were studied by means of the compressive tests of 12 continuous basalt fiber mesh reinforced brick masonry specimens and 6 unreinforced contrast specimens.By comparing the data of initial crack load, failure load and longitudinal and transverse deformation of each group of specimens, and observing the strengthening effect and failure characteristics of different strengthening ways, the main factors influencing the compressive strength are obtained.Through the shear tests of 12 continuous basalt fiber mesh reinforced porous brick masonry specimens and 6 unreinforced contrast specimens, the failure process and ultimate failure form of the specimens are observed.The influence of different CBFN reinforcement modes on the shear capacity and failure mode of brick masonry is analyzed, and the formula of shear bearing capacity of CBFN reinforced brick masonry specimens is put forward.Based on the experimental study on the flexural tensile strength of six groups of continuous basalt fiber mesh reinforced porous brick masonry specimens, the effect, failure form and flexural tensile capacity of CBFN reinforced masonry are analyzed.The test results show that the tensile strength of brick masonry destroyed along tooth joint section is much higher than that of brick masonry with the same strength, indicating that masonry construction mode has a great influence on the tensile strength of brick masonry.The flexural bearing capacity of brick masonry strengthened with CBFN is obviously increased, and it has a certain ductility characteristic, but it has little effect on increasing the number of CBFN layers.Finally, the stress, strain and displacement of different masonry structures are analyzed by ANSYS finite element method.It is necessary to make some basic assumptions on the model and establish the finite element model which accords with the real test condition without considering the bond force between mortar and brick.According to many factors (such as material properties and loading speed), the matching failure criteria are selected by setting the real parameters in accordance with the actual material properties.The load of masonry is simulated and the similarities and differences between the test results and the test results are calculated and analyzed.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU364

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