混凝土在不同约束下局部受压的破坏分析
发布时间：2018-12-25 18:18
【摘要】：由于混凝土结构在局压荷载作用下承载力不足带来的工程事故逐年增多,混凝土局部受压的问题变得不容忽视。在以往的工程中,对于混凝土局压问题一般采取布置螺旋箍筋或钢筋网片的方法以增强混凝土局压部位的抗压强度,但抗局压效果并不明显,而且造成了大量的钢材浪费。随着预应力技术的发展,为解决混凝土局部受压问题提供了新的途径,进一步完善混凝土在局部受压领域的分析,具有一定的研究意义。本课题就混凝土抵抗局部受压的三种形式展开,即素混凝土试块,加入钢筋网片的混凝土试块,加入预应力筋的混凝土试块。利用ANSYS软件对试块添加轴心、偏心的局部压力,通过对比不同受力情况下的应力云图以及裂缝开展图,结合极限承载力数值得出不同形式的混凝土试块的受力特点与特性。最后将分析结果与理论计算的结果进行对比,得出混凝土在局部受压过程中的规律。最后对比不同形式试块的裂缝开展情况,得出最佳的混凝土抗局压体系。本文的研究成果使混凝土局部受压方面得到了补充和完善,并在前人的基础上提供了新的解决途径,对混凝土新规范的制定起到参考作用。
[Abstract]:Due to the increasing number of engineering accidents caused by insufficient bearing capacity of concrete structures under local compression load, the problem of local compression of concrete can not be ignored. In previous projects, the method of placing spiral stirrups or steel mesh to enhance the compressive strength of concrete partial compression is usually adopted to solve the problem of concrete partial compression, but the effect of local compression is not obvious, and a large amount of steel is wasted. With the development of prestressing technology, it provides a new way to solve the problem of local compression of concrete, and further improves the analysis of concrete in the field of local compression, which has certain research significance. In this paper, three forms of concrete resistance to local compression are developed, namely plain concrete test block, concrete specimen with reinforced mesh and prestressed concrete test block. The axial and eccentric local pressure is added to the specimen by ANSYS software. By comparing the stress cloud diagram and crack development diagram under different stress conditions, combined with the ultimate bearing capacity value, the stress characteristics and characteristics of different concrete test blocks are obtained. Finally, the law of concrete under local compression is obtained by comparing the analysis results with the results of theoretical calculation. Finally, by comparing the crack development of different test blocks, the best concrete local compression system is obtained. The research results of this paper make the concrete local compression to be supplemented and perfected, and provide a new way to solve the problem on the basis of the predecessors, and play a reference role in the formulation of the new concrete code.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37
本文编号：2391471
[Abstract]:Due to the increasing number of engineering accidents caused by insufficient bearing capacity of concrete structures under local compression load, the problem of local compression of concrete can not be ignored. In previous projects, the method of placing spiral stirrups or steel mesh to enhance the compressive strength of concrete partial compression is usually adopted to solve the problem of concrete partial compression, but the effect of local compression is not obvious, and a large amount of steel is wasted. With the development of prestressing technology, it provides a new way to solve the problem of local compression of concrete, and further improves the analysis of concrete in the field of local compression, which has certain research significance. In this paper, three forms of concrete resistance to local compression are developed, namely plain concrete test block, concrete specimen with reinforced mesh and prestressed concrete test block. The axial and eccentric local pressure is added to the specimen by ANSYS software. By comparing the stress cloud diagram and crack development diagram under different stress conditions, combined with the ultimate bearing capacity value, the stress characteristics and characteristics of different concrete test blocks are obtained. Finally, the law of concrete under local compression is obtained by comparing the analysis results with the results of theoretical calculation. Finally, by comparing the crack development of different test blocks, the best concrete local compression system is obtained. The research results of this paper make the concrete local compression to be supplemented and perfected, and provide a new way to solve the problem on the basis of the predecessors, and play a reference role in the formulation of the new concrete code.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37
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