均匀受力的混凝土深梁抗剪机理研究

发布时间：2018-04-19 02:28

本文选题：深梁 + 抗剪　；参考：《河北联合大学》2014年硕士论文

【摘要】：采用钢筋混凝土结构的构件在使用过程中需要避免产生脆性破坏，可是构件最容易发生的脆性破坏是剪切破坏。为防构件发生剪切破坏，必须对构件受剪破坏的原因和机理进行研究，以采取必要的措施防止构件发生类似破坏。很长时间以来，国内外的学者对混凝土构件的抗剪做了很多的研究工作，但是，由于影响构件剪切性能的因素比较多，所以研究起来比较复杂，并且研究试验主要以集中荷载为主，对于深梁在均布荷载作用下的有限元分析比较少。每个国家规范中的剪切计算公式比较多的是以较少的试验数据为基础的，为了验证规范中的计算公式是否一样适用于更多的结构构件中，，就需要对试验数据库中关于剪切的内容进行丰富，并通过试验数据对规范中的计算数据进行检验。对现浇的钢筋混凝土简支深梁的抗剪性能进行了理论分析计算，通过我国规范的理论计算和有限元软件分析，对梁在均布荷载作用下分别从混凝土强度、箍筋配筋率、梁的有效截面高度和纵筋配筋等方面对其本身的剪切强度进行了分析，评价了各个影响因素对梁抗剪强度的影响。并将依据规范计算出理论结果与有限元分析的结果进行对比分析。结果表明，钢筋混凝土深梁随着混凝土强度的增强，梁的抗剪能力增强；随着梁的有效截面高度的增高，梁的抗剪能力不断增强；随着纵筋配筋率的增大，梁的抗剪性能略有增强；随着箍筋配箍率的增大，梁的抗剪能力在不断增强。
[Abstract]:In the process of using reinforced concrete structure, brittle failure should be avoided, but shear failure is the most likely brittle failure.In order to prevent the shear failure of the members, it is necessary to study the cause and mechanism of the shear failure, so as to take necessary measures to prevent the similar damage.For a long time, scholars at home and abroad have done a lot of research on shear resistance of concrete members. However, because there are many factors affecting the shear behavior of concrete members, the research is quite complex.The experimental results are mainly concentrated loads, but the finite element analysis of deep beams under uniform load is less.The shearing formulas in each national code are more based on less test data, in order to verify that the formulas in the code are equally applicable to more structural components,It is necessary to enrich the contents of shear in the test database and test the calculation data in the specification through the test data.The shear behavior of cast-in-place reinforced concrete simply supported deep beams is theoretically analyzed and calculated. Through theoretical calculation and finite element software analysis of the code in our country, the concrete strength and stirrups reinforcement ratio of beams under uniform load are analyzed respectively.The shear strength of the beam is analyzed from the aspects of the effective section height and the reinforcement of the longitudinal reinforcement, and the influence of various factors on the shear strength of the beam is evaluated.The theoretical results calculated according to the specifications are compared with the results of finite element analysis.The results show that the shear resistance of the reinforced concrete deep beam increases with the increase of concrete strength, the shear resistance of the beam increases with the increase of the effective section height of the beam, the shear resistance of the beam increases with the reinforcement ratio of the longitudinal reinforcement.The shear resistance of the beam is slightly enhanced, and the shear capacity of the beam increases with the increase of hoop ratio of stirrups.
【学位授予单位】：河北联合大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1

【参考文献】