钢筋混凝土板柱节点冲切破坏试验研究

发布时间：2018-09-13 14:28

【摘要】：随着社会进步,人们开始对室内空间提出更高的要求,一些传统结构形式已经无法满足人们需要。钢筋混凝土板柱结构的出现,给人们提供更为广阔的室内空间,但同时由于其传力路径及受力特点不同于传统结构形式,研究其破坏形态十分必要。大量学者对影响板柱节点抗冲切承载力的诸多参数进行研究,但目前对于其中较为重要的配筋率和混凝土强度参数仍然存在很大分歧,特别是随着高强混凝土的广泛应用,许多设计方法已经不能够很好的反应出这些参数对板柱节点抗冲切承载力的影响。因此,许多学者曾提出各种类型的强度理论计算模型,比如,刚塑性模型、基于双向板转角的临界斜裂缝理论、基于截面应变的抗剪强度模型及基于圆锥壳模型的计算方法等等。由于各种模型基于不同假设,给出不同计算方法,分析计算过程较为繁琐复杂,国际上一直没有比较统一的理论分析方法,因此许多国家的设计规范采用的是半经验性的公式,其计算结果有一定的离散性,也缺乏有力的理论依据。本文进行了5块钢筋混凝土板柱节点冲切破坏试验,观察试验板破坏现象、板受拉区裂缝状态、荷载-挠度曲线、荷载-应变曲线及板斜裂缝开展情况,同时引用同系列试验的4块试验板的试验结果比较不同混凝土强度(C30、C50、C70)、纵向钢筋配筋率(0.86%、1.28%、1.73%)试件破坏模式的差异,特别是高强混凝土板破坏特点及受冲切性能。本文采用简化的刚塑性理论、基于转角的临界斜裂缝理论的计算方法、基于截面应变的抗剪强度理论和基于圆锥壳理论的Carl Erik Broms计算方法分别对本系列试验5块试验板和引用的4块试验板的抗冲切承载力进行计算,并与试验实测值比较;又采用T.Ying、易伟建和H.M.Elsanadedy提出的统计公式对这9块试验板进行计算对比;同时采用ACI318-11规范、EC2-2004规范以、fib Model Code2010规范和GB50010-2010规范对这9块试验板抗冲切承载力进行计算分析;最后计算与本试验板尺寸、配筋及混凝土强度相近的52块试验板,比较各种计算方法的不同及计算结果的准确度和离散程度。
[Abstract]:With the progress of society, people begin to put forward higher demands on indoor space, and some traditional structures can not meet the needs of people. The appearance of reinforced concrete slab-column structure provides people with more extensive indoor space, but at the same time, due to its transmission path and stress characteristics different from the traditional structural form, it is very necessary to study the failure form of reinforced concrete slab-column structure. A large number of scholars have studied many parameters that affect the punching shear capacity of slab-column joints, but there are still great differences on the more important reinforcement ratio and concrete strength parameters, especially with the wide application of high-strength concrete. Many design methods can not well reflect the impact of these parameters on the punching shear capacity of plate-column joints. Therefore, many scholars have put forward various kinds of strength theory calculation models, such as rigid-plastic model, critical oblique crack theory based on bidirectional plate rotation angle. The shear strength model based on cross-section strain and the calculation method based on conical shell model etc. Because various models give different calculation methods based on different hypotheses, the process of analysis and calculation is complicated and there is no unified theoretical analysis method in the world, so many design codes in many countries adopt semi-empirical formulas. The results are discretization and lack of theoretical basis. In this paper, the impact shear failure tests of five reinforced concrete slab-column joints are carried out, and the failure phenomenon of the test plate, the crack state in the tensile zone, the load-deflection curve, the load-strain curve and the development of the slanting crack of the plate are observed. At the same time, the test results of four test plates of the same series are used to compare the failure modes of different concrete strength (C _ (30) C _ (50) C _ (70) and longitudinal reinforcement ratio (0.86 ~ 1.28 ~ 1.73%), especially the failure characteristics and impact shear behavior of high strength concrete slabs. In this paper, a simplified rigid-plastic theory is used to calculate the critical oblique fracture theory based on the angle of rotation. The shear strength theory based on cross section strain and Carl Erik Broms calculation method based on conical shell theory are used to calculate the punching shear capacity of 5 test plates and 4 quoted test plates respectively, and the results are compared with the measured values. The statistical formula proposed by T. Ying, Yi Wei and H.M.Elsanadedy was also used to calculate and compare the nine test plates, and the ACI318-11 code (EC2-2004) was used to calculate and analyze the punching shear capacity of the 9 test plates with the codes of Model Code2010 and GB50010-2010. Finally, 52 test plates with similar size, reinforcement and concrete strength are calculated and compared with the different calculation methods, accuracy and dispersion of the results.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375

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