竖向压应力状态下钢筋与砖砌体粘结性能的试验研究

发布时间：2018-11-14 19:51

【摘要】：砌体结构是一种历史悠久的结构形式,历次震害表明,无筋砌体结构震害严重,为了提高其抗震性能,在砌体中配置一定量的钢筋形成配筋砌体成为我国在地震区采用砌体结构的必然选择。配筋砌体能提高其抗震性能的关键是钢筋与砌体之间的粘结力。砌体结构中钢筋的粘结强度不仅与砂浆强度有关,还与砌体所受的竖向压应力相关。因此,本文以配筋砖砌体为研究对象,通过试验及理论分析,旨在探究配筋砌体受竖向压应状态下配筋的粘结性能。主要研究内容与结论如下:本文根据实际配筋砌体中水平钢筋的受力特点,自制试验装置,模拟了结构构件在施工及使用过程中,不断受到自重及上部荷载的压缩作用。制作了20组试件,考虑了竖向压应力与粘结锚固长度等因素,通过拉拔试验,获得了试件样本的破坏形式和粘结滑移曲线规律,通过对粘结滑移曲线特征及影响参数的分析,提出了考虑竖向压应力影响的配筋砖砌体粘结滑移本构模型,建立了粘结滑移数学表达式,给出了含竖向压应力与粘结锚固长度两个变量的粘结滑移特征参数方程,并对结果进行了对比分析,结论表明,预测结果与试验结果吻合良好。通过对配筋外贴应变片,得到了配筋砖砌体在长粘结锚固下配筋沿长度方向应变分布规律,采用应变求解粘结应力的矩阵方程法,获得了配筋沿长度方向的应力分布并给出了能反应粘结应力分布的解析函数。
[Abstract]:Masonry structure is a kind of structure form with a long history. The previous earthquake damage shows that the seismic damage of unreinforced masonry structure is serious, in order to improve its seismic performance, Reinforcement masonry with a certain amount of reinforcement in masonry has become the inevitable choice of masonry structure in earthquake area in China. The key to improve the seismic performance of reinforced masonry is the bond between reinforcement and masonry. The bond strength of reinforcing bar in masonry structure is not only related to mortar strength, but also to the vertical compressive stress of masonry. Therefore, this paper takes reinforced brick masonry as the research object, through experimental and theoretical analysis, the purpose of this paper is to explore the bond behavior of reinforced masonry under vertical compression. The main research contents and conclusions are as follows: according to the stress characteristics of horizontal steel bars in practical reinforced masonry, this paper simulates the compression action of structural members subjected to self-weight and upper load during construction and use. Twenty groups of specimens were made. The vertical compressive stress and the length of bond anchoring were taken into account. Through drawing test, the failure form and the law of bond-slip curve were obtained, and the characteristics of bond-slip curve and the influence parameters were analyzed. The bond-slip constitutive model of reinforced brick masonry considering the effect of vertical compressive stress is proposed. The mathematical expression of bond-slip is established, and the characteristic parameter equation of bond-slip with two variables of vertical compressive stress and bond anchoring length is given. The results are compared and analyzed. The conclusion shows that the predicted results are in good agreement with the experimental results. The strain distribution of reinforced brick masonry along the length direction under long bond Anchorage is obtained by attaching strain gauges to the outside of reinforcement. The matrix equation method of strain solution to bond stress is adopted. The stress distribution along the length of the reinforcement is obtained and the analytical function of the stress distribution can reflect the bond stress distribution is given.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU364

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