带钢接头的装配式钢筋混凝土梁抗剪性能研究
发布时间：2019-01-27 17:56
【摘要】：近年来，随着建筑行业工业化的发展，预制构件越来多地应用于工程中。在高层建筑中，常采用预制钢筋混凝土梁与钢柱或钢管混凝土柱连接，但梁柱连接节点构造复杂、施工难度大。因此，本课题组基于专利《一种预制钢-混凝土组合梁》（ZL201010213908.02），，对专利中介绍的钢节点进行了改进，提出了两种带钢接头的装配式钢筋混凝土梁，并对这两种新型梁进行了抗弯性能的试验研究和有限元分析。研究结果表明，两种新型梁呈现出明显的三阶段工作状态，具有良好的抗弯性能，开裂弯矩和极限弯矩与规范计算结果吻合良好，可沿用现行混凝土结构设计规范对其进行抗弯承载力设计。 由于钢筋混凝土梁斜截面受剪性能的影响因素众多，迄今为止尚缺乏一个完善的理论体系。对于本课题组前期提出的两种带钢接头的装配式钢筋混凝土梁，钢接头的位置正处于构件的剪跨区，因此这两种新型梁在弯剪共同作用下，钢接头会对其抗剪承载力及剪切破坏模式产生一定影响。为此本文对这两种新型梁的抗剪性能进行了试验研究及有限元模拟，并验证及对比了中国、美国与欧洲规范对其进行抗剪承载力设计的适用性，具体包括以下三部分内容： （1）带钢接头的装配式钢筋混凝土梁抗剪性能试验研究 本文设计了剪跨比为1.5和2.5的两组共6个试件，每组试件包括两个带钢接头的装配式钢筋混凝土梁及1个普通钢筋混凝土梁对比试件。试验过程中测量了千斤顶反力，跨中、加载点及支座位移，钢板、钢筋及试件剪跨区混凝土应变，裂缝宽度及发展趋势和钢接头上下翼缘界面钢与混凝土间的滑移等，记录了试件的破坏过程及最终破坏模式。 （2）带钢接头的装配式钢筋混凝土梁有限元分析 采用有限元分析软件ABAQUS对6个试件进行抗剪性能的分析，得到荷载-位移曲线，钢筋、钢板及混凝土的应变及裂缝发展过程等，与试验结果进行对比，验证模型的正确性。 （3）中国、美国及欧洲规范的抗剪承载力设计方法对比 将材料实测强度平均值带入各国规范的抗剪承载力公式，对比各国规范计算结果与试验值，验证各国规范对两种新型梁抗剪承载力设计的适应性，并对比各国规范抗剪承载力设计的保证率。
[Abstract]:In recent years, with the development of construction industry industrialization, prefabricated components are more and more used in engineering. In high-rise buildings, precast reinforced concrete beams are often used to connect with steel columns or concrete filled steel tubular columns, but Liang Zhu connection joints are complicated in structure and difficult in construction. Therefore, based on the patent < A prefabricated steel-concrete composite beam (ZL201010213908.02), the paper improves the steel joint introduced in patent, and puts forward two kinds of fabricated reinforced concrete beams with strip joints. Experimental study and finite element analysis on the bending behavior of these two new beams are carried out. The results show that the two new types of beams have obvious three-stage working state and have good bending performance. The results of cracking moment and ultimate moment agree well with the calculated results of the code. The flexural bearing capacity design of concrete structure can be carried out according to the current design code of concrete structure. There are many factors that influence the shear behavior of reinforced concrete beams with oblique sections, so far there is still a lack of a perfect theoretical system. For the fabricated reinforced concrete beams with two kinds of strip joints proposed by our research group, the position of the steel joints is in the shear span of the members, so these two new types of beams are under the joint action of bending and shear. The shear strength and shear failure mode of steel joint will be affected to some extent. In this paper, the shear behavior of these two new types of beams is tested and simulated by finite element method, and the applicability of Chinese, American and European codes for the design of shear bearing capacity is verified and compared. The main contents are as follows: (1) the experimental study on shear behavior of fabricated reinforced concrete beams with steel joints. In this paper, two groups of six specimens with shear span ratio of 1.5 and 2.5 are designed. Each set of specimens consists of two fabricated reinforced concrete beams with steel joints and one normal reinforced concrete beam as a contrast specimen. During the test, the reaction force of the Jack, the displacement of the middle span, the loading point and support, the strain of steel plate, steel bar and specimen shear, the width of crack and the developing trend of crack and the slip between steel and concrete at the upper and lower flange interface of steel joint were measured. The failure process and ultimate failure mode of the specimen were recorded. (2) finite element analysis of prefabricated reinforced concrete beams with steel strip joints. The shear behavior of six specimens was analyzed by finite element analysis software ABAQUS, and the load-displacement curve and steel bar were obtained. The strain and crack development of steel plate and concrete are compared with the test results to verify the correctness of the model. (3) the design methods of shear bearing capacity of Chinese, American and European codes are compared. The average value of measured strength of materials is introduced into the formulas of shear bearing capacity of national codes, and the calculation results and test values of national codes are compared. The adaptability of national codes to the design of shear bearing capacity of two new types of beams is verified, and the guarantee rate of the design of shear bearing capacity of different countries is compared.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1
本文编号：2416538
[Abstract]:In recent years, with the development of construction industry industrialization, prefabricated components are more and more used in engineering. In high-rise buildings, precast reinforced concrete beams are often used to connect with steel columns or concrete filled steel tubular columns, but Liang Zhu connection joints are complicated in structure and difficult in construction. Therefore, based on the patent < A prefabricated steel-concrete composite beam (ZL201010213908.02), the paper improves the steel joint introduced in patent, and puts forward two kinds of fabricated reinforced concrete beams with strip joints. Experimental study and finite element analysis on the bending behavior of these two new beams are carried out. The results show that the two new types of beams have obvious three-stage working state and have good bending performance. The results of cracking moment and ultimate moment agree well with the calculated results of the code. The flexural bearing capacity design of concrete structure can be carried out according to the current design code of concrete structure. There are many factors that influence the shear behavior of reinforced concrete beams with oblique sections, so far there is still a lack of a perfect theoretical system. For the fabricated reinforced concrete beams with two kinds of strip joints proposed by our research group, the position of the steel joints is in the shear span of the members, so these two new types of beams are under the joint action of bending and shear. The shear strength and shear failure mode of steel joint will be affected to some extent. In this paper, the shear behavior of these two new types of beams is tested and simulated by finite element method, and the applicability of Chinese, American and European codes for the design of shear bearing capacity is verified and compared. The main contents are as follows: (1) the experimental study on shear behavior of fabricated reinforced concrete beams with steel joints. In this paper, two groups of six specimens with shear span ratio of 1.5 and 2.5 are designed. Each set of specimens consists of two fabricated reinforced concrete beams with steel joints and one normal reinforced concrete beam as a contrast specimen. During the test, the reaction force of the Jack, the displacement of the middle span, the loading point and support, the strain of steel plate, steel bar and specimen shear, the width of crack and the developing trend of crack and the slip between steel and concrete at the upper and lower flange interface of steel joint were measured. The failure process and ultimate failure mode of the specimen were recorded. (2) finite element analysis of prefabricated reinforced concrete beams with steel strip joints. The shear behavior of six specimens was analyzed by finite element analysis software ABAQUS, and the load-displacement curve and steel bar were obtained. The strain and crack development of steel plate and concrete are compared with the test results to verify the correctness of the model. (3) the design methods of shear bearing capacity of Chinese, American and European codes are compared. The average value of measured strength of materials is introduced into the formulas of shear bearing capacity of national codes, and the calculation results and test values of national codes are compared. The adaptability of national codes to the design of shear bearing capacity of two new types of beams is verified, and the guarantee rate of the design of shear bearing capacity of different countries is compared.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1
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