钢板栓筋连接高强箍筋约束混凝土柱的抗震性能研究

发布时间：2018-10-31 10:23

【摘要】：社会的发展对房屋建筑结构的设计和建造提出了环保、节能、抗震等要求，采用装配整体式框架结构取代现浇式框架结构，可以很好地适应和满足这种要求。高强螺旋箍筋能够产生很好的约束作用，有效改善混凝土的脆性，提高延性，因而有利于改善结构的抗震性能。本文将其应用于装配整体式框架结构，提出了一种新型装配式柱－钢板栓筋连接高强箍筋约束混凝土柱。连接节点构造为：先将预埋钢板焊在上、下柱的纵向钢筋，然后用外贴钢板盖在上、下柱的预埋钢板上；预埋钢板与外贴钢板都在指定位置穿孔，，用水平栓筋穿过钢板与混凝土柱预留孔，末端与外贴钢板焊接，将上、下两段柱连接成整体柱。通过试验研究、数值模拟和连接节点承载力分析，对钢板栓筋连接高强箍筋约束混凝土柱的抗震性能进行了研究。进行了2个钢板栓筋连接高强箍筋约束混凝土柱、2个对比整浇普通筋箍柱及2个整浇高强箍筋约束混凝土柱的低周反复水平加载试验。观测和记录了6个试件受力－变形－损伤－裂缝－屈服的全过程；分析了各试件的破坏特征、滞回曲线、骨架曲线、刚度衰减、位移延性、耗能能力等。试验表明：在相同条件下，钢板栓筋连接高强箍筋约束混凝土柱具有与整浇柱相当的承载能力、耗能能力和延性，抗震性能良好；连接节点未先于构件破坏，表明采用焊接及水平栓筋的钢板栓筋连接方式能满足强节点的要求，是安全可靠的。在试验的基础上，分析了连接节点的受力性能；进一步推导出连接节点正截面和斜截面承载力计算公式；研究了连接节点处钢板、焊缝、水平栓筋的强度验算方法，为这种新型连接节点的设计方法提供试验数据和理论基础。结合试验，采用ABAQUS软件建立了钢板栓筋连接高强箍筋约束混凝土装配柱的三维实体有限元模型，分析构件在往复水平荷载作用下的受力过程、变形大小及应力－应变分布；对这种装配式柱的抗震性能及工程应用进行了综合评价。
[Abstract]:The development of society has put forward the requirements of environmental protection, energy saving and earthquake resistance to the design and construction of building structure. The use of assembly integral frame structure to replace the cast-in-place frame structure can well adapt to and meet this requirement. The high strength spiral stirrups can effectively improve the brittleness and ductility of concrete and thus improve the seismic performance of the structure. In this paper, a new type of reinforced concrete column with high strength stirrups is proposed for assembling integral frame structure. The connection joint is constructed as follows: first, the embedded steel plate is welded on the top, the longitudinal steel bar of the lower column is first welded, then the overlay steel plate is covered with the outer steel plate, and the embedded steel plate of the lower column is placed on the steel plate; The embedded steel plate and the external steel plate are perforated in the specified position. The horizontal bolt bar is used to pass through the reserved hole of the steel plate and concrete column, the end is welded with the external steel plate, and the upper and the next sections of the column are connected to the whole column. The seismic behavior of high strength stirrups confined concrete columns with steel plate corrugated bars is studied by means of experimental study, numerical simulation and bearing capacity analysis of connection joints. In this paper, two concrete columns with high strength stirrups, two concrete columns with normal reinforcement and two concrete columns with high strength stirrups are tested under low cycle and horizontal loading. The whole process of stress deformation-damage crack and yield of 6 specimens was observed and recorded and the failure characteristics hysteretic curves skeleton curves stiffness attenuation displacement ductility and energy dissipation capacity of each specimen were analyzed. The test results show that under the same conditions, the confined concrete columns with high strength stirrups connected with steel plate bolted bars have the same bearing capacity, energy dissipation, ductility and good seismic performance as the cast-in-place columns. The connection joint is not destroyed before the component, which indicates that the steel plate bolted joint with welding and horizontal corrugated bars can meet the requirements of the strong joint and is safe and reliable. On the basis of the test, the bearing capacity of the connection joint is analyzed, and the bearing capacity formula of the normal section and the inclined section of the connection joint is derived. In this paper, the strength checking method of steel plate, weld seam and horizontal bolted bar is studied, which provides the experimental data and theoretical basis for the design of the new connection joint. Combined with the test, the three-dimensional solid finite element model of the steel plate bolt-bar connection high-strength stirrups confined concrete assembly column is established by using ABAQUS software. The stress process, deformation and stress-strain distribution of the members under reciprocating horizontal load are analyzed. The seismic performance and engineering application of this prefabricated column are comprehensively evaluated.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398;TU352.11

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