圆中空夹层钢管混凝土柱半刚性节点的抗震试验与理论分析研究

发布时间：2019-01-14 14:15

【摘要】：与圆钢管混凝土柱节点相比,目前关于圆中空夹层钢管混凝土柱节点的试验和理论研究尚少见。1994年美国北岭和1995年日本神户地震后,为了改进刚性焊接节点的抗震性能差、现场焊接质量难以保证等缺点,部分学者提出了单边螺栓端板连接节点。该节点具有现场可装配式施工、抗震延性强等显著优点。本文通过试验验证和有限元数值分析,研究了圆中空夹层钢管混凝土柱半刚性节点的抗震性能和破坏机理,研究工作总结如下:(1)利用有限元计算程序ABAQUS开展了圆钢管混凝土柱半刚性节点的理论研究,通过试验验证了理论分析模型的可靠性和准确性。分析了在12个参数影响下此类节点的弯矩-转角关系曲线的变化规律和静力性能等。本文解决了在有限元建模过程中存在的极其复杂的圆弧曲面接触问题,为第四章的理论研究奠定基础。(2)进行了4个圆中空夹层钢管混凝土半刚性端板连接节点的抗震性能试验,以端板形式(平齐和外伸)和柱截面空心率(χ=0.61、0.73)为主要研究参数。分析了此类节点的破坏形态、荷载-位移曲线、弯矩-转角滞回曲线、刚度、强度退化、耗能和应力应变等。(3)利用有限元计算程序ABAQUS在圆钢管混凝土柱半刚性节点的研究工作基础上,开展了圆中空夹层钢管混凝土柱半刚性节点的理论研究。对典型试件进行了非线性全过程分析,详述了节点常见破坏形式:端板破坏、螺栓破坏、柱破坏等。(4)利用有限元计算程序ABAQUS,分析了在钢梁屈服强度(fy,b)、钢管屈服强度(fy,c)、混凝土强度(fcu)等13个参数影响参数下圆中空夹层钢管混凝土柱半刚性节点力学性能的影响规律。(5)根据试验和有限元计算结果,对圆中空夹层钢管混凝土柱半刚性节点提出了一些合理的构造措施,如:节点核心区内焊钢隔板、节点核心区钢管外焊C-型钢板、外伸端板设加劲肋、梁翼缘水平加腋和梁翼缘弧形削弱等。这些措施能不同程度地提高节点的刚度和抗弯承载力,随着建筑工业化的发展,有望将这种节点推广到实际工程中去。
[Abstract]:Compared with the concrete-filled circular steel tubular joints, the experimental and theoretical studies on the circular hollow sandwich concrete-filled steel tubular column joints are rare. In order to improve the seismic performance of rigid welded joints, after the Kobe earthquake in 1994 and 1995, the seismic behavior of rigid welded joints is poor. It is difficult to guarantee the welding quality in the field, so some scholars put forward the single side bolt end-plate connection joint. The node has the advantages of field assembly construction, strong seismic ductility and so on. In this paper, the seismic behavior and failure mechanism of semi-rigid joints of circular hollow sandwich concrete-filled steel tubular columns are studied by means of experimental verification and finite element numerical analysis. The research work is summarized as follows: (1) the theoretical study of semi-rigid joints of concrete-filled circular steel tubular columns is carried out by using the finite element program ABAQUS. The reliability and accuracy of the theoretical analysis model are verified by experiments. Under the influence of 12 parameters, the variation law and static performance of the moment-angle curve of this kind of joints are analyzed. In this paper, the extremely complicated contact problem of arc surface in finite element modeling is solved. It lays a foundation for the theoretical research in chapter 4. (2) the seismic behavior tests of four circular hollow sandwich steel tube concrete filled steel tube (CFST) semi-rigid end-plate connections are carried out. The main parameters of the study are the end-plate form (horizontal and extension) and the hollow ratio of column section (蠂 = 0.61 ~ 0.73). The failure patterns, load-displacement curves, moment-rotation hysteretic curves, stiffness and strength degradation of such joints are analyzed. (3) based on the research of semi-rigid joints of concrete-filled circular steel tubular columns, the theoretical study of semi-rigid joints of concrete-filled circular tubular columns is carried out by using the finite element program ABAQUS. The nonlinear full-process analysis of typical specimens is carried out, and the common failure forms of joints are described in detail, such as end-plate failure, bolt failure, column failure, etc. (4) the yield strength (fy,b) of steel beams is analyzed by using the finite element program ABAQUS,. Under the influence of 13 parameters, such as yield strength (fy,c) and concrete strength (fcu), on the mechanical properties of semi-rigid joints of circular hollow sandwich concrete-filled steel tubular columns, (5) according to the experimental and finite element calculation results, Some reasonable construction measures are put forward for the semi-rigid joints of circular hollow sandwich CFST columns, such as welding steel partition in the core zone of the joints, welding C-shaped steel plates outside the steel tubes in the core areas of the joints, stiffening ribs at the outstretched end plates, etc. Beam flange horizontal plus axil and beam flange arc weakening etc. These measures can improve the stiffness and flexural capacity of joints in varying degrees. With the development of building industrialization, it is expected that this kind of joints will be extended to practical projects.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11

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