考虑现浇楼板影响的RCS组合框架结构抗震设计方法研究

发布时间：2018-03-04 13:01

本文选题：RCS组合框架　切入点：现浇楼板　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：钢筋混凝土柱-型钢梁(RCS)组合框架结构是由钢筋混凝土柱和型钢梁组合而成,这种结构体系充分利用了混凝土柱和钢梁各自构件的优点。目前,对该体系的研究主要集中在梁柱节点方面,而对RCS组合框架结构整体抗震性能的研究很少。本文主要研究现浇楼板对RCS组合框架屈服机制的影响规律,并对比分析RCS组合框架和其它类型框架的抗震性能。针对RCS组合框架结构,分别建立有楼板和无楼板结构的有限元模型,通过非线性静力分析,对两种结构在不同地震水准下的抗震性能进行评估。重点研究现浇组合楼板对RCS组合框架结构破坏过程和屈服机制的影响。算例计算结果表明,现浇楼板可增大型钢梁的刚度和抗弯承载力,使RCS框架结构的破坏形态呈现“柱铰机制”,且延性降低很多。通过有限元的进一步建模,分别研究现浇楼板的跨度和厚度对RCS组合框架梁刚度的影响规律。结果表明,RCS组合框架中梁刚度放大系数在钢梁与板厚的比值较大或较小时,均会超出规范的规定范围。此外,通过线性回归分析,建立了型钢梁中梁刚度放大系数与型钢梁高度和混凝土楼板厚度的关系式。对具有不同开洞楼板的RCS组合框架结构进行有限元建模和分析,探讨现浇楼板对RCS组合框架梁受弯承载力的影响,并基于拉应力等效原则,对考虑楼板贡献的框架梁有效翼缘宽度的合理取值进行了研究。结果表明,型钢梁两侧6倍板厚范围内的现浇楼板可作为有效翼缘宽度的计算范围。此外,还考虑翼缘板范围内钢筋对梁端抗弯承载力的贡献,提出了梁端实际抗弯承载力的计算公式。分别采用四种结构体系(钢框架、钢筋混凝土框架、RCS组合框架、钢管混凝土组合框架)对同一建筑进行结构设计,使其均满足三阶段两水准的抗震要求。并对比分析四种框架结构的抗震性能。结果表明,在实现同样使用功能的前提下,RCS组合框架结构的抗震性能介于钢筋混凝土框架和钢框架之间。
[Abstract]:The reinforced concrete column-steel beam composite frame structure is composed of reinforced concrete column and steel beam. This kind of structure system makes full use of the advantages of concrete column and steel beam. The research on this system is mainly focused on Liang Zhu joints, but little on the overall seismic behavior of RCS composite frame structure. In this paper, the effect of cast-in-place floor on yield mechanism of RCS composite frame is studied. The seismic behavior of RCS composite frames and other types of frames are compared and analyzed. For RCS composite frame structures, the finite element models with and without floor structures are established, and the nonlinear static analysis is carried out. The seismic behavior of two kinds of structures under different earthquake levels is evaluated. The effect of cast-in-place composite floor on the failure process and yield mechanism of RCS composite frame structure is mainly studied. Cast-in-place floor slab can increase the stiffness and flexural capacity of large steel beams, and make the failure form of RCS frame structure appear "column hinge mechanism", and its ductility is much lower. The effects of the span and thickness of cast-in-place slab on the stiffness of RCS composite frame beam are studied respectively. The results show that the stiffness magnification factor of beam in RCS composite frame is larger or smaller than that of steel beam and slab thickness. By linear regression analysis, the relationship between the stiffness magnification factor of steel beam and the height of steel beam and the thickness of concrete slab is established. The finite element model and analysis of RCS composite frame structure with different openings are carried out. The effect of cast-in-place floor slab on flexural bearing capacity of RCS composite frame beam is discussed. Based on the principle of equivalent tensile stress, the reasonable selection of effective flange width of frame beam considering floor contribution is studied. The cast-in-place slab can be used as the calculation range of the effective flange width in the range of 6 times the thickness of the slab on both sides of the steel beam. In addition, the contribution of the reinforcement to the flexural bearing capacity of the beam end is considered in the range of the flange slab. The formulas for calculating the actual flexural bearing capacity of the beam end are put forward. Four structural systems (steel frame, reinforced concrete frame / RCS composite frame, steel tube concrete composite frame) are used to design the same building respectively. The seismic performance of four frame structures is compared and analyzed. The results show that, The seismic behavior of RCS composite frame structure is between reinforced concrete frame and steel frame.
【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】：2015
【分类号】：TU398.9;TU352.11

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