【作者】 张雪松；

【导师】 李忠献；

【作者基本信息】 天津大学 ， 结构工程， 2007， 博士

【摘要】 与钢筋混凝土结构相比,型钢混凝土结构具有承载力高、延性好的特点,因而在工程中得到了广泛的应用。然而,在强震作用下,梁端塑性铰易诱发梁柱连接焊缝发生脆性断裂,且渗透到节点核心区,从而大幅度地降低型钢混凝土结构的抗震性能。本文提出对梁端型钢翼缘采取狗骨式削弱,将塑性铰从梁端转移到削弱部位,从而提高型钢混凝土结构的抗震性能,因而具有重要的理论意义和工程价值。本文系统地开展了翼缘狗骨式削弱的型钢混凝土框架结构抗震性能的试验研究与理论分析,主要研究工作和创新成果包括以下三个方面:(1)翼缘狗骨式削弱的型钢混凝土框架梁柱节点抗震性能试验研究与理论分析。通过对7个足尺节点试件的低周反复荷载试验,研究了翼缘狗骨式削弱的型钢混凝土框架梁柱节点在水平地震作用下的承载能力、延性、耗能能力以及恢复力特性;验证了在型钢混凝土梁柱节点中采用翼缘狗骨式削弱和装配整体式构造的可靠性;分析了梁柱节点的破坏机理、损伤性能以及翼缘狗骨式削弱对节点受力性能的作用。结果表明:翼缘狗骨式削弱的型钢混凝土框架梁柱节点延性好,变形能力强,耗能能力高,因而具有良好的抗震性能。(2)翼缘狗骨式削弱的型钢混凝土框架结构抗震性能试验研究与理论分析。通过对一榀两跨三层1/3比例的翼缘狗骨式削弱的型钢混凝土框架结构模型的低周反复荷载试验,研究了框架结构在水平地震作用下的承载能力、延性、刚度退化、耗能能力、滞回特性、破坏机制以及翼缘狗骨式削弱对框架整体受力性能的作用;进一步研究了型钢混凝土框架结构的抗震能力设计方法。结果表明,翼缘狗骨式削弱的型钢混凝土框架结构延性好,变形能力强,耗能能力和承载能力高,满足一般延性框架的抗震性能要求。(3)翼缘狗骨式削弱的型钢混凝土框架抗震性能的非线性有限元分析。基于型钢混凝土的受力特点,建立了适用于反复荷载作用下型钢混凝土材料的本构关系。在上述试验研究的基础上,应用分离模量理论,考虑材料非线性、几何非线性和刚度退化等因素的影响,分析了在低周反复荷载作用下翼缘狗骨式削弱的型钢混凝土框架梁柱节点的受力性能和结构的滞回特性。分析结果与模型试验结果相比较,二者吻合较好,验证了基于分离模量理论的型钢混凝土结构设计方法的可行性和适用性。更多还原

【Abstract】 Compared with reinforced concrete (RC) structure, steel reinforced concrete (SRC) structure has characteristics of high bearing capacity and good ductility, so has been applied in engineering widely. However, under action of strong earthquake, plastic hinge at beam end may induce brittle fracture of welded joint between beam and column and entry joint core, which may reduce the seismic behavior of the SRC structure significantly. In this dissertation, dog-bone type reduced beam section is proposed for steel flanges at beam end so as to transfer the plastic hinge from the beam end to the reduced section. This may improve the seismic behavior of the SRC structure, and has important significance in theory and value in engineering.In this dissertation, the experimental investigation and theoretical analysis on seismic behavior of SRC frame structure with dog-bone type reduced beam section are systematically performed, and the main research work and innovation achievements are included in the three aspects as following.(1) Experimental study and theoretical analysis on seismic behavior of beam-column joint of SRC frame with dog-bone type reduced beam sections. Through test of 7 full-scaled beam-column joint specimens under cyclic loading, the bearing capacity, ductility, energy dissipation and hysteretic characteristics of the beam-column joints of SRC frame with dog-bone type reduced beam sections are studied. The reliability of the dog-bone type reduced beam sections and prefabricated integral constitution is verified. The failure mechanism and damage performance of the beam-column joint and the function of the dog-bone type reduced beam sections on the bearing capacity of the beam-column joint are investigated. The results show that the beam-column joint of SRC frame with dog-bone type reduced beam sections has good ductility, strong deformation ability and high energy dissipation, therefore has advanced seismic behavior.(2) Experimental investigation and theoretical analysis on seismic behavior of SRC frame structure with dog-bone type reduced beam sections. Through test of a two-span, three-storey one-third scaled SRC frame model under cyclic loading, the bearing capacity, ductility, stiff degeneration, ability of energy dissipation, hysteretic characteristics, failure mechanism of the frame structure and the function of dog-bone type reduced beam sections on integral bearing capacity of frame are studied. The design method for seismic capacity of SRC frame structure is further investigated. The results shows that the SRC frame structure with dog-bone type reduced beam sections has good ductility, strong deformation ability and high energy dissipation and bearing capacity, so as to meet the requirement for the seismic behavior of general ductile frame.(3) Nonlinear finite element analysis on seismic behavior of SRC frame structure with dog-bone type reduced beam sections. According to mechanical characteristics of SRC, a constitutive relationship applied for SRC material under cyclic loading is built. Based on the above experimental investigation, employing the separated modulus theory and considering the influence of nonlinearity of material and geometry and rigidity degeneration and so on, the bearing capacity of beam-column joint and hysteretic characteristics of structure of the SRC frame with dog-bone type reduced beam sections under cyclic loading are investigated. The calculated results are much coincided with the tested results. This proves that the design method for SRC structure based on the separated modulus theory is feasible and applicable.更多还原