论文部分内容阅读
提出了一种应用于联肢剪力墙体系的新型钢连梁,称之为双阶屈服消能钢连梁。该新型钢连梁包含两部分;发生剪切屈服的核心板梁和发生弯曲屈服的外套箱形梁。在小震作用下,剪切屈服板梁进入塑性,发挥消能减震作用,弯曲屈服梁保持弹性从而保证结构的整体刚度。在中震及大震作用下,剪切屈服梁和弯曲屈服梁同时进入塑性,发挥更大的消能作用,使主体结构免遭过大的地震损伤。双阶屈服钢连梁联肢墙体系作为一种高性能减震结构体系,与传统的混凝土连梁联肢墙体系相比,其刚度和承载力贡献都有较大的提高,并且双阶连梁的附加阻尼比贡献率在小震、中震和大震下可以分别达到28%、44%和72%。联肢墙的耦联比体现了连梁对墙肢约束作用,不同耦联比的联肢墙结构的连梁剪力沿层高分布形式不同。针对3种不同耦联比的联肢墙分析了双阶屈服钢连梁的参数设计方法和建议的布置形式,并在这些建议布置模式下,对比了普通钢连梁结构和双阶连梁结构在小震下的附加阻尼比,大震下各连梁的延性系数等指标,体现了双阶屈服钢连梁对结构的消能贡献和损伤控制。
A new type of steel beam, which is applied to the joint-shear wall system, is proposed. It is called a double-stage yielding steel beam. The new steel coupling beam consists of two parts; a core slab subjected to shear yielding and a boxed beam subjected to yielding. Under the action of minor earthquakes, the shear yielding beam will enter the plasticity and play the role of energy dissipation and cushioning, and the curved yielding beam will maintain the elasticity so as to ensure the overall stiffness of the structure. Under the action of moderate earthquakes and large earthquakes, the shear yielding beam and the curved yielding beam enter into plasticity at the same time, exerting greater energy dissipating effect and protecting the main structure from excessive earthquake damage. As a kind of high-performance shock-absorbing structural system, double-tie yielding beam-coupled limb-wall system has a greater increase in the contribution of stiffness and bearing capacity compared with the traditional concrete beam-linked limb-wall system, The contribution ratio of additional damping ratio of beams can reach 28%, 44% and 72% under small earthquake, moderate earthquake and large earthquake respectively. The coupling ratio of the joint wall reflects the restraining effect of the connecting beam on the wall and the different distribution of the shear strength of the connecting beam along the layer with different coupling ratios. In this paper, the design method and the proposed layout of two-step yielding steel beams are analyzed for the three different types of coupling ratio. In these proposed arrangements, the comparison of the common beam structure and double-beam structure The additional damping ratio under minor earthquakes and the ductility coefficient of each connecting beam under major earthquakes reflect the contribution of energy dissipation and damage control of double-tiered yield beam to the structure.