Improving behavior of semi-supported steel plate shear walls

Abstract

In spite of the good performance of the steel plate shear wall (SPSW) in recent earthquakes and experimental studies, the need for huge columns to surround the infill plate is a major shortcoming of the system. This shortcoming can be resolved by using semi-supported SPSW. The semi-supported SPSW has secondary columns that prevent the transfer of stress from the infill plate to the main columns. In spite of extensive experimental and numerical investigations on SPSWs, there are many ambiguities regarding the behavior of the semi-supported SPSW. Although stress in the columns is reduced, incomplete diagonal tension field action is formed in the infill plate that creates new problems. In this paper, a new type of semi-supported SPSW is presented in which the steel plate and the secondary columns are angled. The creation of the angle of the plate and the secondary column makes it possible to use the full capacity of the steel plate as well as the capacity of the secondary columns. Numerical results showed that the wall with a 60° angle has a favorable performance relative to the semi-supported wall. Moreover, with the 60° angle, stiffness, strength and energy absorption is increased. The angle of the secondary columns has little effect on the non-elastic stiffness. Nevertheless, using a wall with an angle of more than 90° can neutralize the wall’s behavior relative to conventional walls. Therefore, the wall with a 60° angle as an optimal angle is recommended.

摘要

最近的地震和实验研究表明钢板剪力墙(SPSW)的性能良好,但该系统的一个主要缺点是需要巨 大的柱子来包围填充板,而利用半支撑SPSW 可以解决这一不足。半支撑SPSW 有二级柱,可防止应 力从填充板转移到主柱。尽管对SPSW 进行了大量的实验和数值研究,但关于半支撑SPSW 的行为仍 存在许多争议。虽然柱内的应力减小了,但填充板内形成了不完全的对角张力场作用,从而产生了新 的问题。本文提出了一种新型的半支撑式钢结构,钢板和次柱之间形成一个夹角,使钢板的全部承载 力和次柱的承载力得以利用。数值模拟结果表明,与半支撑墙体相比,60°角的墙体具有良好的性能。 此外,当夹角为60°时,刚度、强度和能量吸收都有所增加。二次柱的角度对非弹性刚度影响不大。 然而,若使用角度大于90°的墙将抵消相对于传统墙的优势。因此,推荐60°为墙体的最佳角度。