鋼骨斜撐構架系統之接合板壓力強度參數研究與設計方法

Abstract

鋼骨消能斜撐因受軸壓時不會產生挫屈，故在受壓及受拉時有相近的力學行為，在近年來已被廣泛研究，但是在國內外的實驗中均有發現接合板在消能斜撐達其極限強度前即發生挫屈。因此本研究將著重在研究鋼骨消能斜撐系統之接合板受軸壓力下之力學行為，以有限元素分析程式ABAQUS分析含挫屈束制鋼骨消能斜撐之一層樓構架之強度及行為，並針對其加勁板進行有限元素分析之參數研究，藉由改變其加勁板的尺寸與後度來探討對接合板強度之影響。本研究結果顯示：(1) 含挫屈束制消能斜撐之接合板在受軸壓作用下，將產生的挫屈模式為Fixed-Free、(2)接合板在Fixed-Free模式下之挫屈強度預測及(3)如何加勁接合板使其強度能達到降伏後之非彈性挫屈行為。

Buckling-restrained brace (BRB) was widely used and studied because of high levels of energy dissipation in seismic loading. Gusset plates, which connect the BRB to other structural members, experienced unexpected buckling before reaching the ultimate capacity of the BRB. The research, therefore, aimed to investigate buckling strength and inelastic compressive behavior of the gusset plate with various geometry, edge stiffeners, and boundary conditions. A parametric study was performed by the general purpose nonlinear finite element computer program ABAQUS. The research results showed that (1) inelastic compressive behavior of the gusset plate was similar to a cantilever plate in compression load, (2) buckling strength was reasonably predicted based on an inelastic plate buckling equation and buckling coefficient, and (3) design guidelines of the gusset plate in compression were proposed with inclusions of edge stiffeners.