斜撐挫屈是特殊同心斜撐構架（SCBFs）中最先發生的破壞模式，為「弱斜撐－強接合板」邏輯，其中壓力斜撐所能吸收的能量主要來自斜撐挫屈後斜撐中央與兩端接合板所形成的彎曲塑性鉸，整體斜撐構架系統中的韌性主要由斜撐受拉降伏提供，然而受壓斜撐挫屈後勁度與強度急遽衰減，形成斜撐桿件於反復載重作用下拉力與壓力側性能不對稱現象，因此斜撐設置與方向需要考慮拉、壓均衡配置，接合板並需提供足夠轉動能力的細部以確保斜撐面外挫屈，且面外挫屈所產生的巨大面外變形也造成使用性的問題。
本研究採用「強斜撐－弱接合板」的設計概念，低降伏鋼具有低降伏強度、低降伏比、高延展能力。由先前研究及軸向試驗了解低降伏鋼接合板受壓後會產生挫屈，傳統側向加勁板可以防止接合板自由邊局部挫屈，其他模態挫屈仍會發生。獨立側向束制裝置之接合板，可在接合板發生側向變形後，束制其面外變形之功能，提高受壓強度，得到拉、壓對稱飽滿之遲滯迴圈。所以本研究接合板採用無任何加勁、傳統側向加勁及槽型束制裝置三組接合板試體，在同心斜撐構架中使用低降伏鋼接合板作為斜撐接頭，並以有限元素分析來驗證試驗結果，比較各組型式接合板在整體構架之強度、勁度、能量消散關係。

Special concentrically braced frames have been used widely in the seismic-resistant design of steel building structures. During earthquake excitation, the braces of the concentrically braced frame are subjected to recursive tensile and compressive forces, the brace buckle in the SCBF system is the first failure control mode which is the ‘Weak brace -Strong gusset’ concept .The ductility of the SCBF is provided by the inelastic deformation of the SCBF originates from the braces which are designed to yield in tension and to buckle globally or locally in axial compression, however the strength and the stiffness of the brace will be rapidly decay after buckling. In this report , an alternative design concept that adopts the ‘weak gusset-strong brace’ is examined. The gusset is designed to yield prior to the buckling of the brace. Low yield point (LYP) steel is selected for the gusset plate. The LYP steel possesses low yield strength and high elongation capacity. A series of analytical and experimental studies were carried out to examine the LYP steel gusset plates under monotonic and cyclic loads respectively. The LYP steel gusset plates exhibit better hysteresis characteristics than traditional gussets. Slot-type restrainer is a kind of independent lateral deformation restraining devices. The energy dissipation capacity of the gusset plate is also increased substantially. Based on this study, suggestions are made for the design of LYP gusset plates. By using the two stories one bay frame with diagonal brace to examine the seismic behavior between the gusset plates were designed using the lateral stiffeners and the slot-type restrainer.

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