隨著時代的演變，土木結構工程技術的開發與進步，對於損傷或者設計不良之結構物，已有許多的補強與加勁的方式，鑒於一般房屋為框架型的結構型式，可進一步於框架內緣加置補強用斜撐，進行結構物強度的補強，以使受損建築物修復後能符合相關耐震規範要求。 考量鋼材料在降伏後之塑性延展行為，結構補強用之斜撐系統以鋼結構型式，採用方鋼管為斜撐主體型式，並在兩側進行切割以達韌性變形之目的；考慮切割後可能的損壞模式，適當於兩側之切割區加設角鋼圍束與內撐之方鋼管，如此鋼斜撐的消能能力可更為提升。 利用Ansys有限元素分析軟體來模擬鋼斜撐彈塑性行為，採用位移控制加載方式來分析各3D鋼斜撐模型，結果中可發現鋼斜撐在經過圍束設計後，大大提昇斜撐原本不足的抗壓強度，且經圍束作用後斜撐之遲滯迴圈也比未圍束時的飽滿，消能效果明顯改善，因此圍束設計的確可以改善斜撐經切割後不足的勁度與消能能力。 With the development of the times, the development and progress of civil engineering have had a lot of ways repair and with strength of benefit already for the damaging or the bad designing structure. Seeing that general structure building of frame type, can use bracing to add in frame to repair the strength of structure, so that the damaged building can accord with the code and able to bear shaking after being repaired. Consider the plasticity extension behavior after steel material yielding, bracing system use as steel construction, the principle part of bracing system adopt the rectangular steel tube, and cut it on both sides in order to the purpose to reach toughness out of shape; The possible damaged way, add and set up the angle steel to confine and steel tube to brace inner after considering cutting, such steel bracing energy disappear ability can raise. Using Ansys finite element program to analyze steel bracing’s elastic-plasticity behavior, adopt displacement to control the way of loading to analyse that every 3D steel bracing models. In the results, it have improve the originally insufficient bracing’s compression strength greatly after to use the confined design, and the force-displacement cycles more wide, energy dissipating also improved obviously, the confined design can improve steel bracing’s stiffness and energy dissipating after cutting bracing.