高強度鋼筋混凝土柱與鋼梁貫穿型接頭耐震行為

Abstract

以往RCS梁柱接頭之混凝土材料為常重混凝土，本次研究將使用高強度鋼筋混凝土材料，透過高強度材料之使用，可以縮減構材尺寸，以提高RC建築結構適用之最高樓層數。New RC柱的使用將可使所開發系統應用於高樓建築，鋼梁的使用將增大梁的跨度，特別適用於商辦建築之使用。 本研究主要探討高強度鋼筋混凝土柱與鋼梁貫穿型接頭之耐震行為，以4種RCS接頭模型設計試體，分析實驗結果，比較模型對於接頭剪力強度之準確度。為此設計八座大尺寸梁柱接頭試體，其中七座為十字型試體、一座為卜字型試體。試驗方法為於梁端施加反覆加載，柱之上下端固定住，以模擬韌性抗彎構架抵抗側向力之行為。不同以往RCS研究，考量實務上建物偶有偏心梁之設計，為確保NEW RCS之偏心梁設計亦可應用於實務上，設計之八座試體中，有四座為偏心試體，其中同側偏心與異側偏心各兩座，觀察其耐震行為並提出建議之接頭細部設計細節，包含偏心接頭之補強與接頭箍筋減量設計。

Conventionally, the concrete material of RCS is ordinary concrete, hence, in order to reduce the size of the structure and further increase the maximum number of floors applicable to the RC building structure, this research focuses on the use of high-strength reinforced concrete. The use of the proposed New RC columns enables to be applied to high-rise buildings, while of steel beams increase the span of beams which are especially suitable for commercial and office buildings. This study aims to evaluate the seismic behavior of through-beam joints of high-strength reinforced concrete columns and steel beams. Via experimental study, four types of RCS models are applied to design specimens to which the accuracy of the models with respect to the strength of joint shear can be compared. Totally eight large-scale beam-columns joint specimens are designed, while seven of them are interior joints, and one of them is exterior joints. The testing methodology is to apply duplicated loading on the beam end, and simulate the behavior of the moment-resisting frame against lateral force by fixing the upper and lower ends of the columns. Additionally, different from the previous RCS research, considering the design of buildings with occasional eccentric beams, in order to ensure that the design of eccentric beams of the NEW RCS can also be applied in practice, four of the eight designed specimens are eccentric specimens, of which two of them are same-side eccentric and the other two are different-side eccentirc. At the same time, proposing the detailed design of joints, including the reinforcement of eccentric joints and the design of joint stirrup reduction, by observing the seismic behavior of eccentric beams.