钢梁与SRC柱之梁柱接头耐震试验

Experimental Study on Seismic Behavior of Steel Beam to SRC Column Connections

相对于传统SRC梁接SRC柱的梁柱接头而言,本研究采用钢梁接SRC柱之接头型式,尝试利用SRC柱在劲度与抗压强度之优点,并避开SRC梁在施工上的不便,初步进行了两组大尺寸试体之反复载重试验,以探讨此种型式接头之耐震行为。实验结果显示,由于两组试体之钢梁与钢柱之弯矩强度比并未满足强柱弱梁的规定(但SRC柱整体之抗弯强度仍大于钢梁之强度),因此其反复载重位移曲线并不如满足强柱弱梁的纯钢构接头饱满,而在非弹性阶段出现较明显劲度衰减的现象;但由于SRC柱接头区的混凝土对钢柱提供了良好的围束,使得试体极限强度仍可稳定发展。

The objective of this research is to investigate the seismic behavior of steel beam to SRC (Steel Reinforced Concrete) column connections. Two large-scale specimens were fabricated and tested under cyclic loading. The advantages of this new type of beam-to-column construction include the effective use of the stiffness and compressive strength of SRC column and the reduction of construction complexity of SRC beam.The major parameters investigated in this study include the type of connection, the panel zone strength, the hoop reinforcement requirement, and the steel moment ratio of the beam-to-column connection. It was observed that the ratio of the moment resisting capacity of the steel shape in SRC column to that of the steel beam plays an important role in the seismic resisting performance of this type of connection. It is expected that the seismic behavior of the SRC beam-to-column connections can be studied in depth through the tests of large-scale specimens. In addition, a new set of design standard is to be established based on the results of this research.