Study on Seismic Strengthening of Steel Structure Framework withRemovable Knee Brace Reinforcement

通过对一个内柱节点的试件进行试验，验证了内柱节点的强度和刚度随内柱节点加强而提高的规律。虽然膝支撑对于加固和加强整体框架是有效的，但是由于膝支撑的高强度，假设现有的梁或柱在强烈地震期间仍然塑性化。如果在不假定梁或柱屈服的情况下可以提高抗震性能，则可以进行更好的改造。本研究提出一种新型的内建梳形阻尼器之膝支撑构件，并加以探讨。

An experiment was performed on a subassemblage specimen of an interior column joint with knee brace reinforcement, and the experimental results verified the increase in strength and stiffness of the beam-to-column joint due to the knee brace reinforcement. While knee braces are effective for stiffening and strengthening the overall frameworks, the existing beams or columns are assumed to still plastify during strong earthquakes because of the high strength of the knee braces. A better retrofit is possible if the seismic performance could be upgraded without assuming the yielding of beams or columns. A new type of knee brace member with a built-in comb-shaped damper is proposed and discussed in this study.