Sophistication of seismic retrofit design of existing steel building structures

对两种既有钢结构延性抗震加固措施进行了试验研究：(1)提出了一种新的后置式延性膝部支撑构件，提供了一种剪切屈服装置。对膝关节支撑构件的力学性能进行了实验研究。提出了膝关节支撑构件的分析模型。(2)通过穷举短柱试验，对提高结构延性的有效加劲肋布置方式进行了试验研究。

Two typed of ductile seismic retrofitting measures of existing steel building structures are experimentally studied: (i) A post-installed ductile knee brace member, which furnishes a shear-yielding device, is newly proposed. The mechanical performance of the knee brace member is experimentally investigated. The analytical model of the knee brace member are also proposed. (ii) An efficient stiffener placement for improving ductility of structural members are experimentally studied by exhaustive stub column tests.