摘要
为研究盖板加强型节点钢框架结构的抗震性能,通过3榀1∶3缩尺盖板加强型节点钢框架子结构的低周往复加载试验,分析了此类子结构的滞回性能、刚度、延性、等效黏滞阻尼比,以及此类钢框架子结构侧向倒塌时的层间位移角、层间累积延性及累积耗能系数。研究表明:薄壁钢梁钢框架子结构试件的钢梁端部先屈曲后屈服,对应的层间最大位移角均值为3.5%,层间累积塑性位移角为45.5%,层间累积位移角延性比为43.3,层间累积塑性耗能系数为33.05;厚壁钢梁钢框架子结构试件在钢梁端部进入塑性后,其梁柱连接区域的焊缝断裂,对应的层间最大位移角均值为6.2%,层间累积塑性位移角为85.6%,层间累积位移角延性比为61.2,层间累积塑性耗能系数为72.66;厚壁钢梁钢框架子结构试件的钢梁端部形成理想塑性铰,对应的层间最大位移角可达7.2%,层间累积位移角为162.9%,层间累积位移角延性比为139.3,层间累积塑性耗能系数为117.58。
In order to investigate the seismic behavior of steel frame with cover-plate reinforced( CPR) connections,a total of three steel frame substructures with CPR connections at 1 ∶ 3 scale ratio were tested under low reversed cyclic loading. The hysteretic loops,lateral stiffness,ductility,equivalent damping ratio of specimens were analyzed,and the inter-story drift,cumulative ductility,cumulative hysteretic energy ratio of this type of steel frame substructure at collapse limit state were emphatically discussed. The results show that the specimen with thin-walled sectional beam produces the buckling prior to the yielding at the ends of the steel beam,and the maximum inter-story drift ratio,the cumulative inter-story drift ratio,the cumulative ductility,as well as the cumulative hysteretic energy ratio are 3. 5%,45. 5%,43. 3,and 33. 05,respectively. The specimen with thick-walled sectional beam also has fracture at the weld region,and the maximum inter-story drift ratio,the cumulative inter-story drift ratio,the cumulative ductility,as well as the cumulative hysteretic energy ratio are 6. 2%,85. 6%,61. 2,and 72. 66,respectively. In addition,the specimen with thick-walled sectional beam also produced the desired hinges at the ends of the steel beam,and the maximum inter-story drift ratio, the cumulative inter-story drift ratio, the cumulative ductility, as well as the cumulative hysteretic energy ratio are 7. 2%,162. 9%,139. 3,and 117. 58,respectively.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第6期19-28,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51178285)
关键词
钢框架
子结构
盖板加强型节点
拟静力试验
抗震性能
steel frame
substructure
cover-plate reinforced connection
quasi-static test
seismic behavior
