DIRECT DISPLACEMENT-BASED BRACE PARAMETERS DESIGN AND ANALYSES OF STEEL FRAME WITH SELF-CENTERING BRACES
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摘要: 该文提出了预压碟簧自复位耗能（PS-SCED）支撑-钢框架结构的等效阻尼比公式并验证其合理性，在此基础上，采用直接基于位移的抗震设计方法对一6层PS-SCED支撑-钢框架结构的支撑参数进行设计并分析。结果表明，不考虑等效阻尼比设计的支撑刚度偏于保守，支撑承载力需求偏大，而考虑等效阻尼比设计的支撑刚度和承载力需求更小且能使结构满足预定的性能目标；在相同性能目标下，支撑刚度比对结构的位移响应影响不大，按照所提出的刚度比区间设计的支撑参数能使结构满足变形限值要求。
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关键词:
- 直接基于位移的抗震设计 /
- 等效单自由度体系 /
- 自复位耗能支撑 /
- 等效阻尼比 /
- 支撑刚度比
Abstract: The equivalent damping ratio expression of steel frame with pre-pressed spring self-centering energy dissipation (PS-SCED) brace is proposed and validated in this paper. Then the direct displacement-based seismic design method is employed to determine the brace parameters of a 6-story PS-SCED braced frame. The results show that the designed brace stiffness is conservative and the brace bearing capacity demand is too large when the equivalent damping ratio is not considered. However, considering the equivalent damping ratio design makes the stiffness and bearing capacity demand of PS-SCED brace smaller and enables the braced frame to meet the specified performance level. Under the same performance level, the brace stiffness ratio has little effect on the structural displacement responses. Therefore, the designed brace parameters according to the proposed stiffness ratio interval are capable of making the PS-SCED braced frame meet the requirement of deformation limit. -
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