地下结构“可修”状态的层间位移角限值研究

我国地下结构抗震一般采用两阶段设计,抗震设防目标一般为"中震不坏、大震可修",高于地上结构.规范中"大震可修"的性能指标以层间位移角表示,但层间位移角限值的确定依据并不明确.以地下结构"可修"状态的这一抗震性能指标为研究对象,首先对比国内外常用抗震设计规范中"可修"状态的层间位移角限值,分析不同规范性能指标存在差异的原因;然后,通过统计国内外框架结构和剪力墙结构拟静力试验的结果,评估我国抗震规范"可修"状态层间位移角限值的合理性;最后,以地铁车站和地上框架结构为例,通过推覆分析对比研究地下与地上结构的损伤破坏规律,比较地下结构"可修"层间位移角限值与地上结构的差异.研究结果可为地下结构抗震设计规范的修订提供参考.

Research on Design of Sponge Urban Scheme Based on LID Measures

With the continuous acceleration of current economic development in China, the coverage of urbanization has developed to an unprecedented scale, and the regional hardening area has also increased. Subsequently, the size of the urban permeable area is gradually compressed so that it is prone to disasters such as urban waterlogging in the rainy season, which brings many problems to urban development and residents'' lives. In order to reduce the severity of urban waterlogging, weaken the single flood peak, and reduce the various hazards caused by it, taking an urban green park in Shenzhen as a design example, SWMM software is used to build a runoff rainwater model for this urban green park. Four kinds of LID measures are set to simulate the schemes, and compared with a comprehensive LID measure scheme to analyze the influence rule of each scheme on the overall rainwater runoff and the single rainwater runoff peak of this urban green park. The simulation results show that the overall rainwater runoff reduction effect of the comprehensive LID measure scheme is the best, and the effect of green roof LID measure scheme is the worst. The effect of rainwater bucket LID measure scheme is worse than the permeable pavement LID measure scheme, and the effect of permeable pavement LID measure scheme is worse than the biological detention tank LID measure scheme. In terms of reducing the peak volume of single rainwater runoff, the effect of comprehensive LID measure scheme is also the best, and the effect of rainwater bucket LID measure scheme is the worst. The effect of green roof LID measure scheme is worse than the permeable pavement LID measure scheme, and the effect of the permeable pavement LID measure scheme is worse than the biological detention tank LID measure scheme.