摘要
基于标准步行荷载模型,使用人行桥多点加载的计算模型,对二、三、四跨人行桥在不同跨度比、主跨长度、人行桥基频、线密度、阻尼比和行人步频等参数情况下的动力反应进行大量的计算。通过参数分析,拟合得到单个行人通过人行桥时产生的均方根加速度反应谱包络线公式,并与数值计算结果、部分学者和规范的推荐估算结果进行比较,验证本文推荐公式的优越性。
Based on a standard vertical walking load model and an algorithm of calculating multi-point loads,a large number of numerical simulations are conducted for multi-span footbridges with different span ratios,spans,frequencies,line densities,damping ratios and step frequencies to obtain the RMS acceleration response spectrums.According to the results of parametric analysis,formulas are proposed to predict the RMS acceleration response of footbridges,and the accuracy is verified by comparing with both numerical simulation results and suggestions of other researchers.Furthermore,a simplified method is proposed to predict the response of multi-span footbridges with uncertain boundary conditions by using RMS acceleration response spectrums.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第9期117-124,共8页
China Civil Engineering Journal
基金
北京市自然科学基金(8052013)
长江学者和创新团队发展计划(IRT00736)
关键词
多跨人行桥
标准步行荷载
均方根加速度反应谱
动力反应
multi-span footbridge
standard model of vertical walking load
RMS acceleration response spectrum
dynamic behavior
