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,对单跨简支和固支人行桥在不同跨度、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。探讨使用均方根加速度反应谱包络线公式求解边界条件不明确时人行桥动力反应的简化计算方法。
Based on a standard pedestrian walking load model and an algorithm for calculation of multi-point loads,a large number of numerical simulations are conducted for single-span footbridges of different span lengths,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 single-span footbridges,and the accuracy is verified by comparing with both numerical simulation results and suggestions from other researchers.Furthermore,a simplified method is proposed to predict the response of single-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109-116,130,共9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
人行桥
标准步行荷载模型
均方根加速度反应谱
边界条件
footbridge
standard pedestrian walking load model
RMS acceleration response spectrum
boundary condition
