摘要
人行荷载受到步频、步长、行人自重、各阶谐分量动载系数和相位等参数随机性影响而具有显著的随机性,导致其荷载反应谱的随机性。给出了考虑到上述随机因素的反应谱,并且引入以均匀试验为基础的反应谱的计算方法解决计算工作量的问题。按照均匀试验构造代表性人行荷载时程的随机样本,在各个跨度、阻尼比的梁式结构上进行时程分析,获得反应谱曲线。在此基础上运用响应面和可靠度分析得到具有指定保证率的峰值加速度谱,并进行了频率、阻尼比和跨度等因素的敏感性分析,给出了最大加速度谱的一般计算式。
Owing to the random parameters which affect pedestrian loads such as walking step frequency,step length,dynamic load factors and phases of harmonic components,pedestrian loads are random,which induce random response spectrum.A new method for calculating random response spectrum based on uniform design is introduced to induce calculation work.A few representative samples of random loads time history are simulated using uniform design,and then response spectrum curves are obtained by dynamic time-history analysis on beam structures with various spans and damping ratios.The maximum acceleration response spectrums which have a certain probability are obtained by response surface and reliability analysis;ultimately the general forms of maximum acceleration response spectrum are deduced from the analyses of the sensitivities of damping ratio and span.
出处
《科学技术与工程》
2010年第29期7171-7175,共5页
Science Technology and Engineering
关键词
人行激励
均方根响应
均匀试验
pedestrian excitation RMS response uniform design
