Dynamic Loads Produced by Occupants of Public Assembly Structures

拟议研究的目的是定义由人员就地移动所产生的动态荷载。这项工作将侧重于与公共集会占有率相关的运动的连贯性(即群体效应)。调查将通过三项面向目标的任务进行：a)通过在空间和时间上外推个人产生的荷载，对群体效应进行分析性建模；b)对原型楼板系统的群体效应进行实验测量；以及c)使用为产生结构荷载标准而开发的分析模型。在以前的一项拨款下开始的工作，其中研究了个人产生的周期性、瞬时和随机的动态载荷，将被延长。来自现有部队平台的数据将用于有限人口，在时间和频率两个领域对群体负荷进行数学建模。将产生载荷幅度和频率的近似设计包络，并为第三项任务确定测试样本大小。组荷载模型将通过由轻质构件构建的全尺寸楼板系统进行验证。将使用改进的道路测量平台来制定设计指南。预期的结果和建议的设计模型将需要用于结构的静态或动态分析的荷载-频谱。由于这一问题的性质，将特别注意发展与研究人员以及直接参与设计实践的研究人员不断交流信息和思想的沟通渠道。还将特别注意在地方、国家和国际各级尽可能广泛地传播该方案的最终成果。

The purpose of the proposed research is to define the dynamic loads generated by in-situ occupant movements. The work will focus on the coherence of motion (i.e., the group effect) associated with public assembly occupancies. The investigation will be conducted through three goal-oriented tasks devoted to: a) analytically modeling the group effect by spatially and temporally extrapolating loads produced by individuals; b) experimentally measuring the group effect on a prototypical floor system; and c) using the analytical models developed to produce structural load criteria. The work begun under a former grant wherein periodic, transient, and random dynamic loads produced by individuals were studied will be extended. Data from an existing force platform will be utilized for a limited population to mathematically model group loads in both the time and frequency domains. Approximate design envelopes for both load amplitude and frequency will be produced and test sample sizes will be determined for the third task. The group load models will be verified with a full-scale floor system constructed from lightweight components. Design guidelines will be formulated using an improved road-measuring platform. Anticipated results and suggested design models will entail load-versus-frequency spectra for either static or dynamic analyses of structures. Because of the nature of the problem, special attention will be given to developing channels of communication for the continual exchange of information and ideas with researchers, as well as those directly involved in design practice. Special attention will also be given to the widest possible dissemination of the end results of the program on the local, national and international levels.