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Practical study on structural performance index considering human performance limit in buildings

考虑建筑人体性能极限的结构性能指标实用研究

基本信息

批准号：
17360264
负责人：
OTANI Shunsuke
金额：
$ 9.91万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

We have paid attention with indoor human response and evacuation action in the strong ground motion. The evacuation action does not mean refuge from the building, but means hiding under the table or turning off the kitchen stove, for example. The reason why we paid attention with the evacuation action was that the safety of human inside the buildings was more important than the safety of the buildings itself. The concept might lead us to the situation that the structural performance could represent with the ease of evacuation action. We developed wire-driven long stroke shaking table, because long period ground motion is more important to consider with off shore huge earthquakes. This table is driven by wire connected with dynamic actuator and its displacement is increased by 6 sets of tackles and 13 times of actuator's deformation, theoretically. It could be said that high frequency floor response causes strong anxiety for indoor people. Low frequency floor response cause stagger for indoor people proportional with velocity in the range of 1.0 s to 3.3 s. For longer period than 3.3 s, it seems proportional with acceleration. After the analysis with motion capture system, the authors got unsteadiness indices and one of them (index using the record of 1.6 s) has very strong correlation with action difficulty. After the analytical study on structural system with connected vibration control and base isolation system, we got the preferable floor response for performance-based design.

强地震动作用下室内人员的反应和疏散行为一直受到人们的关注。疏散行动并不意味着从建筑物中避难，而是意味着躲在桌子下面或关闭厨房的炉子。我们之所以关注疏散行动，是因为建筑物内人员的安全比建筑物本身的安全更重要。这个概念可能会导致我们的情况下，结构性能可以代表与疏散行动的便利。由于长周期地面运动在海岸大地震中的重要性，我们研制了绳索驱动长冲程振动台。该平台采用钢丝绳与动力作动器连接驱动，理论上可增加6组滑车的位移，增加作动器变形量的13倍。可以说，高频地板响应对室内人群造成了强烈的焦虑。在1.0 ~ 3.3s的范围内，低频地板响应引起室内人员的晃动，与速度成正比。对于大于3.3 s的时间段，它似乎与加速度成正比。经过动作捕捉系统分析，得到了不稳定指标，其中一个指标（使用1.6s记录的指标）与动作难度有很强的相关性。通过对隔震与振动控制相结合的结构体系的分析研究，得到了基于性能的设计所需要的较好的楼层反应。