An Alternative Architectural Configuration to Increase the Seismic Resistance of Buildings

为了通过调谐质量阻尼器显著增加结构的阻尼，必须使用质量较大的阻尼器。避免使用额外质量的一种可能方法是使用建筑物屋顶作为阻尼器的质量。为此，人们必须将屋顶与建筑物的其他部分隔离，将其连接到弹簧和阻尼器上，然后将它们连接到建筑物的其他部分。然而，更方便的是，人们可以利用在基础隔离技术方面取得的进展，使用弹性轴承代替弹簧。本文提出的研究目的是对实际建筑进行数值研究，并对两个小型五层钢结构建筑模型进行实验研究，以证明这种配置是一种可行的方式来构建阻尼器，增加建筑物的阻尼，并增加其对地震激励的抵抗力。将进行数值研究，以调查在实际建筑物中达到预期效果所需的轴承尺寸，其轴承所经历的位移的数量级，建筑物-阻尼系统在结构应力超过其弹性极限时的行为，以及使用这种技术实施实际建筑物的设计难点。实验研究将在振动台上对两种建筑模型进行测试。其中一个模型将按照常规配置构建，另一个模型将按照拟议的配置构建。这项研究将有助于验证数值研究的结果，而不考虑建筑物及其弹性轴承的分析模型所涉及的假设和不确定性。这些研究的结果有望在数字和实验上证明所提出的技术的可行性和有效性，将澄清其使用所提出的一些问题，并且，如果证明有效，将为大规模实验计划的规划提供激励、理由和所需的信息。* * *

9503200 Villaverde To augment the damping of a structure significantly through a tuned-mass damper one has to use a damper with a large mass. A possible way to avoid the use of an additional mass is to use the building roof as the damper's mass. For this, one has to isolate the roof from the rest of the building, connect it to a spring and a dashpot, and then connect these to the rest of the building. More conveniently, however, one can take advantage of the progress made in base isolation technology and use elastomeric bearings instead of springs. The purpose of the proposed research is to conduct a numerical study with an actual building and an experimental study with two small-scale five-story steel building models to demonstrate that such a configuration is a viable way to construct a damper, to augment the damping in a building, and to increase its resistance to earthquake excitations. The numerical study will be carried out to investigate the bearing dimensions needed to attain the desired effect in a real building, the order of magnitude of the displacements experienced by its bearings, the behavior of the building-damper system when the structure is stressed beyond its elastic limit, and the design difficulties in implementing a real building with such a technique. The experimental study will be performed by testing on a shaking table the two building models. One of the models will be built with a conventional configuration and the other according to the proposed one. This study will serve to verify the findings from the numerical one without the assumptions and uncertainties involved in the analytical modelling of the building and its elastomeric bearings. The results of the studies are expected to demonstrate numerically and experimentally the viability and effectiveness of the proposed technique, will clarify some of the questions posed by its use, and, if proven effective, will furnish incentives, the justification, and the needed information for the planning of a large-scale experimental program. ***