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Seismic mitigation of steel modular building structures through innovative inter-modular connections

机译：通过创新的模块间连接减轻钢制模块化建筑结构的地震

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Steel modular building structures are being increasingly adopted for a variety of building applications since their method of construction, despite being relatively new, offers many benefits over conventional constructional methods. Even though their behaviour under gravity (dead and live) loads is generally well understood, their response to lateral dynamic loads such as seismic and wind loads, is relatively less known. Due to their unique structural detailing, their structural response and failure patterns under lateral dynamic loading can vary considerably from that exhibited by conventional structures. Limited research has shown that under lateral loadings, modular structures tend to fail at the columns which are critical members whose failure can lead to partial or total collapse of the structure. This paper aims to mitigate this by shifting the failure away from the columns to inter-modular connections which can be allowed to deform in a ductile manner. Towards this end, this paper proposes two innovative inter-modular connections and investigates their performance under monotonic and cyclic lateral loading using comprehensive validated numerical techniques. The proposed connections have an additional steel plate and resilient layers to provide increased ductility and dissipation of seismic energy with desired ductile failure mechanisms. Three-dimensional numerical models of the proposed connections are developed in ABAQUS software considering geometric and material nonlinearities, as well as contact formulations to accurately capture their response to the lateral loads and failure propagations. The numerical model is verified based on experimental results in the literature and used for extensive parametric studies. Seismic reliance of the proposed connections in terms of ductility, failure patterns, and energy absorption are compared with those of a standard inter-modular connection currently used in modular buildings. The outcome of this study demonstrates that the proposed connections have superior dynamic performances compared to the standard inter-modular connections in use today. New information generated through this study will enable to improve life safety and dynamic performance of modular building structures under typical gravity loads as well as under seismic loading.
机译：钢制模块化建筑结构尽管越来越新，但与传统的建筑方法相比却具有许多优势，因为它们的建筑方法相对较新，因此越来越多地用于各种建筑应用中。尽管通常已经很好地了解了它们在重力（静载荷和动态载荷）下的行为，但相对于横向动态载荷（例如地震和风载荷）的响应却鲜为人知。由于它们独特的结构细节，它们在横向动态载荷下的结构响应和破坏模式可能与常规结构所表现出的变化很大。有限的研究表明，在侧向荷载作用下，模块化结构往往会在作为关键构件的立柱处失效，而这些失效会导致结构部分或全部塌陷。本文旨在通过将故障从柱子转移到模块间的连接处来减轻这种情况，这些连接可以允许以延性方式变形。为此，本文提出了两种创新的模块间连接，并使用经过全面验证的数值技术研究了它们在单调和周期性侧向荷载下的性能。所提出的连接具有附加的钢板和弹性层，以利用期望的延性破坏机制来提供增加的延性和地震能量的耗散。在考虑几何和材料非线性以及接触公式的情况下，在ABAQUS软件中开发了建议连接的三维数值模型，以精确捕获其对侧向载荷和破坏传播的响应。根据文献中的实验结果验证了该数值模型，并将其用于广泛的参数研究。将所提出的连接在延性，破坏模式和能量吸收方面的抗震性与目前在模块化建筑中使用的标准互模连接的抗震性进行了比较。这项研究的结果表明，与当今使用的标准模块间连接相比，所提出的连接具有出色的动态性能。通过这项研究产生的新信息将能够改善典型建筑在典型重力和地震荷载下的生命安全和动态性能。

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