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System identification of civil engineering structures with multiple inputs by decoupling output signals

机译:通过解耦输出信号对具有多个输入的土木工程结构进行系统识别

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System identification of civil engineering structures are often formulated as Multiple-Input, Multiple-Output (MIMO) problems due to the complexity of loading conditions such as differential ground motion, which is also multi-directional in nature. Such MIMO system identification problems are challenging due to strong coupling between the contributions of multiple ground motion inputs to each individual response. Compared with Single-Input, Multiple-Output (SIMO) system identification, MIMO problems are often more computationally complex and error prone. In this paper, a new system identification strategy is proposed in which a more complex MIMO problem is converted into a number of SIMO problems by decoupling the contribution of multiple inputs to the outputs. A QR-factorization based approach is adopted for the decoupling and its accuracy is investigated. The effectiveness of the proposed strategy is demonstrated through applications to a two-span straight bridge and a four-span curved bridge, both are highway bridges.
机译:由于诸如差分地面运动之类的载荷条件的复杂性,土木工程结构的系统识别通常被表述为多输入多输出(MIMO)问题,这在本质上也是多方向的。由于多个地面运动输入对每个单独响应的贡献之间的强耦合,因此此类MIMO系统识别问题具有挑战性。与单输入多输出(SIMO)系统识别相比,MIMO问题通常在计算上更加复杂且容易出错。在本文中,提出了一种新的系统识别策略,其中通过将多个输入对输出的贡献去耦,将更复杂的MIMO问题转换为许多SIMO问题。采用基于QR分解的方法进行解耦,并研究了其准确性。通过应用于两跨均为公路桥梁的两跨直桥和四跨弯桥,证明了所提出策略的有效性。

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