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Experimental testing and numerical modelling of a heavy timber moment-resisting frame with ductile steel links

机译：延性钢连杆的重型抗弯框架的试验测试与数值模拟

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This paper presents the development, experimental testing, and numerical modelling of a new hybrid timber-steel moment-resisting connection that is designed to improve the seismic performance of mid-rise heavy timber moment-resisting frames (MRF). The connection detail incorporates specially designed replaceable steel links fastened to timber beams and columns using self-tapping screws. Performance of the connection is verified through experimental testing of four 2/3 scale beam-column connections. All 4 connection specimens met the acceptance criteria specified in the AISC 341-10 provisions for steel moment frames and exhibit high strength, ductility, and energy dissipation capacity up to storey drifts exceeding 4%. All of the timber members and self-tapping screw connections achieved their design objective, remaining entirely elastic throughout all tests and avoiding brittle modes of failure. To assess the global seismic performance of the newly developed connection in a mid-rise building, a hybrid timber-steel building using the proposed moment-resisting connection is designed and modelled in OpenSees. To compare the seismic performance of the hybrid MRF with a conventional steel MRF, a prototype steel-only building is also designed and modelled in OpenSees. The building models are subject to a suite of ground motions at design basis earthquake and maximum credible earthquake hazard levels using non-linear time history analysis. Analytical results show that drifts and accelerations of the hybrid building are similar to a conventional steel building while the foundation forces are significantly reduced for the hybrid structure because of its lower seismic weight. The results of the experimental program and numerical analysis demonstrate the seismic performance of the proposed connection and the ability of the hybrid building to achieve comparable seismic performance to a conventional steel MRF.
机译：本文介绍了一种新型混合木-钢抗弯连接的开发，实验测试和数值模型，该连接旨在改善中高层重型木抗弯框架（MRF）的抗震性能。连接细节包括专门设计的可更换钢链节，这些钢链节使用自攻螺钉固定在木梁和木柱上。通过对4个2/3比例的梁柱连接进行实验测试，可以验证连接的性能。所有4个连接样品均符合AISC 341-10中关于钢制框架的规定的验收标准，并显示出高强度，延展性和能量耗散能力，直至层间漂移超过4％。所有的木材构件和自攻螺钉连接均达到了其设计目标，在所有测试中均保持完全弹性，并避免了脆性破坏模式。为了评估中层建筑中新开发的连接的整体抗震性能，在OpenSees中设计并建模了使用拟议的抗弯连接的木木混合建筑。为了将混合MRF与传统钢MRF的抗震性能进行比较，还在OpenSees中设计并建模了仅钢结构的原型。使用非线性时程分析，在设计基准地震和最大可信地震危害级别下，建筑模型会经受一系列的地震动。分析结果表明，混合建筑的漂移和加速度与常规钢结构建筑相似，而混合结构由于其较低的地震重量而大大降低了地基力。实验程序和数值分析的结果证明了所提出的连接的抗震性能以及混合建筑获得与常规钢MRF相当的抗震性能的能力。

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