| Steel moment-resisting frames, which were considered having excellent performance for seismic resistance, were widely used in multi-stories or high-rise structures. Especially after the unexpected numerous brittle connection failures happened in the 1994 Northridge earthquake and 1995 Kobe earthquake, many scholars have been attaching great importance to the observed connection problems in project circle, which is one of the hot research subjects in recent years. Though scholars have studied on seismic-resistant behavior of Steel moment-resisting frames, mostly study on joint of steel frames. This paper draws lessons from the research approaches of some scholars on the basis of existing research results and use nonlinear FEM. Based on the verifications of the existing test results by the computation results from the nonlinear finite element program considering geometry, material nonlinearity, an thorough finite element simulation of the Steel moment-resisting frames is carried out. The behavior and fracture mechanism of Steel moment-resisting frames under cyclic load are analyzed,then a new breakage mode of Steel moment-resisting frames based on the computation results, which can provide basis for engineering design. During the parametric analysis, length of beam , height of beam, height of column, press of column are considered to study their impact on the seismic-resistant behavior of Steel moment-resisting frames, then draw some conclusions: Strength of welding nearby end of beam will decide on seismic-resistant behavior in steel moment Frames; With pressure of column increasing, pressure of column will decide on the seismic-resistant behavior of Steel moment-resisting frames; With height of beam increasing, rigidity and carrying capacity of steel frames will increase ,while the Seismic-resistant behavior will be decreased; With length of beam increasing, rigidity and carrying capacity of steel frames will decrease and seismic-resistant behavior will increase, but it is not obvious; With height of column increasing, rigidity and carrying capacity of steel frames will decrease and the seismic-resistant behavior will improve, but it is not obvious. In conclusion, the finite-element model can well simulate the behavior of Steel moment-resisting frames under cyclic load. The study is rather systematic. The conclusion and design recommendations are very useful for instructing the project. This article plays a basis role of more study about seismic-resistant behavior of Steel moment-resisting frames. |
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