Study On Hybrid Simulation Test Method Of High Strength Steel Composite Y-braced Frame

Hybrid simulation test method combines finite element numerical simulation with physical test.It divides the whole structure model into two parts.The first part of the structure which enters the plastic state is loaded as the test substructure.The remaining part which keeps the linear elastic state is analyzed by finite element software.The Open Fresco hybrid simulation test is used between the two parts.Data communication between them through Open Fresco hybrid simulation test coordination system.The seismic response of the whole structure can be obtained by integrating the results of two parts of test data.At present,hybrid simulation test method has become the main trend of modern structural seismic test method.In this paper,hybrid simulation test method is studied based on high strength steel composite Y-braced steel frame.Firstly,a hybrid simulation test system based on Open Fresco is established,and the working principles and functions of each component of the system are introduced.Secondly,a 1:2 scale single-span single-bay three-storey high strength steel composite Y-braced frame integral structure model is designed,and the upper third-storey space frame structure is selected as the experimental model.The numerical model of hybrid simulation test is established by Open Sees finite element software,and the accuracy of the numerical model is verified by the existing test results.Finally,the hybrid simulation test for high-strength steel composite Y-braced frame is carried out.The test results are compared with the existing shaking table test results and the numerical simulation results of the whole structure to verify the effectiveness of the hybrid simulation test method for high strength steel composite Y-braced frame structure.The results show that the hybrid simulation test method can ultimately obtain the seismic response of the whole structure by choosing the space frame as the test substructure to carry out physical test loading,and the other parts are analyzed and calculated by finite element numerical simulation.Through the hybrid simulation test of high strength steel Y-braced frame structure,the stiffness of the test substructure and strain response at measuring points、 displacement response of the whole structure、corner response of energy dissipation beam section 、 shear distribution law and hysteresis performance is obtained under different working conditions.And all performance indicators are in line with the concept of structural design,which show that the hybrid simulation test method is suitable for the research of high strength steel composite Y-braced frame structure.The hybrid simulation test results are compared with the existing shaking table test results and the total numerical simulation results The results of numerical simulation are compared and analyzed.The comparison results show that the hybrid simulation test is effective and reliable for the study of seismic performance of high strength steel composite Y-braced frame.