Sacrificial-Energy Dissipation Supports Seismic Performance Analysis Of Steel Frame Brace Structure

In recent years,steel frame-support structures have been widely used in high-rise buildings,and how to improve the seismic performance of steel frame-support structures has become an important research front.Based on the engineering background of 15-story steel frame-bracing in the 8-degree seismic fortification area,through numerical simulation and theoretical analysis,the seismic performance and design method of ordinary bracing steel frame,buckling-resisting bracing(BRB)steel frame and sacrificial energy-consuming steel frame are studied.Research was carried out.The main research work includes:(1)Use Truss Element,Hysteretic Material and Steel02 Material in OpenSees to model the sacrificial-energy dissipating support and the anti-buckling support.The simulated hysteresis curve and unit volume strain energy are in good agreement with the test results,and can better reflect the mechanical properties of the two supports under the horizontal pushover.(2)The modeling script based on Python’s secondary development of OpenSees can quickly and accurately model the frame support structure in OpenSees.By comparing the static analysis results and dynamic analysis results of the YJK model and the OpenSees model,the Python modeling is verified.correctness of the script.The script makes the visualization of the preprocessing module low during OpenSees modeling,and the problem of unsystematic modeling of large structures or overall structures has been solved.It can improve the visualization degree of the model during modeling,which is convenient for checking and modifying the model,and can be well connected with the subsequent data analysis and data visualization work.(3)Through the finite element study,the optimal sacrificial section in the 15-story steel frame support structure of the example in this paper is determined: the ratio of energy dissipation section is 6:4.Under this ratio,the energy consumption ratio of the frame column and the actual delay The regenerative energy consumption is the lowest,the energy consumption ratio of the frame beam and the actual hysteretic energy consumption are the lowest,the support energy consumption ratio and the actual hysteretic energy consumption reach the peak value,and the number of plastic hinges and yielding elements at the column end of the frame is the least.Moreover,the distribution of energy consumption of the sacrificial-energy-dissipating support steel frame supports is more in line with the requirements of the "Energy Anti-Seismic Design Method".The sacrificial-energy-dissipating support in each layer can guide more energy into the substructure,and the exit work through the sacrificial section.It can effectively reduce the unfavorable phenomenon caused by the additional axial force after the later strengthening of the BRB,reduce the development of the plastic hinge at the column end,reduce the risk of instability of the frame column under compression,and protect the important components in the main structure.(4)Based on the application of energy design method in steel-supported frame structure,the design method of sacrificial-energy-dissipative bracing in steel-frame-supported structure is proposed,and the cumulative hysteretic energy dissipation of BRB steel frame layer is given with reference to the time history analysis results.Conversion relationship with the cumulative hysteretic energy dissipation of the SED-supported steel frame layer.