Analysis Of Influencing Factors Of Seismic Resistance Of Assembled Frame Structures

Theconcrete structure has the advantages of short construction period,high product quality,low energy consumption and small environmental pollution.It is an inevitablechoice to realize the sustainable development of the construction industry.One of the challenges of the fabricated frame structure is the node connection problem.Especially the beam-column joint connection problem,the advantages and disadvantagesof beam-column joint connection directly affect the seismic performance of the whole frame structure.In this paper,the beam-bar joints of the assembly frame are taken as the research object,and the influence of the energy dissipation reinforcement on the failure mode and energy dissipation capacity of the steel structure is studied.The overallimpact of seismic performance.This article line of thought mainly from the following aspects:(1)This paper models the prefabricated frame structure nodes.Under the OpenSEES finite element software,the appropriate material element and the cross-section position are selected and the appropriate beam-column joint model is established.The stress model of the nodal model under different working conditions is analyzed and compared.And the impact of the destruction of the form.(2)Simulation of prefabricated frame structure and cast-in-place structure model in OpenSEES software,and reinforcement of the two structures.In order to make the analysis more accurate and targeted,the two structures are used a four-story three-span structure,the same beam and column section size and stress environment to design.(3)In the two OpenSEES structural models,the static non-linear analysis Pushover analysis is carried out to obtain the top-displacement curve of the two frame structures.The bearing capacity of the prefabricated frame structure is lower than that of the cast-in-situ frame structure,and the bearing capacity of the prefabricated frame structure is lower than that of the cast-in-situ frame structure.(4)Nonlinear time-history analysis is carried out under two OpenSEES structural models,and time-series analysis is used for the two framework models.The maximum lateral displacement of the assembled frame structure is still slightly smaller than the maximum lateral displacement of the cast-in-place structure.The trend of the displacement angle between the two structures is basically the same,and with the increase of the cross-sectional area of the energy-The interlayerdisplacement of the frame structure and the interlaminar displacement angle of each layer are also gradually reduced.In the stress and strain of energy-consuming steel bars,the cross-sectional area of energy-consuming steel bars increases,and the strain of steel bars decreases,and the residual strain value of reinforced structures is much smaller than that of cast-in-place structures.In this paper,it is found that the failure modes of the two structures are similar,but the carrying capacity of the assembled frame structure is slightly lower than that of the cast-in-situ structure,and its self-recovery ability and residual strain control ability and overall seismic performance are better.