| As a new type of building structure, hybrid structure has already used in many buildings around the world. But there are still existed a few problems in practical application. These problems restrict the popularization of hybrid structure. The current research mainly concentrated in the seismic behavior of steel reinforced concrete (SRC) column-steel beam or reinforced concrete (RC) beam joint, and the research on new type of SRC beam-column joints about simplify construction process is still little, And the majority of scholars at home and abroad in accordance with the design principles of the "weak beam strong nodes" specimen design, low cyclic loading test, such specimens occurred beam end is destruction, the baroclinic destruction of the core area in shearpilot study conducted less. The beam-column joint is the key part of structures, the performance of joints directly related to the seismic behavior of the whole structure. In the existing norms and actual projects, the forms of conformation are all use the type of column stirrups pass through the holes in the web of steel beam. But in the actual constructed, column stirrups can’t pass through the holes in steel beam’s web easily and can not guarantee the construction’s quality.This article is by improving the existing node structure in the form of steel reinforcing, the node structure forms the basis of the specification, the proposed two new node structure in the form. Will be an ordinary the nodes form of (SRCJ-01), two new types of nodes in the form of specimen (SRCJ-02, SRCJ-03) under low cyclic loads pseudo static test, study the seismic performance. The three forms of node specimens are designed in accordance with the principle of "strong beam weak column-weak node", according to the the test phenomena and the measurement data, comparative analysis of the form of each node failure pattern under low cyclic loads, ultimate bearing force, the law of strength degradation, hysteresis characteristics, energy consumption performance and key parts of the strain distribution.The test results show that:by observing the destruction of all specimens obtained form, three kinds of specimen are happened core shear baroclinic destruction, meet the test purpose, specimen SRCJ-01core column stirrups and longitudinal bar exposed, specimen SRCJ-02core area and hoop plate external drum, specimen SRCJ-03core area of U stirrup exposed; Through the comparative analysis of the three kinds of specimen hysteresis curve and skeleton curve that all specimens of the ultimate bearing capacity differ not quite, but specimen SRCJ-02and specimen SRCJ-03are avoided in the beam steel web place open, bring convenience for actual construction; Through the contrast analysis all specimens that the energy dissipation performance, each specimen displacement ductility factor and equivalent viscous damping ratio coefficient is less, that happened core shear baroclinic destruction member capability of energy consumption is poorer, ductility and poor.The finite element analysis software ABAQUS to test for finite element simulation. Through the comparative analysis, finite element calculation results and the test results are compared to verify the steel reinforced concrete beam-column joints in finite element analysis, the feasibility and reliability. Change the column section steel web thickNess and the axial compressive ratio parameters, the establishment of model and finite element calculation and analysis, based on the analysis of the simulation results obtained, increases the column web thickNess and increase the axial compressive ratio, can improve the node of ultimate bearing capacity, the seismic performance has also improved.The research results to put forward reasonable stress, is advantageous for the construction of the new type of beam-column node form provides experimental data and theoretical basis, not only make construction process is simplified, still make the construction quality guaranteed. |
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