Experimental Study On Seismic Behavior Of RC Column-beam Joint Built In Traditional Style

The modern architecture of traditional style has gradually become popular withthe study and innovation of traditional culture. It is the inheritance and innovation ofthe traditional architectures in the region, and is a good carrier of regional architecturalculture. Currently, the modern architectures of traditional style are mainly reinforcedconcrete structures and steel structures, and reinforced concrete structures dominate.Their mechanical properties, seismic performance and design method are very differentfrom the conventional reinforced concrete structures, which is because the modernarchitectures of traditional style are restrained largely in the size and constructivemethod of structure members and joints when meet the art form demand in structuremembers and joints. When comes to the structure design of the modern architectures oftraditional style, there are still no relevant regulations in the current specifications.Thus, the conception that it is same with the design of conventional reinforced concreteconstructions would inevitably lead to errors. In this paper, through the quasi static testconducted on the reinforced concrete beam-column interior joints of the modernarchitecture of traditional style, the seismic behavior and shear bearing capacity of thejoints which are important to the structural safety are studied, in order to provide thebasis and reference for project designing and constructing of these architecture. Themain research contents and harvests are as follows:(1)4specimens of the reinforced concrete beam-column interior joints of themodern architectures of traditional style on the scale of1:1.5were tested through thequasi static test, they were divided in two groups according to the parameter ofvolume-strip ratio or the space between double beams. Through observing the failure process in the core zones and the failure pattern of the joints appeared in the test, theconclusion that the failure characteristic of the interior joints of traditional style wereobtained:(a)3small core zones appeared in the joints of traditional style duringloading. And cross diagonal shearing cracks like “X” appeared in all the three coreswhen the joint destroyed ultimately in shear failure；(b) As well as the initial cracking,the final shear failure occurred in the bottom of the lower core.(2) This paper contrasts and analyses the seismic performance of the4specimens which are the reinforced concrete beam-column interior joints of themodern architecture of traditional style, from the following perspectives: hystereticbehavior, skeleton curve, degradation of stiffness, the ductility and energy dissipationcapacity and so on. The effect on the seismic performance of the specimens withdifferent parameter of volume-strip ratio are studied; while a comparative analysis areconducted about the influence on the seismic performance of the joints with differentspace between double beams. The results shows that: with the increasing ofstirrupratio, the carrying capacity of joints, the energy dissipative coefficient at limit state andductility coefficient increases in different degree, and the load-displacementhysteretic curve of the joints become more full. When the space between double beamsgrows, the carrying capacity of joints increases partly, while the energy dissipativecoefficient at limit state and ductility coefficient at limit state reduce, and theplumpness of the load-displacement hysteretic curve of the joints decreases. Generallyspeaking, as to displacement ductility ratio and the energy dissipative coefficient atlimit state, the reinforced concrete beam-column interior joints of the modernarchitectures of traditional style are worse than conventional joints, and the ductilityand energy dissipation capacity are relatively poor.(3) Through the analysis of test results, the stress(failure) pattern of the interiorjoints are illustrated, and the shear mechanism and main factors on shear capacity areanalyzed, and on the basis of the shear mechanism and test dates, the formula of crackand shear capacity of the interior joints are put forward.(4) Afinite element simulation is conducted on the RC column-beam joint built intraditional style to analyze the effect under the monotonic load by finite elementanalysis software ABAQUS6.12. Firstly, the feasibility is verified by the comparison of node model finite element analysis and experience result. On this basis, the rationalityof stress mechanism of the RC column-beam joint built in traditional style, suggestedpreamble is verified through finite element analysis. The joint seismic propertyinfluence law is summarized through further parametric analysis aiming at a few keyinfluence factors such as volume-stirrup ratio, the upper and lower beam spacing andaxial compression ratio.