Quasi-static Experimental Study On Seismicperformance Of Typical Mountain Cliff-structure

Cliff-structure as a typical form of mountain building, because of its uniquearchitectural style,in the mountain city and Plain slope are more widely used.Cliff-structure has different height of locations, the force characteristics and earthquakedeformation, failure characteristics will be different from the conventional flatstructure,compared with the conventional seismic design of structure is more complex,no existing norms to be used, it is necessary to take further research. Currently, ourgroup and otherscholars have been many studies on the seismic performancecomputational analysis cliff-structure, however, not for experiments and research,andin the seismic design of earthquake damage control mode and indicators yet to thesame conclusion.In this paper, a ratio of1:4reduced scale specimens of the5-storeyand3-spanreinforced concrete frame cliff-structure as the research object,conducted in low-cycleload displacement controlled pseudo-static test, respectively, from the experimentalphenomena, mechanical characteristics, failure characteristics, hysteretic behavior anddeformation properties of other aspects of the analysis; Pushover analysis has beenconducted and the corresponding original model test structure model of elastic-plastictime history analysis, by comparison with the test results, verify the correctness ofcalculation and analysis model; designseveral differentoff-layer floors orspanscliff-structuremodel example, investigate the equivalent lateral stiffness ratio onthe seismic performance of the structure off the floor.The main conclusions of thestudy are as follows:①The test results show that Bottom of the column on upper floors and its topnode Serious damage,the up floor is a large part of the deformation; the failure modecan be generalized as “beam-column mixed hinges”, the levels of damage of columnhinges are more serious than beam hinges. And the relationship of hysteretic of theoverall structureshow the test model has better ductility,while not significantlyreducing the carrying capacity.②Comparison with experimental results showed that OpenSEES can bettersimulate earthquake cliff-structurestrong nonlinear response. The analysis results showthat,with or without pull-beam on the cliff-structure of the hinge in beams, sheardistribution aspects hysteretic behavior, power transmission lines, etc. have significantly different.③No pull-beam structures consisting of the column on upper floors bear,whilethe pull-beam structure is composed of two columns that linked by the pull-beambear.The no pull beam model in the same layer, the shear distribution is obviousdifferences,and the same pillar shear vary greatly,the1,2layer beam has axial forcethat can’t be ignored,that beam has the effect to redistributecolumn shear force; to thepull-beamstructures,column shear distribution more inclined to mean, The1,2layerbeam with axial forcereduced, at the same time the pull beam axial force larger.④For structures under the equivalent lateral stiffness ratio is used as the stiffnesscontrol index fell seismic cliff-structure, With the fall of layers and spans, the swapratio increased lateral stiffness across the equivalent number declined.