Experimental Research & Analysis On Seismical Performance Of Hybrid Structure With Steel Frame Strengthened Both Reinforced Core Tube And Outer Reinforced Concrete Frame

Super high-rise buildings,to some extent, represent the economical development level of a city. Choice of structural system, type of bearing members and the connection between them are very critical to their service. China, for a long time, will obtain the opportunities for super high-rise buildings development due to rapid economy. Such structural system of resisting lateral deformation may be different with height. No special consistent Codes or Specifications for such high-rise buildings, however,established in China. Unfortunately, such high-rises buildings have been or being constructed especially in seismic fortified area. No one could determine the safety under the corresponding earthquakes. It is necessary to discuses and analyze the seismic performance of such lateral resistance system for super high-rise buildings in anti-seismic zone.Now days, almost all such super high-rise buildings could be analyzed or designed only by the help of statical or dynamical test analysis and numerical simulation. Results only suit for single building, and could not be used for another such high buildings. A new lateral resistance structure system for super high-rise buildings, hybrid structure with outer steel strengthened reinforcement frame and steel frame strengthened reinforcement tube, is proposed to obtain comprehensive seismic performance.Corresponding dynamical test for a 1/10 scaled model structure designed by simulative principle is carried out to obtain floor dynamical response, deformation characteristics for such lateral resistance system. Based on the test results, a larger scaled model with1/2 for core tube is discussed fatherly by pseudo-static test, to obtain characteristics of rigid and strength, energy consume, hysteretic characteristics, anti-deformation performance and load capacity. Discuss the affection of steel frame strengthened reinforced concrete core tube both on the whole carrying capacity and ductility.Interactions and cooperative work between outer steel-concrete frame and steel frame strengthened core tube are mainly analyzed following.The main content of the paper are as follows:1.A new type of lateral structure system for super high-rise buildings is proposed,i.e. hybrid structure with outer frame and steel frame strengthened core tube, and complete structural design for such prototype structure. ETABS is used to analyze ahead of determining the section information.2. Based on similarity principle, a 1/10 model is obtained and shaking table test is carried out to analyze the dynamical response especially for earthquake.3. Dynamical response characteristic for both model structure and prototype are discussed comprehensively.4. According to the shaking table test results, a 1/2 model for steel frame strengthened concrete core tube is obtained by similarity principle. Bearing capacity,stiffness degradation, deformation characteristics, etc. are obtained by Pseudo-static test.5. Nonlinear analysis for such kind of composite concrete core tube is flowing carried out by STRAT.The aim of above research is to obtain the whole seismic performance for this new type of hybrid structure,especially for steel frame strengthened reinforced concrete core tube. Feasibility analysis is carried out to propose the use of high-rise buildings in seismic fortified area. The research results aim at to offer both analysis basis for such structural system in high-rise buildings and references for relative code and specification formulation, in order to ensure considerable development of high-rise building in China.