The Study Of The Dynamic Properties And Damage Of High Strength Concrete

Ultra high-rise buildings will be one of the main points of city construction in the next20to30years, especially in the pleistosismic zone.Basied on steel structure, concrete structure, steel-concrete composite structure, steelconcrete mixed structure of of typical high-rise building structure, the development ofefficient super high-rise building structure system and its high-performance components, andstudy them under strong earthquakethe key effect of the earthquake disaster and theearthquake disaster, the whole process of common problems, reveal the structural mechanismof earthquake damage and destruction of the collapse mechanism is particularly urgent. Withthe increase of super-high-rise buildings, high-strength concrete applications is becomingincreasingly popular, the paper studies the characteristics of high strength concrete on thesuper-high-rise buildings, considering the damage constitutive characteristics, injurycharacteristics under different strain rates for safe construction and operation ofsuper-high-rise buildings in China to provide scientific support.There are two major branches in damage mechanics: the first is the continuum damagemechanics, the second is the mesoscopic damage mechanics. In this paper, made a moredetailed introduction. According to the different classification of injury, injury can be dividedinto elastic damage, elastoplastic damage, creep damage, corrosion damage, fatigue spallingdamage, irradiation damage. This paper mainly discusses suitable for high-strength concretedamage plasticity constitutive and the test was simulated using the finite element software.Support from The National Natural Science Foundation " super tall buildings understrong earthquake damage mechanism and failure process (90815029)", through repeated tests,test succeeded C80concrete, and produced36C80high strength concrete, the high strengthconcrete cube compression strength test, the prism axis compressive strength test, staticmodulus of elasticity in compression, experimental study of its consideration of the materialdamage constitutive model.In order to better reveal the high strength concrete under dynamic loads and damagemechanism of material properties, making it closer to the earthquake condition, this paperalso uses high-strength concrete test piece to do dynamic force of damage of concretecompression test. The high strength concrete with different strain rate compression test,analysis of the dynamic characteristics and dynamic damage characteristics, study of thestrain rate on compressive strength, elastic modulus, the damage evolution effect. The results show that with increasing strain rate, compressive ultimate strength of concretecorrespondingly increased, and the fracture surface damage of aggregate increasedsignificantly but critical strain decreases, concrete elastic modulus with increasing strain rateis not obvious conclusion.Through the finite element software ABAQUS, use inside the damaged plasticity model,simulation of the high strength concrete compressive failure process, and test.The basic mechanical properties of high strength concrete applied to super tall buildingstructure calculation according to the testing of C80concrete mechanical properties, used inthe shaking table of a Guangzhou high-rise building. Applicating of ETABS software studythe vibration of the structure model.