Research On The Test Of The Mechanical Properties Of Fresh Concrete Columns Under Aftershocks

In recent years, Affected by Frequent earthquakes of our country and the surrounding areas,5·12Wenchuan earthquake occurred, especially devastated our national economy. From the investigation after the earthquake we also found that the seismic capacity of buildings is the important reason caused casualties and property losses.Aftershocks will be accompanied after A large earthquake, therefore, influence of aftershocks on fresh concrete at the early age in the process of post-disaster reconstruction will be a high probability event. The future seismic ability of structure or component under this kind of damage has not yet reported.In this paper, reinforced concrete columns as the research object, through the test ofdifferent ages of the fresh concrete columns under different strength seismic waves on vibration table, to simulate the new poured reinforced concrete columns under seismic effects. Basis in the trial to continue the static test of which after the vibration under cyclic loading of the quasi, and set on a comparison specimens. Fracture mechanism, P-Δ and the skeleton hysteresis curve, energy consumption and carrying capacity of the specimens also were calculated and analyzed. Ultimately, use the test results to establish the resilience model of column elements at early age which were affected by the earthquake.The main conclusions of the article:template stiffness, age, seismic intensity are the most important factor of the influence on future seismic performance of specimens; the specimens which are just state the final setting and earthquakes on its impact is the most sensitive, The higher the seismic intensity experienced the worse the future seismic performance; if the outdoor temperature is relatively high,1d specimen age should be the boundaries of level of post-disaster assessment identification.