The Research Of The Seismic Performance Of RC Frame Column In Artificial Simulated Acid Rain Environment

RC frame Column is one of important vertical load-bearing elements in RC building.But it is very easy damaged by earthquake disaster. However, RC frame column affects the performance of security and using of building. As result, this is significantly research RC frame column’s seismic performance. RC frame column’sdurability is decreasing in pace with building’s age, which could affect other building’s performances are decreased. Therefore, it is meaningfully consider durability degeneration when researching the performance of RC frame column in earthquake.Many regions of China are affected by severe acid rain. Acid rain is an important indicator in the research of structural seismic, because acid rain could corrodes concrete and then affects building’s structure performance. Simulation of RC frame column’s performance deterioration in acid rain through the test of accelerates corrosion under artificial simulated acid rain environment. The test result indicated this method facilitates to simulate environment of RC frame column’s deteriorate performance in acid rain.This test total made 12 RC frame columns, which includes 6 long columns and 6 short columns. The researcher designed different corrosion level, axial compression ratio and stirrup ratio to investigate static loading test of RC frame columns. This test result indicated acid rain mainly corrodes RC frame’s concrete, which affects frame columns’ performances of ductility, stiffness, strength and energy were decreased. The axial compression ratio diversification result was same as intact specimen text result, which improves specimen’s carrying capacity and decrease specimen ductility; Furthermore, Column’s damage method is changed by increasing carrying capacityand increasing stirrup ratio. Based on the data of test result, the RC frame columns’ mechanical performance was investigated by carrying capacity, ductility and stirrup ratio through quantitative analysis method.In this test, the researcher achieved specimen’s hysteresis curve, skeleton curve, stiffness degradation curve, strength degradation curve and energy saving curvewhich were affected by different factors. Moreover, ductility performance was analysed by calculated each specimen’s ductility coefficient.The formula of RC frame column’s eigenvalues degradation was identified by considered both of test data and Trilinear skeleton curve of Negative stiffness segment. Based on degradation index of hysteretic energy, model which established by the researcher is significantly considered strength degradation, unloading stiffness degradation, hardening stiffness degradation and reloaded stiffness accelerated degradation Comparison of the results betweenmodel and test, which showed the modelhas worthy applicability, because it can real reflect the degenerate performance of corrosion specimenin Earthquake.