The Corrosion Of Acid Rain Behind The Recycled Concrete Filled Steel Tube Column Eccentric Compression Test And Theory Research

Along with the rapid development of urban economy, produce a large amount of waste concrete, waste concrete not only takes up a lot of arable land and the natural environment also can cause a certain degree of negative impact, if we can put the waste concrete to good use, will have very important practical significance. Concrete-filled steel tube column are mostly reality environment for a long time exposed to air, will inevitably affected by acid rain corrosion environment, further to the limit of specimen compressive bearing capacity and durability will cause great negative impact, so the recycled concrete filled steel tube column on the corrosion of acid rain rear eccentric compression test and theory research has important practical significance.The square square steel tube recycled concrete and ordinary concrete filled steel tube column eccentric compressive specimens studied the electrochemical corrosion test and mechanics test. Further to the whole process of the finite element simulation of all specimens, compared to the damage form of specimens and the working mechanism of typical components analysis. Finally put forward the corrosion of acid rain behind the steel tube recycled concrete eccentric compression bearing capacity calculation method. The main work is as follows:(1) The electrochemical accelerated corrosion test specimens in solution of acid rain in a certain extent, in line with the Faraday law of electrochemical corrosion, the corrosion rate is not high, the wall thickness of the steel can be predicted quantitative reduction is.(2) With eccentricity(e = 25 mm, 50 mm) and aggregate type(normal, regeneration) and corrosion degree(? = 0 %, 10 %, 20 %) as the main change parameters on all of the eccentric compression test specimens, eccentric compression experiment research: the damage form of specimens, the different changing parameters on the load- vertical compression ratio relation curves of the specimens, paths of the load- the influence law of longitudinal strain curve. The results show that with the increase of corrosion degree ultimate compressive bearing capacity of the specimens were presents a certain degree of decreasing trend; Different types of aggregate has no obvious effect on stiffness specimen ultimate bearing capacity and the previous law; Eccentricity, the greater the specimen before reaching eccentric compression peak load of the compression ratio is, the bigger the stiffness fell, peak load after the better ductility.(3) To all other load-vertical compression ratio relation curves of whole process simulation analysis, the calculation results of ultimate bearing capacity and the test results in line with the good. Further damage to the eccentric compression test of the specimens, comparing the modal and damage theory modal of typical specimen vertical load in the process of stress distribution, force between steel tube and core concrete, steel tube and core concrete theoretical research on the stress distribution nephogram.(4) Assumes that the corrosion of steel plate thickness evenly in the process of reducing, considering the outer steel tube wall thickness reduction method, utilizing the bearing capacity of the existing calculation method to calculate the corrosion of acid rain of common(renewable) after reinforced concrete eccentric compressive ultimate bearing capacity.