Investigation And Study On Constructional Quality Control Of Concrete Structure In Situ

With the development of economy in our country, the new technology in building engineering are used continuously. The older codes for construction and acceptance can not be satisfactory to the necessary of controlling the constructional quality. To strenghthen the supervision to the quality of the building project, the checking will be separated from ascertain and the ascertain will be strengthened, the measurment will be perfected and the process will be controlled were pointed out by Ministry of Construction China. As this background, the newly revised versions of code acceptance of constructional quality(2001 > 2002 edition) were published and carried out.This essay presents the statistical analysis of reinforced concrete structures on the main line of defects and section dimension deviations in cast-in-site concrect structure. Moreover, the allowable for construction quality errors are checked. The main contents in this essay follow as:In the first chapter, The general situation principles and the technical characters of the newly revised version of nation standard "Code for Acceptance of Constructional Quality of Concrect Structures"(GB50204-2002) are in details. At the same time, the changing process of the code for acceptance of constructional quality is simply introduced.In the second chapter, basic theory about the mathematical statistics and the structural reliability in this paper. Such as parameter estimation types of statistics distribution tests of distribution hypothesis methods of linear-second order moment, ect.In the third chapter, statistics analysis and investigation of defeats in cast-in-situ concrete structure. The results from this paper show that defeats incast-in-situ concrete structure yield with the possion distribution, the parameters are estimated. In the last, the causes of quality problems are analized and the suggestions are gived as well.In the forth chapter, statistics analysis and investigation of section dimension deviations in cast-in-site concrect structure. In this paper, a surrvey on section dimension and axis line deviations had been conducted. It has found that section dimension deviations yield with normal distribution; axis line deviations yield with lognormal distribution. It is also shown that the allowable errors for section dimension are loose and the allowable errors for axis line deviations are suitable in the "Code for Acceptance of Constructional Quality of Concrect Structures"(GB50204-2002).In the fifth chapter: the conclusion and the outlook. This chapter summarizes the major conclusion which the paper studies.Meanwhile, it points out we have a lot of research works to do in the range of reinforced concrecte.