Research On Calculation Models Of Mechanical Performance Of Chinese Modern Reinforced Concrete Members In Jiangsu And Zhejiang Province

Chinese Modern RC buildings play an important role in the national architectural cultural heritage,and their characteristics of the material performance,structural configurations and design methods are different from those of current RC buildings.In order to conserve these important architectural heritages scientifically and reasonably,it is necessary to clarify the evaluation methods of the mechanical performance.The structural members of this kind of buildings in Jiangsu and Zhejiang province are taken as the objects of this research.Firstly,the material performance,structual configurations and original design methods of these members are sorted out,which provide the basis to design the bond-slip test of the RC structural members with the characteristics of the Republic of China.Next the bond-slip constitutive model is obtained by conducting the bond-slip test and it can be used to define the parameters of the double-spring elements in the discrete finite model of the RC structural members.Then the typical RC slab,RC beam and RC column members are designed,and the smeared and discrete finite model of these members are respectively established in the ANSYS to calculate the stiffness and the strength on the state of the combination of standard loads.Finally,the comparison of the bearing capacity under four different calculation methods is made.The research results of this study can be scientific guidance and theoretical basis for the structural safety assessment methods of the RC structures members with the characteristics of the Republic of China in Jiangsu and Zhejiang province.This paper is divided into five chapters:In chapter 1,the background,the current research state at home and abroad,the content and significance,the research method,and the basic structure are introduced,which points out the urgency and innovation of this research.In chapter 2,the characteristics of the materials,the constructional details,and the original design methods are taken as the breakthrough point to untangle the complicated properties of the reinforced concrete through literature research,which lays a foundation for the experimental design and the structural member design.In chapter 3,the comparison and analysis of the existing experimental research methods and data processing algorithms on the bond-slip performance of modern reinforced concrete are made,by which the four-segment ?-s curve of our national criterion is gained to be the reference model indicating the bondslip constitutive relationship of the reinforced concrete with the characteristics of the Republic of China.The pulling-out experiment is conducted,and the results can be utilized to revise the characteristic values of the reference ?-s curve which is the key point to define the parameters of the spring unit of the discrete model.In chapter 4,the RC slab,RC beam,and RC column with the characteristics of the Republic of China are designed according to the condition under a real situation.Then based on the ANSYS platform,the smeared and discrete finite models of the three members are established for gaining the stiffness and strength on the state of the combination of standard load.After that,taking the cross-section bearing capacity as the object,these numerical predictions are compared with the results of the current codes and the literature in the Republic of China.Finally,some features of the calculation methods are summarized.In chapter 5,from a more macroscopic perspective,the conclusion and value of this paper is put forward,and moreover,the deficiency and expectation are proposed for the future research in this filed.