The Detection And Identification Of Structure And Study Of Mechanical Behavior For Ferro-cement U-type Aqueduct

In the fifties and sixties of the twentieth century, water workers in Zhanjiang,Guangdong province, firstly adopted ferro-cement thin-walled structures in aqueductproject at home and abroad. Ferro-cement thin-walled aqueduct has the advantages oflower construction cost, building materials savings, short construction period and soon, and fully conform to the circumstances of the shortage of domestic funds,materials scarcity at that period. Therefore, the steel mesh thin-walled aqueduct waswidely promoted in the nation, Hunan Province alone has extended range up to morethan60kilometers of this kind of aqueduct. In the specific time, steel wire meshthin-walled aqueduct played a huge economic and social benefits to some extent, butthe durability of the structure type can be poor. After nearly50years of use, manyaqueducts close to the structural design life, and with varying degrees of signs ofaging. Therefore, to detection and identification of such structures has a very greatpractical significance, and the results of the detection and identification of suchstructural is an important reference for the reinforcement scheme optimization ordemolition and reconstruction projects. Against this background, I chose HuangcaiIrrigation fishpond aqueduct engineering in Hunan Province as a project example, andanalysed the Mechanical properties of the aqueduct. The main contents include thefollowing aspects.First of all, this thesis introduce the knowledge about the aqueduct, it includingthe definition, function, development, level divided, classification of the hydraulicstructure aqueduct and basic material for the design of a aqueduct.Fishpond aqueduct located in Huangcai Irrigation District. It is Equal span anddouble cantilever aqueduct which made of Ferro-cement and U-shaped. After tworepairs, the structure of break cross section of the Fishpond aqueduct which with theinter-double cantilever steel mesh shell structure, are the multilayer shells groovecomposite structure. On the basis of finding out the mechanical properties, weimplement the detection and identification to the aqueduct. The content of detectionconsist of the information of the cross-section composition, strength of materials andinterface connection conditions, and the Elastic modulus of the fishpond aqueduct.Through on-site load test, we measured the strain value, vertical and horizontalcontrol points of the control section of the aqueduct displacement. Then made a comparison with the material properties and deformation limits. This paper usesANSYS finite element software to establish the aqueduct model, to simulate theinternal forces and deformation in the aqueduct under the design water level, tocompare the differences between the results of field test structure and modeling teststructure ones, and to analyze the causes of those differences.According to the field trials and modeling analysis, we put forward a clearassessment of the Bearing capacity and the Normal use of the aqueduct, pose themethods to analyze and evaluate the safety performance of such kind of structure typeaqueduct, and proposed reinforcement measures to strengthen the durability of theaqueduct whose safety performance is good.