The Impact Studies Of Steel Reinforced Concrete Bonding Characteristics On Pier Work Performance

Pier is a major component of the hydropower project discharge structures, one of the key buildings to subjected to the floodgate force and ensure the normal operation of the sluice. With the development of water conservancy and hydropower in our country, the working head of water conservancy hub is rising and the force is increasing, conventional reinforced concrete pier has become increasingly difficult to meet the demand for safe and effective operation. So it is necessary to seek a new pier structure to ensure the pier can be reliable operating at high thrust. According to the available studies, the structure of steel reinforced concrete (SRC) has better bearing capacity, high rigidity, good ductility and energy dissipation. Its application in the pier can better meet the requirements of pier reliable operation at large thrust. But few studies are on the steel reinforced concrete pier at home and abroad, and these studies have avoided the bond-slip problem between steel and concrete, while the basis of steel and concrete working together in SRC structure is the natural bonding between steel and concrete, rely on the role of the bonding can play the advantages of steel reinforced concrete structure. To reveal the impact of the bond-slip properties of section steel and concrete on the work performance of pier, this paper base on existing research results, combine with the proposed project, and introduce spring element to analyze the influence of section steel concrete bond properties on the work performance of pier in numerical analysis, and further improve the study of steel reinforced concrete pier.In this paper, ANSYS finite element analysis software is used to simulate, and analyze the influence of steel reinforced concrete bond characteristic on the pier work performance from the bond-slip between steel and concrete, the pier displacement, stress and crack, etc..On the basis, the paper further explore the influence law of different protective layer thickness and different embeded length of section steel on SRC bond characteristic and pier work performance. The analysis shows that:(1) Compared with steel reinforced concrete beam and column of Building construction, the timing of the steel reinforced concrete pier bond slip occurres earlier, the initial slip load is 50%-65% of the ultimate load.(2) With the increasing of load, along the length direction of the section steel, the steel reinforced concrete bond slip at corbel would be showing a trend similar to the logarithmic distribution profiles, and the steel reinforced concrete bond slip in pier body would be showing a similar exponential distribution trend.(3) The bond characteristic of steel reinforced concrete is not much impact on the overall displacement of pier, but larger impact on the local displacement.(4) At first, with protective layer thickness and embedded length of section steel increasing, bond characteristic of steel reinforced concrete improve; When the protective layer thickness and the embeded length of section steel reaches a certain value, bond characteristic of steel reinforced concrete will not ascend and tends to be stable.(5) Before the bond slip of SRC appears, protective layer thickness and embedded length of section steel is almost no impact on pier work performance; But after SRC bond slip occurs, protective layer thickNess and embedded length of section steel have larger impact on the pier work performance, and the protective layer thickness’s impact is different from the embedded length’s.(6) Protective layer thickness has little impact on various stages cracking trends of pier, but has a great effect on various stages cracking loads; Whereas embeded length of section steel has no significant effect on various stages cracking loads, but the crack distribution in pier decreases with steel embeded length increases under same load.