Application Research Of Reactive Powder Concrete On Footbridge

During the 1990 s, a new type of steel fiber reinforced cement based composites called Reactive Powder Concrete was developed by a company in France. Compared with ordinary concrete, Reactive Powder Concrete not only has a u ltra-high compressive strength, but also has a higher tensile strength and excellent durability and ductility. In order to fully understand the properties of Reactive Powder Concrete, and to further investigate the practicability of applying Reactive Powder Concrte to footbridge. This thesis carries out the main work of the following aspects:Firstly, this thesis begins with experimental research of RPC mix ratio, in order to obtain a fine mix ratio which using domestic common materials. And exploring the influence factors of RPC performance by carrying out several comparing experiment.Secondly, this thesis obtained mechanical properties of RPC by carrying out the cube compressive strength experiment and axial compression experiment. And obtains the stress-strain curve equation by fitting with the experimental stress-strain curve.Still, there isn’t a perfect-fitting theory for RPC Structure calculation in our country now. Therefore, this thesis investigates the whole process of reinforced RPC beams from loading to failure theoretically. Then, by establishing a calculation model of the cross section of RPC flexural beam, this thesis deduces a calculation method of cracking moment and ultimate bearing capacity.At last, in our country there is still no main structure of the construction which using RPC. Therefore, this thesis designed a footbridge which using RPC plate- Steel truss composite beam as the main structure for the first time in our country. By building a model of the footbridge by using the finite element software Midas Civil and analyzing the force and deformation of the footbridge under the pedestrian load and weight. Then estimated the feasibility of applying RPC to practical engineering structure by comparing the analysis result to the national standard.This thesis has important forward-looking implications on the using of RPC in the field of bridge engineering. Because RPC is such a material with excellent performance, applying RPC to footbridge can not only reduce the weight of bridge, but also enhance the durability of the bridge and reduce the maintenance costs of the operation stage.