Research On Bearing Capacity Of An Arch Bridge Strengthened By HTRCS Composite Materials

HTRCS full name is High Toughness Resin Concrete with Steel Wire Mesh,who has many advantages such as high strength,good insulation,fast condensation,etc.It has innate advantages in bridge reinforcement.And now the most reserches about HTRCS are on beam bridge reinforcement.However,in the case of a varity of diseases such as corrosion,damage,etc.and traffic volume continual increase.Arch bridge as a bridge with a long history faced on the problem of repair and reinforcement.Therefore,it is of great significance to use HTRCS composites to reinforce arch bridge.In this thesis,the effect of using HTRCS composites to reinforce arch bridges is studied.The influence parameters of reinforcement are mainly analyzed,and the method of reinforcement of arch ribs is optimized.First of all,HTRCS composites were subjected to material tests.The tests included compressive strength test,tensile strength test,elastic modulus test,constitutive relationship test,and HTRCS substrate and concrete bondability test.The experimental data were analyzed and fitted,and then used as the basic data for the arch bridge reinforcement material simulation.The second part is to establish the finite element model before and after reinforcement.In order to simplify the model,calculate the equivalent stiffness of the composite material before modeling.At the same time,the reinforcement iMPact parameters were analyzed and the rib reinforcement scheme was designed.The model was built by Midas Civil and ANSYS Work bench,and the effects of various parameters were analyzed by numerical simulation results.Finally,an optimal reinforcement scheme is proposed for the arch bridge reinforcement model.The theoretical analysis show that when the 10 cm HTRCS composite material(5 layers of high-strength steel wire mesh)is reinforced on the lower surface of the arch rib,the bearing capacity is increased by 24.64% compared with the original arch rib model;when using a small surface reinforcement,the bearing capacity of the same reinforced material is increased by 31.57%;When the upper surface is reinforced,the bearing capacity of the same reinforcing material is increased by 31.57%;When using the subsection optimization reinforcement method,the bearing capacity increased by 34.23% compared with the unreinforced model.