The Toughness Test Studies Of Fiber Concretes In The Wet Joint Of Continuous Bridge Erected As Simple-supported Beam

Along with the urban development and the construction,it asked a higher request to the bridge construction's speed,and presented many forms of continuous bridge erected as simple-supported beam.After using the wet joint design the continuous bridge erected as simple-supported beam,has caused two kind of structural styles:The first kind is the bridge floor continuously or the floorboard is continual,its structural style was still a simple beam.The second kind is the structure continuously or causes the structure with the pre-stressed to be continual; its structural style is continuous beam.It not only reduced the bridge floor expansion joint quantity,but also changed support's place bridge floor dehiscence phenomenon in certain extent.But it cannot fundamentally solve the bridge floor crack which is caused by the permanent support place hogging moment.Using the high strength fiber reinforced concrete for the joint material,which is high bending,high tensile, high toughness,high anti-permeability and high durability could improve the stress performance of the wet connecting point,and prevent plant disease's occurrence. When it applies in the continuous bridge erected as simple-supported beam structure system,may improve the bridge durability,reduces later period the maintenance cost, increases the bridge service life.And it could provide the experience and the technical guarantee for other local similar city bridge construction in domestic.After analyzed the sole fiber concrete's good and bad points,the combination fiber concretes the superiority which appears initially.It is needed to further explore in the foundation,and solute questions.This article in predecessor's foundation has done the following work:(1) The continuous bridge erected as simple-supported beam has carried on the multi analysis.Introduce the continuous bridge erected as simple-supported beam bridge's pattern,makes the law,and the continuous bridge erected as simple-supported beam bridge's wet joint design.(2) Through the plain concrete,the steel fiber concretes and the steel polypropylene promiscuous fiber concretes carries on the cube compressive strength test and the curving toughness test,relate the existing literature the experimental material,the contrast has studied the steel fiber and the steel - polypropylene fiber to the concretes mechanical properties different influence.Discusses the different fibers blend to the concretes compressive strength and the plasticizing performance enhancement.Discover that the polypropylene fiber joined is not obvious to the concretes mechanical properties' change.(3) Carries on the finite element analysis to the continuous beam,which uses different material in the wet joint,like high strength steel fiber reinforced concrete (HSFC) and common concrete.By the finite element simulation,using HSFC for wet joint material could enhance continuous beam's toughness,and increase the component bearing capacity.The conclusion basically same as the result of the steel fiber to reinforce and toughen of concrete experiment.As a result,using HSFC for wet joint material could improve the wet point the stress performance,the bridge durability,reduce later period the maintenance cost and increases the bridge service life.