Study on fatigue performance of welded joints of steel mesh for bridge deck pavement
In order to understand the fatigue resistance of welded steel mesh in bridge decks,guide engineering applications and performance improvement,CRB550 grade cold-rolled steel bars were welded into steel mesh,and high cycle fatigue tests were conducted on specimens with welded joints.The results showed that the steel mesh would produce many primary defects during the welding process.Under fatigue load,the crack source area was distributed along the weld seam,and the crack propagation area was larger,with more secondary cracks and voids.As a result,the elastic modulus of specimens with welded joints decreased faster than that of the base metal,and the fatigue life was shorter.Under stress loading levels of 0.55Rp0.2,0.6Rp0.2,0.65Rp0.2,0.7Rp02,the fatigue life of welded joints was reduced by 31.5％,48.38％,47.98％and 26.99％compared to the base metal specimens respectively.Based on the experimental results,a stress-life power function prediction model for welded joints of steel mesh was established,which could analyze the life value of steel mesh under any stress level and provide reference for engineering practice.
NETL
NSTL
万方数据
