Design Of And Analysis On The Splice Along The Length Of Large-capacity Boiler Board Girder

Due to the advantages of improving the utilization efficiency of energy, andreducing the pollutant emissions, larger capacity and higher parameters become thetrend of the development. As the main member, big board girder bears thousands oftons weight of the boiler suspended below, and transfers the load to the tower. Thesize and weight of the girders become an important factor affecting the cost andefficiency of transportation and installation. And with the increment of boilercapacity, this problem becomes more and more important. Currently, the mostwidely used method is to splice the girder along the height and length directionrespectively. While matured methods has been developed for the problem of splicealong the height, there are few research on and practical application of the problemalong the length direction. Based on the splice project of board girders of the boilerplant located at the NongLiuShi of Xinjiang Province, this thesis conducted researchon the problem of splice along the length of board girder by numerical simulation.The main works are as follows:Part1: Use the existing codes and handbooks and mechanical knowledge tofinish the splice design along the length of board girders, and give the layout ofbolts and plates followed by checking the security of them.Part2: Use the finite element analysis software ANSYS to complete theanalysis of splice position along the length of board girder, and compare themechanical properties under different cut position, then give the correspondingconclusions with consideration of the engineering practice.Part3: Use ANSYS to analyze the influence of the manufacture and installationerrors such as thickness and tolerances on friction loss of the spliced board girder.Part4: Use finite element analysis software ABAQUS to build the3-dimentionsolid model of bolts and steel plates, perform local analysis of splice node, anddiscuss the influence of factors, such as bolt space and pretension force, on boltforce and stress distribution.