Loading On Internal Force Of Influence Surface Of Bridge Based On Second Development Of ANSYS

With the limitation of the road line and to pursue more good-looking structures,thesuperstructureofurbanbridges tends toadopt box-sectioncontinuousgirders,andthere have appeared many bridges with wide flange box girders, curved girders andskew girders. Live load effect of bridges is chiefly the deformation and the internalforce under the live load, and the transverse distribution theory is considered as thefoundation of live load effect at present, in which a three-dimension model of thestructure is changed to planar analysis. The advantages of this method lie in explicitconception and simpler calculation, but it will bring considerable errors incomplicatedstructuralanalysis.In view of this, internal force of influence surface which is approximate to thestructure's actual stress can get the most negative influence of any division and theanalysis of bridge tallies with the actual situation. Software in rapidly calculating themostunfavorableloadingpositionandthelargeststressisnecessary.The automotive method and definition method are presently used in calculationinfluence surface, but the two methods can not meet the needs of practicalengineering. In this paper, based on ANSYS, the technology problem about thesolution of the equivalent load is solved by selecting a subset of element. Thealgorithm can quicklyanalyze the average stress of influence surface about plane andsolid elements, and the average internal force of influence surface about plane andshell elements. For solid element, the internal force of influence surface can not begained through the exiting theory. According to the relationship of stress and internalforce, it will be obtained byusing principle of superposition. Based on the secondarydevelopment of ANSYS,This thesis mainly study menus applying UIDL programsandalgorithmapplyingAPDL.WithconformityofAPDLandUIDL,influencesurfaceand live-load are solved.The software has a friendly interface, reliable and stablerunning and is convenient to operate. It is the important change in the history ofconstituting process with advanced language which has low efficiency during...