Study On Bridge Motive Force Loads In The Trial, And The Self-vibration Property Test Loads The Test With The Shock

The bridge is one of important traffic installation . The bridge is tested and has been got attaching importance to of extensive increasingly the advance of development along with the traffic cause and science and technology , and among them moving a year trial is an important part in the bridge checkout again . Bridge dynamics is an important subject that the modern bridge was developed . On the one hand on the other hand it can more truly announce out the bridge structure and load that the trends that act ons down receive power with becoming deformed essence at the automobile vehicle , and can influence at the system that the earthquake acted on down by a description bridge structure again . But purely by way of theory model building gain the motive force property self passes through and can not satisfy this requirement , and needs to pass through solid to survey proofreading and correct theory model , thus makes perfect the mechanics model . Up to the present by way of vibration test and analysis , recogniseing the bridge self-vibration property , and is , the most reliable method . The vibration test is the initial data that procures the structure vibration , and is usually the time course of acceleration . And but the signal analysis is measuring the initial data that gets by way of analysing , and recognisees simulating state . This two aspect had already possessed fixed independence , and is closely contacted together again . The self-vibration property measurement method includes the content of this two aspect . Cause that the bridge structure gives rise to vibration the outside loads , and chiefly is the various vehicles frequently go on the bridge load to cause that the outside that the bridge structure gave rise to the vibration loads ,in addition , still has pnematicly to load and the earthquake to load etc . Namely mentioned abovely various loading motive force that gives rise to loads roughly concluding for the three kinds moulds , lashes to load and vibrates to load as well as two motive force that jointly acts on loading . It is fairly more complicated to lash the influence loading to the bridge , and will count and analyse to receiving the power position to dash power.That the bridge moves major content and the method year testing has been summed up that by this text , and has studied now available major several kinds of bridges moving year a tests technology , and has been in progress fairly to his scope of application and good and bad , and has fairly systematically summed up the simulating state test technology moving theory foundation - structure of year test, and reaches the problem that is faced with in the real spectral analysis function as for the trial step to have carried on concluding the summary . With the abundant expressway whirling river of Bo the big bridge ( prestressing force continuously chest mould beam bridge ) is the living example , the parsing process of course signal detailedly discussed that applying overheads travelling crane to encourage the method of law and jumping car trial capturing bridge self-vibration property and the acceleration time . Has been in progress the analysis as for solid each steps simulating state self-vibration frequency surveying with mould shaking as well as damping ratio and shock coefficient, and has comparatively accurately given out the reality of big bridge of whirling river to survey the dynamics property parameter . At the 5th chapter still in 2007 9 months Tonglin City Changjiang River Bridge boat that occurs of 6 days collide the accident has been in progress the analysis , and that the influence that to the bridge creates assesses is loaded that to the shock during the external ministry loads.