Mechanical Analysis Of Reinforced Concrete Continuous Beam Damage The Local Stiffness

Reinforced concrete continuous girder bridge in the process of use, due to long periods of moving load and temperature load, the inevitable impact force damage, and so on many aspects of complex factors, cause local concrete spalling and local stiffness damage and consequences such as section size change. These phenomena can lead to the change of the internal force of bridge, which led to a decline in bridge carrying capacity, the normal use of the bridge and a serious threat to safety performance.For the research of damage after such as highly reinforced concrete continuous box girder internal force variation law and damage location, the Midas software simulation, using the change of the stiffness to modify damage parameters, by comparing the summarizes the change laws of mechanical properties.(1),internal and external research situation, this paper introduces the finite element calculation of section continuous beam theory.(2) the results at home and abroad for reference, analysis of different damage cases, concrete continuous beam damage after continuous beam model was established based on finite element software Midas, extract data to establish the model of continuous beam internal force, a correlation analysis.(3) define a damage, continuous beam damage model is established, using the symmetry between counteracting force three times difference, according to three times the counteracting force difference curve, through damage curve mutations in law, determine the damage location. Similarly, the side span deflection and corner of three, second difference, can also according to get the curve of the mutation position and range, accurately determine the damage location.