Design Method Of Transverse Load Distribution Of Continuous T Girder Bridge And Its Experimental Study

In recent years, with the rapidly development of Highway construction especiallyhighway-building, continuous T girder bridge is a type of bridge that widely adopted in theconstruction of road network of China. Based on the characteristics of this type (middle orsmall span) structure, this paper built two finite-element models of different element typesand analyzed the optimum finite element method of the transverse load distribution. Andresearched the method suitable for calculating the transverse load distributionof this type bridge, then compared with finite element method. Meanwhile, made aloading test on a bridge and performed to validate the finite element model and the transverseload distribution of this type bridge. Finally, parameters influencing transverse loaddistribution were discussed, and the main influencing parameters were picked up. The mainworks in this paper are as follows:1、 Summarised the research background and significance of this problem. Andsystematic elaborated the main characteristics of this continuous T girder bridge. Also thedomestic and overseas present research works of its transverse load distribution wereintroduced. Then introduced fundamental theory of shell element in the ANSYS imply. Finally,the main works of this paper were stated.2、Introduced simplify methods for calculating transverse load distribution.3、Took a five beams of continuous T girder bridge for example, choosing two finiteelements and modeling analysis. Using influence line of deflection and strain influence line tocalculate the transverse load distribution of each piece of main girder under load. Andcompared with the calculated results of two methods, concluded that the optimum finiteelement method of this type of bridge. Then calculated the transverse load distributioncoefficient respectively by methods of traditional theory. It compared with finite elementmethod and analyzed. Concluded that regularity of the transverse load distribution and putforward the most suitable algorithm and advice of the influence line of the transverse loaddistribution.4、Made a loading test on the bridge. Based on the result of static loading test, analyzedregularity of the transverse load distribution and compared with the theoretical method of thetransverse load distribution coefficient in order to verify the accuracy of finite element model.Then found out the measured value and theoretical value, and gave the contrast analysis ofthem, and verify the model. Rechecked the existing theory of transverse load distributioncoefficient and offered fixed theoretical foundation for simplified calculation of spatial structure.5、 Based on a five beams of continuous T girder bridge of finite element model in thethird chapter, parameters influencing transverse load distribution were discussed. This chaptervalued the influence and sensibility of transverse load distribution coefficient by the maininfluencing parameters including different numbers of beams, different span values, differentnumbers of span, various oblique angles and different stiffness of horizontal beam. Theregularity of the transverse load distribution for continuous T girder bridge was understoodfurther.