Investigation of Abutment Displacement of a Full Height Integral Bridges in Dense Granule Backfill | Science Publications

American Journal of Engineering and Applied Sciences

A. R.K. Rashid¹  M. H. Alizadeh¹  Zamri Chik¹  S. M. Mirhosseiny¹ 

关键词: Bridge deck elongation;    passive soil pressure;    finite element model;   

DOI  :  10.3844/ajeassp.2010.749.756

学科分类：工程和技术（综合）

来源: Science Publications

【 摘 要 】

Problem statement: In this study, the behavior of abutment wall in full height frameintegral abutment bridges was investigated. It was seen that the effect of backfill soil resistance onbehavior of abutment wall movement is mostly neglected in previous studies. In this research, the finalbridge superstructure displacement under temperature-induced forces was formulated. In addition,according to the final bridge displacement, the earth pressure that acts as a resistant force on the bridgeabutment using the new equation from British design manual for roads and bridges, BA 42/96 wasused. Besides, in the construction of integral bridges, the deck and girders are mostly encased intoabutment wall, which makes these bridge components as fixed elements. This fix connectivity makesthe top abutment wall move along with the bridge deck. Moreover, the abutment wall in integralbridges is made of reinforced concrete and thus, it could be assumed as a rigid mass that has a lineardeformation behavior. Approach: To implement a new method to calculate the amount of abutmentwall movement at different elevations in full height frame abutment integral bridges, considering theparameters such as temperature changes, bridge deck elongation and the backfill soil resistance. First,internal forces of the bridge abutment were formulated. They were all presented as functions of bridgedeck final displacement. Second, different methods to calculate the soil lateral pressure were used.Third, the numerical modeling was applied and the corresponding results due to the bridge deckelongation were extracted. Fourth, the results obtained from phases two and three were compared toobtain some conclusion. Results: The results derived in this study, consisted of four data sets. First, theexisting forces such as the bridge deck elongation force, the backfill soil resistance etc. wereformulated according to the bridge final displacement. Then after, the static principals revealed theamount of deck final elongation. For the second set, different correlations such as British Standard,Massachusetts manual and etc. which had considered the effect of deck final displacement in theirformulas were presented and with regard to the first part, the backfill reactions were obtained. For thethird set, by combining the results from set one and two, different values for the deck finaldisplacement were derived. For the next step, according to the fix connectivity of the abutment and thebridge deck, the abutment top elevation displacement was set equal to the deck final displacement. Forthe bottom elevation, because of the rigidity of the wall and the rotational behavior about itsfoundation, the displacement was set zero. Therefore, by assuming linear deformation behavior of rigidmasses, the abutment deformation profile for different elevations was concluded. For the last set, thebridge computer model was built using SAP2000 and the corresponding results were collected.Conclusion: It was seen that, generally, except for some certain cases, all the used correlations in thisstudy were in a close agreement either with each other or with the Finite Element data. BritishStandard method had the closest results to the finite element data and thus preferably it isrecommended while the others not denied.

【 授权许可】

Unknown