Dissertation > Transportation > Road transport > Bridges and Culverts > Bridges constructed > Pier structure ( substructure ) > Bridge pier

Calculation and Analysis of Horizontal Displacement on the Top of the High Piers and a Comparison about the Pier Type in the Mountain Regions

Author ShiCuiFang
Tutor ZhaoXiaoXing
School Chang'an University
Course Bridge and Tunnel
Keywords the High Piers in the Mountain Regions horizontal displacement Rayleigh-Ritzand energy principle Analytic Hierarchy Process The selection of pier type
CLC U443.22
Type Master's thesis
Year 2013
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With the continuous development of our country mountainous area highway construction,the bridge type selection showed a trend of diversification. Such as Hollow Pier,Solid Pier andvariable sectional area piers and so on. In actual engineering, its mechanical index (mainlypier top horizontal displacement that represent high pier’s stiffness) be the first choice of theselection type pier factor, At the same time should alsotake into account the materialconsumption, construction difficulty and beautiful degreeetc. the bridge type selection is notseen related research And one factor pier top horizontal displacement results in single factorexisting pier top displacement under study it did not form a system, this is the starting point ofthis study. In this paper, throughcollecting a large number of research into the existing18kinds of block type, with different height range for the different type pier pier topdisplacement and researches on the comprehensive comparison method, The mainachievements of this thesis are asfollows:This article mechanics index quantification on the horizontal displacement of high pier,using the principle of potential energy in value derived the horizontal displacement of non-The boundary conditions of high pier, select the shape functions for each type pier isreasonable and suitable mechanical model. Found the reasonable shape function that thin-wallpier, variable sectional area piers, single column pier and double cylindrical piers, calculatedhorizontal displacement of the different section size pier with that Formula, compare with thedate from finite element method, the comparative error is found within9.904%of each piertype, therefore, this article selected shape function is more accurate.This article main pier type selection of mountain expressway and summarized research,different type commonly used pier height range, on the basis of the research conclusion,through four factors that mechanics index, cost, construction methods, beautiful to chooseoptimal pier model, using AHP method to determine the various factors when choosing abridge cross section type of weight vector A={mechanics index, The number of materials,construction methods, beautiful}={0.43,0.31,0.22,0.04}.By each rank the comprehensivescores of all factors, the selection of pier type is as follows:When the pier’s high is in therange of20meters, single column pier and double cylindrical piers are superior than others,When the pier’s high is30meters, single column pier is best. When the pier’s high is40meters,the first choice is single column pier that section size is D240and D260. When thepier’s high is50meters, the first choice is variable sectional area piers.When the pier’s high is60meters, the variable sectional area piers of (180、220、260、300)cm×200cm are superior than thin-wall pier.When the pier’s high is70meters, the thin-wall pier that section size is300×600cm and wall thickness is50cm is obvious advantages than others.When the pier’shigh is80meters, the first choice is the thin-wall pier that section size are350×600cm and thewallthickness are all50cm.When the pier’s high is from90to100meters, the thin-wall pierthat section size is400×650cm and wall thickness is60cm is obvious advantagesthan othersor using the larger section size thin-wall pier. In this paper, research results canprovidereference for design and bridge pier’s selection in mountain regions.

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