The Research On The Effect Of Oblique Angle On Load-carrying Properties Of Inclined High Piers

Load direction is no longer parallel to the section axial direction is the essentialreason of the difference between oblique pier and orthogonal pier which section's axisof symmetry is principal axis. reflect the nature of the key and the only parameters isthe oblique Angle. the section bending stiffness, the normal stress, bending shearstress of the orthogonal pier was expanded to the oblique Angle under taking skewAngle as analysis parameters This paper will of the bridge to method trick the theory,and established entity finite element model analysis of piers linear elastic deformationand the effect on the stability based on the actual engineering. specific researchcontent and the results are as follows:1. Based on the theory of inertia and shaft formula oblique Angle was introduced bythe bridge pier solution formula to cross section, it is concluded that the obliquepier stiffness of cross-section was increased relative to orthogonal pier, bendingfavorable to bridge pier. For a real bridge pier on the oblique inertia computationsection, the above conclusion validated.2. The formula of the oblique pier's bending normal stress which is expressed by theprincipal moment of inertia, oblique angle, point coordinate of principal axiscoordinate system based on the beam bending normal stress formulas was deduced.The relation of section neutral axis's location and skew angle under the action ofbending moment which is along the direction of the bridge was got. The bendingnormal stress of one point in principal axis coordinate system changing with thechange of oblique angle and presence of extreme value were found under the stressformula derivation of oblique angle.The oblique angle of this point corresponding tothe maximum stress is only relation with the ratio of the x-coordinate to y-coordinateof the point in principal axis coordinate system. Further analysis indicated that theapex of maximum bending stress of rectangular oblique Pier (including hollow pier)has the most adverse Oblique angle. The angle's analytical expression of rectangularsolid pier and hollow pier are respectively obtained For the establishment of the finiteelement models for the calculation of bending normal stress, the conclusions areverified.3. vertical shear stress of the hollow rectangular section pier formula was deducedwhen shear force in the short side of the rectangular section Based on simplifiedtheory of the bending stress, and the form of the shear stress flowing was drawed,horizontal shear stress of the short side was further deduced by useing twoassumptions in short side section based on the hollow rectangular pier for thin onboth sides,the value that is very small, calculation can be ignored. in deducingprocess,the concept of D-value of the area static moment axial force was definedrectangular oblique pier under the axial shear, will be broken down into two shearaxial direction force,cut stress distribution was not fit with their two assumptionswhen axial force in long side, so under unaxial shear, the distribution of the stress ofrectangular oblique pier can't be simply deduced by mechanics that balance, but to thethin-wall rectangular hollow pier, the wall thickness is very small, two assumptionscan be used in stress of the thickness of the section stress, so mechanical balance canbe used in the distribution of the shear stress of the rectangular hollow oblique pierwait long side direction's force, so for rectangular hollow oblique pier,decomposethe shear force,let their income cut stress flow stack. the QiYuanDian andZhongJieDian of shear stress was defined in this paper,the rectangular hollow piershear flow can be described by findind out the two o 'clock position, to hollowthin-wall rectangular pier, when oblique Angle for45degrees (that is, two componentequal) QiYuanDian and ZhongJieDian in the long side. When both sides equal, twopoints in the vertex place.4. The conclusion which buckling characteristic value increased with the increase ofoblique Angle was got by the analysis of oblique Angle's effect on high piers ofdeformation and stability of linear elastic,Through water bridge inclined high piersstepped the parameter variations and entity finite element model calculation.