Study On The Horizontal Force Distribution And Transfer Rule Of Framework Wharf Bent

With the Yangtze River shipping become more and more important in our country,inland framework wharfs plays a huge role in the strategy of "Rely on the golden waterway to construct the Yangtze River economic belt".This article,which is based on Orchard Wharf of Chongqing Port stage ? works.This project comes from Subject 4 called" Key Technology Research on the shipping of the Three Gorges Reservoir"(2012BAB05B04),which is the national" 12th Five-Year Plan about "key technology in development of shipping in the upstream of the Yangtze River".large scale model test and numerical simulation are adopted to study distribution and transfer laws of the horizontal force in inland rock socketed steel pipe piles frame pier transverse of framework wharf transverse bent.Specifically,the main research work and research result of this paper includes the following aspects:(1)The distribution coefficient of the horizontal force on the wharf bent was obtained through large scale framework wharf model test by using the algorithm of simplified elastic foundation rigid beam.With the comparison to Design and Construction Code for Open Type Wharf on Piles(JTS 167-1-2010),inland framework has the same regularity as coastal piled wharf on horizontal force distribution.Because the height of wharf frame structure is large.When the horizontal force acting on the lowest ethers layer,the displacement of bent vertex is the minimum,structure relative overall stiffness is the biggest and the distribution coefficient of horizontal force on the stress bent is most concentrated.Due to the difference rigidity of lower contact brace,which also cause most concentrated distribution coefficient when the horizontal force acting on the bottom of the side span.The value of maximum distribution coefficient is 0.505.Therefore,the most unfavorable load is selected when simplify the horizontal force to the plane bent.Horizontal force could be selected 0.505 times of the actual stress.(2)Through the analysis of test results and numerical calculation results,contrast the structural deformation of the other components on the wharf structure,the change of strain in pile foundation is the most obvious.Significant mutation on the strain curve at the longitudinal and horizontal brace,it is proved that longitudinal and horizontal bracings not only can improve overall stiffness of the wharf structure,but also make transfer pathway of the internal forces from single transfer of beam to common transfer of transverse member.(3)According to the statically indeterminate structure follow the "principle of strong"and "principle of proximity" in the force distribution,the horizontal force mainly through adjacent to the transverse member to pile foundation:when the ship impact force acting on the high or medium water level,the horizontal force is transferred to the pile foundation through beams and contact braces;the effect in the low water level,the horizontal force is transferred to the pile foundation through steel braces;in addition to the transverse member,horizontal force transmission also can through the contact braces(longitudinal braces)between the stress frame and adjacent frame to the adjacent frame,it can make the structure to bear the horizontal force.(4)By the energy flow theory,the strain of the structure member can be as the judgment standard,led to the main transfer path of the horizontal force in frame wharf:with the position of horizontal force downward,the maximum strain of pile foundation can transfer from the back to the front of pile foundation;when the horizontal force acting on the high water,the main transfer path of the horizontal force is the force component--the transverse member adjacent--the back row pile;when the horizontal force acting on the low water level,the main transfer path of the horizontal force is the force component--the transverse member adjacent--the front row pile.