THE DERIVATION OF ORIGINAL STIFFNESS MATRIX ON THE SPATIAL SOLID- BEAM ELEMENT

ZHOU Hai-long;ZHOU Shui-xing;College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University;Civil Engineering and Architecture College,Chongqing Jiaotong University;

Space solid-beam element;;concrete-filled steel tube;;arch structure;;stif&ieas matrix;;derivation

Based on matrix displacement method for arch structure and fiber element method for concrete-filled steel tube arch bridge,through improving division of section element on arch rib,chose appropriate 8-node shape function,built displacement transfonn matrix and coordinate tiansfonn matrix, simultaneously quoted fiber- element notion, this paper advanced the spatial solid- beam method, analyzed single arch rib circular section concrete- filled steel tube arch structure's internal forces with this method, and deducted this method's sti&ess matrix in detail. At the same time, in order to verify the deduction correct, the author wrote a special program, and calculates the Vault and Springer's internal force of one experiment model arch structure. The calculated result was compared with the analyzed result by matrix displacement method and the computed result by the s^ware of SAP2000,its maxitmim error is at the range of 5%.The calculated results indicate that the derivation of stifGoess matrix on the spatial solid- beam element is correct.