Abstract

Info

Title:: Optimization of load efficiency coefficient of selfanchoredsuspension bridge based on method of robust regression

Author(s):: WU Fangwen; LUO Jianfei; ZHENG Wei; DAI Jun; CAI Cheng; WEN Yajun; （School of Highway， Changan University， Xian 710064， Shaanxi, China)

Keywords:: bridge engineering; load efficiency coefficient; robust regression; selfanchored suspension bridge; load test

PACS:: -

DOI:: -

Abstract:: In order to explore the unreasonable value of load efficiency coefficient of selfanchored suspension bridges, the Baishi Bridge in Zhuhai City was studied, and the load efficiency coefficient of selfanchored suspension bridges were optimized by the method of robust regression. The relationship between the structural response and the load efficiency coefficient of the main girder and the main tower of the selfanchored suspension bridge was studied in detail. And the reasonable value of load efficiency coefficient was determined. Firstly, based on the field test of Baishi Bridge, the response values of the main beam and main tower under graded loading were obtained. Secondly, the linear robust regression model between load efficiency coefficient and structural response was established by using MATLAB, and the reliability of the mathematical model was analyzed. Then, the robust regression model was used to predict and analyze the structural response (deflection, stress and deflection of cable tower) under the load efficiency coefficient required by the code. The load efficiency coefficient with the smallest error value was taken as the final optimization value. Finally, the above research results were verified based on the field test data of the other two selfanchored suspension bridges with the same structural form. The results show that the predicted value of structural response obtained by the proposed robust regression analysis method is in good agreement with the test value, and the load efficiency coefficient of the main components of selfanchored suspension bridge can be optimized effectively. When the load efficiency coefficient of the main beam of the selfanchored suspension bridge is less than 0.68, and the offset load efficiency coefficient of the main tower is less than 0.82, the structural response of the selfanchored suspension bridge varies linearly. When the load efficiency coefficient of the main beam is 0.68, the relative error between the predicted value and the measured value of the structural response can be controlled within 3%. When the partial load efficiency coefficient of the tower is 0.82, the relative error between the predicted value and the measured value can also be controlled within the allowable range, that is, the offset load efficiency coefficient of the main beam and tower of the selfanchored suspension bridge should be optimized to 0.68 and 0.82 respectively. This method can provide a support for a quick evaluation of selfanchored suspension bridge and provide a certain reference basis for the subsequent improvement of relevant specifications. 7 tabs, 12 figs, 25 refs.

Optimization of load efficiency coefficient of selfanchoredsuspension bridge based on method of robust regression

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Info

References:

Memo

Common functions

Navigate

Tools

Statistics