doi:10.16186/j.cnki.1673-9787.2023040040

Received:2023-04-20

Revised:2023-06-16

Online Date:2023-07-12

Design optimization of joint between asymmetric V-shaped steel tower and concretebase for a cable-stayed bridge（Online）

ZHOU Chaoyang1, XIAO Yipeng1, HE Chang1, WANG Xingguo2

1.School of Civil Engineering， Central South University，Changsha  410075，Hunan，China;2.School of Civil Engineering， Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:An asymmetric V-shaped steel structure forms due to the intersection of a tall column and a pillar both inclined at the bottom of the main tower of a special-shaped cable-stayed bridge，and the axis of the steel member is seriously deviated from the vertical line of the top surface of the lower concrete base. Many parameters need to be determined for the scheme of steel-concrete joint selected earlier. Based on the refined nonlinear finite element simulation，the stresses of each component under a variety of typical loading case were analyzed，compared and checked by changing the parameter values. The results show that there are two most critical loading cases，which are the extreme loading case of tensioning 4 cables and the maxi⁃mum sum of the absolute values of in-plane and out-of-plane bending moments.The main tensile stresses ofthe concrete base often plays a controlling role，and the stresses of the tower root were close to the standard limit.Thickening the bearing plate and improving the strength of concrete are beneficial to controlling thestresses of anchor box steel plate and base concrete，but to consider the cost，moderate on the line.In theoriginal scheme，the transverse and vertical steel plate in the middle of the anchor box has little effect.Reasonable arrangement of bolts is far more important than quantity，and prestress applied on the tensile sideunder the action of bending moment can play a beneficial role. The final optimization scheme greatly reduces the number of anchor box steel plates and anchor rods，and the prestress distribution is more appropriate.The research results take into account safety，applicability and economy，and have reference significance for related projects.

Key words:cable-stayed bridge;steel-concrete joint;design optimization;finite element simulation

CLC：U448.27