Mechanical performance of the negative bending moment zone at the top of continuous beam bridge piers under complex constraints
ZHANG Chengming
ZHOU Guotao
ZHANG Jingquan
LI Mengke
SONG Tao
Abstract：To investigate the mechanical properties of the negative bending moment zone(NBMZ)at the pier top of a simply supported to continuous girder,the deformation coordination condition is taken as the continuous rotation angle at the pier top fulcrum.The analytical expression of the restraint bending moment in the NBMZ at the pier top is derived using bilinear method(BM)and age-adjusted effective modulus(AAEM)method.Theoretical analysis are carried out.The results of the proposed method are compared with that of the field experiments and Portland Cement Association(PCA)method and Construction Technology Laboratories(CTL)method.The research results indicate that the tensioning of prestressed reinforcement has the greatest impact on the negative bending moment zone at the pier top during the process of simple supported to continuous girder;The values of the proposed method are in good agreement with the measured experimental values and PCA method and CTL method.This indicates the proposed method BM-AAEM has the high accuracy,which can preliminarily estimate whether there is a risk of cracking in the NBMZ at the top of the pier.
Keywords：simply supported continuous beamnegative bending moment zoneconstraint bending momentbilinear methodage-adjusted effective modulus of elasticity method
Publication Date：2026-01-31
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 55-62 )