Response Surface‐Based Finite Element Model Updating of Steel Box‐Girder Bridges with Concrete Composite Decks

Abstract

The orthotropic steel deck (OSD) using the steel-steel fiber reinforced concrete (SFRC) deck can be used in small and medium-span bridges for its advantages of construction convenience and lower construction cost. The seismic performance of THESE steel box girder bridges in strong earthquake zones needs to be evaluated, and a reasonable finite element model is the important basis for an accurate evaluation of these bridges. Finite element analysis (FEA) and field measurements of the dynamic characteristics of steel box girder bridges were carried out in this study, and the finite element model was updated based on the response surface method. The studies show that the bridge modal parameters can be reasonably identified based on the measurements of the bridge under ambient excitation without artificial excitation; the first six orders of mode shapes in the FEA results are consistent with the measured ones, but there is a difference between the natural frequencies; the model updating found that the elasticity modulus, density, and thickness of the SFRC have some influence on the first six orders of natural frequency of the bridge, but the SFRC thickness has the most significant influence on the bridge frequency, and the influence of epoxy asphalt pavement on bridge frequency is small. The study concluded that the SFRC layer of the bridge deck is no longer the traditional bridge deck pavement without considering the stiffness, but it integrates with the OSD as a steel-concrete composite structure. Therefore, the structure formed by the SFRC layer through the combination of shear studs and OSD shall be reasonably simulated in the finite element model so as to reasonably reflect the contribution of the SFRC layer in the composite structure of the bridge stiffness. The obtained updated finite element model gives results closer to the measured modalities, which provides a more reasonable bridge model for seismic analysis of bridges located in strong seismic zones and also demonstrates the effectiveness of the finite element analysis and the model updating method based on the response surface method in this study.

Finite Element Analysis of Normal and Dysplastic Hip Joints in Children

“…These results were then used as boundary and load settings for the hip joint finite element analysis. The study found that hip joint contact stress varied throughout the gait cycle, providing valuable insights into the biomechanics of the hip joint during walking [8].…”

“…The cartilage contact area and stress distribution across the articular components can be calculated. The aim of this study was to compare the biomechanical characteristics between a normal hip and a dysplastic hip in children [6][7][8][9].…”

A Review on Behavior and Fatigue Performance of Orthotropic Steel–UHPC Composite Deck

“…The results showed that the steel-UHPC composite deck could effectively increase the fatigue reliability of fatigue-prone details and extended the fatigue life, and an increase in UHPC layer thickness could increase the fatigue life of the composite deck system. Zhu [86,87] built a steel-box girder model with the OSD stiffened by the UHPC, and the hot-spot stress was employed to obtain refined results from submodels. They compared the results with field measurements.…”

“…When the spacing of shear studs was 250 mm, although the shear stress range in the headed studs reached 119 MPa, no fatigue damage was found after 200 million cyclic loadings. In Chen's [87] fatigue model test of the steel-UHPC composite deck. They reported shear connection failure under cyclic fatigue loading, which appeared in delamination at the interface between the UHPC layer and the steel deck plate.…”

Compendio de metodologías sobre efectos sísmicos para diseño de puentes atirantados, colgantes y en arco

“…El comportamiento sísmico de los puentes varía seg ún su dise ño (Chenchen et al ,2023). Puentes bien equilibrados y dise ñados son más fáciles de proteger contra terremotos (Yong et al ,2022), pero estructuras no estándares pueden ser más vulnerables y pueden necesitar análisis detallados (Cheng-Qi et al ,2022). Por ejemplo, el Puente de la Bahía de San Francisco-Oakland sufri ó da ños en el terremoto de Loma Prieta en 1989 (Chen & Duan ,2014).…”