Abstract
The model tuning through sensitivity analysis is a prominent procedure to assess the structural behavior and dynamic characteristics of cable-stayed bridges. Most of the previous sensitivity-based model tuning methods are automatic iterative processes; however, the results of recent studies show that the most reasonable results are achievable by applying the manual methods to update the analytical model of cable-stayed bridges. This paper presents a model updating algorithm for highly redundant cable-stayed bridges that can be used as an iterative manual procedure. The updating parameters are selected through the sensitivity analysis which helps to better understand the structural behavior of the bridge. The finite element model of Tatara Bridge is considered for the numerical studies. The results of the simulations indicate the efficiency and applicability of the presented manual tuning method for updating the finite element model of cable-stayed bridges. The new aspects regarding effective material and structural parameters and model tuning procedure presented in this paper will be useful for analyzing and model updating of cable-stayed bridges.
Highlights
In the past decade the construction of cable-stayed bridges has increased and their span lengths are growing due to improvements in design and analysis technologies
The following properties are considered to investigate the sensitivity of the modal responses of the bridge: (i) Young’s modulus, self-weight, and section properties of steel girders (Ed1, ρd1, Ad1, Ixx(d1), Izz(d1), Iyy(d1)) and prestressed concrete (PC) girders (Ed2, ρd2, A d2, Ixx(d2), Izz(d2), Iyy(d2)); 2P T.P.+226.000
A manual updating algorithm is presented in this paper for model tuning of highly redundant cable-stayed bridges based on sensitivity analysis
Summary
In the past decade the construction of cable-stayed bridges has increased and their span lengths are growing due to improvements in design and analysis technologies. Many experimental and analytical investigations have studied effective factors on the dynamic behavior of cable-stayed bridges, such as natural periods, mode shapes, and damping properties [1,2,3,4,5]. Benedettini and Gentile [19] investigated the sensitivity of the natural frequencies to changes in uncertain parameters of a cable-stayed bridge in Italy with a 70 m main span through a manual sensitivity analysis. The application of the manual sensitivitybased model updating technology to long-span cable-stayed bridges is still a challenge to the civil engineering community. The sensitivity analysis is applied to identify the effect of different parameters on dynamic characteristics of the bridge, which provides a better understanding of the nature of the structural behavior of highly redundant cablestayed bridges. The new and important aspects of this study can be useful as a guide for the analysis and model updating of long-span cable-stayed bridges
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