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Structural Robustness of Long-Span Cable-Supported Bridges.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structural Robustness of Long-Span Cable-Supported Bridges./
Author:	Chen, Qian.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	245 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-01, Section: A.
Contained By:	Dissertations Abstracts International83-01A.
Subject:	Civil engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28543123
ISBN:	9798534693393

Structural Robustness of Long-Span Cable-Supported Bridges.
Chen, Qian.

Structural Robustness of Long-Span Cable-Supported Bridges. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 245 p.

Source: Dissertations Abstracts International, Volume: 83-01, Section: A.

Thesis (Ph.D.)--The City College of New York, 2021.

This item must not be sold to any third party vendors.

As a critical part of the current infrastructure system, long-span bridges are directly exposed to adverse environments, such as floods, scours, hurricanes, etc., and dynamic loads such as earthquakes and vehicular impacts. Additionally, recent long-span cable-supported collapse examples show that many bridges suffered progressive collapse when local damage occurred, and they are highly vulnerable to severe damages in the event of a localized failure. However, the traditional design approaches are unable to provide explicit measures of residual safety of bridges, especially after an abnormal event. Currently available redundancy and robustness evaluation approaches, which were developed mainly for short-span bridges, are inappropriate for long-span cable-supported bridges. Therefore, a new performance-based approach has been developed in this dissertation to quantitatively evaluate the redundancy and robustness of long-span cable-supported bridges subjected to different damage initiating hazards. The ultimate behavior of long-span cable-supported bridges subject to single or multiple member failure has also been investigated. First, two different types of cable-supported bridges, cable-stayed and suspended tied-arch, were selected as example bridges for structural robustness analysis and progressive collapse behavior investigation. Detailed finite element models of these bridges, including explicit models in the LS-DYNA as well as implicit models in other software such as Midas Civil and SAP 2000, were developed. Behavior of these bridges under different single member loss scenarios has been investigated based on the explicit LS-DYNA models. Four indexes, demand capacity ratio (DCR), dynamic increase factor (DIF), static increase factor (SIF) and dynamic amplification factor (DAF), have been introduced. The progressive collapse behavior of these bridges was studied by successively removing members until system failure occurred. The bridge behavior subjected to overloading was examined through pushdown analysis for these bridges in intact and as well as damaged states with single cable loss to identify critical limit states. Subsequently, a new performance-based robustness evaluation method and robustness indexes for bridges, especially for long-span bridges, has been proposed. This method has also been verified for short-span bridges. Both reliability and robustness of the two long-span bridges were quantitatively evaluated using this approach for the limit states identified through the pushdown analysis. The result show that: (1) the effect of various scenarios of single cable loss on each bridge can be captured explicitly, demonstrating the applicability of the robustness evaluation method and the proposed robustness index, especially for long-span bridges, and (2) in spite of the adverse effect of single cable loss, there was no significant reduction on the reliability and robustness in both the two long-span bridges, i.e., they are very robust against any single cable loss scenario.

ISBN: 9798534693393Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Cable-stayed bridge

Structural Robustness of Long-Span Cable-Supported Bridges.
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300 $a 245 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-01, Section: A.
500 $a Advisor: Agrawal, Anil K.
502 $a Thesis (Ph.D.)--The City College of New York, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a As a critical part of the current infrastructure system, long-span bridges are directly exposed to adverse environments, such as floods, scours, hurricanes, etc., and dynamic loads such as earthquakes and vehicular impacts. Additionally, recent long-span cable-supported collapse examples show that many bridges suffered progressive collapse when local damage occurred, and they are highly vulnerable to severe damages in the event of a localized failure. However, the traditional design approaches are unable to provide explicit measures of residual safety of bridges, especially after an abnormal event. Currently available redundancy and robustness evaluation approaches, which were developed mainly for short-span bridges, are inappropriate for long-span cable-supported bridges. Therefore, a new performance-based approach has been developed in this dissertation to quantitatively evaluate the redundancy and robustness of long-span cable-supported bridges subjected to different damage initiating hazards. The ultimate behavior of long-span cable-supported bridges subject to single or multiple member failure has also been investigated. First, two different types of cable-supported bridges, cable-stayed and suspended tied-arch, were selected as example bridges for structural robustness analysis and progressive collapse behavior investigation. Detailed finite element models of these bridges, including explicit models in the LS-DYNA as well as implicit models in other software such as Midas Civil and SAP 2000, were developed. Behavior of these bridges under different single member loss scenarios has been investigated based on the explicit LS-DYNA models. Four indexes, demand capacity ratio (DCR), dynamic increase factor (DIF), static increase factor (SIF) and dynamic amplification factor (DAF), have been introduced. The progressive collapse behavior of these bridges was studied by successively removing members until system failure occurred. The bridge behavior subjected to overloading was examined through pushdown analysis for these bridges in intact and as well as damaged states with single cable loss to identify critical limit states. Subsequently, a new performance-based robustness evaluation method and robustness indexes for bridges, especially for long-span bridges, has been proposed. This method has also been verified for short-span bridges. Both reliability and robustness of the two long-span bridges were quantitatively evaluated using this approach for the limit states identified through the pushdown analysis. The result show that: (1) the effect of various scenarios of single cable loss on each bridge can be captured explicitly, demonstrating the applicability of the robustness evaluation method and the proposed robustness index, especially for long-span bridges, and (2) in spite of the adverse effect of single cable loss, there was no significant reduction on the reliability and robustness in both the two long-span bridges, i.e., they are very robust against any single cable loss scenario.
590 $a School code: 1606.
650 4 $a Civil engineering. $3 860360
650 4 $a Engineering. $3 586835
650 4 $a Structural engineering. $3 661234
650 4 $a Bridges. $3 868720
650 4 $a Mechanical engineering. $3 649730
650 4 $a Load. $3 3562902
650 4 $a Simulation. $3 644748
650 4 $a Construction. $3 3561054
650 4 $a Failure. $3 3561225
650 4 $a Cables. $3 851074
650 4 $a Random variables. $3 646291
650 4 $a Concrete. $3 666349
650 4 $a Metal fatigue. $3 3681450
650 4 $a Roads & highways. $3 3555163
650 4 $a Automobile safety. $3 3681451
650 4 $a Design. $3 518875
650 4 $a Stress concentration. $3 747123
650 4 $a Building codes. $3 3681452
650 4 $a Corrosion. $3 3595443
653 $a Cable-stayed bridge
653 $a Progressive collapse
653 $a Redundancy
653 $a Reliability
653 $a Structural robustness
653 $a Tied-arch bridge
690 $a 0543
690 $a 0537
690 $a 0548
690 $a 0389
710 2 $a The City College of New York. $b Civil Engineering. $3 3183726
773 0 $t Dissertations Abstracts International $g 83-01A.
790 $a 1606
791 $a Ph.D.
792 $a 2021
793 $a English
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