Flange buckling behavior of girders with corrugated web Part II: Numerical study and design method development

The effect of welding residual stress on the buckling behavior of storage tanks subjected to the harmonic settlement was simulated using the shell-to-solid coupling method. In the numerical model of tanks coupled with the welding residual stress, the welding joint and its adjacent zone were modeled using the solid submodel and the zone far away from the welding joint was built by the shell submodel. Effects of welding parameters (e.g., welding velocities and welding passes) on the buckling behavior of tanks were analyzed systematically. Results indicate that the buckling strength of tanks is enhanced due to the welding residual stress. Comparatively, a slow welding velocity presents a more remarkable strengthening effect than the fast welding velocity due to a larger axial residual stress produced at the welding joint. Nevertheless, no significant difference between the double-side welding and the one-side welding for buckling strength enhancement is observed for the cases studied. This indicates that the current design method causes a conservative design without considering the welding residual stress.

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Test and Numerical Study on the Seismic Performance of A Cable Restrainer for Girder Bridges

IABSE Congress, New York, New York 2019: The Evolving Metropolis ◽

10.2749/newyork.2019.1696 ◽

2019 ◽

Author(s):

Yitong Gu ◽

Wancheng Yuan ◽

Xinzhi Dang

Keyword(s):

Seismic Performance ◽

Numerical Study ◽

Design Method ◽

Lateral Displacement ◽

Static Test ◽

Girder Bridges ◽

Continuous Girder Bridge ◽

Service Conditions ◽

Girder Bridge ◽

Parametric Analyses

<p>In China, most of the support systems applied by short/medium span bridges are elastomeric pad bearings (EPBs). This type of support system has no reliable connections between bearings and girders as well as bearings and piers, which will cause structural damages due to large lateral displacement of bearings under earthquakes. The restrainers used currently could restrict the deformation of bridges under normal service conditions and could only restrict unidirectional displacement. Considering the disadvantages of these restrainers, a new restrainer called Connected Cable Restrainer (CCR), which can be used in short/medium span bridges supported by EPBs, is developed in this paper. The design principle, basic configuration, isolation mechanism and the design method of CCR are introduced. A pseudo static test to study the seismic performance of CCR is conducted. Seismic responses of a 3-span continuous girder bridge with CCR are simulated using OpenSees platform and parametric analyses of the two main parameters, lateral restraining displacement and restraining stiffness, are also carried out. Results show that the deformation of bridges under normal service conditions would not be restrained using CCR and the displacement responses can be mitigated effectively by using CCR through parameter optimization.</p>

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Experimental and numerical study of residual stress distribution of corrugated web I-beams

Journal of Constructional Steel Research ◽

10.1016/j.jcsr.2019.105926 ◽

2020 ◽

Vol 166 ◽

pp. 105926

Author(s):

Zhi-Yu Wang ◽

Tao Zhang ◽

Xiaolei Li

Keyword(s):

Residual Stress ◽

Stress Distribution ◽

Numerical Study ◽

Residual Stress Distribution ◽

Corrugated Web

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A Design Approach for Storage Spar Buoy Platforms in the Concept and Preliminary Design Phases

21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1 ◽

10.1115/omae2002-28544 ◽

2002 ◽

Cited By ~ 2

Author(s):

Richard David Schachter ◽

Carlos Gomes Jordani ◽

Antonio Carlos Fernandes

Keyword(s):

Weight Control ◽

Method Development ◽

Design Method ◽

Design Approach ◽

Preliminary Design ◽

Concept Design ◽

Structural Topology ◽

General Arrangement ◽

Control Stability ◽

Definition Of

The objective of this work is to present a design approach for the Concept and Preliminary Design Phases of Storage SPAR Buoy Platforms and to describe how the design method was developed. The influence of a VIV porosity device on the design is taken into consideration. The inherent advantages of Spar concepts for Petrobras’ applications for 1250 m, are discussed and compared with other concepts. The Spar concept was chosen. The design method development was carried out by means of a brainstorming process, using sketches and the creation of interactive flowcharts of the design processes (similar to a design spiral) comprising the main design factors, their sequencing and interrelations, for both the Concept and Preliminary Design phases. The intent of the design approach is to provide the designer with means to define quick and efficiently the optimal hull dimensions for a pre-established scenario. For the Concept Design, the method includes the definition of the main dimensions, the Wellbay, the structural topology and compartmentation, general arrangement, weight control, stability (intact, damaged and flooded), motions and mooring. A discussion on the influence of the VIV porosity device on the dimensioning and mooring of the Spar Platform is provided. A concept design application example is presented.

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Failure Characteristics of Joint Bolts in Shield Tunnels Subjected to Impact Loads from a Derailed Train

Shock and Vibration ◽

10.1155/2017/2829783 ◽

2017 ◽

Vol 2017 ◽

pp. 1-17 ◽

Cited By ~ 3

Author(s):

Qixiang Yan ◽

Zhixin Deng ◽

Yanyang Zhang ◽

Wenbo Yang

Keyword(s):

Impact Load ◽

Numerical Study ◽

Design Method ◽

Shield Tunnel ◽

Failure Behavior ◽

Impact Loads ◽

Fe Model ◽

Fe Modelling ◽

Bolt Failure ◽

The Impact

Impact loads generated by derailed trains can be extremely high, especially in the case of heavy trains running at high speeds, which usually cause significant safety issues to the rail infrastructures. In shield tunnels, such impact loads may not only cause the damage and deformation of concrete segments, but also lead to the failure of segmental joint bolts. This paper presents a numerical study on the failure behavior of segmental joint bolts in the shield tunnel under impact loading resulting from train derailments. A three-dimensional (3D) numerical model of a shield tunnel based on the finite element (FE) modelling strategy was established, in which the structural behavior of the segmental joint surfaces and the mechanical behavior of the segmental joint bolts were determined. The numerical results show that the occurrence of bolt failure starts at the joints near the impacted segment and develops along the travel direction of train. An extensive parametric study was subsequently performed and the influences of the bolt failure on the dynamic response of the segment were investigated. In particular, the proposed FE model and the analytical results will be used for optimizing the design method of the shield tunnel in preventing the failure of the joint bolts due to the impact load from a derailed HST.

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