Parametric study of the radiative load distribution on the EU-DEMO first wall due to SPI-mitigated disruptions

This paper presents the live load distribution in straight prestressed concrete (PSC) girder bridges with curved deck slab utilizing finite element analyses. Numerical modeling methodology was established and calibrated based on field testing results. A parametric study of 73 cases with varying 6 critical parameters was used to determine a trend over each parameter. Through live load girder distribution factor (GDF) comparisons between the AASHTO LRFD, AASHTO Standard factors and finite element analyses results, both AASHTO live load distribution predicted conservatively in most bridges considered in the parametric study. However, in the bridges with curved slab, GDF was underestimated due to curvature influences. This study proposes a new live load distribution formula to predict rational and conservative live load distribution in PSC girder bridges with curved slab for a preliminary design purpose. The proposed live load distribution provides better live load analysis for the PSC girder bridge with curved slab and ensures the GDF is not underestimated.

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Parametric Study on the Influence of Bays Number and Frame-Span Length on the Redundancy Indices of Reinforced Concrete Structures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.845.259 ◽

2016 ◽

Vol 845 ◽

pp. 259-264

Author(s):

Mutiara Puspahati Cripstyani ◽

Stefanus Adi Kristiawan ◽

Edy Purwanto

Keyword(s):

Reinforced Concrete ◽

Parametric Study ◽

Load Distribution ◽

Three Dimensional ◽

Alternative Possibilities ◽

Span Length ◽

Reinforced Concrete Structure ◽

Strength Index ◽

Capacity Curves ◽

Variation Index

The role of redundancy in a structure that receives earthquake load is very important. It provides alternative possibilities of load distribution in the event of a local collapse of the system before it reaches the total collapse of the structure. This mechanism of load distribution provides time for the users of the building to escape. A parametric study is carried out to investigate the effect of bays number and frame-span length in order to identify factors affecting the redundancy of the reinforced concrete structural system. Non-linear analysis (pushover) using SAP2000 on three-dimensional structural frames system are performed to obtain the capacity curves of the structures from which redundancies are calculated. Redundancy on the system is determined into two redundancy indices i.e. redundancy strength index (rs) and redundancy variation index (rv) which are, respectively, deterministic and probabilistic measure of the stuctural redundancy. This study points out that frame-span length has more significant effect on redundancy indices compared to the bays number. It is also shown that a reinforced concrete structure with a higher redundancy strength index tends to have a lower redundancy variation index.

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Thermal-hydraulic analysis of the First Wall of a CO2 cooled pebble bed breeding blanket for the EU-DEMO

Fusion Engineering and Design ◽

10.1016/j.fusengdes.2018.11.057 ◽

2019 ◽

Vol 138 ◽

pp. 379-394 ◽

Cited By ~ 2

Author(s):

Shuai Wang ◽

Francisco A. Hernández ◽

Hongli Chen ◽

Guangming Zhou

Keyword(s):

Hydraulic Analysis ◽

First Wall ◽

Pebble Bed ◽

Thermal Hydraulic Analysis ◽

The Eu

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Load Distribution Factors for Curved Concrete Slab-on-Steel I-Girder Bridges

10.32920/ryerson.14665275 ◽

2021 ◽

Author(s):

Mohammed A. Al-Hashimy

Keyword(s):

Parametric Study ◽

Load Distribution ◽

Concrete Slab ◽

Steel Bridges ◽

Urban Systems ◽

Lateral Bending ◽

Curved Bridges ◽

Horizontally Curved ◽

Girder Bridges ◽

Curved Steel

The use of complex interchanges in modern highway urban systems have increased recently in addition to the desire to conform to existing terrain; both have led to increase the demand for horizontally curved bridges. One type of curved bridges consists of composite concrete deck over steel I-girders which has been the preferred choice due to its simplicity in fabrication, transportation and erection. Although horizontally curved steel bridges constitute roughly one-third of all steel bridges being erected today, their structural behavior still not well understood. Due to its geometry, simple presence of curvature in curved bridges produces non uniform torsion and consequently, lateral bending moment (warping or bi-moment) in the girder flanges. The presence of the lateral bending moments would significantly complicate the analysis and the design of the structure. Hence, a parametric study is required to scrutinize a simplified method in designing horizontally curved steel I-girder bridges. A parametric study is conducted, using the finite-element analysis software "SAP2000", to examine the key parameters that may influence the load distribution on the curved composite steel girders. Based on the data generated from the parametric study, sets of empirical equations are developed for the moment and shear distribution factors for straight and curved steel I-girder bridges when subjected to the Canadian Highway Bridge Design Code (HCHBDC) truck loading.

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Investigation of Load Distribution Factors for Simply-Supported Composite Multiple Box Girder Bridges

10.32920/ryerson.14651502.v1 ◽

2021 ◽

Author(s):

Siham Kadhim Jawad

Keyword(s):

Finite Element ◽

Parametric Study ◽

Load Distribution ◽

Shear Force ◽

Bending Moment ◽

Box Girder Bridges ◽

Box Girder ◽

Simply Supported ◽

Girder Bridges ◽

Load Distribution Factors

Composite box-girder bridges are recently used in modern highway urban system because of their profitable and structural aptitude advantages. North Americans Codes of Practice specify empirical equations for girder moment and shear forces in such bridges in the form of live load distribution factors. These factors were proven to be conservative in some cases and underestimate the response in other cases. Therefore, an extensive parametric study, using the finite-element modeling, was conducted to examine the key parameters that influence the load distribution factors of such bridges. A total of 276 prototype bridges were analyzed to evaluate girder bending moment, shear force and deflection distribution factors for simply-supported composite multiple box-girder bridges when subjected to CHBDC truck loading. Design parameters considered in this study were bridges span length, numbers of design lanes, number of box girders and girder spacing. Based on the data generated from parametric study, sets of simple empirical expressions were developed for bending moment; shear force and deflection distribution factors for such bridges. A correlation between the finite-element results with CHBDC and AASHTO-LRFD empirical expressions showed the former are more reliable in structural design of composite box-girder bridges.

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