scholarly journals Experimental Study of Environmental Conditions on In-Situ Engineered Cementitious Composites-Steel Deck Interface

2020 ◽  
Vol 10 (6) ◽  
pp. 2123 ◽  
Author(s):  
Shuyin Wu ◽  
Xiaoyin Sun ◽  
Jun Yang ◽  
Ruochong Yang ◽  
Jipeng Zhu
Keyword(s):  
Interfacial Strength ◽  
Epoxy Adhesive ◽  
Interface Failure ◽  
Hydrothermal Aging ◽  
Long Span Bridges ◽  
Freeze Thaw ◽  
Long Span ◽  
Bonding Technology ◽  
Combined Action ◽  
Steel Deck

In this study, engineered cementitious composite (ECC) was used as a deck paving for long-span bridges. The feasibility of using an epoxy adhesive to achieve wet-bonding between a steel deck and cast-in-place ECC was evaluated. The shear and pull-off tests were conducted to evaluate the effects of freeze-thaw cycles and hydrothermal aging on interfacial properties. The test results indicate that the interfacial strength decreases with an increase in the number of freeze-thaw cycles and the duration of hydrothermal aging. Based on an inclined shear test, a criterion for interface failure under the combined action of shear and compression is also proposed. Wet-bonding technology might promote the application of ECC in the surfacing system for orthotropic steel deck bridge and further extend the service life of a bridge structure.

Feasibility study of wind tunnel aeroelastic tests on bridges with floating towers

2019 ◽  
Author(s):  
Tommaso Argentini ◽  
Claudio Montagna ◽  
Daniele Rocchi
Keyword(s):  
Wind Tunnel ◽  
Feasibility Study ◽  
Experimental Validation ◽  
Numerical Models ◽  
Design Solution ◽  
Long Span Bridges ◽  
Long Span ◽  
Actuation System ◽  
Floating Offshore Wind Turbines ◽  
Combined Action

<p>Floating towers are an innovative design solution for long-span bridges crossing deep waters, where grounded towers are not applicable. This kind of structural solution brings about challenging issues related to the design of such structures exposed to the combined action of aerodynamic forces and hydrodynamic forces. One of the major issues is the experimental validation of numerical models to simulate the structural dynamics, based on hybrid codes joining aero-elastic and hydro-elastic interactions.</p><p>This paper presents a feasibility study of wind-tunnel aeroelastic tests, where the submerged part of the bridge is simulated by Hardware-In-the-Loop (HIL) technology: actuators simulates the motion of the floater due to the combined action of the hydrodynamic loads on the floater (numerically simulated in real time) and of the aerodynamic and inertial loads transmitted by the tower (measured by a 6-components dynamometer). A similar HIL testing device has been developed at POLIMI in the field of floating offshore wind turbines, and it is likely to be applied to long-span bridges, as a tool for the experimental validation of complex numerical hybrid approaches.</p><p>The opportunities offered by this technology will be discussed in the paper, working out a numerical example where the full-scale response of a FEM of the full-bridge is simulated and then it is scaled in order to assess the feasibility of aeroelastic tests in wind tunnel, with a focus on the characteristics of the actuation system for the tower base: necessary of degrees of freedom, amplitude and bandwidth of motion and force.</p>

Standardization and Optimization of Orthotropic steel deck with Numerical modelling

2019 ◽  
Author(s):  
Nouman Iqbal ◽  
Heng Fang ◽  
Gilles Van Staen ◽  
Ahsan Naseem ◽  
Hans De Backer
Keyword(s):  
Numerical Simulation ◽  
Direct Contact ◽  
Complex Structure ◽  
Labor Cost ◽  
Orthotropic Steel Deck ◽  
Long Span Bridges ◽  
Long Span ◽  
Stress Relieving ◽  
Fatigue Endurance ◽  
Steel Deck

<p>In this paper, standardization and optimization of Orthotropic Steel Deck (OSD) is carried out to increase its usage as an essential bridge component. OSD’s are more often used in the long span bridges because they considered expensive and more complex structure. There are fatigue crack complications associated with these type of steel decks due to their direct contact with the heavy cyclic loading. The idea of standardizing the OSD’s is floating in the research industry for last two decades. To facilitate this concept numerical simulation study is carried out with and without additional cutouts with different deck thicknesses and span lengths. The Cross beams without stress relieving cutouts have been introduced which will reduce the labor cost for special cutouts preparation and increase the fatigue endurance of critical welded joints. Based on these numerical results; recommendations have been made. Standardization and optimization of OSD’s will definitely increase their usage in bridges.</p>

Alternate Designs for Long Span Bridges

PCI Journal ◽  
1980 ◽  
Vol 25 (4) ◽  
pp. 48-58
Author(s):  
Felix Kulka
Keyword(s):  
Long Span Bridges ◽  
Long Span

Wind Buffeting in Time Domain Analysis of Long-Span Bridges using RM Bridge

2017 ◽  
Vol 109 (6) ◽  
pp. 3307-3317
Author(s):  
Afshin Hatami ◽  
Rakesh Pathak ◽  
Shri Bhide
Keyword(s):  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Long Span Bridges ◽  
Long Span

scholarly journals Current and New Approaches to Predict the Deflections of One-Way Flexural Members with a Focus on Composite Steel Deck Slabs Voided by Circular Tubes

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 421
Author(s):  
Chang-Hwan Lee ◽  
Iman Mansouri ◽  
Jaehoon Bae ◽  
Jaeho Ryu
Keyword(s):  
Structural Function ◽  
Flexural Members ◽  
Long Span ◽  
Deck Slabs ◽  
New Type ◽  
New Perspective ◽  
Flexural Tests ◽  
Prediction Approach ◽  
Steel Deck

A new type of composite voided slab, the TUBEDECK (TD), which utilizes the structural function of profiled steel decks, has recently been proposed. Previous studies have confirmed that the flexural strength of TD slabs can be calculated based on the full composite contribution of the steel deck, but for long-span flexural members, the deflection serviceability requirement is often dominant. Herein, we derived a novel deflection prediction approach using the results of flexural tests on slab specimens, focusing on TD slabs. First, deflection prediction based on modifications of the current code was proposed. Results revealed that TD slabs exhibited smaller long-term deflections and at least 10% longer maximum span lengths than solid slabs, indicating their greater efficiency. Second, a novel rational method was derived for predicting deflections without computing the effective moment of inertia. The ultimate deflections predicted by the proposed method correlated closely with the deflection under maximum bending moments. To calculate immediate deflections, variation functions for the concrete strain at the extreme compression fiber and neutral axis depth were assumed with predictions in good agreement with experiments. The proposed procedure has important implications in highlighting a new perspective on the deflection prediction of reinforced concrete and composite flexural members.

scholarly journals Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

2021 ◽  
Vol 11 (4) ◽  
pp. 1642
Author(s):  
Yuxiang Zhang ◽  
Philip Cardiff ◽  
Jennifer Keenahan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Tunnel ◽  
Careful Analysis ◽  
Wind Effects ◽  
Wind Tunnel Tests ◽  
Long Span Bridges ◽  
Long Span ◽  
Comparative Review ◽  
Dynamics Modelling

Engineers, architects, planners and designers must carefully consider the effects of wind in their work. Due to their slender and flexible nature, long-span bridges can often experience vibrations due to the wind, and so the careful analysis of wind effects is paramount. Traditionally, wind tunnel tests have been the preferred method of conducting bridge wind analysis. In recent times, owing to improved computational power, computational fluid dynamics simulations are coming to the fore as viable means of analysing wind effects on bridges. The focus of this paper is on long-span cable-supported bridges. Wind issues in long-span cable-supported bridges can include flutter, vortex-induced vibrations and rain–wind-induced vibrations. This paper presents a state-of-the-art review of research on the use of wind tunnel tests and computational fluid dynamics modelling of these wind issues on long-span bridges.

Sign in / Sign up

Export Citation Format

Share Document