Recherche

Afficher tous les résultats pour

Accueil

Personne

Alain Nussbaumer

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (111)

Page 4 sur 6

On the low-cycle fatigue capacity of unanchored steel liquid storage tank shell-to-base connections

Alain Nussbaumer, Gary Scott Prinz

Under strong earthquake motions, the liquid stored within large unanchored steel tanks can cause rocking and uplift of the tank base from the supporting foundation. Repeated rocking can lead to low-cycle fatigue fractures in the tank base-plate, and ultima ...

Springer Verlag2012

Size effect of welded thin-walled tubular joints

Alain Nussbaumer, Manfred Hirt

This paper clarifies the terminologies used to describe the size effect on fatigue behaviour of welded joints. It summarizes the existing research on size effect in the perspective of newly defined terminologies. It identifies knowledge gaps in designing t ...

2007

A critical examination of the size effect correction for welded steel tubular joints

Alain Nussbaumer, Luís Costa Borges

Welded circular hollow section (CHS) joints typical to bridge construction have been examined in an experimental, numerical, and analytical study with respect to their fatigue strength. Evidence from this study has indicated lower fatigue strength for join ...

Elsevier Ltd.2009

Traffic-Based Condition Assessment and Fatigue-Life Predictions for a Highway Bridge

Ian Smith, Alain Nussbaumer, Sai Ganesh Sarvotham Pai

Most civil infrastructure today was built during the second half of 20th century and is nearing the end of its service life. With increasing infrastructure demand that cannot be met with current resources for new supply, replacement of all aging infrastruc ...

Amer Soc Civil Engineers2017

Strengthening of Steel Connections in a 92-Year-Old Railway Bridge Using Prestressed CFRP Rods: Multiaxial Fatigue Design Criterion

Alain Nussbaumer, Elyas Ghafoori, Masoud Motavalli, Hossein Heydarinouri

This paper presented a new retrofit system for strengthening the stringer-to-floor-beam double-angle connections in a 92-year-old riveted railway bridge in Switzerland, using prestressed carbon fiber-reinforced polymer (CFRP) rods. The strengthening system ...

ASCE-AMER SOC CIVIL ENGINEERS2021

Calibration of partial safety factors for fatigue design of steel bridges

Alain Nussbaumer, Luca D'Angelo

The aim of this paper is to propose a new framework for assessment of fatigue partial safety factors with focus on steel bridges welded joints. Fatigue resistance S-N curves for constant amplitude (CA) and variable amplitude (VA) loadings are defined using ...

2015

A reanalysis of the fatigue strength of steel plates with holes, for application of the notch stress approach

Alain Nussbaumer, Cláudio Alexandre Pereira Baptista

2014

FE analysis and experimental validation of mechanical wedge-barrel anchors for CFRP rods

Alain Nussbaumer, Elyas Ghafoori, Hossein Heydarinouri

This paper presents a comparative study of the geometrical optimization of mechanical wedge-barrel anchors for prestressed carbon fiber-reinforced polymer (CFRP) rods. Various anchor configurations were simulated using three-dimensional finite-element (FE) ...

ELSEVIER SCI LTD2021

Probabilistic fatigue analysis of shop and field treated tubular truss bridges

Alain Nussbaumer, Scott Walbridge

This article examines the extent to which post-weld treatment by needle peening can improve the fatigue performance of tubular truss bridges. To do this, the various potential crack sites on several variants of a typical bridge are analyzed using a probabi ...

Elsevier2008

Numerical investigation of welding residual stresses in planar bridge trusses made of CHS steel proﬁles

Alain Nussbaumer, Claire Acevedo, Farshid Zamiri Akhlaghi

The weld-induced residual stresses in a tubular planar K-shaped connection made of construction steel grades S355J2H and S690QH are evaluated using three-dimensional finite element models in thermo-mechanical simulation of welding process. Both lumped sing ...

CRC Press/Balkema2012

Stress Analysis of Unbonded and Bonded Prestressed CFRP-strengthened Steel Plates

Alain Nussbaumer, Elyas Ghafoori, Masoud Motavalli, Ardalan Hosseini

Numerous research studies are available in the literature on strengthening of steel members using carbon fiber reinforced polymer (CFRP) composites. Although it is clear that strengthening using prestressed CFRP plates has several advantages over non-prest ...

The Hong Kong Polytechnic University2016

The mechanical behaviour of SentryGlas® ionomer and TSSA silicon bulk materials at different temperatures and strain rates under uniaxial tensile stress state

Alain Nussbaumer, Pieter Christian Louter, Manuel Santarsiero

2016

A reanalysis of fatigue test data for longitudinal welded gusset joints in as-welded and high frequency mechanical impact (HFMI)-treated state

Alain Nussbaumer

This study aims at clarifying the combined effect of different geometric parameters on the fatigue strength of longitudinal welded gusset joints. Statistical reanalyses with an up-to-date database for this detail were thus carried out on larger parameter r ...

ELSEVIER SCI LTD2021

Fatigue behaviour of CHS tubular bracings in steel bridges

Alain Nussbaumer, Cláudio Alexandre Pereira Baptista, Saad Kannuna

The structural solution for cross girder bracings or box girder diaphragms in steel bridges is often made with tubular elements, specially efficient if compression is required for structural behaviour. The connection between the tubular elements and the gi ...

Elsevier2017

Modelling fatigue crack propagation of a cracked metallic member reinforced by composite patches

Alain Nussbaumer

The concept of fracture for material elements at front of a crack for fatigue crack propagation was extended to the fatigue crack propagation of a cracked metallic member reinforced with a composite patch in this paper. From static mechanics and linear ela ...

Elsevier2009

Fatigue behavior of transverse attachments under constant and variable amplitude loading from a Swiss motorway bridge

Alain Nussbaumer

This paper investigates the fatigue behavior of non-load-carrying transverse welded steel attachments by reporting on an experimental characterization under constant and variable amplitude loading. Fatigue cracks have been monitored using DIC and ACPD tech ...

Elsevier Sci Ltd2023

Flexural behaviour of post-tensioned glass beams: Experimental and analytical study of three beam typologies

Alain Nussbaumer, Pieter Christian Louter, Jagoda Cupac

The concept of post-tensioned glass beams builds on the concrete analogy of the reinforced glass beams. By additionally prestressing the reinforcement in a post-tensioned system, a compressive pre-stress is applied on the glass, enhancing the initial fract ...

2021

A novel mechanical clamp for strengthening of steel members using prestressed CFRP plates

Alain Nussbaumer, Elyas Ghafoori, Ardalan Hosseini, Masoud Motavalli

Strengthening of existing steel members using prestressed carbon fiber reinforced polymer (CFRP) plates has certain advantages over non-prestressed reinforcement, especially due to the reduction in permanent tensile stresses acting on the steel members. Ho ...

2017

Fatigue Strength Upgrading of Cover Plate Ends by Welded Extensions in Existing Steel Bridge Girders

Alain Nussbaumer, Dimitrios Lignos, Vasileios Grigoriou

This paper investigates the fatigue upgrading of typical cover plate joint connections in existing steel bridge girders through cover plate extension. The upgraded detail is created by removing the existing transverse end weld, then welding the extension t ...

2018

A systematic approach to estimating traffic load effects on bridges using weigh-in-motion data

Alain Nussbaumer, Manfred Hirt, Matthew James Sjaarda

In contrast to the Swiss load model used for new bridge structures (SIA 261), which has roots in a Europe-wide weigh-in-motion (WIM) study and considers the full design life of new structures, the model for existing structures (SIA 269) from 2005 is derive ...

ERNST & SOHN2020