Distortion-Induced Fatigue Reassessment of a Welded Bridge Detail Based on Structural Stress Methods

Alencar

2023

Metals

Self Cite

Fatigue cracking is one of the most prominent causes of mechanical failure limiting the service life of existing steel and composite steel–concrete bridges and is among the central concerns of structural and bridge engineers. In this context, the current work presents some recent advancements in an existing methodology for fatigue analysis developed by the authors throughout the years. The methodology is specifically devoted to the fatigue assessment of composite steel–concrete bridges employing the local hot-spot S-N approach and a coupled vehicle–pavement–bridge system considering progressive pavement deterioration with stochastically generated roughness profiles. Two different methodologies were used to solve the dynamic equilibrium equations: the modal superposition method to solve the bridge dynamic equations and a direct integration method to solve the vehicle dynamic equations. From a computational point of view, the present approach is more efficient and detailed than previous versions, as it allows a significant reduction in the analysis time and the use of complex bridge and vehicle finite element models. In this regard, a case study of a highway composite steel–concrete bridge spanning 40 m was selected in order to demonstrate the usefulness of the presented improved methodology by carrying out a fatigue analysis. The results of this investigation (displacements and stresses) are presented, aiming to verify the factors that directly influence the structural response and, consequently, the service life of steel–concrete composite highway bridges.

Section: Fatigue Assessment Methodology Finite Element Modelling Meth...mentioning

confidence: 69%

Advances in Methodology for Fatigue Assessment of Composite Steel–Concrete Highway Bridges Based on the Vehicle–Bridge Dynamic Interaction and Pavement Deterioration Model

Alencar

2023

Metals

Self Cite

Smart Manufacturing and Material Processing (SMMP)

“…Compared with the nominal stress method, the equivalent structural stress method can comprehensively consider the influence of stress concentration, component size and load form, and can calculate the fatigue life of different structures through the same main S-N curve (Quissanga et al, 2021;Pelykh et al, 2012). Therefore, the equivalent structural stress method is selected in the calculation of fatigue life.…”

Section: Transformation Of Nominal Stress and Equivalent Structural S...mentioning

confidence: 99%

Main S-N Curve Fitting and Metallographic Structure Analysis of Welded Joint of Rotary Drilling Rig

Jatinkumar V,

Qian,

Wang

et al. 2023

In order to realize the accurate fatigue life analysis of the weld seam of the mast of the rotary drilling rig, a reasonable size of the welded joint sample was prepared in this paper, and the fatigue performance test of the welded joint was carried out by using the fatigue testing machine. The fatigue data under different nominal stresses were obtained, and the nominal stress S-N curve was fitted. Using finite element analysis, the node force at the weld toe section is extracted, and the equivalent node force and node bending moment of the weld toe section are obtained. The structural stress and equivalent structural stress of the welded joint of the sample are calculated, and the equivalent structural stress S-N curve is obtained. The fatigue performance of the welded joint is analyzed by metallographic observation, which is prepared for the next calculation of the fatigue life of the mast.

“…As discussed above, decision-making on which construction method to adopt results from an in-depth analysis of several conditioning factors, such as: ease of execution (technical feasibility), cost, safety (during the process and/or carrying out of the bridge), construction time, technical capacity of professionals and others (Quissanga et al, 2021;2022;Reis and Peres, 2016;Zhou at al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Analysis and verification of stresses in reinforced concrete bridge projects of the box type with sequential application of prestress based on the successive advancement method

Zeferino,

Silva,

Boa Esperança

et al. 2024

RSD

Given the importance of road bridge systems for the development of a country, rigor in the design process becomes extremely essential in order to meet all requirements related to their functionality. One of the challenging aspects of avoiding possible collapse problems at the beginning or during the construction phase of the project is the selection of the construction process. In this context, the criteria for defining the construction process to be adopted is intrinsically linked to cost, ease of execution, and safety during the creation of the work of art, construction time and the technical capacity of the construction professionals. In this study, deformation analyses and the evolution of efforts in the upper fibers of a bridge were carried out based on conventional construction methods, taking into account the application of pre-stress during construction, aiming to compare the results. Highlighting that the critical tensions were overcome with the help of applying pre-stress in a phased and/or sequential manner. The structural system in question is a single-cell box bridge made of pre-stressed concrete with variable height, measuring 2.50 m in the middle of the span and 4.70 m at the supports. The computational numerical modelling was developed based on the use of finite element programs CSiBridge v.20 and Robot Structural, considering bar and plate/shell/shell elements. Using the method of successive symmetric advances, a longitudinal, linear-static analysis was carried out (neglecting dynamic effects), taking into account the zero, corresponding and closing staves with length measurements of 6.40 m, 4.20 m and 3.00 m, respectively. The results were compared, where it was concluded that the efforts obtained in the construction phase after closing the consoles turned out to be relatively lower due to the redistribution of efforts, taking into account the change in the structural system from isostatic to hyperstatic. With this change, tensile stresses appeared in the lower fibers (this during the construction phase), increasing by 92.10% during the operation phase. The tensile efforts of the upper fibers in the support area increased by 85.6% from the construction phase to the operation phase. Regarding the pre-stressing strength of the concrete, it was applied in order to guarantee reduced losses resulting in values lower than 15%.