Prediction of the residual strength for durability failure of concrete structure in acidic environments

Li, Beixing; Cai, Laohu; Wang, Kai; Zhang, Yaming

doi:10.1007/s11595-016-1373-0

Cited by 13 publications

(8 citation statements)

References 10 publications

(13 reference statements)

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“…The average final estimates of parameters 𝑓 𝑐,𝑊 ′ and 𝑓 𝑐,𝐸 ′ are approximately 30% and 26% less than their initial values. Previous studies [63,64] have shown more than 25% reductions in concrete compressive strength of deteriorated concrete structures-e.g., abandoned structures and structures in acidic environments. Considering that the operating environment of girders caused them to be prone to various damage mechanisms (including concrete degradation, as well as steel corrosion as discussed in Section 2.1) the final estimates of parameters 𝑓 𝑐,𝑊 ′ and 𝑓 𝑐,𝐸 ′ are reasonable.…”

Section: Resultsmentioning

confidence: 98%

A Two-step FE Model Updating Approach for System and Damage Identification of Full-Scale Prestressed Bridge Girders

Malekghaini¹,

Ghahari²,

Ebrahimian³

et al. 2022

Preprint

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The average age of in-service bridges has increased in recent years in the United States. To address this issue, structural health monitoring and damage identification approaches can be employed to prioritize maintenance/replacement of aging bridges. Among the damage identification and operational health monitoring approaches, finite element (FE) model updating methods can offer a solution to evaluate the mechanics-based characteristics of bridges. However, in a real-world setting, unidentifiability and mutual dependency between model parameters, modeling errors, especially due to boundary conditions, as well as ill-conditioning of updating algorithms can pose challenges to the application of FE model updating methods. To address these challenges, this study presents a two-step FE model updating approach. In the first step, modal-based model updating is used to estimate linear model parameters mainly related to the stiffness of boundary conditions and material properties. In the second step, in order to refine parameter estimation accounting for nonlinear response behavior of the bridge, a time-domain model updating is carried out. In this step, boundary conditions are fixed at their final estimates using modal-based model updating. To prevent the convergence of updating algorithm to local solutions, the initial estimates for nonlinear material properties are selected based on their corresponding final estimates in the modal-based model updating. To validate the applicability of the two-step FE model updating approach, a series of forced-vibration experiments are designed and carried out on a pair of decommissioned and deteriorated prestressed bridge I-girders. After carrying out the two-step FE model updating, the final estimates of concrete compressive strength are shown to provide reasonable assessment of the damage extent in the girders.

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Section: Resultsmentioning

confidence: 98%

A Two-step FE Model Updating Approach for System and Damage Identification of Full-Scale Prestressed Bridge Girders

Malekghaini¹,

Ghahari²,

Ebrahimian³

et al. 2022

Preprint

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“…However, due to the shortage of wood resources and fire safety considerations, the government set strict rules to limit the use of timber and more attention was paid on the study and construction of steel and concrete a The Glulam Beam is locally manufactured by YF, its elasticity modulus is obtained based on their tested results. structures (Li et al, 2016;Karol et al, 2018;Li and Wang, 2021). Thus, the timber construction decreased rapidly and there have height and area limitations on it (timber structures were once limited to no more than three storeys in China, and the height was limited to no more than 10 m) (GB50016-2014: Code for Building Ddesign on Ffire protection, 2018).…”

Section: Timber Construction In Chinamentioning

confidence: 99%

Structural Design and Analysis for a Timber-Concrete Hybrid Building

Zhang

Huang

et al. 2022

Front. Mater.

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The benefits of using wood in tall and commercial construction are undisputed, namely reducing the carbon footprint, shortening construction times, and enhancing seismic and building physics performance. The international market for wood as a structural material in tall and non-residential construction, however, is still relatively untapped. China is home to the world’s largest population and the largest construction sector worldwide, yet wood products are only used in a small fraction of buildings. The main reasons for this situation are the fire regulations and lack of guidelines for novel wood-based structural systems. This paper describes the design of a 10-storey timber-concrete business hotel which will be erected in the Guizhou province of China. The foundation design, gravity system design, lateral load resisting system design, seismic analysis and the fire resistance design were conducted, and the procedure provided appropriate information to the technological feasibility to promote the development of timber-based hybrid high-rise construction systems in China.

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“…a) Incomplete element information, b) incomplete structural information, c) incomplete boundary information, and d) incomplete operational behavior information [18]. Gray system theory uses the gray system method and modeling technology, through the analysis of a small amount of "known information", to identify the key information and relationships in the system and to predict the future development trend of the system [19,20]. GM has differences and compatibility, GM structure has elasticity and diversity, GM is a constant coefficient in nature, and its parameter distribution is gray [21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Relationship between Mechanical Properties and Pore Structure of MSW Incineration Bottom Ash Fine Aggregate Concrete after Freeze-Thaw Cycles Based on the Gray Theory

Zhang¹,

Shi²,

Han³

et al. 2023

Journal of Renewable Materials

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The destruction of concrete building materials in severely cold regions of the north is more severely affected by freeze-thaw cycles, and the relationship between the mechanical properties and pore structure of concrete with fine aggregate from municipal solid waste (MSW) incineration bottom ash after freeze-thaw cycles is analyzed under the degree of freeze-thaw hazard variation. In this paper, the gray correlation method is used to calculate the correlation between the relative dynamic elastic modulus, compressive strength, and microscopic porosity parameters to speculate on the most important factors affecting their changes. The GM (1,1) model was established based on the compressive strength of the waste incineration ash aggregate concrete, the relative error between the simulated and actual values in the model was less than 5%, and the accuracy of the model was level 1, indicating that the GM (1,1) model can well reflect the change in the compressive strength of the MSW incineration bottom ash aggregate concrete during freeze-thaw cycles. Using the gray correlation method, the correlation between the relative dynamic elastic modulus, compressive strength, air content, specific surface area, pore spacing coefficient, and pore average chord length was calculated, and the pore spacing coefficient and pore average chord length were determined to be highly correlated with each other. This determination can help analyze and infer the deterioration mechanism of concrete subject to freeze-thaw cycles. These results can provide a theoretical basis for guiding the engineering practice of concrete with fine aggregates of household bottom ash in the northern cold region.

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Prediction of the residual strength for durability failure of concrete structure in acidic environments

Cited by 13 publications

References 10 publications

A Two-step FE Model Updating Approach for System and Damage Identification of Full-Scale Prestressed Bridge Girders

A Two-step FE Model Updating Approach for System and Damage Identification of Full-Scale Prestressed Bridge Girders

Structural Design and Analysis for a Timber-Concrete Hybrid Building

Analysis of the Relationship between Mechanical Properties and Pore Structure of MSW Incineration Bottom Ash Fine Aggregate Concrete after Freeze-Thaw Cycles Based on the Gray Theory

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