Detailed micro-modeling approach and solution strategy for laterally loaded reinforced masonry shear walls

2019 ◽  
Vol 201 ◽  
pp. 109786 ◽  
Author(s):  
Sebastián Calderón ◽  
Oriol Arnau ◽  
Cristián Sandoval
Keyword(s):  
Shear Walls ◽  
Solution Strategy ◽  
Modeling Approach ◽  
Reinforced Masonry ◽  
Micro Modeling ◽  
Laterally Loaded

Detailed micro-modeling of partially grouted reinforced masonry shear walls: extended validation and parametric study

2021 ◽  
Vol 21 (3) ◽  
Author(s):  
Sebastián Calderón ◽  
Cristián Sandoval ◽  
Gabriele Milani ◽  
Oriol Arnau
Keyword(s):  
Shear Strength ◽  
Aspect Ratio ◽  
Parametric Study ◽  
Shear Walls ◽  
Lateral Force ◽  
Reinforcement Ratio ◽  
Design Parameters ◽  
Compression Stress ◽  
Reinforced Masonry ◽  
Micro Modeling

AbstractPartially grouted reinforced masonry (PG-RM) shear walls have been widely used as structural elements in low- and medium-rise earthquake-resistant buildings. Nonetheless, assessing its shear strength represents a complex task mainly because the partial grouting provides a non-constant cross section, which results in heterogeneous stress–strain patterns. Consequently, refined modeling techniques are needed to reproduce local failure mechanisms taking place in these walls, which significantly influence the global response. In response to this issue, a detailed micro-modeling approach based on the finite element method was proposed in previous studies by the authors. Although the numerical strategy provided accurate results, further validation is required. Therefore, in this study, the experimental results of seven PG-RM shear walls of multi-perforated clay bricks with bed-joint reinforcement are employed as validation cases. These seven walls presented variations in five design parameters. The validated numerical model was then employed to perform a parametric study to assess the influence of the wall aspect ratio, axial pre-compression stress, and horizontal reinforcement ratio on the in-plane lateral behavior of PG-RM shear walls. The obtained results show that the three studied design parameters modified the crack patterns of the walls. Besides, increasing the axial pre-compression stress or reducing the aspect ratio resulted in higher walls’ shear strength. Additionally, decreasing the horizontal reinforcement ratio or increasing the aspect ratio generated a higher story-drift ratio at maximum lateral force. Finally, it was corroborated that the positive effect of the axial pre-compression stress on the walls’ shear strength decreases inversely proportional to the aspect ratio.

scholarly journals Experimental Investigation into the Seismic Performance of Prefabricated Reinforced Masonry Shear Walls with Vertical Joint Connections

2021 ◽  
Vol 11 (10) ◽  
pp. 4421
Author(s):  
Zhiming Zhang ◽  
Fenglai Wang
Keyword(s):  
Seismic Performance ◽  
Cross Sections ◽  
Shear Walls ◽  
Construction Method ◽  
Shear Capacity ◽  
Initial Stiffness ◽  
Equivalent Viscous Damping ◽  
Displacement Ductility ◽  
Reinforced Masonry ◽  
Cracking Performance

In this study, four single-story reinforced masonry shear walls (RMSWs) (two prefabricated and two cast-in-place) under reversed cyclic loading were tested to evaluate their seismic performance. The aim of the study was to evaluate the shear behavior of RMSWs with flanges at the wall ends as well as the effect of construction method. The test results showed that all specimens had a similar failure mode with diagonal cracking. However, the crack distribution was strongly influenced by the construction method. The lateral capacity of the prefabricated walls was 12% and 27% higher than that of the corresponding cast-in-place walls with respect to the rectangular and T-shaped cross sections. The prefabricated walls showed better post-cracking performance than did the cast-in-place wall. The secant stiffness of all the walls decreased rapidly to approximately 63% of the initial stiffness when the first major diagonal crack was observed. The idealized equivalent elastic-plastic system showed that the prefabricated walls had a greater displacement ductility of 3.2–4.8 than that of the cast-in-place walls with a displacement ductility value of 2.3–2.7. This proved that the vertical joints in prefabricated RMSWs enhanced the seismic performance of walls in shear capacity and ductility. In addition, the equivalent viscous damping of the specimens ranged from 0.13 to 0.26 for prefabricated and cast-in-place walls, respectively.

Out-of-Plane Performance of Reinforced Masonry Shear Walls Constructed with Boundary Elements

2019 ◽  
Vol 145 (8) ◽  
pp. 04019073 ◽  
Author(s):  
Tarek El-Hashimy ◽  
Mohamed Ezzeldin ◽  
Michael Tait ◽  
Wael El-Dakhakhni
Keyword(s):  
Shear Walls ◽  
Boundary Elements ◽  
Reinforced Masonry ◽  
Out Of Plane

scholarly journals Hybrid Micro-Modeling Approach for the Analysis of the Cyclic Behavior of RC Frames

2018 ◽  
Vol 4 ◽  
Author(s):  
Gianni Blasi ◽  
Flavia De Luca ◽  
Maria Antonietta Aiello
Keyword(s):  
Cyclic Behavior ◽  
Modeling Approach ◽  
Rc Frames ◽  
Micro Modeling

Efficient Robust Design for Thermoacoustic Instability Analysis: A Gaussian Process Approach

2019 ◽  
Author(s):  
Shuai Guo ◽  
Camilo F. Silva ◽  
Wolfgang Polifke
Keyword(s):  
Gaussian Process ◽  
Robust Design ◽  
Large Parameter ◽  
Solution Strategy ◽  
Gas Turbine Combustor ◽  
Instability Analysis ◽  
Thermoacoustic Instability ◽  
Modeling Approach ◽  
Uncertainty Sources ◽  
Preliminary Phase

Abstract In the preliminary phase of analysing the thermoacoustic characteristics of a gas turbine combustor, implementing robust design principles is essential to minimize detrimental variations of its thermoacoustic performance under various sources of uncertainties. In the current study, we systematically explore different aspects of robust design in thermoacoustic instability analysis, including risk analysis, control design and inverse tolerance design. We simultaneously take into account multiple thermoacoustic modes and uncertainty sources from both the flame and acoustic boundary parameters. In addition, we introduce the concept of a “risk diagram” based on specific statistical descriptions of the underlying uncertain parameters, which allows practitioners to conveniently visualize the distribution of the modal instability risk over the entire parameter space. Throughout the present study, a machine learning method called “Gaussian Process” (GP) modeling approach is employed to efficiently tackle the challenge posed by the large parameter variational ranges, various statistical descriptions of the parameters as well as the multifaceted nature of robust design analysis. For each of the investigated robust design tasks, we propose an efficient solution strategy and benchmark the accuracy of the results delivered by GP models. We demonstrate that GP models can be flexibly adjusted to various tasks while only requiring one-time training. Their adaptability and efficiency make this modeling approach very appealing for industrial practices.

scholarly journals A fast modeling approach for numerical analysis of unreinforced and FRCM reinforced masonry walls under out-of-plane loading

2020 ◽  
Vol 180 ◽  
pp. 107553 ◽  
Author(s):  
Jacopo Scacco ◽  
Bahman Ghiassi ◽  
Gabriele Milani ◽  
Paulo B. Lourenço
Keyword(s):  
Numerical Analysis ◽  
Masonry Walls ◽  
Modeling Approach ◽  
Reinforced Masonry ◽  
Out Of Plane
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