Simplified frame model for capacity assessment of masonry buildings

Shrestha, Jagat Kumar; Bhandari, Sujit; Pradhan, Shreekar; Gautam, Dipendra

doi:10.1016/j.soildyn.2020.106056

Cited by 5 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vertical separation cracks and corner failures that trigger short wall collapse are the main failure modes in PRE-SMM buildings, as confirmed by observed damage and the results of numerical analyses (Adhikari and D'Ayala, 2020). Shrestha et al (2020) proposed a generalized analysis scheme, and a simplified frame model and results from SFM show strong agreement with the experimental result for base shear and approximately 5% error in the case of ultimate drift. The simplified model can be used in the performance-based design of masonry buildings and for the assessment of existing masonry buildings and for low-rise masonry buildings.…”

Section: Introductionmentioning

confidence: 53%

Enhancement of Himalayan irregular stone masonry buildings for resilient seismic design

Khadka

Acharya²,

Acharya³

et al. 2023

Front. Built Environ.

View full text Add to dashboard Cite

In the Himalayan region of Nepal, stone masonry has been used for centuries as the primary building material for structures with or without mud mortar. In three distinct remote rural villages, a thorough structural survey of approximately 223 buildings was conducted with an emphasis on their structural irregularities. The thickness of masonry walls frequently varied between floors, which caused mass irregularities. Openings in the front wall of the buildings were not symmetrical in the vertical direction, which caused in-plane discontinuity. There were also out-of-plane offset irregularities due to the cross wall on the ground floor. These buildings were irregular in many aspects and were constructed without seismic considerations. This type of construction is more susceptible to earthquakes as a result of these irregularities. In this study, a thorough examination of a typical building was conducted using construction information obtained following the 2015 Gorkha earthquake. The database for each structural typology was prepared with an emphasis on construction practice to enhance the seismic design. The use of mud/cement mortar was extremely sparse, and the use of timber bands at various heights along the height of the masonry wall and an inappropriate connection between the wall and the roof were also negligible. The three main community-learned improvements following damage were the replacement of the gable wall with a metal sheet, the reduction of individual stone masonry homes to one story, and lighter construction on the upper stories of hotel buildings. Based on regional building techniques, non-linear finite models for typical and enhanced buildings were simulated. Due to the irregular stone units, construction variability, and constrained linear behavior, stone masonry with and without mud mortar presents difficulties in conducting a detailed numerical analysis. The development of these structures using mud/cement mortar and other regional materials, with careful attention to detail, was found to have significant potential as a seismically resilient building form.

show abstract

Section: Introductionmentioning

confidence: 53%

Enhancement of Himalayan irregular stone masonry buildings for resilient seismic design

Khadka

Acharya²,

Acharya³

et al. 2023

Front. Built Environ.

View full text Add to dashboard Cite

show abstract

“…Notably, Augenti et al [21] have congregated online experimental data to facilitate numerical modeling of masonry structures. In the case of unavailability of the testing facility, many researchers have considered computational approaches to depict the behavior of masonry walls and structures (e.g., [22][23][24], among others). More focus on masonry research converges toward mechanical characterization of bonding behavior, cohesion, and friction between masonry constituents (e.g., [25,26]).…”

Section: Introductionmentioning

confidence: 99%

In-plane behavior of various brick bonds in masonry walls

Shrestha

Pradhan

Gautam

2020

Innov. Infrastruct. Solut.

Self Cite

View full text Add to dashboard Cite

An analytical investigation is carried out to evaluate the influence of brick bond types in in-plane behavior of brick masonry. Header, Stretcher, and English bonds are chosen for numerical simulation for in-plane loading. For numerical modeling, simplified micro-modeling approach is adopted using plasticity-based constitutive models. Three-dimensional nonlinear simulations for the brick bonds for various aspect ratios and pre-compression are carried out in this study. The lateral in-plane displacement control loading is applied for each model until the ultimate failure. The sum of observations highlights that there would be no variation in the elastic behavior of various brick bonds. However, nonlinear analyses highlight that there would be significant variation in the behavior of masonry bonds the diagonal cracking would govern the failure mechanism mostly. Keywords Brick masonry • Brick bond • Compressive strength • In-plane behavior • Micro-modeling List of symbols H Height of wall L Length of wall E u Elastic modulus of units E m Elastic modulus of mortar E nn Elastic stiffness of masonry joints in the normal direction K ss Stiffness of masonry joints in the first shear direction K tt Stiffness of masonry joints in the second shear direction t n max Maximum allowable traction stress in masonry joints in the normal direction G f I Work done by the traction-separation in the normal directionG f II Work done by the traction-separation in the shear direction c Cohesion between the masonry joints interfaces μ Poisson's ratio of the masonry joints interfaces σ c Compressive strength of masonry

show abstract

“…(Vanin et al, 2020) The equivalent beam-based model, also referred to as the equivalent frame model, represents the piers and spandrels of the structure using frame components connected by rigid nodes. (Shrestha et al, 2020) The nonlinear mechanical properties are represented by nonlinear springs defined in the frame components, based on the possible in-plane failure mechanisms for the masonry; rocking, diagonal cracking, or shear sliding. (Shrestha et al, 2020) The spring-based modelling approach represents the masonry with rigid frame components connected by nonlinear springs.…”

Section: Numerical Modelling Methodsmentioning

confidence: 99%

“…(Shrestha et al, 2020) The nonlinear mechanical properties are represented by nonlinear springs defined in the frame components, based on the possible in-plane failure mechanisms for the masonry; rocking, diagonal cracking, or shear sliding. (Shrestha et al, 2020) The spring-based modelling approach represents the masonry with rigid frame components connected by nonlinear springs. (D'Altri et al, 2020) The rigid frame components capture the geometry of the structure, while the mechanical properties of the material are presented by the properties defined for the springs.…”

Section: Numerical Modelling Methodsmentioning

confidence: 99%

Seismic Analysis of Unreinforced Masonry Structures with Plan Irregularities

Hamp¹

View full text Add to dashboard Cite

Unreinforced masonry (URM) is inherently vulnerable to seismic forces due to its minimal ability to resist tensile forces. Typical structural design features in URM buildings such as torsional irregularities and re-entrant corners increase this vulnerability.This thesis seeks to address the seismic vulnerability of URM structures due to plan irregularities and to contribute to the structural engineering knowledge required to lessen the need for new construction by supporting the reuse, rehabilitation, and ongoing maintenance of existing buildings. A comparative analysis based on the results of nonlinear static and incremental dynamic analyses was carried out on numerical models representing URM structures with plan irregularities typical in Ottawa, Canada. The results from these analyses determined that damages to the structure and the probability of collapse of the structure were reduced overall with the minimization of torsion and full lateral support of the re-entrant corners in the modelled structures.

show abstract

Simplified frame model for capacity assessment of masonry buildings

Cited by 5 publications

References 12 publications

Enhancement of Himalayan irregular stone masonry buildings for resilient seismic design

Enhancement of Himalayan irregular stone masonry buildings for resilient seismic design

In-plane behavior of various brick bonds in masonry walls

Seismic Analysis of Unreinforced Masonry Structures with Plan Irregularities

Contact Info

Product

Resources

About