scholarly journals ON THE USE OF POINT CONTACT MODELS FOR COLLAPSE MECHANISM AND DYNAMIC ANALYSIS OF MASONRY STRUCTURES

2017 ◽  
Author(s):  
Francesco Portioli ◽  
Lucrezia Cascini ◽  
Raffaele Landolfo
Keyword(s):  
Dynamic Analysis ◽  
Point Contact ◽  
Collapse Mechanism ◽  
Masonry Structures ◽  
Contact Models

scholarly journals Progressive Collapse Assessment: A review of the current energy-based Alternate Load Path (ALP) method

2019 ◽  
Vol 258 ◽  
pp. 02012 ◽  
Author(s):  
Nur Ezzaryn Asnawi Subki ◽  
Hazrina Mansor ◽  
Yazmin Sahol Hamid ◽  
Gerard Parke
Keyword(s):  
Dynamic Analysis ◽  
Static Analysis ◽  
Progressive Collapse ◽  
Structural Response ◽  
Steel Frame ◽  
Collapse Mechanism ◽  
Load Path ◽  
Acceptance Criterion ◽  
Current Energy ◽  
Collapse Assessment

The Alternate Load Path (ALP) is a useful method that has generated a considerable recent research interest for the assessment of progressive collapse. The outcome of the ALP analysis can be assessed either using the force-based approach or the energy-based approach. The Unified Facilities Criteria (UFC- 4- 023-03) of progressive collapse guideline - have outlined that the force-based approach can either be analysed using static or dynamic analysis. The force-based approach using static analysis is preferable as it does not require a high level of skill and experience to operate the software plus no effort is required in scrutinising the validity of the analysis results output. However, utilising the static approach will eliminate the inertial effect in capturing the actual dynamic response of the collapsed structure. In recent years, the development of the energy-based progressive collapse assessment is attracting widespread interest from researchers in the field; as the approach can produce a similar structural response with the force-based dynamic analysis by only using static analysis. Most of the current energy-based progressive collapse assessments are developed following the requirements which are given in the progressive collapse guidelines provided by the Unified Facilities Criteria. However, little attention is given to the development of the energy-based approach using the Eurocode standards as a base guideline. This article highlights the merits of utilising the energy-based approach against the force-based approach for a collapsed structure and explains the collapse mechanism of a steel frame in the perspective of the energy concept. The state of the art of energy-based progressive collapse assessment for a structural steel frame is reviewed. The comprehensive review will include insights on the development of the energy-based method, assumptions, limitations, acceptance criterion and its applicability with the European standards. Finally, potential research gaps are discussed herein.

Numerical methods for the dynamic analysis of masonry structures

2006 ◽  
Vol 22 (1) ◽  
pp. 107-130 ◽  
Author(s):  
Silvia Degl'Innocenti ◽  
Cristina Padovani ◽  
Giuseppe Pasquinelli
Keyword(s):  
Numerical Methods ◽  
Dynamic Analysis ◽  
Masonry Structures

The Use of TPMC for Designing MRFs Equipped with FREEDAM Connections: Performance Evaluation

2018 ◽  
Vol 763 ◽  
pp. 983-991 ◽  
Author(s):  
Rosario Montuori ◽  
Elide Nastri ◽  
Vincenzo Piluso ◽  
Simona Streppone
Keyword(s):  
Performance Evaluation ◽  
Dynamic Analysis ◽  
Design Procedure ◽  
Incremental Dynamic Analysis ◽  
Companion Paper ◽  
Collapse Mechanism ◽  
The Real ◽  
Interstorey Drift ◽  
Global Type ◽  
Steel Mrfs

The work herein presented is devoted to the validation of TPMC design procedure applied to steel MRFs equipped with FREEDAM dampers located at beam-to-column joints. The seismic performances evaluations of the designed structure have been carried out by means of both Push-over analysis and Incremental Dynamic Analysis. In particular, the Push-over analysis aims to confirm the real development of a collapse mechanism of global type, while, through IDA analysis, Maximum Interstorey Drift and Top Residual Displacement performed by the designed structures have been pointed out. For this reason, a MRF whose design procedure by TPMC is detailed in a companion paper has been subjected to both push-over and IDA analysis.

A Generalized Contact Model for Nonlinear Dynamic Analysis of Floating Offshore Systems

2006 ◽  
Author(s):  
Danilo Machado Lawinscky da Silva ◽  
Fabri´cio Nogueira Correˆa ◽  
Breno Pinheiro Jacob
Keyword(s):  
Data Structure ◽  
Dynamic Analysis ◽  
Case Studies ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Contact Model ◽  
Non Linear ◽  
Contact Models ◽  
Lateral Friction

The objective of this work is to present the implementation of a contact model that represents, during a nonlinear dynamic analysis of floating offshore systems, the contact of lines with the platform, as well as the contact involving different lines and, eventually, involving two different platforms in the same model. Traditional contact models consider for instance a generalized scalar element, consisting of two nodes linked by a non-linear gap spring. In this work, the contact model is geometrically defined by volumes that cannot interpenetrate. A penetration stiffness can be defined for each volume; lateral friction can also be considered by this model. An appropriate data structure is used to define the volumes and guarantee the efficiency of the algorithm by an optimized search. The application of the presented contact model is demonstrated by case studies of actual applications for offshore systems: pipelines in S-Lay installation operations, where the contact is complex, specified only in some points of the ramp and stinger; offloading floating hoses that may collide with the hull of the ship, and catlines in lift operations.

Structural Repointing of Masonry Structures

2019 ◽  
Vol 817 ◽  
pp. 412-420
Author(s):  
Jaime Gonzalez-Libreros ◽  
Tommaso D'Antino ◽  
Francesco Focacci ◽  
Christian Carloni ◽  
Carlo Pellegrino
Keyword(s):  
Tensile Strength ◽  
Fiber Reinforced Polymer ◽  
Analytical Models ◽  
Collapse Mechanism ◽  
Masonry Structures ◽  
Reinforcing Bars ◽  
Reinforced Polymer ◽  
Structural Capacity ◽  
Mechanical Models ◽  
Strengthening Technique

Existing masonry structures are often in need of strengthening due to the limited masonry tensile strength and consequent occurrence of cracks, which can lead to collapse of the structure. To control the cracking phenomena and increase the load associated with a certain collapse mechanism, structural repointing by means of reinforcing bars inserted in the mortar bed joints can be employed. Fiber reinforced polymer (FRP) bars have been used for repointing due to their high tensile strength and good resistance to corrosion. Although structural repointing is a well-known and diffused strengthening technique, limited research is available in the literature and reliable analytical models to compute the structural capacity of repointed members are missing. In this paper, experimental results of masonry members strengthened with structural repointing found in the literature are analyzed and discussed to provide indications on the contribution of repointing in the masonry strength and identify mechanical models able to predict the failure load of repointed masonry members.

DYNAMIC ANALYSIS OF THE INTERACTION BETWEEN BELLS AND MASONRY STRUCTURES

2020 ◽  
Author(s):  
David Bru ◽  
Salvador Ivorra ◽  
Michele Betti ◽  
Gianni Bartoli ◽  
F. Javier Baeza ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Masonry Structures

Seismic Vulnerability Assessment of Multistory Timber Braced Frame Traditional Masonry Structures

2012 ◽  
Vol 601 ◽  
pp. 168-172 ◽  
Author(s):  
Naveed Ahmad ◽  
Qaisar Ali ◽  
Muhammad Umar
Keyword(s):  
Dynamic Analysis ◽  
Seismic Vulnerability ◽  
Seismic Analysis ◽  
Pushover Analysis ◽  
Elastic Beam ◽  
Lateral Force ◽  
Experimental Results ◽  
Constitutive Law ◽  
Masonry Structures ◽  
Braced Frame

Research carried out on the seismic investigation of timber braced frame (TBF) masonry structures of traditional construction practice is presented, essential for seismic performance evaluation of such construction type using engineering approaches. An innovative simplified equivalent frame method (EFM) based on macro modelling approach is presented for nonlinear dynamic seismic analysis of TBF masonry structures. The modelling include EFM idealization of wall using stiff elastic beam-column element assigned with moment-rotation (M-θ) nonlinear lumped plasticity hinges. Earlier, the approach i.e. the EFM idealization and M-θ constitutive law, is calibrated with the experimental results obtained through quasi-static cyclic test on full scale walls. The technique is further extended herein for seismic dynamic analysis of multistory structures. Generalization of the technique for modelling walls of various geometry and loading is performed. It included nonlinear static pushover analysis of various case study walls, by means of SAP2000 calibrated earlier with experimental results, for the derivation of lateral force-deformability behavior towards the development of generalized M-θ constitutive law for TBF masonry walls. Three representative structures, from one to three storeys, are analyzed using a suite of ten natural accelerograms and incremental dynamic analysis technique. Structure fragility and resilience functions are derived using a fully probabilistic and dynamic approach. The structures analyzed in the present study represent TBF masonry wall structures, called as Dhajji-Dewari structures, common in Northern areas of Pakistan.

Sign in / Sign up

Export Citation Format

Share Document