Analytical Model to Capture the In-Plane and Out-of-Plane Seismic Behavior of Nonstructural Partition Walls with Returns

2017 ◽  
Vol 143 (6) ◽  
pp. 04017033 ◽  
Author(s):  
Esmaeel Rahmanishamsi ◽  
Siavash Soroushian ◽  
Emmanuel “Manos” Maragakis ◽  
Reihaneh Sarraf Shirazi
Keyword(s):  
Analytical Model ◽  
Seismic Behavior ◽  
Partition Walls ◽  
Out Of Plane

Comparison of Failure Modes of Piping Systems With Wall Thinning Subjected to In-Plane, Out-of-Plane and Mixed Mode Bending Under Seismic Load: Computational Approach

2007 ◽  
Author(s):  
Satoshi Tsunoi ◽  
Akira Mikami ◽  
Izumi Nakamura ◽  
Akihito Otani ◽  
Masaki Shiratori
Keyword(s):  
Analytical Model ◽  
Failure Modes ◽  
Experimental Investigations ◽  
Seismic Load ◽  
Piping System ◽  
Wall Thinning ◽  
Piping Systems ◽  
Out Of Plane ◽  
Seismic Loadings ◽  
Local Wall Thinning

The authors have proposed an analytical model by which they can simulate the dynamic and failure behaviors of piping systems with local wall thinning against seismic loadings. In the previous paper [13], the authors have carried out a series of experimental investigations about dynamic and failure behaviors of the piping system with fully circumferential 50% wall thinning at an elbow or two elbows. In this paper these experiments have been simulated by using the above proposed analytical model and investigated to what extent they can catch the experimental behaviors by simulations.

scholarly journals Macro-Modelling Approach for the In-Plane Cyclic Response of Cold-Formed Steel Partition Walls

2020 ◽  
Vol 10 (22) ◽  
pp. 8163
Author(s):  
Dong-Hyeon Shin ◽  
Hyung-Joon Kim
Keyword(s):  
Analytical Model ◽  
Structural Damage ◽  
Damage Mechanism ◽  
Dissipated Energy ◽  
Analysis Model ◽  
Partition Wall ◽  
Cyclic Response ◽  
Partition Walls ◽  
Cold Formed Steel ◽  
Modelling Approach

Past earthquakes demonstrate that non-structural elements could be vulnerable to a relatively low intensity ground shaking which induces negligible structural damage. The study aims to improve previously developed macro-models of cold-formed steel (CFS) partition walls to properly capture their in-plane cyclic response and damage states of important components in a CFS partition wall under imposed excitation. An effective analytical modelling approach is adopted for a simple modelling procedure and less computational effort. The proposed analysis model of partition walls consisting of several lumped spring elements is verified using direct comparison with two full scale CFS partition wall tests. The analytical and experimental results are compared in terms of force–displacement relations, dissipated energy, and an influential damage mechanism of components consisting of partition walls. The comparison shows that the analytical model well captures the experimental response such as the overall strength and stiffness degradation and pinching behavior. Moreover, the damage mechanism predicted by the analytical model is in good agreement with that observed during the tests.

scholarly journals Simulation Informed CAD for 3D Nanoprinting

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 8 ◽  
Author(s):  
Jason D. Fowlkes ◽  
Robert Winkler ◽  
Eva Mutunga ◽  
Philip D. Rack ◽  
Harald Plank
Keyword(s):  
Analytical Model ◽  
Computer Aided Design ◽  
Critical Mass ◽  
Three Dimensional ◽  
Three Dimensional Objects ◽  
Non Linear ◽  
Out Of Plane ◽  
Digital Scanning ◽  
Definition Of ◽  
Bending Nanowires

A promising 3D nanoprinting method, used to deposit nanoscale mesh style objects, is prone to non-linear distortions which limits the complexity and variety of deposit geometries. The method, focused electron beam-induced deposition (FEBID), uses a nanoscale electron probe for continuous dissociation of surface adsorbed precursor molecules which drives highly localized deposition. Three dimensional objects are deposited using a 2D digital scanning pattern—the digital beam speed controls deposition into the third, or out-of-plane dimension. Multiple computer-aided design (CAD) programs exist for FEBID mesh object definition but rely on the definition of nodes and interconnecting linear nanowires. Thus, a method is needed to prevent non-linear/bending nanowires for accurate geometric synthesis. An analytical model is derived based on simulation results, calibrated using real experiments, to ensure linear nanowire deposition to compensate for implicit beam heating that takes place during FEBID. The model subsequently compensates and informs the exposure file containing the pixel-by-pixel scanning instructions, ensuring nanowire linearity by appropriately adjusting the patterning beam speeds. The derivation of the model is presented, based on a critical mass balance revealed by simulations and the strategy used to integrate the physics-based analytical model into an existing 3D nanoprinting CAD program is overviewed.

Pre-Tensioned Basalt Fibers Ropes Stitching for Masonry Strengthening against Vertical Bending: A First Experimental Insight

2017 ◽  
Vol 747 ◽  
pp. 119-127 ◽  
Author(s):  
Francesco Monni ◽  
Enrico Quagliarini ◽  
Stefano Lenci
Keyword(s):  
Seismic Behavior ◽  
Basalt Fiber ◽  
Masonry Wall ◽  
Masonry Walls ◽  
Architectural Heritage ◽  
Experimental Campaign ◽  
Out Of Plane ◽  
Most Significant Change ◽  
Synthetic Adhesives ◽  
The Common

This paper presents the results of an experimental campaign aimed at improving the innovative technique of continuos basalt fiber (BF) stitching in order to repair the masonry panels damaged by seismic events or to enhance the seismic behavior of unreinforced masonry walls. The masonry panels were tested under out-of-plane actions, one of the common way of failure for masonry walls during an earthquake. The most significant change introduced respect to the system already tested in previous studies, is the presence of pre-tensioned elements and mechanical anchorage of the BF ropes, always with the end of proposing a dry retrofitting system. The results indicate the effectiveness of this, increasing the performance of masonry wall specimens under out-of-plane actions respect to the damaged and unreinforced conditions. Besides, this technique potentially appears fully sustainable, because it is cheap, compatible, reversible, fire, and chemical resistant, it improves but not replaces original materials and, finally, it does not substantially use synthetic adhesives. All these reasons make this novel application of BF ropes fully sustainable and specialized to architectural heritage restoration.

A simple projection moiré system to measure displacements of aircraft structures

2007 ◽  
Vol 42 (6) ◽  
pp. 477-495 ◽  
Author(s):  
U Galietti ◽  
K Genovese ◽  
L Lamberti ◽  
D Posa
Keyword(s):  
Analytical Model ◽  
Large Scale ◽  
Industrial Applications ◽  
Processing Method ◽  
Simple Analytical Model ◽  
Aerodynamic Loads ◽  
Out Of Plane ◽  
Plane Displacement ◽  
Good Agreement ◽  
Projection Moire

This work presents a simple projection moiré system (PMS) to measure displacements of large-scale aeronautical components. The system includes standard optics, uses a standard fringe-processing method, and relies on a simple analytical model to recover topographic information. An extensive calibration campaign, based on design of experiments, is conducted in order to find the best analytical model for retrieving the out-of-plane displacement field from the moiré pattern and to find the optimal combination of parameters involved in the measurement system. In order to check the suitability of the present PMS device for practical industrial applications, distortions induced by aerodynamic loads on a landing-light glazing of an Airbus A340 are measured. Experimental results are in good agreement with other measurements carried out independently.

Out-of-plane seismic performance of plasterboard partition walls via quasi-static tests

2016 ◽  
Vol 49 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Crescenzo Petrone ◽  
Gennaro Magliulo ◽  
Pauline Lopez ◽  
Gaetano Manfredi
Keyword(s):  
Seismic Performance ◽  
Bending Moment ◽  
Structural Elements ◽  
Nonstructural Components ◽  
Static Tests ◽  
Static Test ◽  
Cyclic Behaviour ◽  
Testing Protocol ◽  
Partition Walls ◽  
Out Of Plane

Internal partitions, as many nonstructural components, should be subjected to a careful and rational seismic design, as is done for structural elements. A quasi-static test campaign aimed at the evaluation of the out-of-plane seismic performance of Siniat plasterboard internal partitions with steel studs was conducted according to FEMA 461 testing protocol. Four tall, i.e. 5 m high, specimens were selected from the range of internal partitions developed in Europe by Siniat, a leading supplier of plasterboard components in Europe. Under the specified testing protocol, a significant nonlinear pinched behaviour of the tested specimen was observed. The pinched behaviour was caused by the damage in the screwed connections, whose cyclic behaviour was strongly degrading. Both stiffness and strength of the specimens are significantly influenced by the board typology and the amount of screwed connections. Finally, it was concluded that Eurocodes significantly underestimate the resisting bending moment of the tested specimens.

Seismic Strength of Reinforced Multi-Storey Masonry Walls

2014 ◽  
Vol 624 ◽  
pp. 19-26 ◽  
Author(s):  
Mario Como
Keyword(s):  
Seismic Behavior ◽  
Fiber Reinforced Polymers ◽  
Weak Links ◽  
Masonry Walls ◽  
Masonry Buildings ◽  
Structural Components ◽  
Force Transmission ◽  
Full Understanding ◽  
Reinforced Polymers ◽  
Out Of Plane

Analysis of force transmission through the various structural components is needed to the full understanding of the seismic behavior of masonry buildings. It is in fact necessary to identify the weak links of the chain and define the essential reinforcements to insert in the structure. In this context the Paper analyzes the strengths of masonry walls under the action of out of plane and in plane horizontal forces and compares the systems of reinforcement of the walls that can use steel or Fiber Reinforced Polymers (FRP).

Out-Of-Plane Behavior of Confined Masonry Walls Subjected to Concentrated Loads (One-Way Bending)

2016 ◽  
Vol 32 (4) ◽  
pp. 2317-2335 ◽  
Author(s):  
Dante Navarrete-Macias ◽  
Jorge Varela-Rivera ◽  
Luis Fernandez-Baqueiro
Keyword(s):  
Aspect Ratio ◽  
Seismic Behavior ◽  
Axial Stress ◽  
Experimental Results ◽  
Masonry Walls ◽  
Cyclic Loads ◽  
Wall Panel ◽  
Confined Masonry ◽  
Plastic Analysis ◽  
Out Of Plane

This paper presents the results of a study on the out-of-plane seismic behavior of confined masonry walls. Five confined walls were tested under reverse cyclic loads. The variables studied were the axial stress and the wall aspect ratio. Analytical out-of-plane strength of walls was calculated considering the strengths of the wall panel and the concrete confining elements. The former was determined using the unidirectional strut method and the latter using a plastic analysis. It was observed that for walls with the same aspect ratio, as the axial stress increases, the out-of-plane strength increases. For walls with the same axial stress, as the aspect ratio increases, the strength decreases. Based on comparisons between analytical and experimental results, it was concluded that the models developed in this work predict accurately the out-of-plane strength of the walls.

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