scholarly journals AUTHOR'S METHOD OF CONTINUUM STATES ON THE EXAMPLE OF IMPERFECTION IN THE CONSTRUCTION OF A LARGE-PANEL BUILDING

2020 ◽  
Author(s):  
Piotr Bieranowski
Keyword(s):  
Reinforced Concrete ◽  
Shell Model ◽  
Computer Analysis ◽  
Building Construction ◽  
Communication Structure ◽  
Static Work ◽  
Wall Model ◽  
Continuum States ◽  
Large Panel ◽  
First Time

The paper presents the results of FEM computer analysis regarding cracking of the wall prefabricated element. The proprietary coating model of the Wk-70 System large-panel building construction was used. For analysis, a construction diaphragm has been separated that is integrally connected to the vertical communication structure. Modeled through the scratch in the attic wall and compared with the wall model without damage. By building the shell model, a real and transparent picture of the static work of the structure was obtained, distinguishing zones: focus, redistribution, compensation and neutralization of stresses, whose genesis results from imperfection - scratches in a reinforced concrete composite. For the first time, the author introduces his own method of assessing the safety status of large-panel buildings - by the States Continuum Method.

scholarly journals Application of Hyperelastic Nodal Force Method to Evaluation of Aortic Valve Cusps Coaptation: Thin Shell vs. Membrane Formulations

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1450
Author(s):  
Yuri Vassilevski ◽  
Alexey Liogky ◽  
Victoria Salamatova
Keyword(s):  
Aortic Valve ◽  
Finite Elements ◽  
Shell Model ◽  
Thin Shell ◽  
Aortic Valves ◽  
Shear Moduli ◽  
Force Method ◽  
Elastic Potentials ◽  
Shell Analysis ◽  
First Time

Coaptation characteristics are crucial in an assessment of the competence of reconstructed aortic valves. Shell or membrane formulations can be used to model the valve cusps coaptation. In this paper we compare both formulations in terms of their coaptation characteristics for the first time. Our numerical thin shell model is based on a combination of the hyperelastic nodal forces method and the rotation-free finite elements. The shell model is verified on several popular benchmarks for thin-shell analysis. The relative error with respect to reference solutions does not exceed 1–2%. We apply our numerical shell and membrane formulations to model the closure of an idealized aortic valve varying hyperelasticity models and their shear moduli. The coaptation characteristics become almost insensitive to elastic potentials and sensitive to bending stiffness, which reduces the coaptation zone.

scholarly journals Analyzing of Coatings on Steel - Reinforced Concrete Elements by Mobile NMR

2016 ◽  
Vol 62 (1) ◽  
pp. 65-82 ◽  
Author(s):  
J. Orlowsky
Keyword(s):  
Reinforced Concrete ◽  
Potential Effect ◽  
Building Site ◽  
Steel Reinforced Concrete ◽  
Mobile Nmr ◽  
The Individual ◽  
First Time ◽  
Concrete Elements ◽  
Non Destructive

Abstract A large number of infrastructural concrete buildings are protected against aggressive environments by coating systems. The functionality of these coating systems is mainly affected by the composition and thickness of the individual polymeric layers. For the first time ever, a mobile nuclear magnetic resonance (NMR) sensor allows a non-destructive determination of these important parameters on the building site. However, before this technique can be used on steel-reinforced concrete elements, the potential effect of the reinforcement on the measurement, i.e. the NMR signal, needs to be studied. The results show a shift of the NMR profile as well as an increase of the signals amplitude in the case of the reinforced samples, while calculating the thickness of concrete coating leading to identical results.

In-Plane Force Effect of Reinforced Concrete Beam with Elastic Supports

2011 ◽  
Vol 287-290 ◽  
pp. 1896-1901
Author(s):  
Zhi Kun Guo ◽  
Wan Xiang Chen ◽  
Qi Fan Wang ◽  
Yu Huang ◽  
Chao Pu Li ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Nonlinear Characteristics ◽  
Elastic Supports ◽  
Calculation Results ◽  
Basic Equations ◽  
First Time ◽  
Good Agreement

The bearing capacities of one-way reinforced concrete beams with elastic supports are investigated in this paper. According to the nonlinear characteristics of the beams, the basic equations based on plastic theory of concrete are derived by considering the in-plane force effects that aroused by the constraints of supports when the beams deforming. It is indicated that the calculation results are in good agreement with experimental datum, and the influences of different supports on the bearing capacities of the beams are quantitatively given for the first time.

A Research on Key Technology in Overturn-Preventing of Longxi Tower’s Monolithic Movement

2014 ◽  
Vol 548-549 ◽  
pp. 1810-1814
Author(s):  
Dong Fan Shang ◽  
Tie Cheng Wang ◽  
Zhi Feng Yang
Keyword(s):  
Reinforced Concrete ◽  
Safety Factor ◽  
Support System ◽  
Time Shift ◽  
Protection Measures ◽  
Key Technology ◽  
Base Area ◽  
Protective Tube ◽  
Small Base ◽  
First Time

Longxi Tower is the first time shift of pagoda relics in China. All the following factors increase the difficulty of the shift: long years’ construction, serious aging of its structure, poor integrity, small base area and great height. In the process, we used steel initiative urging support system and reinforced concrete protective tube for Longxi Tower’s reinforcement protection, so as to form a stable entirety. Compared to no protection measures, overturn-preventing calculations and further reinforce protection measures improved the safety factor 6.0 times, thus greatly improving the overturn-preventing ability of Longxi Tower.

Description of Continuum States within the No-Core Shell Model: Single-State HORSE Method

2019 ◽  
Vol 82 (5) ◽  
pp. 537-548
Author(s):  
A. I. Mazur ◽  
A. M. Shirokov ◽  
I. A. Mazur ◽  
L. D. Blokhintsev ◽  
Y. Kim ◽  
...  
Keyword(s):  
Shell Model ◽  
Core Shell ◽  
Continuum States ◽  
Single State

FIRST γ-RAY SPECTROSCOPY AND ISOSPIN SYMMETRY STUDY OF THE N = Z - 2 NUCLEUS 44V

2010 ◽  
Vol 25 (21n23) ◽  
pp. 2028-2029 ◽  
Author(s):  
M. J. TAYLOR ◽  
M. A. BENTLEY ◽  
J. BROWN ◽  
R. WADSWORTH ◽  
P.E. KENT ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Shell Model ◽  
Excited States ◽  
State Of The Art ◽  
Isospin Symmetry ◽  
Charge Symmetry Breaking ◽  
Charge Symmetry ◽  
Model Calculations ◽  
Γ Ray ◽  
First Time

Excited states in the Tz = -1 nucleus 44 V have been observed for the first time. The states have been identified through recoil-γ-γ coincidences and comparison with analogue states in the mirror nucleus 44 Sc . Mirror energy differences have been extracted and compared to state-of-the-art fp shell-model calculations which include charge symmetry breaking forces.

scholarly journals Computer Analysis of Thermomechanical State of Sealing Steel Lining for Containment of NPPs with VVER-1000/V-320 in Emergencies

2017 ◽  
pp. 28-39 ◽  
Author(s):  
O. Gondliakh ◽  
V. Krytskyi ◽  
V. Onopriienko ◽  
A. Chemerys ◽  
N. Krytska
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Computer Analysis ◽  
Stress Strain ◽  
Steel Lining ◽  
Strain Parameter ◽  
Temperature And Pressure ◽  
Extreme Hazards ◽  
Evolution Function

Computer analysis of thermomechanical state of the sealing steel lining under relevant extreme hazards has been performed to define the possibility and scope of loss of integrity of sealing steel lining, in particular the possibility of losing of the confining function by the NPP reactor compartment containment under emergency conditions. The study gave an opportunity to obtain functions of stress strain parameter evolution function in reinforced concrete and sealing steel lining depending on changes in emergency temperature and pressure in the reactor compartment. The paper assessed the margin of sealing steel lining bearing capacity.

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