scholarly journals Numerical investigation of stability multi-storey buildings on weak ground based on their non-linearity

2021 ◽  
Vol 79 (1) ◽  
pp. 271-282
Author(s):  
A. I. Oleinik ◽  
◽  
K.M. Akhmedov ◽  
V.V. Shamov ◽  
◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Point Of View ◽  
Loss Of Stability ◽  
Bilinear Model ◽  
Soil Base ◽  
Nonlinear Formulation ◽  
High Rise ◽  
Weak Soils ◽  
Construction Mechanics ◽  
Base Structure

The problems of loss of stability and collapse of high-rise buildings located on weak soils are studied numerically. The problem is solved in a nonlinear formulation using a bilinear model of the soil base. From the point of view of construction mechanics, the critical state of the «ground base – structure» system is considered as an indifferent state. To solve this problem, the perturbation theory is used in combination with the method of successive loadings. Based on the results obtained, a variant of strengthening the foundation is proposed.

Note on Interference Effects in Two-Step Reaction Processes

1975 ◽  
Vol 53 (23) ◽  
pp. 2590-2592
Author(s):  
J. Cejpek ◽  
J. Dobeš
Keyword(s):  
Perturbation Theory ◽  
Point Of View ◽  
Order Perturbation ◽  
Interference Effects ◽  
Qualitative Explanation ◽  
First Order ◽  
One Step ◽  
Step Transition ◽  
Reaction Processes ◽  
First Order Perturbation

The reaction processes in which a one-step transition is forbidden are analyzed from the point of view of the first order perturbation theory. The interference between two competing two-step reaction paths is found to be always constructive. A qualitative explanation of the experimentally observed reaction intensities is presented.

scholarly journals INFLUENCE OF CREEP CONCRETE ON SPACE STABILITY THIN-WALLED DOME COVERINGS

2021 ◽  
Vol 1 (24) ◽  
Author(s):  
Ekaterina Prokshits ◽  
Sergey Gridnev ◽  
Olga Sotnikova ◽  
Iana Zolotukhina
Keyword(s):  
Theory Of Elasticity ◽  
Deformation Condition ◽  
Software Systems ◽  
Geometrical Parameters ◽  
Loss Of Stability ◽  
Construction Mechanics ◽  
Body Construction ◽  
Calculation Results ◽  
Load Action ◽  
Thin Walled

The task was set, due to the capabilities of modern software systems, to assess the effect of the increase in inelastic deformations under prolonged load action on the loss of stability of thin-walled dome coverings. The study of the dependences of the forms of the loss of stability of dome covering from creep concrete that will help further with optimization calculations when determining of the most influencing parameters of designs. Calculation results of thin-walled concrete dome roof of circular outline under the influence of operational loadings with use of two modern program complexes are given in article. It is investigated intense and deformation condition of dome coverings as a part of construction from position of forecasting of possible forms of loss of stability, with use of opportunities of the final and element «MidasCivil» computer system. In work provisions of the theory of elasticity, mechanics of deformation of solid body, construction mechanics and also methods of mathematical modeling based on application of finite element method are used. The received results give the chance to rationally select geometrical parameters and material of design and also to set structural strength safety factors at the solution of problems of stability of different covers taking into account possible creep of material.

scholarly journals Normalizability analysis of the generalized quantum electrodynamics from the causal point of view

2017 ◽  
Vol 32 (27) ◽  
pp. 1750165 ◽  
Author(s):  
R. Bufalo ◽  
B. M. Pimentel ◽  
D. E. Soto
Keyword(s):  
Perturbation Theory ◽  
Physical Model ◽  
Gauge Invariance ◽  
Quantum Electrodynamics ◽  
Lorentz Invariance ◽  
Point Of View ◽  
Inductive Method ◽  
S Matrix ◽  
Causal Approach

The causal perturbation theory is an axiomatic perturbative theory of the S-matrix. This formalism has as its essence the following axioms: causality, Lorentz invariance and asymptotic conditions. Any other property must be showed via the inductive method order-by-order and, of course, it depends on the particular physical model. In this work we shall study the normalizability of the generalized quantum electrodynamics in the framework of the causal approach. Furthermore, we analyze the implication of the gauge invariance onto the model and obtain the respective Ward–Takahashi–Fradkin identities.

Structural design of an over-track building with mid-story isolation

2021 ◽  
Author(s):  
Daiki Nakamizo ◽  
Seiya Kimura ◽  
Yuichi Koitabashi
Keyword(s):  
Urban Space ◽  
Structural Design ◽  
Point Of View ◽  
Transit Oriented Development ◽  
Structural Element ◽  
Basement Structure ◽  
Design Point ◽  
High Rise ◽  
Railway Operations ◽  
In Transit

<p>In order to use urban space effectively in Transit-Oriented Development (TOD), over-track buildings (built over railways), are becoming increasingly popular in Japan. From a construction and structural design point of view, the basement structure just beneath railways generally cannot be built while railway operations continue (interruption to operations is not permitted, In general).</p><p>This paper presents the structural design of a mid-story isolated high-rise building constructed over railways in Ikebukuro, Tokyo. The paper shows, not only the philosophy of the system, but also the structural design, full-scale experiments, and evaluation of the performance in each structural element. The authors believe that such a structural design will be one of the effective solutions to the over-track building.</p>

scholarly journals Towards an algorithmic synthesis of thermofluid systems

2020 ◽  
Author(s):  
Jonas B. Weber ◽  
Michael Hartisch ◽  
Alexander D. Herbst ◽  
Ulf Lorenz
Keyword(s):  
Heat Transfer ◽  
Design Process ◽  
Practical Experience ◽  
Point Of View ◽  
Fluid Distribution ◽  
Develop Model ◽  
Mathematical Methods ◽  
High Rise ◽  
Fluid Systems ◽  
Technical Systems

Abstract Individual technical components are usually well optimized. However, the design process of entire technical systems, especially in its early stages, is still dominated by human intuition and the practical experience of engineers. In this context, our vision is the widespread availability of software tools to support the human-driven design process with the help of modern mathematical methods. As a contribution to this, we consider a selected class of technical systems, so-called thermofluid systems. From a technical point of view, these systems comprise fluid distribution as well as superimposed heat transfer. Based on models for simple fluid systems as extensively studied in literature, we develop model extensions and algorithmic methods directed towards the optimized synthesis of thermofluid systems to a practical extent. Concerning fluid systems, we propose a Branch-and-Bound framework, exploiting problem-specific characteristics. This framework is then further analyzed using the application example of booster stations for high-rise buildings. In addition, we demonstrate the application of Quantified Programs to meet possible resilience requirements with respect to the systems generated. In order to model basic thermofluid systems, we extend the existing formulation for fluid systems by including heat transfer. Since this consideration alone is not able to deal with dynamic system behavior, we face this challenge separately by providing a more sophisticated representation dealing with the temporal couplings that result from storage components. For the considered case, we further show the advantages of this special continuous-time representation compared to the more common representation using discrete time intervals.

Study on the Structural Floor Design of High-Rise Buildings

2012 ◽  
Vol 256-259 ◽  
pp. 1017-1021
Author(s):  
Ling Huang
Keyword(s):  
Thick Plate ◽  
Point Of View ◽  
Core Tube ◽  
High Rise ◽  
High Rise Building ◽  
Architectural Features ◽  
Small Height ◽  
Flat Beam ◽  
Floor System

There is a high-rise building whose main structure is framework - core tube. In order to meet the requirements for architectural features, the distance between the outer frame and the exterior wall of core tube is relatively small, therefore the floor structure program adopts a thick plate and wide flat beam floor system, and part floors of the upper structure adopt a thick plate and dark beam system. As wide flat beams (dark beams) have a small height and cannot form effective support for the floor, special analysis has been made on floors from the security point of view without considering the role of wide flat beams (dark beams). The floor system of this high-rise building has been analyzed and discussed with regard to bearing capacity, deformation, comfort and other aspects.

scholarly journals An overview and a WBS template for construction planning of mid-rise buildings

2020 ◽  
Vol 1 (2) ◽  
pp. 18-25 ◽  
Author(s):  
Jean Pierre Lukongo Ngenge ◽  
Fatemeh Nouban
Keyword(s):  
Point Of View ◽  
Construction Planning ◽  
Work Breakdown Structure ◽  
High Rise ◽  
Construction Step ◽  
Period Estimation ◽  
Proper Performance ◽  
Design And Construction

The construction of small houses was started many years before Christ, and the development of this field has led many architects and engineers to a higher level of buildings. Mainly the buildings in terms of height are classified into three types: low-, medium- and high-rise buildings. In this particular study, medium or med-rise buildings are investigated. Reaching the fully finished building stage is not easy, and it requires many steps. Taking into account the step-by-step tasks for proper performance completion, economical point of view, performance period estimation and other considerations, it is essential to organise (plan) the work before it starts accurately; that is why a work breakdown structure (WBS) template is vital in the planning, design and construction of buildings. In this paper, an overview and a WBS template for construction planning of the med-rise buildings are submitted. It was seen that for the successful construction of a mid-rise building, 14 steps are required prior completion, and among all steps, construction step takes more time for completion.

scholarly journals ANALYSIS OF EXAMPLES OF THE APPLICATION OF THE BIOCLIMATIC APPROACH TO COLOR SOLUTIONS IN HIGH-RISE BUILDINGS

2020 ◽  
pp. 223-232
Author(s):  
Olga Krivenko ◽  
Oksana Pylypchuk
Keyword(s):  
Energy Efficient ◽  
Environmental Parameters ◽  
Point Of View ◽  
Innovative Design ◽  
Structural Mechanism ◽  
Color Formation ◽  
High Rise ◽  
Architectural Styles ◽  
Natural Analogues

The challenge in the design of bioclimatic high-rise buildings is to return to a design that is compatible with the environment, climate. The purpose of the article is to analyze the means of color formation in living and inanimate nature, which can be used in color solutions for the facades of bioclimatic high-rise buildings to ensure their durability, regulate energy efficient and environmental parameters (thermoregulation, illumination, humidity). The need to analyze and research the bioclimatic trend in the design of modern high-rise buildings is based on the emergence of a significant number of implemented innovative design solutions. Such projects differ from each other in architectural styles, directions and means of implementing the bioclimatic approach, placement and interaction with the environment. The application of various natural mechanisms of color formation in nature is analyzed from the point of view of ensuring functional use in facade solutions of modern high-rise buildings. The main advantages of the pigment and structural mechanism of color formation to ensure thermal insulation of the building, durability of facade finishing while maintaining the quality of color solutions are determined. The results of the study made it possible to establish that today the use of the bioclimatic approach to the use of color in the facades of high-rise buildings determines new trends in the creation of eco-facades, based on the use of natural analogues and associated with the introduction of the latest design and technological solutions.

scholarly journals Influence of the sequence of erection of build-ings on the formation of the stress-strain state of the system «base-foundation-overhead structures»

2020 ◽  
pp. 32-44
Author(s):  
Liudmyla Skochko ◽  
Artem Shabaltun
Keyword(s):  
Strain State ◽  
Design Parameters ◽  
Soil Base ◽  
Stress Strain ◽  
High Rise ◽  
Stress Strain State ◽  
Subsequent Section ◽  
The Impact ◽  
Ground Structures ◽  
Formulation Of Problems

The influence of the order of construction of houses on the formation of the stress-strain state of the system "foundation-foundation-above-ground structures" is investigated For this purpose, several options for setting tasks for the phased construction of multi-section building sections are considered. With this in mind, it should be noted that the construction of each subsequent section has an impact on the built entirely or partially adjacent section. That is why this effect should be investigated to predict how serious this impact may be, and to draw appropriate constructive decisions. Thus, the main objectives of the study are: Creation of SEM without taking into account the stages of construction of the house; Calculation of a house with a phased loading of 5 floors. Taking into account changes in the order of construction of sections; Formation of SEM taking into account the sequence of erection of sections without including the sequence of erection of floors within the boundaries of the current section; Research of the impact of the calculation of sections of a multi-section building without and taking into account the summary of subsequent sections. The research of the impact of the sequence of construction and installation of the object will allow us to assess the stress-strain scheme at all stages of construction, so changes in the behavior of the scheme will be recorded at all stages of construction specified by the designers. To do this, the change in the stress-strain state (VAT) of the system "foundation - foundations - above-ground structures" must be modeled with different options for stages of construction, taking into account the real parameters of the soil base and so on. The interaction of piles in different zones of sections, the work of grids in the foundations of high-rise buildings are considered. The research was carried out with the help of numerical modeling of the system "foundation - foundations - aboveground constructions". The redistribution of forces in the piles depending on the formulation of problems on the stages of construction of sections and design parameters (location of piles in characteristic zones, the influence of the stiffness of the aboveground part on the redistribution of forces). Characteristic zones in the foundation are distinguished: they are central, lateral, angular and especially at the joints of adjacent sections. The redistribution of efforts between piles and a grid is revealed.  

scholarly journals UOSTAMIESČIO VIZUALINIO ĮVAIZDŽIO PLĖTROS GALIMYBĖS IR PROBLEMOS: AUKŠTYBINIŲ PASTATŲ IŠDĖSTYMO SPECIALIOJO PLANO RENGIMAS – SPRENDINIŲ KONKRETIZAVIMAS IR PASEKMIŲ VERTINIMAS/ POSSIBILITIES AND PROBLEMS IN THE FORMATION OF SEAPORT VISUAL IMAGE: SPECIAL PLAN OF HIGH-RISE BUILDINGS FOR KLAIPĖDA – CURRENT SITUATION AND CONCEPTION

2008 ◽  
Vol 32 (2) ◽  
pp. 71-85 ◽  
Author(s):  
Inesa Alistratovaitė
Keyword(s):  
Visual Image ◽  
Current Situation ◽  
Point Of View ◽  
City Development ◽  
High Rise ◽  
High Rise Building ◽  
City Structure ◽  
Definition Of ◽  
Two Stages ◽  
The City

The paper deals with issues of high-rise building development and contemporary problems related to the formation of city development vision in Lithuania. The analysis focuses on the possibilities and problems arising in the process of developing the Special Plan of high-rise building arrangement in Klaipėda in the formation of the visual image of the city. The methodology of this Plan is discussed by the author in two papers. The present paper is the first one and analyses two stages of the plan development. The first stage is the analysis of the current situation in Klaipėda and possibilities to introduce high-rise buildings into the city morphostructure. This stage comprises 7 aspects: evaluation of the territory development from the point of view of investment possibilities; historical development of the city structure; hierarchy of values of preserved territories; analysis of the territory planning documents regulating townscape formation; evaluation of visual peculiarities; definition of visual identity zones, analysis and evaluation of important mass view points as well as evolvents of views seen from them. The second stage of developing the Special Plan constitutes efforts to define the conception of high-rise buildings arrangement on a city scale, central part scale and old-town scale. Santrauka Straipsnis skirtas aukštybinės statybos plėtros klausimui ir su tuo susijusioms šiandieninėms miesto plėtros vizijos formavimo problemoms Lietuvoje. Nagrinėjamos Klaipėdos miesto vizualinio įvaizdžio plėtros galimybės ir problemos rengiant Klaipėdos miesto aukštybinių pastatų išdėstymo specialųjį planą (SP). Šio plano metodikai aptarti autorė numatė parengti du straipsnius. Šiame, pirmajame, liečiamos dvi plano rengimo stadijos. Pirmoji – tai esama Klaipėdos miesto būklė, galimybės miesto morfostruktūroje rastis aukštybiniams pastatams; jos aptarimas apima 7 aspektus – miesto teritorijos pagal investicines plėtros galimybes vertinimą; miesto struktūros istorinę raidą; saugomų teritorijų vertybinę hierarchiją; dokumentų sprendinių, turinčių įtakos miestovaizdžių formavimui, analizę; vizualinių ypatumų vertinimą; miesto vizualinio identiteto zonų nustatymą ir svarbiausių masinės apžvalgos taškų bei iš jų matomo vaizdo išklotinių tyrimą ir nustatymą. Antroji plano rengimo stadija – tai aukštybinių pastatų išdėstymo koncepcijos paieškos miesto mastu, centrinės dalies mastu ir senamiesčio mastu.

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