scholarly journals Research on the Inspection Method of Chimney Appearance and Masonry Material Performance

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Fei Sun
Keyword(s):  
Public Concern ◽  
Inspection Method ◽  
Load Bearing ◽  
High Rise ◽  
Relevant Reference ◽  
Masonry Material ◽  
Bearing Materials ◽  
Damage Condition

As a high-rise structure, the safety of chimneys has always been a public concern. In this paper, the damage condition, tilting, and the strength of load-bearing materials of the chimney were inspected, and the inspection conclusions and maintenance suggestions were given based on the inspection results. The inspection method can provide relevant reference for the inspection of similar structures.

scholarly journals Reliability as a Key Driver for a Sustainable Design of Adaptive Load-Bearing Structures

2022 ◽  
Vol 14 (2) ◽  
pp. 895
Author(s):  
Dshamil Efinger ◽  
Andreas Ostertag ◽  
Martin Dazer ◽  
David Borschewski ◽  
Stefan Albrecht ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Construction Materials ◽  
Internal Stresses ◽  
Elastic Model ◽  
Load Spectrum ◽  
Operating Life ◽  
Load Bearing ◽  
Linear Elastic ◽  
High Rise ◽  
Bearing Structure

The consumption of construction materials and the pollution caused by their production can be reduced by the use of reliable adaptive load-bearing structures. Adaptive load-bearing structures are able to adapt to different load cases by specifically manipulating internal stresses using actuators installed in the structure. One main aspect of quality is reliability. A verification of reliability, and thus the safety of conventional structures, was a design issue. When it comes to adaptive load-bearing structures, the material savings reduce the stiffness of the structure, whereby integrated actuators with sensors and a control take over the stiffening. This article explains why the conventional design process is not sufficient for adaptive load-bearing structures and proposes a method for demonstrating improved reliability and environmental sustainability. For this purpose, an exemplary adaptive load-bearing structure is introduced. A linear elastic model, simulating tension in the elements of the adaptive load-bearing structure, supports the analysis. By means of a representative local load-spectrum, the operating life is estimated based on Woehler curves given by the Eurocode for the critical notches. Environmental sustainability is increased by including reliability and sustainability in design. For an exemplary high-rise adaptive load-bearing structure, this increase is more than 50%.

Timber-concrete composite frame joint for high-rise buildings

2019 ◽  
Author(s):  
Tim Höltke ◽  
Achim Bleicher
Keyword(s):  
High Strength ◽  
Specific Weight ◽  
Modular Construction ◽  
Renewable Materials ◽  
Load Bearing ◽  
Laminated Veneer Lumber ◽  
High Rise ◽  
Composite Frame ◽  
Composite Joint ◽  
First Results

<p>Timber is one of the few renewable materials that improves its structural properties when combined with concrete. The composite of timber and concrete increase stiffness and fire protection, unlike timber when used alone. In contrast to concrete structures, timber-concrete composite (TCC) structures reduce the carbon footprint and the specific weight of a building. At the Chair of Hybrid Structures - Structural Concrete of BTU Cottbus-Senftenberg a moment-resistant TCC joint was developed for multi-story frames, which can be used as a structural system for high-rise buildings. Facts like a modular construction, a fast assembly and a plug-in connection were aspects that shaped the development. A high rotational stiffness and load-bearing at the composite joint was also achieved using high strength beech laminated veneer lumber (LVL).</p><p>The TCC frame works on its own and in combination with other bracing systems. Initial investigations on the load-bearing behavior were carried out using numerical analysis followed by experiments on real-sized joints in further studies. First results will be presented in this paper. The developed TCC joint as part of structural systems offers a high variability and can thus contribute to tomorrow’s sustainable vertical growth of cities.</p>

Influence of the Load-Bearing System of a High-Rise Building on its Stiffness

2015 ◽  
Vol 769 ◽  
pp. 29-35
Author(s):  
Olga Ivankova ◽  
Lenka Konecna
Keyword(s):  
Dynamic Analysis ◽  
Seismic Event ◽  
Short Description ◽  
Load Bearing ◽  
Static And Dynamic Analysis ◽  
High Rise ◽  
Wall System ◽  
Bearing System ◽  
Computing Models ◽  
Storey Building

Static and dynamic analysis of the high-rise (24-storey) building is discussed in this paper. The influence of the change of load-bearing system on its stiffness in the case of seismic event was detected. Two different load-bearing systems were chosen – the wall system (alt.1) and the skeleton system (alt.2). Finite element method was used for the solution of 3D computing models. Short description of the building, used material, applied load, a type of the subsoil and obtained results are mentioned. Dynamic analysis was repeated for four various seismic areas in Slovakia.

scholarly journals Risk management at the stage of design of high-rise construction facilities

2018 ◽  
Vol 33 ◽  
pp. 03042
Author(s):  
Violetta Politi
Keyword(s):  
Risk Management ◽  
Construction Process ◽  
Conditional Probabilities ◽  
Safety Level ◽  
Load Bearing ◽  
Safety Requirements ◽  
High Rise ◽  
The Relationship ◽  
Probabilistic Risk

This paper describes the assessment of the probabilistic risk of an accident formed in the process of designing a technically complex facility. It considers values of conditional probabilities of the compliance of load-bearing structures with safety requirements, provides an approximate list of significant errors of the designer and analyzes the relationship between the degree of compliance and the level of danger of errors. It describes and proposes for implementation the regulated procedures related to the assessment of the safety level of constructive solutions and the reliability of the construction process participants.

EFFECT OF LOAD BEARING MATERIALS ON SUSCEPTIBILITY TO BIOFILMS GROWTH

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Václav Kočí ◽  
Jiří Maděra
Keyword(s):  
Thermal Conditions ◽  
Point Of View ◽  
Climatic Data ◽  
Load Bearing ◽  
Autoclaved Aerated Concrete ◽  
Bearing Materials ◽  
Heat And Moisture Transport ◽  
Aerated Concrete ◽  
Coupled Heat And Moisture ◽  
Heat And Moisture

Preventing a biofilms growth on exterior facades of buildings is one of the ways how to preserve the original buildings appearance and thus their proper aesthetical function. Since the biofilms growth is strongly conditioned by the hygric and thermal conditions on the surface, a proper hygrothermal performance and interactions between materials involved is essential. This paper studies an impact of load bearing material on surface conditions on a lime-cement plaster from the point of view of susceptibility to biofilms growth. An influence of autoclaved aerated concrete, solid brick and sandstone is studied when exposed to dynamic boundary conditions in form of reference climatic data. Being obtained using computational modeling of coupled heat and moisture transport, the results revealed a substantial influence in that respect. The best performance exhibited the autoclaved aerated concrete as the duration of convenient conditions for biofilms growth was lower by 40% when compared to solid brick and sandstone.

scholarly journals Calculation of PVC windows for wind loads in high-rise buildings

2018 ◽  
Vol 33 ◽  
pp. 02025 ◽  
Author(s):  
Aleksandr Konstantinov ◽  
Maya Lambias Ratnayake
Keyword(s):  
Analytical Method ◽  
Calculation Method ◽  
Laboratory Experiments ◽  
Wind Loads ◽  
Statistical Characteristics ◽  
Statistical Calculation ◽  
Load Bearing ◽  
High Rise ◽  
The Impact ◽  
Window Design

In the following article we examine problems faced when designing PVC windows for high-rise buildings, which are usually not considered when constructing objects for massive sites, using a high-rise residential complex as an example. We address the matters related to wind loads on windows & statistical calculation of the impact of wind loads on them. We have presented variants of installing load-bearing elements of PVC windows which accept wind loads. We conducted a laboratory experiment by simulating wind loads on the window design, which is actually used for glazing the examined high-rise building. In the course of the experiment we determined additional factors which need to be considered when constructing PVC window structures for glazing high-rise buildings. We can determine that the following calculation method for the impact of wind load on PVC windows gives higher values of the desired statistical characteristics of load-bearing elements of a window compared to the results of laboratory experiments. We provide prerequisites to improve the analytical method of calculating impact of wind loads on load-bearing elements of PVC windows.

scholarly journals On the design of high-rise buildings with a specified level of reliability

2018 ◽  
Vol 33 ◽  
pp. 02061 ◽  
Author(s):  
Andrey Dolganov ◽  
Pavel Kagan
Keyword(s):  
Steel Structures ◽  
Optimal Level ◽  
Structural Scheme ◽  
Load Bearing ◽  
Metal Structures ◽  
High Rise ◽  
Regulatory Documents ◽  
Long Time ◽  
Seismic Impacts ◽  
Different Levels

High-rise buildings have a specificity, which significantly distinguishes them from traditional buildings of high-rise and multi-storey buildings. Steel structures in high-rise buildings are advisable to be used in earthquake-proof regions, since steel, due to its plasticity, provides damping of the kinetic energy of seismic impacts. These aspects should be taken into account when choosing a structural scheme of a high-rise building and designing load-bearing structures. Currently, modern regulatory documents do not quantify the reliability of structures. Although the problem of assigning an optimal level of reliability has existed for a long time. The article shows the possibility of designing metal structures of high-rise buildings with specified reliability. Currently, modern regulatory documents do not quantify the reliability of high-rise buildings. Although the problem of assigning an optimal level of reliability has existed for a long time. It is proposed to establish the value of reliability 0.99865 (3σ) for constructions of buildings and structures of a normal level of responsibility in calculations for the first group of limiting states. For increased (construction of high-rise buildings) and reduced levels of responsibility for the provision of load-bearing capacity, it is proposed to assign respectively 0.99997 (4σ) and 0.97725 (2σ). The coefficients of the use of the cross section of a metal beam for different levels of security are given.

scholarly journals A BIM-Based Framework and Databank for Reusing Load-Bearing Structural Elements

2020 ◽  
Vol 12 (8) ◽  
pp. 3147 ◽  
Author(s):  
Ingrid Bertin ◽  
Romain Mesnil ◽  
Jean-Marc Jaeger ◽  
Adélaïde Feraille ◽  
Robert Le Roy
Keyword(s):  
Calculation Model ◽  
Information Modeling ◽  
Embodied Energy ◽  
Load Bearing ◽  
High Rise ◽  
Building Information ◽  
Structural Calculation ◽  
A Chain ◽  
Structural Engineers

In a context of intense environmental pressure where the construction sector has the greatest impact on several indicators, the reuse of load-bearing elements is the most promising by avoiding the production of waste, preserving natural resources and reducing greenhouse gas emissions by decreasing embodied energy. This study proposes a methodology based on a chain of tools to enable structural engineers to anticipate future reuse. This methodology describes the design of reversible assemblies, the addition of complementary information in the building information modeling (BIM), reinforced traceability, and the development of a material bank. At the same time, controlling the environmental impacts of reuse is planned by carrying out a life cycle assessment (LCA) at all stages of the project. Two scenarios for reuse design are applied with the toolchain proposed. A. “design from a stock” scenario, which leads to 100% of elements being reused, using only elements from stock. B. “design with a stock” scenario, which seeks to integrate as many reused elements available in the stock as possible. The case study of a high-rise building deconstructed to rebuild a medium-rise building demonstrated that the developed toolchain allowed the inclusion of all reuse elements in a new structural calculation model.

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