scholarly journals Optimization of Load-Bearing concrete Wall Using Genetic Algorithm To achieve Mechanically Integrated Behavior

2020 ◽  
Vol 974 ◽  
pp. 012011
Author(s):  
Sara N. Elkabany ◽  
Ahmed M. Elkordy ◽  
Hesham A. Sobh
Keyword(s):  
Genetic Algorithm ◽  
Concrete Wall ◽  
Load Bearing

Carbon Fiber Strips Retrofitting System for Precast Reinforced Concrete Wall Panel

2015 ◽  
Vol 660 ◽  
pp. 208-212 ◽  
Author(s):  
Mihai Fofiu ◽  
Andrei Bindean ◽  
Valeriu Stoian
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Maximum Load ◽  
Fiber Reinforced Polymers ◽  
Wall Panel ◽  
Concrete Wall ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Reinforced Concrete Wall

This paper presents the retrofitting procedure used on a precast reinforced concrete wall panel (PRCWP) in order to restore its initial load bearing capacity. The specimen used in this experimental test is one from the residential multistoried buildings constructed in Romania from the 1970 onwards. All of the characteristics of the element are from the specific era, only scaled down with a factor of 1:1,2. The element was subjected to in-plane reversed cyclic loading to simulate its seismic behavior and obtain its maximum load bearing capacity. After the test we retrofitted the element using Carbon Fiber Strips Externally Bonded (EBR) and anchored with Carbon Fiber Reinforced Polymers (CFRP) mesh. The porpoise of the paper is to compare the maximum loading bearing capacity of the unstrengthen and strengthen elements in order to compare them and examine the efficiency of this retrofitting procedure.

scholarly journals Assessment on Embodied Energy of Non-Load Bearing Walls for Office Buildings

Buildings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 79
Author(s):  
Sanaz Salehian ◽  
Muhammad Azzam Ismail ◽  
Ati Rosemary Mohd Ariffin
Keyword(s):  
Case Studies ◽  
Greenhouse Gas Emission ◽  
Embodied Energy ◽  
Office Buildings ◽  
Concrete Wall ◽  
Curtain Wall ◽  
Load Bearing ◽  
Important Player ◽  
Building Wall ◽  
Materials Used

Two important factors that have been put in the limelight in the current age are environmental concerns and sustainable future. The building sector has emerged as an important player in this matter due to their contribution into the large share of resources and energy consumption as well as harmful greenhouse gas emission. This paper discusses the percentage of embodied energy (EE) in two common building wall materials in Malaysia: steel and concrete. Concrete is used in concrete non-load bearing walls and steel is used to manufacture curtain walls. Although there are more materials used in the selected case studies, steel and concrete possess the high amount of embodied energy. Thus, the concrete wall and curtain wall in the lifecycle analysis (LCA) pre-use phase in high-rise office buildings in Malaysia are considered in this research. GaBi software is used to evaluate and calculate embodied energy in the case studies. The functional unit for this LCA study is determined as one cubic meter of concrete non-load bearing wall and curtain wall. In order to determine the components included in the analysis, input-output flowcharts are created for each process. The comparison of these walls shows that curtain wall has more embodied energy than concrete. The highest amount of embodied energy in curtain wall construction for case B is 4873.89 MJ, and for the case A is 4851.09 MJ approximately. The amount of EE in the concrete non-load bearing wall for both case studies are the lowest amount, with 278.85 MJ for case A and 280.66 MJ for case B. Results also show that the manufacturing of materials is the biggest contribution to the amount of EE at more than 50%, whereas transportation is between 1.83% and 3.77% only.

BUCKLING OF STEEL FIBRE EXPANDED POLYSTYRENE CONCRETE WALL PANEL

2015 ◽  
Vol 76 (10) ◽  
Author(s):  
Rohana Mamat ◽  
Siti Hawa Hamzah ◽  
Jamilah Abd. Rahim
Keyword(s):  
Steel Fibre ◽  
Lightweight Concrete ◽  
Slenderness Ratio ◽  
Expanded Polystyrene ◽  
Sustained Load ◽  
Wall Panel ◽  
Concrete Wall ◽  
Maximum Displacement ◽  
Load Bearing ◽  
Wall Panels

Steel Fibre Expanded Polystyrene Concrete (SFEPS) wall panel is envisaged as load bearing walls, although it is lightweight by design. The performance of this wall is investigated, incorporating opening to fulfil the demand for ventilation and services conduits or equipments. It focused on the buckling behaviour by comparing the carrying load capacities and deformation profiles of wall panel with and without opening. Primarily, the samples were cast from concrete mixed with expanded polystyrene (EPS) beads, enhanced with hooked end round shaft steel fibre and reinforced with a single layer rectangular steel fabric (BRC) of size B9. The wall panel size is 2000 mm in height (limited due to testing frame allowable height), 1500 mm wide and 100 mm thick which gives the slenderness ratio of 15. The wall falls under the slender wall category for lightweight concrete since the slenderness ratio is greater than 10 [1]. A central opening with a size of 600 mm high by 600 mm wide is created to accommodate the opening criterion. Experimental tests were conducted simulating fixed ends condition. The average compressive strength of SFEPS, fcu is 20.87 N/mm2 with a density, ρ of 1900 kg/m3. These lightweight SFEPS wall panels sustained load between 958.0 kN and 1938.9 kN. Wall panels experienced maximum displacement of 22.3 mm at midheight. The wall panels failed in buckling as it should be for slender wall. There was also concrete crushing at the upper and lower ends of the panels. The SFEPS wall panel is suitable to be used as load bearing structures.

Shape Synthesis for Skeletal Structures Using а Genetic Algorithm and Delaunay Tetrahedron Partition

2015 ◽  
Vol 736 ◽  
pp. 134-139
Author(s):  
Anatoliy Victorovich Alekseytsev ◽  
Natalia Sergeevna Kurchenko
Keyword(s):  
Genetic Algorithm ◽  
Minimum Weight ◽  
Fixed Number ◽  
Evolutionary Modeling ◽  
Suggested Approach ◽  
Load Bearing ◽  
Skeletal Structures ◽  
Modified Genetic Algorithm ◽  
Rod System

Method of searching for rational shapes of skeletal structures based on the use of Delaunay tetrahedron partition algorithms with constraints and evolutionary modeling has been developed. Topology of load-bearing rod system is synthesized on specified multitude of nodes at fixed number of rods. Established structures are considered redundant and are optimized by means of excluding individual members. Optimization is performed with the modified genetic algorithm pursuant to criterion of minimum weight of structure. An example of synthesis of rectangular rod structure showing performance of suggested approach in terms of shape synthesis of trusses has been given.

scholarly journals Structure Design and Kinematics Analysis of a Novel Unpowered Load-Carrying Lower Extremity Exoskeleton with Parallel Topology

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Qiang Yan ◽  
Jianjun Zhang ◽  
Kaicheng Qi
Keyword(s):  
Genetic Algorithm ◽  
Lower Extremity ◽  
Structure Design ◽  
Schematic Diagram ◽  
Static Force ◽  
The Novel ◽  
Kinematics Analysis ◽  
Force Analysis ◽  
Load Bearing ◽  
Load Carrying

A novel unpowered load-carrying parallel lower extremity exoskeleton is proposed. It is aimed at enhancing the load-bearing ability of the operator. Firstly, the structure of the novel exoskeleton is depicted in the second section; meanwhile, the degree of freedom concerning the exoskeleton is gotten by analyzing the number of links and the kinematic joints. Secondly, the forward position analysis of the exoskeleton for the swing leg is obtained. Using the expressions concerning the joints of knee and angle, the workspace of the swing leg in supporting gait circle is analyzed by the software of MATLAB. Thirdly, according to the schematic diagram of the mechanism, the static force analysis of the supporting leg for the exoskeleton is obtained. Finally, the static force of the supporting leg of the person who is not wearing the unpowered exoskeleton is gotten. Meanwhile, the genetic algorithm is used to get the optimum stiffness of the spring for energy-restoring device. By comparing the changes of force and torque for the supporting leg who is not wearing it and the skeleton which is worn by a person, some conclusions are carried out.

Optimisation analysis of reinforced cable distribution on the airship

2021 ◽  
pp. 1-10
Author(s):  
H. Zhao ◽  
Z. Chen ◽  
J. Chen
Keyword(s):  
Genetic Algorithm ◽  
Parametric Model ◽  
Structure Design ◽  
Total Weight ◽  
Secondary Development ◽  
Light Weight ◽  
Nsga Ii ◽  
Load Bearing ◽  
Engineering Significance ◽  
Load Analysis

Abstract Reinforced cables are usually installed on flexible airship structures to enhance their load-bearing capability. However, reinforced cables also increase the total weight of the airship. In order to find a balance between large loading-bear capability and light weight, a multi-objective optimisation scheme based on the genetic algorithm NSGA-II is put forward for the reinforced cable distribution on the airship. Firstly, different cable distribution schemes are presented according to engineering experience and the optimal one is determined by load analysis. Then, the CAE method and optimisation analysis are combined to achieve structure design optimisation. The parametric model of the airship structure with reinforced cables is established by ABAQUS secondary development and the load analysis is carried out. Parameter passing and optimisation algorithm are operated by Isight software and the optimisation analysis is conducted based on the NSGA-II algorithm. Finally, we draw some conclusions of the rules of optimised reinforcing cable distribution. The work of this paper has crucial engineering significance for improving performance of the airship structure design.

scholarly journals Carbon Fiber Strengthening of Geopolymer Concrete Wall Panels with Iron Fillings

2018 ◽  
Vol 7 (4.20) ◽  
pp. 399
Author(s):  
Dr. Wissam K. Al-Saraj ◽  
Dr. Layth Abdulbari Al-Jaberi ◽  
Sahar J. AL-Serai ◽  
. .
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Alkaline Solutions ◽  
Strengthening Effect ◽  
Concrete Wall ◽  
Load Bearing ◽  
Lateral Deflection ◽  
Wall Panels ◽  
Reinforced Concrete Wall

Wall is a vertical plate member resisting vertical (in-plane) or lateral loads. Load-Bearing walls were referred to RC wall panels which were commonly used as load-bearing structural members, braced and laterally supported by the rest of the structure, local materials such as Metakaolin and alkaline solutions are used to cast (600x400) mm reinforced concrete wall panels with 40 mm thickness. To find the ultimate bearing capacity and lateral deflection of wall panels. Seven specimens are divided  in two groups to study the variation effect of iron filling (0, 0.5, 0.75 and  1.0)%   and carbon fiber (225, 125 and 90 )mm spacing center to center of strips.  The result shows that the maximum increasing are 17% and 14% for ultimate bearing capacity and cracking load of wall panels respectively, when iron filling is 1%. Also, the using of carbon fiber with 90 mm spacing center to center of strips leds to increasing in ultimate bearing capacity and cracking load by 31% and 7% respectively. Lateral deflection of wall panels was measured and compared with the reference wall to investigate the strengthening effect. 

Sign in / Sign up

Export Citation Format

Share Document