Coupling Effect of Nodal Deviation and Member Imperfection on Load-Carrying Capacity of Single-Layer Reticulated Shell

2020 ◽  
Vol 20 (3) ◽  
pp. 919-930
Author(s):  
Hui-jun Li ◽  
Yoshiya Taniguchi
Keyword(s):  
Carrying Capacity ◽  
Coupling Effect ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
Load Carrying

Effect of joint stiffness and size on stability of three-way single-layer cylindrical reticular shell

2020 ◽  
Vol 35 (3) ◽  
pp. 90-107
Author(s):  
Hui-jun Li ◽  
Yoshiya Taniguchi
Keyword(s):  
Carrying Capacity ◽  
Joint Stiffness ◽  
Single Layer ◽  
Shear Stiffness ◽  
Limit Load ◽  
Torsional Stiffness ◽  
Axial Stiffness ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Joint Shear

The main aim of the present article is to study the effect of joint stiffness and joint size on load-carrying capacity of single-layer cylindrical reticular shell. One normalized joint bending stiffness index κb and three proposed normalized indexes, that is, normalized joint axial stiffness κa, normalized joint shear stiffness κs, and normalized joint torsional stiffness κt, are used to evaluate the stiffness of joint. Through a large number of numerical computations, the main conclusions are summarized as follows: κb has a significant effect on limit load of reticular shell, and this effect has a close relationship to rise-to-span ratio of reticular shell. If κb is larger than 30, the joint can be treated as rigid joint. The relationship between the logarithm of κb and limit load of reticular shell can be expressed by the logistic formulation. Overall rigidity and load-carrying capacity of reticular shell are greatly influenced by joint axial stiffness. If κa is larger than 30, the effect of joint axial stiffness on load-carrying capacity of reticular shell is no longer obvious. Otherwise, the load-carrying capacity will be markedly reduced. The relation between the logarithm of κa and limit load of reticular shell can be fitted by the Dose–response formulation. The load-carrying capacity of reticular shell is also influenced by joint torsional stiffness and joint shear stiffness to some extent. The relation between the logarithm of κs and limit load can be fitted by the Asymptotic formulation. The effect of joint size on overall rigidity and limit load of reticular shell is evident and cannot be neglected. The limit load gradually decreases with the decrease in joint size, and there is an approximate linear relationship between limit load and joint size.

Stability of cable-supported spherical reticulated shell with tension members

2020 ◽  
Vol 35 (3) ◽  
pp. 69-79
Author(s):  
Zhen Lu ◽  
Hui-jun Li ◽  
Chao Wang
Keyword(s):  
Carrying Capacity ◽  
Single Layer ◽  
Buckling Analysis ◽  
Load Carrying Capacity ◽  
Geometric Imperfection ◽  
Tension Member ◽  
Load Carrying ◽  
Initial Geometric Imperfection ◽  
Asymmetric Load ◽  
Tension Members

The suspendome has been widely employed in large-span space structures in recent years, and it has stronger structural stiffness and higher load-carrying capacity than single-layer spherical reticulated shell. In general, it is negligible for enhancement of load-carrying capacity to integrate cables and struts into the inner ring of reticulated shell. Based on the suspendome structure, a new hybrid space structure system, namely, cable-supported reticulated shell with tension member, is proposed in this study. To elucidate and verify its feasibility, the buckling mode and buckling form are obtained by the eigenvalue buckling analysis and nonlinear buckling analysis using ANSYS package, respectively. Furthermore, to determine the optimal structural form, this article investigates the effect of the main ribbed strut length, the initial geometric imperfection, asymmetric load, pretension in cables, and the material nonlinearity on its stability. The result shows that the proposed new structural system is of high load-carrying capacity. Tension member integrated to cable-supported reticulated shell can effectively improve the overall stiffness and greatly reduce the deformation of spherical reticulated shell. The plastic failure shape occurs with the similar pattern. The instable region mainly occurs on the main ribs with tension members, and each main rib only has one local failure dimple. The load-carrying capacity is remarkably affected by the asymmetric load, the initial geometric imperfection, and material nonlinearity. Based on the parametric analyses, Type C is the optimal choice, that is, appending cables and struts to the outermost ring of single-layer spherical reticulated shell, and arranging out-of-plane tension members under the four main ribs.

Strengthening of Masonry Arches with FRCM Composites: A Review

2019 ◽  
Vol 817 ◽  
pp. 251-258
Author(s):  
Paolo Zampieri ◽  
Jaime Gonzalez-Libreros ◽  
Nicolò Simoncello ◽  
Carlo Pellegrino
Keyword(s):  
Construction Industry ◽  
Carrying Capacity ◽  
Steel Fiber ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
New Materials ◽  
Masonry Arches ◽  
Masonry Arch ◽  
Clay Bricks ◽  
Load Carrying

Research on the preservation and restoration of masonry arches is of interest for the scientific and civil engineering communities, and the construction industry. Among the open investigation topics in the field, the study of new materials for strengthening masonry arches has gained attention from researchers. In this context, this paper presents the experimental results from destructive tests carried out on a masonry arch strengthened with steel fiber reinforced mortar (SFRM). The tested masonry arch was made of solid clay bricks disposed in a single layer and was strengthened with a single layer of steel FRM bonded at the arch intrados. In order to replicate the possible condition of an existing arch in which acting loads exceeded the member strength, the arch was preloaded before strengthening. The performance of the strengthened arch is discussed in terms of witnessed failure mode, ductility and increase in the load carrying capacity with respect to unstrengthened condition.

scholarly journals Behavior of Simply Supported Concrete Beam Using CFRP (Carbon Fiber Reinforced Polymer)

2021 ◽  
Vol 1197 (1) ◽  
pp. 012033
Author(s):  
Akshay Shivankar ◽  
K.R. Dabhekar ◽  
P.B. Patil ◽  
D.P. Mase ◽  
I.P. Khedikar
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Double Layer ◽  
Carrying Capacity ◽  
Concrete Beam ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Cfrp Composite ◽  
Ultimate Load Carrying Capacity

Abstract The aim of this paper is to study the behavior of beam with the use of CFRP composite by experimentally and by ANSYS and compare both the results and compare load carrying capacity. For experimentally we cast Nine no’s of beam of size 100×100×400 mm, of M30 grade of concrete and curing for 7 days and after 7 days curing we conduct UPV test and find homogeneity of concrete beam and decided carbon fiber wrapping techniques we create two set of beam with 230 GSM wrapped with double layer and two set of beam with 430 GSM wrapped with double layer and two set of beam with 430 GSM wrapped with single layer, and 3 control beams without wrapping and test for flexural strength and by this test we observe the ultimate load carrying capacity and flexural strength of carbon fiber wrapped beam is increased as compare to control beams.

Multi-objective optimization of stacked radial passive magnetic bearing

2017 ◽  
Vol 232 (9) ◽  
pp. 1140-1159 ◽  
Author(s):  
KP Lijesh ◽  
Mrityunjay Doddamani ◽  
SI Bekinal ◽  
SM Muzakkir
Keyword(s):  
Carrying Capacity ◽  
Three Dimensional ◽  
Single Layer ◽  
Maximum Load ◽  
Magnetic Bearing ◽  
Load Carrying Capacity ◽  
Multi Objective Optimization ◽  
Design And Optimization ◽  
Multi Objective ◽  
Load Carrying

Modeling, design, and optimization for performances of passive magnetic bearings (PMBs) are indispensable, as they deliver lubrication free, friction less, zero wear, and maintenance-free operations. However, single-layer PMBs has lower load-carrying capacity and stiffness necessitating development of stacked structure PMBs for maximum load and stiffness. Present work is focused on multi-objective optimization of radial PMBs to achieve maximum load-carrying capacity and stiffness in a given volume. Three-dimensional Coulombian equations are utilized for estimating load and stiffness of stacked radial PMBs. Constraints, constants, and bounds for the optimization are extracted from the available literature. Optimization is performed for force and stiffness maximization in the obtained bounds with three PMB configurations, namely (i) mono-layer, (ii) conventional (back to back), and (iii) rotational magnetized direction. The optimum dimensions required for achieving maximum load without compromising stiffness for all three configurations is investigated. For designers ease, equations to estimate the optimized values of load, stiffness, and stacked PMB variables in terms of single-layer PMB are proposed. Finally, the effectiveness of the proposed method is demonstrated by considering the PMB dimensions from the available literature.

Stability Analysis for a Single-Layer Reticulated Shell

2014 ◽  
Vol 614 ◽  
pp. 635-639
Author(s):  
Jin Duan ◽  
Jun Cong ◽  
Guo Jun Feng ◽  
Bing Lin
Keyword(s):  
Stability Analysis ◽  
Carrying Capacity ◽  
Critical Loads ◽  
Full Range ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
Range Analysis ◽  
Buckling Modes ◽  
Load Carrying ◽  
Linear Buckling

A stability analysis for a single-layer reticulated shell is presented in this paper. The structural buckling modes and critical loads are calculated first. A preliminary security examination is presented based on the results of linear buckling anasys. And then the load-carrying capacity of this structure would be calculated through the geometric nonlinear full-range analysis. Finally a conclusion is deduced that the stable bearing capacity of this structure has met the requirements of the specification.

Design methodology for monolithic layer radial passive magnetic bearing

2018 ◽  
Vol 233 (6) ◽  
pp. 992-1000
Author(s):  
Lijesh K Parambil
Keyword(s):  
Carrying Capacity ◽  
Design Methodology ◽  
Design Procedure ◽  
Single Layer ◽  
Maximum Load ◽  
Magnetic Bearing ◽  
Computational Time ◽  
Load Carrying Capacity ◽  
Straightforward Method ◽  
Load Carrying

Passive magnetic bearings (PMBs) are considered to be one of the economical and effective methods for levitating two surfaces in relative motion. This obviates the use of lubrication, provides zero wear, and negligible friction, thereby making the operation maintenance free. Due to these advantages, the modeling and design of the PMBs were given substantial importance in many studies. However, a well-defined designing procedure to achieve desired load carrying capacity for the given space constraints for the intended PMB application is yet to be established. Prior studies were performed on PMBs for achieving maximum load carrying capacity, but no design methodology was proposed that could facilitate easier design of a PMB in lesser computational time. In the present work, a very effective and a straightforward method is proposed to design a PMB for its paramount output. For this, dimensions of PMBs from the literature are considered for analysis and a set of equations are proposed for the determination of mean radius, axial length, and clearance for a given inner and outer radii of single layer PMBs. Finally, an equation is provided for estimating the load carrying capacity for the determined dimensions of PMB from the proposed design procedure. The effectiveness of the proposed methodology is demonstrated by considering the dimensions of PMBs from 10 literature.

Sign in / Sign up

Export Citation Format

Share Document