Axial and Moment Carrying Capacity of Split Sleeve Grouted Connections for Repair of Tubular Members

2019 ◽  
Author(s):  
N. Vignesh Chellappan ◽  
S. Nallayarasu
Keyword(s):  
Numerical Simulation ◽  
Carrying Capacity ◽  
Parametric Study ◽  
Load Transfer ◽  
Element Model ◽  
Offshore Structures ◽  
Geometric Parameters ◽  
Axial Tension ◽  
Load Transfer Mechanism ◽  
Comprehensive Study

Abstract The tubular members damaged by ship impact or falling objects require repair and rehabilitation in offshore structures. The repair of damaged underwater tubular member using welding is hazardous and expensive and hence alternative connection methods such as grouted clamp techniques have been in use for many decades. The existing guideline on the design of grouted connections especially under axial tension and moment is very limited and requires further study. The load transfer mechanism of grouted clamps depends on various geometric parameters and bond between clamp and parent member. A comprehensive study on split sleeve grouted connection for load transfer between two parts of tubular members has been investigated and presented. Numerical simulation of split sleeve grouted connection has been carried out using finite element model of tubular member – sleeve through bond strength of grout. The numerical model has been validated using existing guidelines and further parametric study has been carried out. The parametric study includes geometric parameters such as diameter to wall thickness ratio of split sleeve, sleeve friction length, grout strength and grout shrinkage. The simulations have been carried out for combination of axial tension and moment loading.

Geotechnical capacity of hollow-bar micropiles in cohesive soils

2014 ◽  
Vol 51 (10) ◽  
pp. 1123-1138 ◽  
Author(s):  
Ahmed Yehia Abd Elaziz ◽  
M. Hesham El Naggar
Keyword(s):  
Parametric Study ◽  
Load Transfer ◽  
Ground Improvement ◽  
Field Tests ◽  
Element Model ◽  
Cohesive Soils ◽  
Silty Clay ◽  
Test Results ◽  
Axial Capacity ◽  
Load Transfer Mechanism

Hollow-bar micropile construction, also known as self-drilled, is becoming a popular option because it allows faster installation processes and ground improvement at the same time. This paper presents a field study and numerical investigation on the behaviour of single hollow-bar micropiles embedded in a stiff silty clay deposit. Four hollow-bar micropiles were installed using an air-flushing technique employing large drilling carbide bits. Five axial tests were conducted on the four micropiles, comprising three compression and two tension monotonic axial tests. The results of the field tests are presented and analyzed in terms of load–displacement curves. A two-dimensional axisymmetric finite element model (FEM) was created and calibrated using the field test results. The calibrated FEM was utilized to select an appropriate failure criterion for hollow-bar micropiles depending on the load-transfer mechanism of the micropiles. In addition, the model was employed to carry out a parametric study to investigate the effect of the installation methodology, hollow-bar micropile geometry, and shear strength of the surrounding soils on the micropile capacity. Based on the outcomes of the parametric study, an equation is proposed to estimate the axial capacity of hollow-bar micropiles in cohesive soils.

On the Response of Elastic-Plastic Tubes Under Combined Bending and Tension

1992 ◽  
Vol 114 (1) ◽  
pp. 50-62 ◽  
Author(s):  
J. Y. Dyau ◽  
S. Kyriakides
Keyword(s):  
Numerical Simulation ◽  
Parametric Study ◽  
Axial Load ◽  
Test Specimen ◽  
Experimental Results ◽  
Two Dimensional ◽  
Plastic Range ◽  
Rigid Surface ◽  
Axial Tension ◽  
Thin Walled

This paper is concerned with the response of long, relatively thin-walled tubes bent into the plastic range in the presence of axial tension. The work is motivated by the design needs of pipelines installed and operated in deep offshore waters. The problem is studied through a combination of experiment and analysis. In the experiments, long metal tubes were bent over a smooth, circular, rigid surface (mandrel). Bending of the tubes was achieved by shear and axial end loads. The experimental arrangement is such that a significant section of the test specimen is loaded and deformed in an axially uniform fashion. The ovalization induced in the specimen was measured as a function of the axial load in the tube for two mandrel radii. A two-dimensional numerical simulation of the problem has been developed and validated against the experimental results. This analysis was used to conduct a parametric study of the effect of tension on the ovalization induced in a long tube during bending.

Numerical Study on the Static Response of Grouting-Sleeve Reinforcement-Connection Component under Axial Tension Load

2013 ◽  
Vol 353-356 ◽  
pp. 3312-3315
Author(s):  
Fan Gu ◽  
Tao Gao Wu ◽  
Wei Jian Zhao ◽  
Xin Dui
Keyword(s):  
Numerical Simulation ◽  
Mechanical Property ◽  
Numerical Study ◽  
Element Model ◽  
Static Response ◽  
Actual Structure ◽  
Axial Tension ◽  
Tension Load ◽  
Grouting Material ◽  
Connection Component

According to the actual structure of grouting sleeve, the ABAQUS finite element model of grouting-sleeve reinforcement-connection component under axial tension load was established, and the stress distribution at reinforcement, grouting material and sleeve were gotten. Numerical simulation shows that the compressive cones in grouting material are formed to transfer load between reinforcement and sleeve. Moreover, simulation indicates that mechanical property of grouting material is the most important factor for the physical reliability of reinforcement connection.

Research Progress on Mechanical Properties of Chinese Ancient Mortise-Tenon Joints

2013 ◽  
Vol 405-408 ◽  
pp. 1067-1072
Author(s):  
Xiao Sheng Song ◽  
Jing Yu Su ◽  
Xiao Dong Guo
Keyword(s):  
Mechanical Properties ◽  
Seismic Performance ◽  
Carrying Capacity ◽  
Load Transfer ◽  
Research Progress ◽  
Timber Structures ◽  
Failure Characteristics ◽  
Load Transfer Mechanism ◽  
Relationship Of ◽  
The Relationship

Mortise-tenon joint is an important characteristic of Chinese ancient timber buildings. Survey on mortise-tenon joint of Chinese timber structures in the last twenty years is summarized and reviewed in five aspects as follows: (1) load transfer mechanism, (2) the relationship of M-θ, (3) the failure characteristics, (4) carrying capacity, and (5) seismic performance. Finally, research on the strengthening of mortise-tenon joints is presented in this paper.

scholarly journals Parametric Study on Dynamic Tension Behaviour of Offshore Pipeline for Deepwater S-lay Operation

2018 ◽  
Vol 38 ◽  
pp. 03014
Author(s):  
Pu Xu ◽  
Shun Feng Gong ◽  
Ting Zhang ◽  
Cheng Chen
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Water Depth ◽  
Parametric Study ◽  
Element Model ◽  
Outer Diameter ◽  
Dynamic Tension ◽  
Axial Tension ◽  
Offshore Pipeline ◽  
Pipeline Design

In recent years, higher demands for offshore pipeline design of deepwater installation are put forward. This paper mainly aims to investigate the influence of pipelay parameters on dynamic tension behaviour of deepwater S-lay pipeline to optimize the design of pipe structure and tensioner. A full finite element model for deepwater S-lay systems is developed to simulate the dynamic response of offshore pipeline from the pipelay vessel via stinger to the seabed. The influences of water depth, outer diameter and submerged self-weight of the pipe, and stinger length on the dynamic tension behaviour of the pipeline have been quantitatively studied. A strong relevance between the axial tension of offshore pipeline and pipelay parameters is observed, which offers very intuitive evidences for the design of pipe structure and tensioners.

Load-transfer mechanism in angle-encased CFST members under axial tension

2019 ◽  
Vol 178 ◽  
pp. 162-178 ◽  
Author(s):  
Fei Xu ◽  
Jun Wang ◽  
Ju Chen ◽  
Yu-hang Wang
Keyword(s):  
Load Transfer ◽  
Transfer Mechanism ◽  
Axial Tension ◽  
Load Transfer Mechanism

Numerical Simulation of Load Transfer Mechanism of T-Shaped Soil-Cement Deep Mixing Column

2014 ◽  
Vol 580-583 ◽  
pp. 118-122 ◽  
Author(s):  
Pei Sheng Xi ◽  
Xiao Tao Zhang ◽  
Bo Liu
Keyword(s):  
Numerical Simulation ◽  
Load Transfer ◽  
Transfer Mechanism ◽  
Deep Mixing ◽  
Pile Diameter ◽  
Load Transfer Mechanism ◽  
Soil Cement ◽  
Head Height ◽  
General Section ◽  
Cement Deep Mixing

T-shaped soil-cement deep mixing column load transfer mechanism is different from the general section column. Basing on the fast Lagrangian finite difference method, we study the load transfer mechanism of T-shaped soil-cement deep mixing column at different load levels, expanding head height and the ratio of upper and lower pile diameter. By the numerical simulation we obtained that the axial force plummeted value of expanding head flange increases with the load and the ratio of upper and lower pile diameter increasing, it will decreases when the height of expanding head increasing.This paper can provide a reference for the design of T-shaped soil-cement deep mixing column.

scholarly journals Effect of Combined Beam Slab Interactive Resisting Mechanism for Progressive Collapse

2020 ◽  
Vol 9 (4) ◽  
pp. 2396-2400
Keyword(s):  
Finite Element ◽  
Carrying Capacity ◽  
Load Transfer ◽  
Progressive Collapse ◽  
Dissipation Factor ◽  
Reinforced Concrete Structures ◽  
Load Carrying Capacity ◽  
Finite Element Software ◽  
Load Transfer Mechanism ◽  
Load Carrying

In reinforced concrete structures slab, beam and column plays an important role in load transfer mechanism. When a column fails due to earthquake or attack, progressive collapse may occur. There is a need to study and understand the performance of the RC framed structure under progressive collapse to design a better structure. This study investigates the effect of combined Beam-Slab interactive resisting mechanism against progressive collapse using finite element software. Linear static analysis was used to study the progressive collapse of the RC framed structure. The models of symmetrical regular building with bare frame, frame with slab and frame slab with infill were studied. The parameters like load carrying capacity, energy dissipation factor and stiffness degradation were analysed. The analysis results showed that frame slab with infill showed better resistance during progressive collapse.

Finite Element Analysis of Deep Transverse Metatarsal Ligaments Mechanical Response during Landing

2012 ◽  
Vol 472-475 ◽  
pp. 2558-2561 ◽  
Author(s):  
Y.D. Gu ◽  
M Rong ◽  
Z.Y Li ◽  
M.J Lake ◽  
G.Q Ruan
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Mechanical Response ◽  
Material Model ◽  
Element Model ◽  
Measurement Technology ◽  
Element Analysis ◽  
Load Transfer Mechanism ◽  
Metatarsal Bones ◽  
Transverse Arch

The deep transverse metatarsal ligaments (DTML) play an important role in stabilizing the metatarsal bones and manipulating foot transverse arch deformation. However, the biomechanical research about DTML in the foot maneuver is quite few. Due to the difficulties and lack of better measurement technology for these ligaments experimental monitor, the load transfer mechanism and internal stress state also hadn’t been well addressed. The purpose of this study was to develop a detailing foot finite element model including DTML tissues, to investigate the mechanical response of DTML during the landing condition. The DTML was considered as hyperelastic material model was used to represent the nonlinear and nearly incompressible nature of the ligament tissue. From the simulation results, it is clearly to find that the peak maiximal principal stress of DTML was between the third and fourth metatarsals. Meanwhile, it seems the DTML in the middle position experienced higher tension than the sides DTML.

Sign in / Sign up

Export Citation Format

Share Document