Study on Adjustment of Large Structure Objects’ Shipment Processing by Trailers

2013 ◽  
Vol 319 ◽  
pp. 409-413
Author(s):  
Jian Min Li
Keyword(s):  
Load Distribution ◽  
Simulation Analysis ◽  
Center Of Gravity ◽  
Large Structure ◽  
Deflection Curve ◽  
Distribution Method ◽  
Surface Contact

Different from the Slippage shipment, when using platform trailers for shipment, the structure’s weight evenly distributed on the small wheel’s axles, because of tire’s deformation, as the trailers continue moving to the barge, the surface contact between the wheels and ground makes the load gradually apply to the barge, then the center of gravity also changes. In this research, based on analysis of the heavy truck’s tire deflection curve, in the process of load distribution, method of calculating the structure’s weight on barge with the trailers gradually move forward can be obtained, through simulation analysis, the load adjustment can be ensured accurately.

Three Dimensional Grillage Analysis of Reactions on Supports of a Pre-Erection Block

2013 ◽  
Author(s):  
Sungchan Kim ◽  
Cheolho Ryu ◽  
Youngho Kim ◽  
Changbong Han ◽  
Dong Geun Kim
Keyword(s):  
Load Distribution ◽  
Three Dimensional ◽  
Evaluation Process ◽  
Center Of Gravity ◽  
Integrated System ◽  
Structural Safety ◽  
Detail Design ◽  
Grillage Analysis ◽  
Cad Models ◽  
Reaction Forces

There are many PE(Pre-Erection) Blocks in open areas of the shipyard, which are supported by the wooden, concrete, or steel supports. Their position and numbers are decided on a basis of the workers’ experiences. Recently, many shipyards have been making PE blocks with various shape and weight distribution because of the variety of kinds of ships and their building technology. Seriously, they are treating blocks which have not been experienced. In order to evaluate the reliability of all support plans of PE Blocks in such situation, many man hours (MH) are consumed, and the special knowledge and technology about structural analysis are required. We proposed how to conveniently and quickly evaluate the structural safety on PE block supports and developed an application system to implement the evaluation process with three dimensional part models of the PE block and their weight information. The evaluation is based on the simplification to a grillage model of a PE block and its grillage analysis. The load distribution on the grillage model is calculated by two approaches. The first is that the load distribution on the grillage nodes are estimated with the real weight and the center of gravity of each part of a PE block, which can be provided from design databases of the shipyard. The other is that the load distribution is optimally estimated only with the weight and the center of gravity of sub blocks of a PE block. The latter is useful in the case that block information of mother ships can be obtained without the detail design of the PE block. The integrated system has been comprehensively implemented in order to make the grillage model from the three dimensional CAD models of the PE block and their weight information, and to perform the grillage analysis for the reaction forces on the block supports. In the application program, the grillage model can be automatically built from CAD models of PE block. Also the grillage can be modified by inserting, splitting, and deleting a beam element.

scholarly journals Effect of Equivalent Load Distribution on the Accuracy of Mapping the Reinforcement Load Deflection Curve in LTP

2020 ◽  
Vol 10 (17) ◽  
pp. 6127
Author(s):  
Beata Gajewska ◽  
Marcin Gajewski
Keyword(s):  
Load Distribution ◽  
Load Transfer ◽  
Single Case ◽  
Soft Soil ◽  
Triangular Distribution ◽  
Deflection Curve ◽  
Measurement Results ◽  
Equivalent Load ◽  
Load Deflection Curve ◽  
Best Fit

The formulations of tasks modelling embankments on soft soil, improved with columns and with reinforced load transfer platform (LTP), differ significantly. One of these differences is the distribution of equivalent load modelling part of the load carried by the LTP reinforcement and soft soil. This article analyses the influence of the nature of the load-modelling linear function, i.e., inverse triangular, uniformly distributed and triangular, as well as intermediate distributions. In total, 41 distributions of equivalent load were considered, and the results of the obtained deflection functions were compared with the measurement results of reinforcement deflection for 5 cases of experimental research available in the literature. A measure of the accuracy of mapping the reinforcement deflection curve was proposed as a relative error in relation to the deflection curve resulting from experimental measurements. Based on the analysis of the mapping error, it was determined that among the three commonly used distributions, the inverse triangular distribution shows the best fit in most of the analysed cases. However, not in every single case this is the distribution leading to a solution that best describes the behaviour of the geosynthetic reinforcement.

Research on Loading Distribution by Trailers

2013 ◽  
Vol 718-720 ◽  
pp. 1614-1617
Author(s):  
Ke Qin Chen
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Contact Length ◽  
Center Of Gravity ◽  
Deformation Curve ◽  
Scale Structure ◽  
Heavy Trucks ◽  
Actual Load ◽  
Surface Contact

Different from the Slippage shipment, when platform trailers have been used for shipment, the weight of large-scale structure objects evenly distributes on the small wheels axles. Because of tires deformation that generates by trailers continuing to moving to the barge, the surface contact between the wheels and ground makes the load gradually acts on the barge, and meanwhile the center of gravity also changes which is inconvenient to the actual load adjustment. In this research, based on analyzing the heavy trucks tire deformation curve and according to the relevant theories, the contact length of the tire and ground can be calculated. With the trailers gradually move forward, the load equally distributes to each column of the trailers wheels.

scholarly journals Effect of Physiotherapy on Foot Function During Treatment of Hallux Valgus

2019 ◽  
Vol 1 (12) ◽  
Author(s):  
Asta Samienė ◽  
Vaida Berneckė ◽  
Aurelija Simavičienė
Keyword(s):  
Physical Therapy ◽  
Muscle Strength ◽  
Hallux Valgus ◽  
Load Distribution ◽  
Valgus Deformity ◽  
Center Of Gravity ◽  
Public Institution ◽  
Great Toe ◽  
Hallux Valgus Deformity ◽  
Foot Function

Research background. The present final paper presents an analysis of the effects of physiotherapy on foot function when treating the hallux valgus deformity. The research object was the change of the deformity degree of the great toe, foot pain, muscle strength, load distribution in the sole, trajectory of the sole’s center of gravity and foot’s contact with the movement’s surface in different stages of walking after the treatment. Objectives of the research were to analyze scientific literature about the hallux valgus, the concept of foot function and its treatment; determine the changes in the deformity degree of the great toe, pain intensity and muscle strength prior to and after the physical therapy exercises; assess the load distribution in the soles of the respondents, trajectory of the sole’s center of gravity and foot’s contact with the movement’s surface in different stages of walking prior to and after the physiotherapy exercises. Methods. The study was carried out at the Out-Patient Recuperation Center of the Public Institution Šiauliai National Hospital. The computer-aided pedobarographic assessment of the foot was performed by a representative of the Bauerfeind Company at the Manual Medicine Clinic. The study was carried out from December 2013 to April 2014. Twelve respondents afflicted with hallux valgus deformity participated in the study. The duration of the exercise sessions was 11 Results. According to the analysis of the research data, the intensity of pain was influenced by both the exercises and the use of orthopedic supports. However, the pain decreased more after physiotherapy compared to the use of orthopedic supports. The changes in the deformity degree of the great toe and muscle strength were also positively affected by exercises. In EKt group the muscle strength of the tested muscles changed by 1–2 points. In the EO group the muscle strength and the deformity degree of the great toe remained unchanged after the use of orthopedic supports. Following the analysis of the load distribution in the sole, trajectory of the sole’s center of gravity and foot’s contact with the movement’s surface, it became obvious that the physiotherapy had positive a impact on the decrease of load distribution points in different places of the sole and the trajectory of the sole’s center of gravity for the respondents in the Conclusion. After the exercises the toe of one patient was aligned properly and the remaining patients were close to achieving proper alignment. Also, the exercises had a positive influence on the foot’s contact with the movement’s surface. The EO group did not observe any positive changes after using the orthopedic supports, i.e. the load distribution points, trajectory of the center of gravity and foot’s contact with the movement’s surface were not altered.Keywords: hallux valgus, foot function, physical therapy.

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