Evaluation of Behaviour of Plan Curved Structure Supported by Arch

2021 ◽  
Vol 322 ◽  
pp. 193-199
Author(s):  
Jan Trenz ◽  
Karel Zlatuška ◽  
Radim Nečas ◽  
Jiří Stráský
Keyword(s):  
Physical Model ◽  
Design Method ◽  
Steel Part ◽  
Calculation Model ◽  
Strain Gauges ◽  
University Of Technology ◽  
Upper Deck ◽  
New Type ◽  
Arch Structures ◽  
Curved Structure

New type of plan curved structure has been developed within the research of arch footbridges at Faculty of Civil Engineering of Brno University of Technology. Structural arrangement came out of study of behaviour of plan curved upper deck arch structures of various radii of curvature. The design method of such structures with ideal shape of arch was the outcome of the research. Results of numerical analysis were verified on physical model in scale 1:10, which has been built and tested. The model has been mounted with gauges – 41 strain gauges at various positions on concrete and steel part of the structure and 5 deflection sensors. Then the structure has been subjected to loads in various positions corresponding with load positions of variable loads in calculation model. The paper describes evaluation of measurement of stresses and deformations of physical model of plan curved structure supported by an arch. Obtained values of stresses and deformations were compared with values derived from FE calculation model.

Lattice Light Steel Frame System and Application

2011 ◽  
Vol 105-107 ◽  
pp. 1110-1113
Author(s):  
Bo Ding ◽  
Huan Qing Jiang ◽  
Hong Xia Wan ◽  
Feng Zhang
Keyword(s):  
High Speed ◽  
Design Method ◽  
Calculation Model ◽  
Steel Frame ◽  
Calculation Results ◽  
Frame System ◽  
Practical Engineering ◽  
Steel Consumption ◽  
New Type ◽  
New System

Lattice light steel frame is a new type of structural system, combining general steel framework which is composed of lattice column and lattice beam with lattice light steel keel of the partitions and floors, the system takes full advantages of both structural systems, with high speed construction, less steel consumption, good earthquake-resistance etc., and possesses good prospects. The paper describes the system construction approach and the characteristics of lattice light steel frame system, and provides a project example of a villa. The design method and calculation model of the project are presented. Calculation results meet the specifications’ requirements, proving the new system can be applied to practical engineering. The paper gives guidance for application and research of this new system.

SCISSORING ORIGAMI INSPIRED DEPLOYABLE BRIDGE FOR A DISASTER

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Kotaro Adachi ◽  
Ichiro Ario ◽  
Yuki Chikahiro ◽  
Shuichi Ono
Keyword(s):  
Design Method ◽  
Numerical Approach ◽  
Calculation Model ◽  
Rescue Work ◽  
Work Site ◽  
Method Of Calculation ◽  
Significant Damage ◽  
Rescue System ◽  
New Type ◽  
Secondary Disasters

Many natural disasters cause not only critical situations for facilities and resident's life, but also significant damage to economy. It is obvious that quick rescue action must be undertaken and that there are many problems due to the occurrence of secondary disasters at rescue work-site. For example, many bridges were damaged by a huge earthquake in 2011 in Japan’s Tohoku areas, called the Great East Japan Earthquake. We need to develop a new rescue structure to survive these disasters. We have to consider how to rebuild damaged infrastructures and how to build a new type of rescue system. Therefore, we suggest a new type of emergency bridge, Mobile bridge(MB). In this paper, we discuss the scissors type of bridge in order to evaluate its numerical approach including a reinforced strut and characteristics. Moreover, we analyze the design method of calculation model based on theoretical equilibrium theory based on origami-folding engineering.

scholarly journals Mechanical-Level Hardware-In-The-Loop and Simulation in Validation Testing of Prototype Tower Crane Drives

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5727
Author(s):  
Michał Michna ◽  
Filip Kutt ◽  
Łukasz Sienkiewicz ◽  
Roland Ryndzionek ◽  
Grzegorz Kostro ◽  
...  
Keyword(s):  
Laboratory Testing ◽  
Environmental Parameters ◽  
Experimental Tests ◽  
Drive System ◽  
Hardware In The Loop ◽  
Dynamic Simulations ◽  
Tower Crane ◽  
University Of Technology ◽  
New Type ◽  
Drive Systems

In this paper, the static and dynamic simulations, and mechanical-level Hardware-In-the-Loop (MHIL) laboratory testing methodology of prototype drive systems with energy-saving permanent-magnet electric motors, intended for use in modern construction cranes is proposed and described. This research was aimed at designing and constructing a new type of tower crane by Krupiński Cranes Company. The described research stage was necessary for validation of the selection of the drive system elements and confirmation of its compliance with applicable standards. The mechanical construction of the crane was not completed and unavailable at the time of testing. A verification of drive system parameters had to be performed in MHIL laboratory testing, in which it would be possible to simulate torque acting on the motor shaft. It was shown that the HIL simulation for a crane may be accurate and an effective approach in the development phase. The experimental tests of selected operating cycles of prototype crane drives were carried out. Experimental research was performed in the LINTE^2 laboratory of the Gdańsk University of Technology (Poland), where the MHIL simulator was developed. The most important component of the system was the dynamometer and its control system. Specialized software to control the dynamometer and to emulate the load subjected to the crane was developed. A series of tests related to electric motor environmental parameters was carried out.

Suspend-Dome Static Behavior Analysis

2013 ◽  
Vol 351-352 ◽  
pp. 1057-1060 ◽  
Author(s):  
Xi Yun Dai ◽  
Xiang Yun Kong ◽  
Lin Tian
Keyword(s):  
Design Method ◽  
Joint Stiffness ◽  
Hybrid Structure ◽  
Structure Form ◽  
Static Behavior ◽  
Structure System ◽  
Optimizing Design ◽  
New Type ◽  
Dome Structure ◽  
Cable Dome

Suspend-dome structure form which colligates advantages of cable dome and reticulated shell is a new type spatial hybrid structure system. This article introduced the configuration and principle of suspend-dome structure system, and researched the structural behavior influence by altering the joint stiffness, vector height of the suspend-dome and the loop cable pretension. The results show that suspend-dome structure should make comprehensive consideration on interaction between vector height, prestress application and other factors, and relevant optimizing design method can be adopted in the design.

Experimental Study on In-Plane Behavior of CFST Arch with New-Type Dumbbell-Shaped Section

2011 ◽  
Vol 255-260 ◽  
pp. 1198-1203 ◽  
Author(s):  
Ye Sheng
Keyword(s):  
Local Buckling ◽  
High Strength ◽  
Steel Tube ◽  
Calculation Model ◽  
Plastic Behavior ◽  
Loading Process ◽  
New Type ◽  
Set Up ◽  
Ultimate Load Carrying Capacity ◽  
Shaped Section

The weakness of traditional dumbbell-shaped section is that when concrete is filled into the web space, great stress is likely to produce cracks in the weld sealing between steel tube and web plates. In order to avoid this condition, a new-type dumbbell-shaped section is proposed. Experiments on concrete filled steel tubular (CFST) model arches with new-type dumbbell-shaped section have been carried out, concentrated loading at crown and L/4 section respectively. The result indicated that the new-type CFST arch has good elastic-plastic behavior and high strength, no local buckling appeared during the whole loading process, its in-plane mechanic behavior is similar with that of the CFST arch with single-tube. The dual nonlinear finite element calculation model is set up for the model arch, by means of this model the load-deflection curves during the loading process and the ultimate load-carrying capacity is analyzed.

Evaluation of Negative Skin Friction on Bridge Abutment Piles

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Osama Drbe
Keyword(s):  
Skin Friction ◽  
Pore Water Pressure ◽  
Design Method ◽  
Water Pressure ◽  
Strain Gauges ◽  
Total Stress ◽  
Vibrating Wire ◽  
Negative Skin Friction ◽  
Drag Forces ◽  
Wire Strain

Piles are used to transfer loads of structures to deeper and stronger soil layers through skin friction and/or end bearing. Surcharge loads, site grading, or dewatering may induce downward movement of soil adjacent to piles installed in a compressible medium. This movement creates negative skin friction stresses acting downward at the pile-soil interface, which applies additional loads “drag forces” to the pile causing a maximum axial load in the pile shaft at the “neutral plane”. To evaluate the development of drag forces, a comprehensive field monitoring program was conducted over four years for three instrumented abutment H-piles as part of a three-span bridge project. The soil settlement and changes in pore water pressure in the soil adjacent to the piles due to the construction of an approach embankment were monitored using multiple-point extensometers and vibrating wire piezometers. The piles’ elastic settlement and strains were measured using single-point extensometers and vibrating wire strain gauges. The field measurements are presented and discussed in terms of responses time histories and load distribution along one pile shaft. In addition, the calculated forces from vibrating wire strain gauges are compared with the unified design method prediction considering the total stress method (α-method) for cohesive soils. The results show that the maximum drag force was developed after the complete dissipation of excess pore water pressure and that the location of neutral plane varied during the embankment construction stages. Employing the total stress method in the unified design method provided a reasonable prediction of the drag force and the neutral plane’s location.

scholarly journals Manipulate Vibration Propagation by Anisotropic Honeycomb Structure

2018 ◽  
Vol 175 ◽  
pp. 03040
Author(s):  
Xiang Chen ◽  
Xiao-ming Wang ◽  
Yu-lin Mei
Keyword(s):  
Design Method ◽  
Honeycomb Structure ◽  
Homogenization Method ◽  
Unit Cell ◽  
Field Analysis ◽  
Acoustic Wave Propagation ◽  
Asymptotic Homogenization ◽  
Fluid Properties ◽  
Asymptotic Homogenization Method ◽  
New Type

As a new type of acoustic metamaterial, the pentamode material has extensive application prospect in controlling acoustic wave propagation because of its fluid properties. Firstly, a kind of pentamode material unit cell is designed, which is a two-dimensional honeycomb truss structure. Then, the asymptotic homogenization method is used to calculate static parameters of the unit cell, and also the influence of the geometric parameters and material composition of the unit cell on its mechanical properties is studied. Besides, based on transformation acoustics and the design method of the cylindrical cloak proposed by Norris, an acoustic cloak with isotropic density and gradient elastic modulus is constructed by periodically assembling the unit cell to guide the wave to bypass obstacles. Finally, the full displacement field analysis is carried out to prove the stealth effect of the acoustic cloak.

Mechanism design of a simplified 6-DOF 6-RUS parallel manipulator

Robotica ◽  
2002 ◽  
Vol 20 (1) ◽  
pp. 81-91 ◽  
Author(s):  
Xin-Jun Liu ◽  
Jinsong Wang ◽  
Feng Gao ◽  
Li-Ping Wang
Keyword(s):  
Mechanism Design ◽  
Physical Model ◽  
Parallel Manipulator ◽  
Design Method ◽  
Three Dimensional ◽  
Solution Space ◽  
Parallel Manipulators ◽  
Dimensional Problem ◽  
Spherical Joint ◽  
Universal Joint

This paper concerns the issue of mechanism design of a simplified 6-DOF 6-RUS parallel manipulator. The design of robotic mechanisms, especially for 6-DOF parallel manipulators, is an important and challenging problem in the field of robotics. This paper presents a design method for robotic mechanisms, which is based on the physical model of the solution space. The physical model of the solution space, which can transfer a multi-dimensional problem to a two or three-dimensional one, is a useful tool to obtain all kinds of performance atlases. In this paper, the physical model of the solution space for spatial 6-RUS (R stands for revolute joint, U universal joint and S spherical joint) parallel manipulators is established. The atlases of performances, such as workspace and global conditioning index, are plotted in the physical model of the solution space. The atlases are useful for the mechanism design of the 6-RUS parallel manipulators. The technique used in this paper can be applied to the design of other robots.

Flow Field Analysis of PVC Polymerizer

2014 ◽  
Vol 884-885 ◽  
pp. 68-72
Author(s):  
Hui Di Hao ◽  
Tian Qi Cheng ◽  
Yong Fang Zhang ◽  
Na Zhu ◽  
Jian Yong Lei ◽  
...  
Keyword(s):  
Flow Field ◽  
Design Method ◽  
Suspension Polymerization ◽  
Calculation Model ◽  
Structure Design ◽  
Raw Material ◽  
Field Analysis ◽  
Stirred Tank ◽  
Chemical Production ◽  
Complex Flow

Stirred tank reactor is one of the three typical chemical machinery equipments and widely used in petroleum, chemical, pharmaceutical and other industrial fields .It is the basis of understanding the flow of fluid in stirred tank for optimizing design of reactor. This paper aims at the process of suspension polymerization of polyvinyl chloride (PVC) which is an important raw material of chemical production, and uses conventional design method to design the PVC stirred tank of 50m3 from the structure design. According to the fluid dynamics theory, standard K-E turbulent calculation model is established under the function of impeller, the corresponding boundary conditions are listed, and the grid is carried out successfully. And finally the FLOTRAN CFD software is used to simulate the complex flow field and flow pattern according to the multiple reference frame method.

Modelling and testing of a granular insulating material

2017 ◽  
Vol 42 (1) ◽  
pp. 6-15 ◽  
Author(s):  
Bożena Orlik-Kożdoń ◽  
Artur Nowoświat
Keyword(s):  
Thermal Conductivity ◽  
Granular Medium ◽  
Geometrical Model ◽  
Calculation Model ◽  
Elastic Plates ◽  
University Of Technology ◽  
Building Component ◽  
Definition Of ◽  
Insulation Plate

In the following article, the Authors present the results of initial researches into a building component needed for thermal insulation. The building component is a elastic insulation plate made from recycling materials. The solution is protected by industry patter Elastyczna pyta izolacyjna No 23 621 for Silesian University of Technology Gliwice. The paper presents the determination method of effective thermal conductivity for granular materials. It is based on the geometrical model for the determination of granular medium structure, which is based on the theory of the highest-density arrangement of equal-sized spheres. The elaborated by the Authors modeling results, obtained on the basis of an innovative description (definition) of granular medium, were addressed to the commonly applied two-component medium. To verify the correctness of the calculation model proposed by the Authors, the results were subjected to validation, basing on the thermal conductivity of elastic plates in a hot plate apparatus.

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