Numerical Analysis of Highmay under the Traffic Load

2011 ◽  
Vol 97-98 ◽  
pp. 55-59
Author(s):  
Yan Mei Zhang ◽  
Zhen Hua Pan
Keyword(s):  
Numerical Analysis ◽  
Dynamic Response ◽  
Dynamic Stress ◽  
Work Conditions ◽  
Traffic Load ◽  
Design Parameters ◽  
Vibration Acceleration ◽  
Irregularity Index ◽  
Depth Direction ◽  
Base Course

Based on the geometry irregularity of pavement, an expression of the traffic load was put forward. The influence law of design parameters of each part of highway and geometry irregularity of pavement on dynamic response of highway was discussed by the developed two-dimension finite element numerical analysis procedure. The research shows that the vertical maximum vibration acceleration of pavement and subgrade attenuates according to certain trend along depth direction in different work conditions; with the foundation stiffness increasing, the vertical maximum vibration acceleration of base course and cushion increases gradually, and that of pavement surface, subgrade and foundation decreases, and the decreasing amplitude increases gradually along the depth direction; the size of the influence of subgrade on dynamic response of highway is relevant to itself stiffness; the rational matching of all parts of highway can effectively reduce the vibration response; with the increase of geometric irregularity index, the vertical maximum vibration acceleration and maximum dynamic stress of pavement and subgrade increases significantly.

Influence of Design Parameters of Highway on the Deformation

2012 ◽  
Vol 178-181 ◽  
pp. 1658-1662
Author(s):  
Yan Mei Zhang ◽  
Xu Dong Zhang
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Traffic Load ◽  
Design Parameters ◽  
Three Dimension ◽  
Vertical Deformation ◽  
Irregularity Index ◽  
Surface Stiffness

Based on the geometry irregularity of pavement, an expression of the traffic load was put forward. The influence law of design parameters of each part of highway and pavement geometry irregularity on vertical deformation of highway was discussed by the three-dimension finite element numerical analysis. The research shows that the vertical deformation range of highway under the action of traffic load is generally semi-circular; the influence of surface stiffness on vertical deformation is different in different horizontal positions of surface; the influence of subgrade stiffness and foundation stiffness on vertical deformation is remarkable, but that of course stiffness is small; the rational matching of all parts of highway can effectively reduce the vertical deformation; with the increase of geometric irregularity index, the vertical deformation increases significantly.

A Simplified Design Model for Modular Steel Buildings Subject to Vapor Cloud Explosions (VCEs)

2020 ◽  
Vol 14 ◽  
Author(s):  
Osama Bedair
Keyword(s):  
Dynamic Response ◽  
Minimum Cost ◽  
Design Parameters ◽  
Front Wall ◽  
Steel Buildings ◽  
Element Analysis ◽  
Analysis And Design ◽  
Vapor Cloud ◽  
Building Components ◽  
Analytical Expressions

Background: Modular steel buildings (MSB) are extensively used in petrochemical plants and refineries. Limited guidelines are available in the industry for analysis and design of (MSB) subject to accidental vapor cloud explosions (VCEs). Objectives: The paper presents simplified engineering model for modular steel buildings (MSB) subject to accidental vapor cloud explosions (VCEs) that are extensively used in petrochemical plants and refineries. Method: A Single degree of freedom (SDOF) dynamic model is utilized to simulate the dynamic response of primary building components. Analytical expressions are then provided to compute the dynamic load factors (DLF) for critical building elements. Recommended foundation systems are also proposed to install the modular building with minimum cost. Results: Numerical results are presented to illustrate the dynamic response of (MSB) subject to blast loading. It is shown that (DLF)=1.6 is attained at (td/t)=0.4 for front wall (W1) with (td/T)=1.25. For side walls (DLF)=1.41 and is attained at (td/t)=0.6. Conclusions: The paper presented simplified tools for analysis and design of (MSB) subject accidental vapor cloud blast explosions (VCEs). The analytical expressions can be utilized by practitioners to compute the (MSB) response and identify the design parameters. They are simple to use compared to Finite Element Analysis.

Numerical analysis of hip bone replacement design parameters

2021 ◽  
Author(s):  
N. Premkumar ◽  
K. Subhashini ◽  
G. Valarmathi ◽  
Jagadeesh Kumar ◽  
S Meganathan
Keyword(s):  
Numerical Analysis ◽  
Design Parameters ◽  
Bone Replacement ◽  
Replacement Design

scholarly journals Sustainability Assessment of Using Recycled Aggregates in Concrete Block Pavements

2020 ◽  
Vol 12 (10) ◽  
pp. 4313 ◽  
Author(s):  
Md Mizanur Rahman ◽  
Simon Beecham ◽  
Asif Iqbal ◽  
Md Rajibul Karim ◽  
Abu Taher Zillur Rabbi
Keyword(s):  
Sustainability Assessment ◽  
Concrete Block ◽  
Empirical Method ◽  
Environmental Benefits ◽  
Traffic Load ◽  
Recycled Aggregates ◽  
Financial Benefit ◽  
Base Materials ◽  
Material Stiffness ◽  
Base Course

The mechanistic design of a concrete block pavement (CBP) can be very complicated and often requires the use of computer programs. This paper presents a new mechanistic-empirical method, which is implemented in a computer program (DesignPave) that calculates base course/sub-base thicknesses for a range of design inputs such as traffic load, interlocking properties, and material stiffness. A range of virgin and recycled unbound granular materials were also experimentally tested to characterize them for possible use as base course or sub-base materials. Combining the new mechanistic-empirical method and the range of base course/sub-base course materials (virgin and recycled aggregates), it was found that while a CBP containing recycled aggregates did not offer a significant direct financial benefit based on the characteristics or material costs, the associated environmental benefits were very high.

scholarly journals Development of integrated intelligent CAD system for synthesis and stress-deformation analysis of pressure vessels

2018 ◽  
Vol 7 (1.8) ◽  
pp. 147 ◽  
Author(s):  
Isad Šarić ◽  
Adis Muminović
Keyword(s):  
Numerical Analysis ◽  
Geometrical Model ◽  
Pressure Vessels ◽  
Design Parameters ◽  
Deformation Analysis ◽  
Intelligent Cad ◽  
Cad System ◽  
Stress Deformation ◽  
Design Activities ◽  
Stress And Deformation

This paper presents the process of developing an integrated intelligent CAD system (IICAD) for synthesis and stress-deformation analysis of pressure vessels. The name of the system is IICAD PP system. The goal of the paper is to present procedures and steps to develop IICAD system for specific type of products. These procedures and steps can be used to develop IICAD system for any type of specific products or family of products. IICAD PP system can help engineers during calculation and design of pressure vessels. The paper shows that IICAD PP system enables quick calculations of design parameters, automatic generations of 3D geometrical model and automatic conduction of numerical analysis for stress and deformation. All these design activities take a lot of time from engineers if they are done using conventional methods.

Numerical Analysis of Dynamic Response of Lifelines Facilities Adjacent to Deep Excavations

2020 ◽  
Author(s):  
Seddigheh Hasanpour Estahbanati ◽  
Reza Boushehri ◽  
Abbas Soroush ◽  
Omid Ghasemi-Fare
Keyword(s):  
Numerical Analysis ◽  
Dynamic Response ◽  
Deep Excavations

scholarly journals The Dynamic Response of Tuned Impact Absorbers for Rotating Flexible Structures

2005 ◽  
Vol 1 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Steven W. Shaw ◽  
Christophe Pierre
Keyword(s):  
Dynamic Response ◽  
Flexible Structures ◽  
Experimental Studies ◽  
Analytical Investigation ◽  
Design Parameters ◽  
System Response ◽  
Rotor Speed ◽  
Flexible System ◽  
Restoring Forces ◽  
And Performance

This paper describes an analytical investigation of the dynamic response and performance of impact vibration absorbers fitted to flexible structures that are attached to a rotating hub. This work was motivated by experimental studies at NASA, which demonstrated the effectiveness of these types of absorbers for reducing resonant transverse vibrations in periodically excited rotating plates. Here we show how an idealized model can be used to describe the essential dynamics of these systems, and used to predict absorber performance. The absorbers use centrifugally induced restoring forces so that their nonimpacting dynamics are tuned to a given order of rotation, whereas their large amplitude dynamics involve impacts with the primary flexible system. The linearized, nonimpacting dynamics are first explored in detail, and it is shown that the response of the system has some rather unique features as the hub rotor speed is varied. A class of symmetric impacting motions is also analyzed and used to predict the effectiveness of the absorber when operating in its impacting mode. It is observed that two different types of grazing bifurcations take place as the rotor speed is varied through resonance, and their influence on absorber performance is described. The analytical results for the symmetric impacting motions are also used to generate curves that show how important absorber design parameters—including mass, coefficient of restitution, and tuning—affect the system response. These results provide a method for quickly evaluating and comparing proposed absorber designs.

Construction and Evaluation of a Bituminous Roadway Constructed With Municipal Solid Waste Combustor Ash

2001 ◽  
Author(s):  
Samuel P. Lucido ◽  
Willard Wilson
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Structural Testing ◽  
Design Parameters ◽  
Water Runoff ◽  
Breathing Zone ◽  
Included Trial ◽  
Environmental Testing ◽  
The Road ◽  
Base Course

Abstract County State Aid Highway (CSAH) 13, located in Polk County Minnesota, was to be paved with 2.25 miles of new bituminous in October of 2000. Prior to the end of the 2000 construction season, a portion of one lane of the base course was installed, with the remainder to be completed in spring of 2001. The bituminous was amended with ash generated at the municipal solid waste combustor located in Fosston Minnesota. One third of the road was to be paved with traditional bituminous, one third was to be paved with bituminous in which a portion of the aggregate was replaced with “new” ash and one third was to be paved with bituminous in which a portion of the aggregate was replaced with “old” ash. “New” combustor ash is ash generated after the installation of an up-front materials recovery facility (MRF) and “old” combustor ash is ash generated before the installation of the MRF. Ash-amended bituminous was to be used in the base course and binder course of the pavement profile. Significant environmental and structural testing was performed prior to construction. Environmental and structural testing was also performed simultaneously with the construction process. Environmental testing completed in 2000 included: analysis of stack emissions from the bituminous plant, evaluation of breathing zone particulates at the bituminous plant, and analysis of surface water runoff from the ash-amended bituminous. Structural testing included trial mix design parameters. The road was also instrumented to collect water that may infiltrate through the ash-amended bituminous. Environmental testing to be completed in 2001 includes: evaluation of impacts to soils adjacent to the roadway and evaluation of infiltration water collected in the under-pavement collectors. Post-construction pavement testing is also to be completed in 2001. This paper presents the initial results of environmental and structural testing as well as construction issues.

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