Design on Dynamic Performance of Highway Bridges to Moving Vehicular Loads

2013 ◽  
Vol 574 ◽  
pp. 43-51 ◽  
Author(s):  
Qing Fei Gao ◽  
Zong Lin Wang ◽  
Bin Qiang Guo ◽  
Hao Ran Bu ◽  
Wei Xiong
Keyword(s):  
Finite Element ◽  
Dynamic Performance ◽  
Highway Bridges ◽  
Design Codes ◽  
Dynamic Impact ◽  
Finite Element Program ◽  
Moving Vehicles ◽  
Element Program ◽  
Deflection Limit ◽  
Dynamic Impact Factor

Based on the survey of existing highway bridges, there are a large number of flaws induced by moving vehicles. The most important cause of this phenomenon is the lack of design codes on dynamic performance of highway bridges to moving vehicular loads. The existing theory of vehicle-bridge interaction is reviewed. Then the home-code program VBCVA combined with finite element program ANSYS is introduced to analyze the problem of vehicle-bridge interaction. Also, the existing design indexes of dynamic performance are discussed, such as dynamic impact factor, deflection limit, and acceleration. On the basis of above theory and program, the framework of design on dynamic performance of highway bridges to moving vehicular loads is proposed.

Analysis of Dynamic Performance of Air-Cooled Condenser Structure System

2012 ◽  
Vol 170-173 ◽  
pp. 2675-2680
Author(s):  
Ying Sun ◽  
Yan Hong
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Power Plants ◽  
Vibration Mode ◽  
Dynamic Performance ◽  
Cycle Frequency ◽  
Finite Element Program ◽  
Structure System ◽  
Element Program

In situ measurements on two power plants designed air-cooled condenser structure were described in this paper. Operating condition was divided into three types to test the structure system, and then obtaining the data of time-domain waveform and spectrum analysis in each condition. Cycle, frequency and vibration mode of the structure system were obtained by analyzing the data. Meanwhile, the structure was theoretically calculated using finite element program, gaining the cycle, frequency and vibration mode of the structure system. It was concluded that basic vibration mode of the structure system was space torsional vibration by comparison between theoretical values and measured values.

Reliability Analysis of Reinforced Concrete (RC) Plates and Shells

2012 ◽  
Author(s):  
Pattabhi Sitaram ◽  
Sudhir Kaul
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Reliability Analysis ◽  
Design Parameters ◽  
Design Codes ◽  
Engineering Structures ◽  
Finite Element Program ◽  
Holistic Understanding ◽  
Element Program ◽  
Plates And Shells

The application of the principles of probabilistic techniques to structural design has been gaining widespread acceptance over the last two decades. However, the design of many engineering structures is still based on standard deterministic design codes that may not account for inherent design and material variability. Although design codes have been successfully used for many decades, the use of probabilistic design allows a designer to get a more holistic understanding of design variables and a clear assessment of uncertainties. This paper evaluates the reliability of plates and shells made from reinforced concrete (RC) that are commonly used in engineering structures. A modified Monte Carlo approach is used to capture variability in design parameters such as the spacing of the reinforcement, the diameter of the reinforcement and material thickness of the concrete as well as material properties of concrete. The ultimate load carrying capacity is used as the primary failure mode for reliability analysis and the onset of cracking and deflection are also monitored for all the runs that are made for computing reliability. A nonlinear finite element program is used for analysis and the results from the finite element program are used for computing reliability. A sensitivity analysis is performed to determine the most significant parameters influencing the reliability of plates and shells used in this study.

scholarly journals The impact of drilling and slitting construction on damage field: evolution characteristics in low-permeability coal seam

2021 ◽  
Vol 37 ◽  
pp. 205-215
Author(s):  
Heng Chen ◽  
Hongmei Cheng ◽  
Aibin Xu ◽  
Yi Xue ◽  
Weihong Peng
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Damage Mechanics ◽  
Effective Strain ◽  
Secondary Development ◽  
Distribution Area ◽  
Finite Element Program ◽  
Element Program ◽  
Mining Face ◽  
The Impact

ABSTRACT The fracture field of coal and rock mass is the main channel for gas migration and accumulation. Exploring the evolution law of fracture field of coal and rock mass under the condition of drilling and slitting construction has important theoretical significance for guiding efficient gas drainage. The generation and evolution process of coal and rock fissures is also the development and accumulation process of its damage. Therefore, based on damage mechanics and finite element theory, the mathematical model is established. The damage variable of coal mass is defined by effective strain, the elastoplastic damage constitutive equation is established and the secondary development of finite element program is completed by FORTRAN language. Using this program, the numerical simulation of drilling and slitting construction of the 15-14120 mining face of Pingdingshan No. 8 Mine is carried out, and the effects of different single borehole diameters, different kerf widths and different kerf heights on the distribution area of surrounding coal fracture field and the degree of damage are studied quantitatively. These provide a theoretical basis for the reasonable determination of the slitting and drilling arrangement parameters at the engineering site.

Finite Element Analysis on the Deformation of Energy-Saving Wire-Mesh Frame Wallboard

2014 ◽  
Vol 501-504 ◽  
pp. 731-735
Author(s):  
Li Zhang ◽  
Kang Li
Keyword(s):  
Finite Element ◽  
Energy Saving ◽  
Theoretical Basis ◽  
Steel Wire ◽  
Wire Mesh ◽  
Design Parameters ◽  
Element Analysis ◽  
Finite Element Program ◽  
Element Program ◽  
Influence Degree

This paper analyzes the influence degree of related design parameters of wire-mesh frame wallboard on deformation through finite element program, providing theoretical basis for the design and test of steel wire rack energy-saving wallboard.

scholarly journals Numerical Analyses of Earthquake Induced Liquefaction and Deformation Behaviour of an Upstream Tailings Dam

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Muhammad Auchar Zardari ◽  
Hans Mattsson ◽  
Sven Knutsson ◽  
Muhammad Shehzad Khalid ◽  
Maria V. S. Ask ◽  
...  
Keyword(s):  
Finite Element ◽  
Seismic Event ◽  
Deformation Behaviour ◽  
Ground Surface ◽  
Tailings Dam ◽  
Limited Extent ◽  
Northern Sweden ◽  
Finite Element Program ◽  
Dynamic Analyses ◽  
Element Program

Much of the seismic activity of northern Sweden consists of micro-earthquakes occurring near postglacial faults. However, larger magnitude earthquakes do occur in Sweden, and earthquake statistics indicate that a magnitude 5 event is likely to occur once every century. This paper presents dynamic analyses of the effects of larger earthquakes on an upstream tailings dam at the Aitik copper mine in northern Sweden. The analyses were performed to evaluate the potential for liquefaction and to assess stability of the dam under two specific earthquakes: a commonly occurring magnitude 3.6 event and a more extreme earthquake of magnitude 5.8. The dynamic analyses were carried out with the finite element program PLAXIS using a recently implemented constitutive model called UBCSAND. The results indicate that the magnitude 5.8 earthquake would likely induce liquefaction in a limited zone located below the ground surface near the embankment dikes. It is interpreted that stability of the dam may not be affected due to the limited extent of the liquefied zone. Both types of earthquakes are predicted to induce tolerable magnitudes of displacements. The results of the postseismic slope stability analysis, performed for a state after a seismic event, suggest that the dam is stable during both the earthquakes.

A preprocessor for the finite element program SAP IV

1981 ◽  
Vol 17 (12) ◽  
pp. 1779-1789
Author(s):  
E. Haugeneder ◽  
W. Prochazka ◽  
P. Tavolato
Keyword(s):  
Finite Element ◽  
Finite Element Program ◽  
Element Program

Abstract 2871: Saddle-Shaped Annuloplasty Reduces Mitral Leaflet Stress: A Real-Time 3D Echocardiographic Study

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Aaron S Blom ◽  
Chun Xu ◽  
Liam P Ryan ◽  
Benjamin Jackson ◽  
Landi M Parish ◽  
...  
Keyword(s):  
Finite Element ◽  
Real Time ◽  
Stress Reduction ◽  
Heart Association ◽  
Posterior Leaflet ◽  
Volume Data ◽  
Medical Systems ◽  
Annuloplasty Ring ◽  
Finite Element Program ◽  
Element Program

Objectives: High leaflet and chordal stresses contribute to recurrent mitral regurgitation after repair procedures. We hypothesized that a saddle-shaped annuloplasty ring would reduce leaflet stress compared to a similarly sized flat annuloplasty ring. To test this hypothesis we used a novel 3D echocardiographically-based finite element modeling (FEM) technique for quantifying regional mitral valve stress. Methods: Real-time 3D echocardiography was performed in 8 sheep before and after placement of either a 30mm flat annuloplasty (n=4) or a 30mm saddle-shaped annuloplasty. Full-volume data sets of the MV were obtained using an IE33 platform(Philips Medical Systems, Andover, Massachusetts) and exported to Cardio-View (Tomtec Imaging Systems, Munich, Germany) for image analysis. Individual leaflet data were then interpolated using Matlab (The Mathworks, Natick, Massachusetts). Triangulated leaflet surfaces were extracted and the data imported into a commercial finite element program (ABAQUS/Explicit 6.3, HKS Inc. Pawtucket, RI) to quantify regional stress distributions in all segments (P1, P2, P3 and A1, A2, A3) of the MV. Results: Peak anterior and posterior leaflet stresses after flat annuloplasty placement were 0.20±0.001MPa and 21±0.02MPa. Peak anterior and posterior leaflet stress after saddle-shaped annuloplasty placement was 0.19±0.02MPa and 13±0.01MPa (p<0.05 for the posterior leaflet stresses) Conclusions: Saddle-shaped annuloplasty design results in greater stress reduction in the posterior leaflet than standard flat annuloplasty rings and may, therefore, result in more durable repairs. This research has received full or partial funding support from the American Heart Association, AHA Great Rivers Affiliate (Delaware, Kentucky, Ohio, Pennsylvania & West Virginia).

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