Stress Analysis and Field Test of Buried Pipeline under Traffic Load

2021 ◽  
Keyword(s):  
Stress Analysis ◽  
Field Test ◽  
Traffic Load ◽  
Buried Pipeline

scholarly journals Evaluation of Finite Element Software for Pavement Stress Analysis

2021 ◽  
Author(s):  
Huan Chen
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Concrete Slab ◽  
Flexible Pavement ◽  
Empirical Method ◽  
Future Trend ◽  
Traffic Load ◽  
Rigid Pavement ◽  
Finite Element Software ◽  
Pavement Engineering

Different approaches are usually taken when designing flexible and rigid pavement: the rigid concrete slab carries major portion of the traffic load; while for flexible pavement, external loads are distributed to the subgrade because of the relatively low modulus of elasticity of asphalt layer comparing to concrete in the case of rigid pavement. Pavement engineering has gone through major developments; the transition from Empirical Design Method to Mechanistic-Empirical Methods is becoming a near-future trend. The Mechanistic-Empirical Method has two components: (1) stress, strain and deflection are calculated based on analyzing mechanical characteristics of materials; (2) critical pavement distresses are quantitatively predicted by experimental calibrated equations. Hence, stress analysis has become an important role in pavement engineering. The most practical and widely used stress analysis method for flexible pavement is Burmister's Elastic Layered Theory; and for analyzing rigid pavement is Finite Element Method. KENSLABS and STAAD-III are both Finite Element software; KENSLABS is designed specifically for concrete pavement stress analysis, therefore it is more user-frielndly for pavement design; STAAD-III is more suitable for general plane and space structures. The project compares the use of both software for stress analysis in rigid pavement in term of simplicity and precision.

scholarly journals Evaluation of Finite Element Software for Pavement Stress Analysis

2021 ◽  
Author(s):  
Huan Chen
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Concrete Slab ◽  
Flexible Pavement ◽  
Empirical Method ◽  
Future Trend ◽  
Traffic Load ◽  
Rigid Pavement ◽  
Finite Element Software ◽  
Pavement Engineering

Different approaches are usually taken when designing flexible and rigid pavement: the rigid concrete slab carries major portion of the traffic load; while for flexible pavement, external loads are distributed to the subgrade because of the relatively low modulus of elasticity of asphalt layer comparing to concrete in the case of rigid pavement. Pavement engineering has gone through major developments; the transition from Empirical Design Method to Mechanistic-Empirical Methods is becoming a near-future trend. The Mechanistic-Empirical Method has two components: (1) stress, strain and deflection are calculated based on analyzing mechanical characteristics of materials; (2) critical pavement distresses are quantitatively predicted by experimental calibrated equations. Hence, stress analysis has become an important role in pavement engineering. The most practical and widely used stress analysis method for flexible pavement is Burmister's Elastic Layered Theory; and for analyzing rigid pavement is Finite Element Method. KENSLABS and STAAD-III are both Finite Element software; KENSLABS is designed specifically for concrete pavement stress analysis, therefore it is more user-frielndly for pavement design; STAAD-III is more suitable for general plane and space structures. The project compares the use of both software for stress analysis in rigid pavement in term of simplicity and precision.

Nonlinear Finite Element Research for the Rutting of Asphalt Pavement Base on Shear Stress Analysis

2011 ◽  
Vol 97-98 ◽  
pp. 91-94
Author(s):  
Yi Dong ◽  
Miao Juan Peng ◽  
Yong Qi Ma ◽  
Wei Feng
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Stress Analysis ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Middle Layer ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Traffic Load ◽  
Pavement Base

In this paper, visco-elastic-plasticity theory is employed to establish a nonlinear finite element model of the asphalt mixture pavement. The influence of pavement structure, the ability of rutting resistance of middle layer and traffic load on shear stress distribution for asphalt pavement are discussed. The numerical results show that shear stress analysis can be used to analyze the rutting of asphalt pavement. The asphalt materials of middle layer have a great impact on rutting and shear stress. Modified asphalt is a useful middle layer material to decrease the rutting, and the hard asphalt is also an economical material to reduce rutting. Overload and overpressure easily cause pavement rutting damage. Pavement longitudinal grade is not the main reason leading to rutting at the long slope, but brake frequently in the long slope is the real cause of rutting.

scholarly journals Stress Analysis of Buried Gas Pipeline Traversing Sliding Mass

2014 ◽  
Vol 8 (1) ◽  
pp. 257-261 ◽  
Author(s):  
Liqiong Chen ◽  
Shijuan Wu ◽  
Hongfang Lu ◽  
Kun Huang ◽  
Yitang Lv ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Gas Pipeline ◽  
Buried Pipeline ◽  
Gas Pipelines ◽  
Pipeline Failure ◽  
Buried Gas Pipeline

Landslides are one of the primary dangers associated with gas pipelines. Pipeline spans can be divided into two categories: longitudinally traversing and laterally traversing. The load brought on by a landslide can cause pipeline failure, thus stress analysis of both ways of traversing is of great necessity. Through stress analysis, the junction of the conventional buried pipeline and the landslide has been confirmed as coming under the heaviest loads. Therefore, stress checks against accidental loads should be emphasized during the stress analysis of gas pipelines traversing sliding masses.

Field Test and Analysis for Environmental Vibration Induced by Road Traffic Load

2013 ◽  
Vol 482 ◽  
pp. 183-187
Author(s):  
Xin Feng Fang ◽  
Dong Li
Keyword(s):  
Attenuation Coefficient ◽  
Field Test ◽  
Road Traffic ◽  
Vertical Direction ◽  
Ground Vibration ◽  
Urban Traffic ◽  
Traffic Load ◽  
Vibration Source ◽  
Environmental Vibration ◽  
The Time Domain

To study environmental vibration problems caused by urban traffic, field test of ground vibration induced by the traffic load were carried out on a city road and attenuation of the vibration was analyzed from the time domain. Used MATLAB software to curve fitting attenuation coefficient to calculate the variation of vibration with depth. The vibration with depth was analyzed through the attenuation coefficient. The results show that the environmental vibration caused by road traffic load was mainly in vertical direction. In addition, environmental vibration in the transverse and vertical directions were both gradually decreasing with the increase of the distance from vibration source. Vibration attenuation was rapidly reduced within 10m and there was almost no vibration in 57 m.

Numerical investigation of soil–pipeline system behavior nearby unsupported excavation in saturated and unsaturated glacial till

2019 ◽  
Vol 56 (1) ◽  
pp. 69-88 ◽  
Author(s):  
Mohammed Al-Khazaali ◽  
Sai K. Vanapalli ◽  
Won Taek Oh
Keyword(s):  
Stress Analysis ◽  
Effective Stress ◽  
Unsaturated Soils ◽  
Economic Losses ◽  
Internal Stresses ◽  
Pipeline System ◽  
Buried Pipeline ◽  
Pipeline Systems ◽  
Effective Stress Analysis ◽  
Internal Forces

Buried pipeline systems form vital infrastructure, all over the world, to transport resources such as water, oil, and gas from the production stage to the locations of consumption. Failure or rupture in pipelines in general and oil or gas pipelines in particular lead to not only economic losses that are expensive, but also cause extensive damage to the environment in several scenarios. One of the key reasons for buried pipeline systems failure is associated with excavation or soil trenching within the proximity of pipelines. Soil deformation associated with excavation causes relative displacement between the pipeline and the surrounding soil, which contributes to external as well as internal stresses and strains on the pipelines. In this study, numerical analyses are carried out to investigate the behaviors of buried rigid and flexible pipelines by extending the effective stress analysis and the modified effective stress analysis approaches for saturated and unsaturated soils, respectively. The pipe displacement, strains, and internal force results from the study suggest that soil trenching in unsaturated soils contribute to limited deformations within the proximity of the embedded pipelines and result in lower internal forces. The proposed methodology can be used to determine the safe depths of unsupported excavations in unsaturated soils without causing excessive strains or internal forces in the ring of rigid and flexible pipes.

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