ISSN (Print): 2328-398X

ISSN (Online): 2328-3998

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Article

Analytical Modeling of Large-Scale Testing of Axial Pipe-Soil Interaction in Ultra-Soft Soil

1Civil and Environmental Engineering Department, University of Houston, TX, USA

2Civil Engineering Department, University of Kirkuk, Kirkuk, Iraq


American Journal of Civil Engineering and Architecture. 2016, 4(3), 98-105
doi: 10.12691/ajcea-4-3-5
Copyright © 2016 Science and Education Publishing

Cite this paper:
Mohammad S. Joshaghani, Aram M. Raheem, M.M. Reza Mousavi. Analytical Modeling of Large-Scale Testing of Axial Pipe-Soil Interaction in Ultra-Soft Soil. American Journal of Civil Engineering and Architecture. 2016; 4(3):98-105. doi: 10.12691/ajcea-4-3-5.

Correspondence to: Aram  M. Raheem, Civil Engineering Department, University of Kirkuk, Kirkuk, Iraq. Email: engaram@yahoo.com

Abstract

In this study, large-scale model test with dimensions of 2.4 m*2.4 m*1.8 m has been designed to investigate the behavior of axial pipe-soil interaction on the simulated ultra-soft seabed. Large-scale tests were performed on plastic pipes by loading the pipe from the ends, placed on ultra-soft clayey soil with undrained shear strength ranged from 0.01 kPa to 0.1 kPa, to quantify the axial soil-pipe interaction. An accurate remote gridding system was developed for displacement measurement. Two new models were used to correlate the shear strength with the water content of the ultra-soft soil. The models were verified with data points reported in the literature and experimental tests performed in the laboratory. The shear strength was correlated strongly with water content of ultra-soft soil with coefficient of correlation (R2) up to 0.91. Moreover, new analytical models were established to predict the axial break-out resistance and large-displacement residual resistance in ultra-soft soil. The new models have taken into account the effects of vertical loads (W), normalized initial embedment (δin), boundary length (λ), and the rate of axial loading (Vp). The new models have shown very good predictions for the experimental results with coefficient of correlation (R2) up to 0.87. Also, a new analytical model (p-q-m) was proposed to predict the force-displacement relationship for axial testing of pipe-soil interaction. This new model (p-q-m) has also shown a very good agreement with the experimental testing results for the full force-displacement response of pipe soil interaction. Detailed statistical procedure has been used to analyze the performance of both p-q and p-q-m models. The modified p-q model presents better estimation using any of the statistical methods.

Keywords

References

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Article

Assessment of Turbo and Multilane Roundabout Alternatives to Improve Capacity and Delay at a Single Lane Roundabout Using Microsimulation Model Vissim: A Case Study in Ghana

1Graduate student Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

2Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana


American Journal of Civil Engineering and Architecture. 2016, 4(4), 106-116
doi: 10.12691/ajcea-4-4-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Osei Kwame Kwakwa, Charles Anum Adams. Assessment of Turbo and Multilane Roundabout Alternatives to Improve Capacity and Delay at a Single Lane Roundabout Using Microsimulation Model Vissim: A Case Study in Ghana. American Journal of Civil Engineering and Architecture. 2016; 4(4):106-116. doi: 10.12691/ajcea-4-4-1.

Correspondence to: Charles  Anum Adams, Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. Email: carladams1702@yahoo.com

Abstract

A single lane roundabout characterized by long queues during morning and evening peak periods was chosen as our study site. The objective of this study was to 1) Model and calibrate the vissim simulation model for the roundabout and 2) to model roundabout alternatives to improve capacity and assess the delay. A two hour video data collection was undertaken on a typical morning peak from which the traffic demand and turning movement data were extracted. The vissim micro simulation model was calibrated using the west approach as the target and the analysis was done for the existing single lane roundabout. A Turbo roundabout and a conventional double lane roundabout alternatives were also assessed. The capacity of the single lane roundabout was estimated as 2990 pcu/h and was performing at an ICU level of service H. Average Delay on the west approach was 232 seconds. The intersection capacity was 4392 pcu/h when the turbo roundabout alternative was assessed. Westbound vehicles experienced average delay of 87 seconds (inner lane) and 74 seconds (outer lane). The capacity of the conventional double lane roundabout was estimated to be 3690 pcu/h. The turbo roundabout concept will deliver a comparatively higher capacity and could be the most effective alternative to reduce congestion and delay.

Keywords

References

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Article

Durability and Fire Resistance of Laterite Rock Concrete

1Department of Civil Engineering, Rivers State University of Science and Technology, Port-Harcourt, Nigeria

2Department of Civil Engineering, Auchi Polythechnic, Auchi, Edo State, Nigeria

3Department of Civil Engineering, University of Port Harcourt, Port Harcourt, Nigeria


American Journal of Civil Engineering and Architecture. 2016, 4(4), 117-124
doi: 10.12691/ajcea-4-4-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Ephraim M. E., Adoga E.A., Rowland-Lato E. O.. Durability and Fire Resistance of Laterite Rock Concrete. American Journal of Civil Engineering and Architecture. 2016; 4(4):117-124. doi: 10.12691/ajcea-4-4-2.

Correspondence to: Rowland-Lato  E. O., Department of Civil Engineering, University of Port Harcourt, Port Harcourt, Nigeria. Email: rowlandlato@yahoo.com

Abstract

The ability of a structure to retain its structural integrity in adverse conditions of weather and fire out break depends on its durability and fire resistance. This research work investigated these indispensable properties in Laterite Rock Concrete to assess its usability structural concrete. Durability was investigated in terms of water absorption, density, shrinkage and fire resistance. Fire resistance test was carried out using direct fire test. Two mix proportions: 1:2:4 and 1:1½:3 were tested at optimum water/cement ratio of 0.6 and 0.55 for 1:2:4 and 1:1½:3 mixes respectively. From the results, it is concluded that the concrete is durable, environmentally compatible and possesses high fire resistance properties, having satisfied the relevant codes requirements. The 1:2:4 and 1:1½:3 conform to the specifications for grades 15 and 20 correspondingly. Recommendations include specifications for designing structural elements using the Laterite Rock Concrete.

Keywords

References

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