Behavior of Raft Foundation Built on Layered Soil under Different Earthquake Excitation

Ali, Alyaa H.; Abbas, Hassan Obaid; Abed-Awn, S. H.

doi:10.5829/ije.2022.35.08b.07

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Standard boundary conditions of the three-dimensional modelling have been considered in the analysis, where the bottom of the model is fully fixed, and the sides of the model are allowed to move in the vertical direction only. These boundary conditions have been repeatedly used in the three-dimensional finite element analysis of soil structure interaction problems [27][28][29][30][31].…”

Section: Materials Modelling and Propertiesmentioning

confidence: 99%

Influence of Using Tire-Derived Aggregate on the Structural Performance of Buried Concrete Pipe under Embankment Load

2022

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Induced trench method is a well-known technique usually used to reduce the soil pressure applied on buried pipes. This method involves the use of a lightweight compressible material above the buried pipe to increase the positive arching, and thus, to decrease the soil pressure applied on the buried pipe. However, little efforts have been given by previous studies to check the applicability of using tire-derived aggregate (TDA) as the light weight and compressible material in the induced trench method, where it is not clear if the TDA could be used to increase the positive arching for the case of concrete pipes with different diameters and backfill heights. Thus, this paper investigates the effect of using TDA on the structural performance of buried concrete pipes subjected to soil load using a validated three-dimensional finite element model. A sensitivity analysis has been carried out to examine the effect of the configuration of the TDA, backfill height, and pipe diameter on the performance of the TDA in reducing the pipe wall bending moment. It was found that increasing the backfill height decreases the performance of the TDA. Furthermore, increasing the pipe diameter up to 1.2 m increases the TDA performance. However, the performance of the TDA significantly reduces as the diameter increases from 1.2 m to 2.4 m. In addition, it was also observed that the TDA configuration has a remarkable influence on its performance, where it is necessary to place the TDA layer on top of the pipe crown to increase the positive arching. The results reported in this paper provide useful addition to the literature and will help designers to ensure the economic design of buried pipes using recyclable materials.

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Section: Materials Modelling and Propertiesmentioning

confidence: 99%

Influence of Using Tire-Derived Aggregate on the Structural Performance of Buried Concrete Pipe under Embankment Load

2022

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Predicting lateral displacement of sand for mat foundation under simplified seismic loading

Haque

2024

Discov Civ Eng

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This research presents the settlement factor of sand for the lateral seismic excitation considering various peak ground accelerations. For this reason, analytical formulations are proposed to calculate the settlement factor. A one-dimensional model is considered to derive these formulations, which is the simplified form of the three-dimensional model. The seismic excitation is simplified by considering only peak ground acceleration (PGA) for the development of formulations. The proposed formulations are verified by the previous numerical studies. Also, a parametric study is conducted to consider the variable parameters such as super-structure loads, mat thickness, PGA factors, and depths of sand. According to the verification results, the observed and calculated sand settlement factor variation rates are slightly higher because of the considerations for the development of the proposed model. The maximum value of the sand settlement factor is found to be 434 for the PGA factor of 0.36 at the highest depth of the sand layer. Also, the sand settlement factor is gradually increased with the increment of the depth for all cases due to the increment of the stiffness. The lateral sand settlement factor is varied within a range of (60 ~ 434) considering all PGAs of the lateral seismic excitation.

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Optimization Design of Phononic Crystals Based on BPNN‐MPA in Applied Mathematical Analysis

2024

Journal of Applied Mathematics

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Traditional finite element analysis methods have the problem of expensive and unstable band structure diagram calculation when generating phononic crystals. Therefore, this study combines back propagation neural networks with ocean predator algorithms to optimize the geometric structure of phononic crystals. The results show that the coefficient of determination for the predicted bandgap width and lower bound of Model 3 is 1.00, which is better than the comparison model. However, Models 2 and 5 have poor predictive performance for bandgap width due to overfitting during actual training. Therefore, after using the ocean predator algorithm for hyperparameter adjustment, it is found that the maximum number of failures in the validation set of Model 5 is 30, the number of hidden layer nodes is 30, and after 500 experiments, the average error of the bandgap width is 5.26%, and the average error of the lower bound of the bandgap is 1.33%. The average error of the bandgap width after hyperparameter adjustment is 4.89%, and the average error of the lower bound of the bandgap is 1.21%, both of which are effectively reduced and better than the comparison model. Overall, the combination model has high computational efficiency and stability in phononic crystal optimization and can be practically applied in the design and optimization of phononic crystal geometric structures.

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Behavior of Raft Foundation Built on Layered Soil under Different Earthquake Excitation

Cited by 5 publications

References 7 publications

Influence of Using Tire-Derived Aggregate on the Structural Performance of Buried Concrete Pipe under Embankment Load

Influence of Using Tire-Derived Aggregate on the Structural Performance of Buried Concrete Pipe under Embankment Load

Predicting lateral displacement of sand for mat foundation under simplified seismic loading

Optimization Design of Phononic Crystals Based on BPNN‐MPA in Applied Mathematical Analysis

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