scholarly journals An innovation for flat traditional conventional footing

2021 ◽  
Vol 23 (07) ◽  
pp. 358-364
Author(s):  
Aakriti Sharma ◽  
◽  
Dr. Prashant Garg ◽  
Amandeep Singh ◽  
◽  
...  
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Experimental Studies ◽  
Failure Surface ◽  
Good Method ◽  
Test Results ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Shell Foundation ◽  
Shell Foundations

Since their inception in the 1950s, shell foundations have grown in popularity over regular ones. In this paper, the ultimate load capacities of shell foundations on clay were determined by Numerical model tests. The results were compared with those for flat foundations with the same base. The model test results were found using finite element analysis using the program PLAXIS 2D. The experimental studies indicated that the ultimate load capacity of shell footing on clay is higher than that on flat-footing and the load settlement curves were significantly modified. The shell foundation over clay can be considered a good method to decrease the resulting settlement and material consumption at different thicknesses. Also, the rupture surface of the shell upright and inverted system was significantly deeper than both normal footings. The numerical analysis helps in understanding the deformation behavior of the studied systems and identifies the failure surface of upright and inverted shell footing.

scholarly journals Finite Element Analysis of Cracked One-Way Bubbled Slabs Strengthened By External Prestressed Strands

2021 ◽  
Vol 27 (1) ◽  
pp. 45-65
Author(s):  
Falah Hassan Ibrahim ◽  
Ali Hussein Ali
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
The Other ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Line Load ◽  
External Prestressing ◽  
Service Charge ◽  
External Strengthening ◽  
Initial Capacity

Bubbled slabs can be exposed to damage or deterioration during its life. Therefore, the solution for strengthening must be provided. For the simulation of this case, the analysis of finite elements was carried out using ABAQUS 2017 software on six simply supported specimens, during which five are voided with 88 bubbles, and the other is solid. The slab specimens with symmetric boundary conditions were of dimensions 3200/570/150 mm. The solid slab and one bubbled slab are deemed references. Each of the other slabs was exposed to; (1) service charge, then unloaded (2) external prestressing and (3) loading to collapse under two line load. The external strengthening was applied using prestressed wire with four approaches, which are L1-E, L2-E, L1-E2, and L2-E2, where the lengths and eccentricities of prestressed wire are (L1=1800, L2=2400, E1=120 and E2=150 mm). The results showed that each reinforcement approach restores the initial capacity of the bubbled slab and improves it in the ultimate load capacity aspect. The minimum and maximum ultimate strength of strengthened cracked bubbled slab increased by (17.3%-64.5%) and (25.7%-76.3%) than solid and bubbled slab, respectively. It is easier to improve behavior with an increased eccentricity of the prestressed wire than to increase its length.

Vertical load-carrying behavior and design models for micropiles considering foundation configuration conditions

2017 ◽  
Vol 54 (2) ◽  
pp. 234-247 ◽  
Author(s):  
Doohyun Kyung ◽  
Daehong Kim ◽  
Garam Kim ◽  
Junhwan Lee
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Initial Increase ◽  
Vertical Load ◽  
Test Results ◽  
Ultimate Load Capacity ◽  
Case Examples ◽  
Installation Angle ◽  
Load Carrying ◽  
Load Tests

In the present study, the vertical load-carrying behavior of micropile foundations with various configuration conditions was investigated based on results from model load tests. Considered configuration conditions included micropile inclination angle, spacing of micropiles, and types of micropile foundations. The ultimate load capacity of micropiles varied with installation angle, showing an initial increase and peak followed by a gradual decrease with further increase in installation angle. The ultimate load capacity of micropiled rafts was affected by both installation angle and micropile spacing. The load-carrying mechanism of micropiles for the inclined condition was proposed based on the decomposed axial and lateral load and resistance components. Using the proposed load-carrying mechanism and test results obtained in this study, the load capacity ratio for an inclined micropile was proposed. The group effect and interaction effect factors for group micropiles and micropiled rafts were proposed, respectively, all of which can be used to estimate the load-carrying capacity of micropile foundations. Field load tests were conducted and it was seen that estimated results using the proposed method were in good agreement with measured results. Additional comparison with case examples from the literature also confirmed the validity of the proposed method.

scholarly journals Finite Element Analysis of Cracked One-Way Bubbled Slabs Strengthened By External Prestressed Strands

2021 ◽  
Vol 27 (1) ◽  
pp. 45-65
Author(s):  
Falah Hassan Ibrahim ◽  
Ali Hussein Ali
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
The Other ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Line Load ◽  
External Prestressing ◽  
Service Charge ◽  
External Strengthening ◽  
Initial Capacity

Bubbled slabs can be exposed to damage or deterioration during its life. Therefore, the solution for strengthening must be provided. For the simulation of this case, the analysis of finite elements was carried out using ABAQUS 2017 software on six simply supported specimens, during which five are voided with 88 bubbles, and the other is solid. The slab specimens with symmetric boundary conditions were of dimensions 3200/570/150 mm. The solid slab and one bubbled slab are deemed references. Each of the other slabs was exposed to; (1) service charge, then unloaded (2) external prestressing and (3) loading to collapse under two line load. The external strengthening was applied using prestressed wire with four approaches, which are L1-E, L2-E, L1-E2, and L2-E2, where the lengths and eccentricities of prestressed wire are (L1=1800, L2=2400, E1=120 and E2=150 mm). The results showed that each reinforcement approach restores the initial capacity of the bubbled slab and improves it in the ultimate load capacity aspect. The minimum and maximum ultimate strength of strengthened cracked bubbled slab increased by (17.3%-64.5%) and (25.7%-76.3%) than solid and bubbled slab, respectively. It is easier to improve behavior with an increased eccentricity of the prestressed wire than to increase its length.

scholarly journals The Assessment of Using CFRP to Enhance the Behavior of High Strength Reinforced Concrete Corbels

2021 ◽  
Vol 28 (1) ◽  
pp. 71-83
Author(s):  
Mazin Abdulrahman ◽  
Shakir Salih ◽  
Rusul Abduljabbar
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Strength ◽  
Load Capacity ◽  
High Strength ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Ultimate Load Capacity ◽  
Load Carrying ◽  
Externally Bonded ◽  
Effective Depth

In this research, an experimental study is conducted to investigate the behavior and strength of high strength reinforced concrete corbels externally bonded with CFRP fabric sheets and Plates with different patterns taking into account the effect of adopted variables in enhancing the ultimate strength; the effect of shear span to effective depth (a/d), configuration, type and amount of bonding. Eleven high strength reinforced corbels were cast and tested under vertical loads. Test results showed there was an improvement in the behavior and load carrying capacity of all strengthened corbels. An increasing in the ultimate strength of strengthened corbel by inclined CFRP strips reached to (92.1%) while the increasing reached to (84.21%) for using one horizontal CFRP Plates compared to un-strengthened reference specimen. Also, it can be conducted that the increase of (a/d) ratio from (0.6 to 0.8) resulted in decreasing by 21.05% in ultimate load capacity of corbels and from (0.4 to 0.6) by 31.25% and 58.69% in cracking and ultimate loads respectively Using CFRP .

Discussion of “Ultimate Load Capacity of Arch Dams”

1967 ◽  
Vol 93 (3) ◽  
pp. 259-267
Author(s):  
Marek Janas ◽  
Lance A. Endersbee ◽  
M.L. Juncosa ◽  
K.V. Swaminathan ◽  
A. Rajaraman
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Ultimate Load Capacity ◽  
Arch Dams

Performance of Reinforced Concrete Beams with Multiple Openings

2020 ◽  
Vol 857 ◽  
pp. 162-168
Author(s):  
Haidar Abdul Wahid Khalaf ◽  
Amer Farouk Izzet
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
Concrete Beams ◽  
Load Capacity ◽  
Reinforced Concrete Beams ◽  
Design Parameters ◽  
Ultimate Load Capacity ◽  
Concentrated Load ◽  
Simply Supported ◽  
Group I

The present investigation focuses on the response of simply supported reinforced concrete rectangular-section beams with multiple openings of different sizes, numbers, and geometrical configurations. The advantages of the reinforcement concrete beams with multiple opening are mainly, practical benefit including decreasing the floor heights due to passage of the utilities through the beam rather than the passage beneath it, and constructional benefit that includes the reduction of the self-weight of structure resulting due to the reduction of the dead load that achieves economic design. To optimize beam self-weight with its ultimate resistance capacity, ten reinforced concrete beams having a length, width, and depth of 2700, 100, and 400 mm, respectively were fabricated and tested as simply supported beams under one incremental concentrated load at mid-span until failure. The design parameters were the configuration and size of openings. Three main groups categorized experimental beams comprise the same area of openings and steel reinforcement details but differ in configurations. Three different shapes of openings were considered, mainly, rectangular, parallelogram, and circular. The experimental results indicate that, the beams with circular openings more efficient than the other configurations in ultimate load capacity and beams stiffness whereas, the beams with parallelogram openings were better than the beams with rectangular openings. Commonly, it was observed that the reduction in ultimate load capacity, for beams of group I, II, and III compared to the reference solid beam ranged between (75 to 93%), (65 to 93%), and (70 to 79%) respectively.

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