Analytical studies for the effect of thickness and axial load on load bearing capacity of fire damaged concrete walls with different sizes

Recycled lump concrete (RLC) made with demolished concrete lumps (DCLs) and fresh concrete (FC) provides a solution for effective waste concrete recycling. To promote the development of precast RLC structures, this study tested a new type of connection for precast concrete columns: connecting the upper and the lower halves of columns with bent longitudinal reinforcements and structural adhesive. In this work the behavior of precast RLC columns with the new connection was studied under axial compression. The axial compressive strength of nine two-part columns was tested. The effects of the degree of bending in the longitudinal reinforcement, the replacement ratio of DCLs and the stirrup spacing were investigated. Tests showed that: (1) the failure mode of precast concrete columns is different from that of cast-in-place columns; (2) when the strength of the waste concrete is close to that of the fresh material, there is no significant difference in the axial compression performance of either precast or cast-in-place columns; (3) the bent longitudinal reinforcement causes the axial load bearing capacity of precast concrete columns to be 4.2%–12.3% lower than that of a similar cast-in-place column; (4) reducing the stirrup spacing has little effect on a precast column’s axial load bearing capacity and ductility; (5) when using Chinese and American codes to predict the axial load bearing capacity of the column, the predicted value should be multiplied by a reduction factor.

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EVALUATION OF AXIAL LOAD-BEARING CAPACITY OF CONCRETE COLUMNS STRENGTHENED BY A NEW SECTION ENLARGEMENT METHOD

Journal of Civil Engineering and Management ◽

10.3846/jcem.2021.15855 ◽

2021 ◽

Vol 0 (0) ◽

pp. 1-14

Author(s):

Meijing Hao ◽

Wenzhong Zheng ◽

Wei Chang

Keyword(s):

Bearing Capacity ◽

Axial Load ◽

Large Scale ◽

Prediction Models ◽

Concrete Columns ◽

High Accuracy ◽

Confining Stress ◽

Load Bearing Capacity ◽

Load Bearing ◽

Compressive Loads

The objective of this study is to evaluate the axial load-bearing capacity of section-enlargement concrete columns. To reach the objection, a new strengthened method in which columns are jacketed with a large welded octagonal stirrup at the center and four spiral stirrups at the corners of column is developed. The new section-enlargement method avoids interrupting existing columns and improves the reliability of strengthened part, besides, the confining stress generated by octagonal stirrup and spiral stirrups enhances the compressive strength and deformability of strengthened columns. In addition, sixteen large-scale concrete columns strengthened by the new strengthened method were tested under axial compressive loads. The experimental results show that the axial compression ratio of existing column generates stressstrain lag in strengthened part and decreases the load-bearing capacity of specimens; the stirrups in strengthened part significantly enhance the axial load-bearing capacity of specimens. According to confinement conditions, the cross-section of specimens is divided into five parts and the confinement factor for each part is calculated to establish the prediction models for the load-bearing capacity of specimens. Furthermore, by comparing the results between the developed model and existing models, the developed model has high accuracy in evaluating the load-bearing capacity of strengthened columns.

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Nonlocal axial load-bearing capacity of two neighboring perpendicular single-walled carbon nanotubes accounting for shear deformation

Physica E Low-dimensional Systems and Nanostructures ◽

10.1016/j.physe.2015.06.007 ◽

2015 ◽

Vol 74 ◽

pp. 270-286 ◽

Cited By ~ 1

Author(s):

Keivan Kiani

Keyword(s):

Carbon Nanotubes ◽

Bearing Capacity ◽

Shear Deformation ◽

Axial Load ◽

Single Walled Carbon Nanotubes ◽

Load Bearing Capacity ◽

Load Bearing ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes

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Numerical ANFIS-Based Formulation for Prediction of the Ultimate Axial Load Bearing Capacity of Piles Through CPT Data

Geotechnical and Geological Engineering ◽

10.1007/s10706-018-0445-7 ◽

2018 ◽

Vol 36 (4) ◽

pp. 2057-2076 ◽

Cited By ~ 16

Author(s):

Behnam Ghorbani ◽

Ehsan Sadrossadat ◽

Jafar Bolouri Bazaz ◽

Parisa Rahimzadeh Oskooei

Keyword(s):

Bearing Capacity ◽

Axial Load ◽

Load Bearing Capacity ◽

Load Bearing

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Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

Materials Testing ◽

10.3139/120.111453 ◽

2020 ◽

Vol 62 (1) ◽

pp. 55-60

Author(s):

Per Heyser ◽

Vadim Sartisson ◽

Gerson Meschut ◽

Marcel Droß ◽

Klaus Dröder

Keyword(s):

Bearing Capacity ◽

Load Bearing Capacity ◽

Load Bearing

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Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

Revista de Chimie ◽

10.37358/rc.17.1.5397 ◽

2017 ◽

Vol 68 (1) ◽

pp. 94-100

Author(s):

Oana Tanculescu ◽

Adrian Doloca ◽

Raluca Maria Vieriu ◽

Florentina Mocanu ◽

Gabriela Ifteni ◽

...

Keyword(s):

Bearing Capacity ◽

Fracture Pattern ◽

Load Bearing Capacity ◽

Cross Sectional ◽

Load Bearing ◽

Reinforced Composite ◽

Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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