scholarly journals Gravity Load Collapse of Reinforced Concrete Columns with Brittle Failure Modes

2002 ◽  
Vol 1 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Takaya Nakamura ◽  
Manabu Yoshimura
Keyword(s):  
Reinforced Concrete ◽  
Brittle Failure ◽  
Failure Modes ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Gravity Load

scholarly journals Gravity Load Collapse Behavior of Nonengineered Reinforced Concrete Columns

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Chichaya Boonmee ◽  
Kittipoom Rodsin ◽  
Krissachai Sriboonma
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Axial Load ◽  
Concrete Columns ◽  
Poor Quality ◽  
Load Level ◽  
Longitudinal Reinforcement ◽  
Reinforced Concrete Columns ◽  
Gravity Load ◽  
Collapse Behavior

This paper aims at investigating gravity load collapse behavior of extremely poor quality reinforced concrete columns under cyclic loading. Such columns were usually constructed by local people and may not be designed to meet any of the standards. It was found that their concrete strength may be as low as 5 MPa and the amount of longitudinal reinforcement may be lower than 1%. This type of column is deliberately defined as “nonengineered reinforced concrete column,” or NRCC. During earthquake, the gravity load collapse of the NRCC columns caused a large number of death tolls around the world. In this study, four columns as representative of existing NRCC were tested under cyclic loading. The compressive strength of concrete in order of 5 MPa was used to be representative of columns with poor quality concrete. Two axial load levels of 6 and 18 tons were used to study the influence of axial load level on maximum drift at gravity load collapse. To investigate the effect of bar types on drift capacity, 9 mm round bars were used in two specimens and 12 mm deformed bars were used for the rest of the specimens. The maximum drift before gravity load collapse was very dependent on the axial load level. The maximum drift of the specimens subjected to high axial load (18 tons) was extremely low at approximately 1.75% drifts. The use of deformed bars (associated with larger amount of longitudinal reinforcement) caused the damage to severely dissipate all over the height of the columns. Such damage caused columns to collapse at a lower drift compared to those using round bars. Finally, the plastic hinge model was used to predict the maximum drift of the low strength columns. It was found that the model overly underestimates the drift at gravity load collapse.

An Experiment on Seismic Shear Capacity for HRB500 Grade R/C Frame Columns within Yield Hinge Regions

2011 ◽  
Vol 105-107 ◽  
pp. 948-952
Author(s):  
Pin Wu Guan ◽  
Meng Chen
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Structural Design ◽  
Failure Modes ◽  
Seismic Loading ◽  
Concrete Columns ◽  
Shear Capacity ◽  
Reinforced Concrete Columns ◽  
Seismic Shear

An experiment on shear capacity for HRB500 grade R/C frame columns within yield hinge regions is studied. The different failure modes for specimens within yield hinge regions are classified, and the hysteretic curves are studied. The shear contributions of stirrups and concrete for columns are analyzed in detail. Based on the experimental study, formulas for the shear capacity of reinforced concrete columns are supposed under seismic loading, and the different formulas are adopted to estimate the shear capacity for columns at different seismic levels, Both security and economy of structural design are all considered.

Failure Analysis of Reinforced Concrete Columns after High Temperature

2012 ◽  
Vol 157-158 ◽  
pp. 1578-1581 ◽  
Author(s):  
Li Li Bai ◽  
Tao Song
Keyword(s):  
Reinforced Concrete ◽  
High Temperature ◽  
Failure Analysis ◽  
Failure Modes ◽  
Limit State ◽  
Concrete Columns ◽  
State Equation ◽  
Single Factor ◽  
Reinforced Concrete Columns ◽  
Eccentric Compression

Mechanics models of RC(reinforced concrete) columns is established, after the limit state equation was formed, the failure modes of RC eccentric compression columns after high temperature is analyzed under considering various failure paths. Analysis results indicates that failure analysis is not safe under considering single failure mode, so comprehensive considering failure modes is more matching the true situation than only considering single factor when evaluate reliability of RC eccentric compression columns post-fire

Cumulative Seismic Damage of Reinforced Concrete Columns: Benchmark and Low-Cycle Fatigue Tests

2011 ◽  
Vol 52-54 ◽  
pp. 734-739 ◽  
Author(s):  
Yuan Pan ◽  
Guo Hua Xing ◽  
Guo Fu ◽  
Jian Ling Hou
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Low Cycle Fatigue ◽  
High Stress ◽  
Concrete Columns ◽  
Companion Paper ◽  
Fatigue Tests ◽  
Cumulative Damage ◽  
Cycle Fatigue ◽  
Reinforced Concrete Columns

Under seismic actions, reinforced concrete columns are generally damaged by a combination of repeated stress reversals and high stress excursions. An experimental study was undertaken to investigate cumulative damage in reinforced concrete rectangular columns subjected to repeated cyclic loadings. Fourteen identical half-scale concrete columns were fabricated and tested to failure. This paper summarizes the results of Phase I testing that consisted of benchmark tests to establish the monotonic force-deformation envelope, and constant amplitude tests to determine the low-cycle fatigue characteristics of typical flexural columns. A companion paper will present the results of variable amplitude tests to develop an analytical model of cumulative damage for rectangular reinforced concrete columns. Test observations indicate two potential failure modes: low cycle fatigue of the longitudinal reinforcing bars; and confinement failure due to rupture of the confining hoops. The former failure mode is associated with relatively large displacement amplitudes, while the latter is associated with a larger number of smaller amplitude cycles. A fatigue life expression is developed that can be used in damage-based seismic design of rectangular, flexural concrete columns.

Study on Dynamic Responses and Reinforcement of Reinforced Concrete Columns Subjected to Blast Loading

2015 ◽  
Vol 744-746 ◽  
pp. 315-318
Author(s):  
Hao Du ◽  
Chun Hua Liu
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Blast Loading ◽  
Concrete Columns ◽  
Dynamic Responses ◽  
Stress And Strain ◽  
Reinforced Concrete Columns ◽  
Finite Element Software ◽  
Regional Conflicts ◽  
Blast Resistant Design

The terrorism and regional conflicts posed a threat to the world peace. Some terrorist explosions caused collapse of the buildings, which brought heavy tragedies to the human components. Therefore research on damage of structural components and resistance to damage have become the focus of our attention. Finite element software LS-DYNA was applied to simulating the response of reinforced concrete columns under blast loading. And analysis on dynamic response under different loading period was carried out. By studying on the stress and strain of reinforced concrete columns subjected to blast loading, the possible failure modes were obtained. In addition, the bearing capacities of concrete columns that are reinforced with carbon fiber and steel panel were analyzed, and the reinforcement effects were compared to provide reasonable reinforcement schemes for structures blast-resistant design.

Failure modes of reinforced concrete columns of buildings under debris flow impact

Landslides ◽  
2014 ◽  
Vol 12 (3) ◽  
pp. 561-571 ◽  
Author(s):  
Chao Zeng ◽  
Peng Cui ◽  
Zhiman Su ◽  
Yu Lei ◽  
Rong Chen
Keyword(s):  
Reinforced Concrete ◽  
Debris Flow ◽  
Failure Modes ◽  
Concrete Columns ◽  
Reinforced Concrete Columns
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