The global collapse resistance capacity of a seismic-damaged SRC frame strengthened with an enveloped steel jacket

Structures ◽  
2021 ◽  
Vol 33 ◽  
pp. 3433-3442
Author(s):  
Chengxiang Xu ◽  
Can Guo ◽  
Qiqi Xu ◽  
Zhao Yang
Keyword(s):  
Steel Jacket ◽  
Collapse Resistance ◽  
Global Collapse

Influence of Reinforcing Steel Post-Capping Strength Deterioration on Collapse Resistance Capacity of a Single-Storey RC Planar Frame

2012 ◽  
Vol 166-169 ◽  
pp. 1801-1806
Author(s):  
Jian Ping Han ◽  
Jun Ping Yang
Keyword(s):  
Earthquake Engineering ◽  
Seismic Analysis ◽  
Frame Structure ◽  
Main Trend ◽  
Reinforcing Steel ◽  
Strength Deterioration ◽  
Analysis And Design ◽  
Collapse Resistance ◽  
Global Collapse ◽  
Deterioration Characteristics

Seismic analysis and design based on collapse probability under intense earthquakes is the main trend in the field of earthquake engineering. Accurate evaluation of collapse resistance capacity is necessary to achieve this target. Due to the accumulated deformation during seismic excitations, structural components would have different stiffness and strength deterioration characteristics. For evaluating the collapse capacity of the structure, it is important to take into account the deterioration characteristics in the analytical model. In this paper, the constitutive models for concrete and reinforcing steel, especially those adopted in OpenSees analytical software, are reviewed first. Then, a reinforced concrete single-storey planar frame structure with one bay is taken as case study and the effect of post-capping strength deterioration of reinforcing steel on evaluation results of global collapse resistance capacity is mainly investigated by incremental dynamic analysis (IDA) via OpenSees software. Analytical results show that global collapse resistance capacity will be significantly overestimated without considering the effect of post-capping strength deterioration of reinforcing steel.

Comparison of steel frames with RWS and WFP beam-to-column connections through seismic fragility analysis

2020 ◽  
pp. 136943322097728
Author(s):  
Haoran Yu ◽  
Weibin Li
Keyword(s):  
Limit State ◽  
Pushover Analysis ◽  
Steel Frames ◽  
Fragility Analysis ◽  
Structural Safety ◽  
Seismic Fragility ◽  
Fe Modelling ◽  
Collapse Resistance ◽  
Seismic Collapse ◽  
Probabilistic Seismic Demand

Reduced web section (RWS) connections and welded flange plate (WFP) connections can both effectively improve the seismic performance of a structure by moving plastic hinges to a predetermined location away from the column face. In this paper, two kinds of steel frames—with RWS connections and WFP connections—as well as different frames with welded unreinforced flange connections were studied through seismic fragility analysis. The numerical simulation was conducted by using multiscale FE modelling. Based on the incremental dynamic analysis and pushover analysis methods, probabilistic seismic demand analysis and seismic capability analysis were carried out, respectively. Finally, combined with the above analysis results, probabilistic seismic fragility analysis was conducted on the frame models. The results showed that the RWS connection and WFP connection (without double plates) have little influence on reducing the maximum inter-storey drift ratio under earthquake action. RWS connections slightly reduce the seismic capability in non-collapse stages and improve the seismic collapse resistance of a structure, which exhibits good structural ductility. WFP connections can comprehensively improve the seismic capability of a structure, but the seismic collapse resistance is worse than that of RWS connections when the structure has a large number of storeys. The frame with WFP connections has a lower failure probability at every seismic limit state, while the frame with RWS connections sacrifices some of its structural safety in non-collapse stages to reduce the collapse probability.

scholarly journals Experimental Research on Reinforced Concrete Columns Strengthened with Steel Jacket and Concrete Infill

2021 ◽  
Vol 11 (9) ◽  
pp. 4043
Author(s):  
Aleksandar Landović ◽  
Miroslav Bešević
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Experimental Research ◽  
Failure Modes ◽  
Steel Tube ◽  
Rc Columns ◽  
Rc Column ◽  
Steel Jacket ◽  
Ductile Behavior

Experimental research on axially compressed columns made from reinforced concrete (RC) and RC columns strengthened with a steel jacket and additional fill concrete is presented in this paper. A premade squared cross-section RC column was placed inside a steel tube, and then the space between the column and the tube was filled with additional concrete. A total of fourteen stub axially compressed columns, including nine strengthened specimens and five plain reinforced concrete specimens, were experimentally tested. The main parameter that was varied in the experiment was the compressive strength of the filler concrete. Three different concrete compression strength classes were used. Test results showed that all three cross-section parts (the core column, the fill, and the steel jacket) worked together in the force-carrying process through all load levels, even if only the basic RC column was loaded. The strengthened columns exhibited pronounced ductile behavior compared to the plain RC columns. The influence of the test parameters on the axial compressive strength was investigated. In addition, the specimen failure modes, strain development, and load vs. deformation relations were registered. The applicability of three different design codes to predict the axial bearing capacity of the strengthened columns was also investigated.

scholarly journals Study on progressive collapse resistance of single-layer reticulated shells

2021 ◽  
Vol 1777 (1) ◽  
pp. 012037
Author(s):  
R Han ◽  
T Y Yin ◽  
X D Yang ◽  
Y Zhang ◽  
Y S Zhang ◽  
...  
Keyword(s):  
Progressive Collapse ◽  
Single Layer ◽  
Collapse Resistance

Progressive collapse resistance of framed buildings with partially encased composite beams

2021 ◽  
Vol 38 ◽  
pp. 102228
Author(s):  
Gianrocco Mucedero ◽  
Emanuele Brunesi ◽  
Fulvio Parisi
Keyword(s):  
Progressive Collapse ◽  
Composite Beams ◽  
Collapse Resistance

scholarly journals Analysis of the robustness of a steel frame structure with composite floors subject to multiple fire scenarios

2021 ◽  
pp. 136943322199249
Author(s):  
Riza Suwondo ◽  
Lee Cunningham ◽  
Martin Gillie ◽  
Colin Bailey
Keyword(s):  
Progressive Collapse ◽  
Three Dimensional ◽  
Steel Structure ◽  
Frame Structure ◽  
Worst Case ◽  
Collapse Resistance ◽  
Fire Scenarios ◽  
Element Approach ◽  
The One ◽  
Steel Frame Structure

This study presents robustness analyses of a three-dimensional multi-storey composite steel structure under the action of multiple fire scenarios. The main objective of the work is to improve current understanding of the collapse resistance of this type of building under different fire situations. A finite element approach was adopted with the model being firstly validated against previous studies available in the literature. The modelling approach was then used to investigate the collapse resistance of the structure for the various fire scenarios examined. Different sizes of fire compartment are considered in this study, starting from one bay, three bays and lastly the whole ground floor as the fire compartment. The investigation allows a fundamental understanding of load redistribution paths and member interactions when local failure occurs. It is concluded that the robustness of the focussed building in a fire is considerably affected by the size of fire compartments as well as fire location. The subject building can resist progressive collapse when the fire occurs only in the one-bay compartment. On the other hand, total collapse occurs when fire is located in the edge three-bay case. This shows that more than one fire scenario needs to be taken into consideration to ensure that a structure of this type can survive from collapse in the worst-case situation.

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