Kinked rebar configurations for improving the progressive collapse behaviours of RC frames under middle column removal scenarios

2020 ◽  
Vol 211 ◽  
pp. 110425 ◽  
Author(s):  
Hanlin Qiang ◽  
Jianxiang Yang ◽  
Peng Feng ◽  
Weihong Qin
Keyword(s):  
Progressive Collapse ◽  
Rc Frames ◽  
Column Removal ◽  
Middle Column

scholarly journals Experimental Study on Progressive Collapse Performance of Frame with Specially Shaped Columns Subjected to Middle Column Removal

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Tiecheng Wang ◽  
Qingwei Chen ◽  
Hailong Zhao ◽  
Lei Zhang
Keyword(s):  
Progressive Collapse ◽  
Vertical Displacement ◽  
Internal Force ◽  
Reinforced Concrete Frame ◽  
Concentrated Load ◽  
Concrete Frame ◽  
Gravity Load ◽  
Column Removal ◽  
Arch Action ◽  
Middle Column

A static collapse experiment was carried out to study the progressive collapse resistance and failure mechanisms and modes of a 1/3-scale,2×3-bay, and 2-story reinforced concrete frame with specially shaped columns subjected to middle column removal. A vertical concentrated load was applied to the top of the middle column to simulate the gravity load of the upper floors and the applied load was statically transmitted to the adjacent columns through the frame beams and slabs during the collapse process. The frame collapsed when the vertical displacement of the joint on the top of the failed column reached 170 mm due to the failure of beam-column joints. Based on the experimental phenomena and results, the progressive collapse-resistant behavior of the model frame is analyzed and the redistribution and transition of the load resisting mechanisms are discussed. It is concluded that the redistribution of internal force was mainly realized via the beam resisting mechanism and the compressive arch action in beams played an important role to improve the collapse-resistant capacity.

Progressive collapse resistance of RC T-beam cable subassemblages under a middle-column-removal scenario

2021 ◽  
pp. 102814
Author(s):  
Lu Qiu ◽  
Feng Lin ◽  
Kaicheng Wu ◽  
Xianglin Gu
Keyword(s):  
Progressive Collapse ◽  
Collapse Resistance ◽  
Column Removal ◽  
Column Removal Scenario ◽  
T Beam ◽  
Middle Column

scholarly journals Progressive Collapse Analysis of Three Dimensional Two Bay Five Storey Bare and Infilled Frames under Corner and Middle Column Removal

2019 ◽  
Vol 8 (4) ◽  
pp. 4749-4753
Keyword(s):  
Reinforced Concrete ◽  
Cement Mortar ◽  
Progressive Collapse ◽  
Three Dimensional ◽  
Reinforced Concrete Building ◽  
Infilled Frame ◽  
Finite Element Software ◽  
Column Removal ◽  
Concrete Building ◽  
Middle Column

Demand Capacity Ratio (DCR) assessment of the structural progressive collapse of two bay five storey bare frame without wall load , bare frame with wall load and Infilled frame with cement mortar (IFCM). IN this paper linear static analysis is carried out under corner and middle column removal base on GSA guidelines. Finite element software was used to design two bay five storey reinforced concrete building frame using Indian Standard (IS code). Finally all the three cases according to the progressive collapse resistant behaviour indicator DCR values to investigate in ability in progressive collapse, this present result shows Infilled frame with cement mortar shows to prevent the progressive collapse of Reinforced concrete building

Analytical Investigation of Progressive Collapse Resistance Mechanism in Steel Moment Frame with Fiber Model

2012 ◽  
Vol 166-169 ◽  
pp. 1848-1853 ◽  
Author(s):  
Chuan Qing Liu ◽  
Zuo Yun Mei
Keyword(s):  
Progressive Collapse ◽  
Resistance Mechanism ◽  
Element Model ◽  
Steel Frame ◽  
Frame Structure ◽  
Load Path ◽  
Bending Resistance ◽  
Column Removal ◽  
Steel Frame Structure ◽  
Middle Column

In order to investigate the resistance mechanism of steel frame structure in progressive collapse, an advanced finite element model(FEM) is presented based on fiber beam-column element. Using this FEM, non-linear static pushdown analysis of a ten-story structure was carried out by the alternate load path method, in the two cases that two different columns are removed respectively. Analytical results show that residual structure has the different resistance mechanism for the different column removal case. In the initial stage, bending resistance mechanism can provide dominate resistance capacity in the structural progressive collapse, after both middle and side columns are removed. However, when the bending resistance is out of work, the catenary action is induced in the case of the middle column removal only, which is not developed after the side column is removed. It can be seen that steel frame structure has higher collapse risk in the case of the side column removal than in the case of the middle column removal.

Behaviour of Different Types of Steel Connections in Steel Frames against Progressive Collapse

2011 ◽  
Vol 374-377 ◽  
pp. 1330-1341
Author(s):  
Kang Hai Tan ◽  
Bo Yang
Keyword(s):  
Parametric Study ◽  
Progressive Collapse ◽  
Experimental Tests ◽  
Test Results ◽  
Large Rotation ◽  
Catenary Action ◽  
Column Removal ◽  
Different Types ◽  
Column Removal Scenario ◽  
Middle Column

Firstly, this paper presents an overview of DoD code [1] against progressive collapse and points out the shortcomings of the current design approaches. After that, seven experimental tests of common types of bolted steel beam-column joints under a middle-column removal scenario are presented. This study provides the behaviour and failure modes of different types of connections, including their resistances and rotational capacities in catenary action. The test results indicate that the web cleat connection has the best performance in the development of catenary action. The flush end plate, fin plate and top and seat with web angle (TSWA) connections could also deform in a ductile manner and develop catenary action prior to failure. Numerical simulations have also been conducted. Both static and explicit dynamic solvers were employed to overcome problems of non-convergence, contact, large deformation and fracture simulations. It is demonstrated that the finite element analyses give reasonable accuracy compared to the test results. In addition, an extensive parametric study was undertaken using these validated models to obtain the rotation capacities of various types of connections under catenary action. Finally, some practical design implications have been drawn up from the experimental tests and the parametric study. A new tying resistance expression is proposed to consider the effect of large rotation. If large rotation capacity is not considered in the design stage, the joints with poor rotation capacities would fail to achieve the design tying resistances. In addition, four new connection acceptance criteria of rotation capacities have been proposed to incorporate catenary action under a middle column removal scenario. The work shows that current acceptance criteria of rotation capacities for steel joints such as web cleat, fin plate, flush end plate and TSWA connections, are probably too conservative as they only consider pure flexural resistance.

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