Improvement to composite frame systems for seismic and progressive collapse resistance

2019 ◽  
Vol 186 ◽  
pp. 227-242 ◽  
Author(s):  
Xinzheng Lu ◽  
Lei Zhang ◽  
Kaiqi Lin ◽  
Yi Li
Keyword(s):  
Progressive Collapse ◽  
Composite Frame ◽  
Collapse Resistance ◽  
Frame Systems

scholarly journals Experimental Study on the Progressive Collapse Resistance of Two-Storey Half-Scale Fabricated Reinforced Concrete Column-Steel Beam Composite Frame Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Youquan Liu ◽  
Jingang Xiong ◽  
Jiancong Wen
Keyword(s):  
High Speed ◽  
Progressive Collapse ◽  
Experimental Results ◽  
Frame Structure ◽  
Amplification Coefficient ◽  
Space Frame ◽  
Composite Frame ◽  
Weak Part ◽  
Collapse Resistance ◽  
Composite Frame Structure

Progressive collapse behavior of case-in-place concrete and steel frame structures has been extensively investigated over the past years. However, studies on progressive collapse resistance and characteristics of prefabricated RCS composite frame structure (space frame) are limited. In this study, a half-scale prefabricated RCS space frame structure (two-storey, 1 × 2-bay) was designed and manufactured and then tested through the sudden failure of the long-side central column. The weakened part of failure column was rapidly pulled out using vehicle traction force, and displacement was obtained with a dynamic data acquisition instrument supplemented by high-speed camera to record the deformation process of the structure. Additionally, the remaining structure displacement variation and the beam-to-column connections of fem model under progressive collapse were simulated using SAP2000. The FEA results were compared with the experimental results to verify the effectiveness of the numerical analysis. Experimental results demonstrated that the prefabricated RCS composite frame structure designed in accordance with Chinese building codes shows improved resistance to progressive collapse. The dynamic effect demonstrates no significant influence on the prefabricated RCS composite frame structure, and the suggested dynamic amplification coefficient is 1.28. Steel plates (A, B, and C) of the beam-to-column connection are the weak part of the structural failure, and appropriate measures should be applied to strengthen the steel plate of the beam-to-column connection when the prefabricated RCS composite frame structure is designed to resist progressive collapse. SAP2000 FEM program verified that the numerical simulation results are basically consistent with the experimental results.

scholarly journals Retrofit Strategies against Progressive Collapse of Steel Gravity Frames

2020 ◽  
Vol 10 (13) ◽  
pp. 4600 ◽  
Author(s):  
Lei Zhang ◽  
Honghao Li ◽  
Wei Wang
Keyword(s):  
High Speed ◽  
Progressive Collapse ◽  
Steel Structures ◽  
Element Model ◽  
Steel Plates ◽  
Frame Structure ◽  
Composite Frame ◽  
Collapse Resistance ◽  
Simulation Results ◽  
Gravity Frames

Two retrofit strategies, aiming at increasing the collapse resistance of simple connections by adding seat angles and steel plates with long-slotted holes, are proposed in order to address the vulnerability of steel gravity frames under column loss scenarios. A high-fidelity, detailed, finite element model for a planar composite frame is developed and calibrated against experimental data and is used to conduct numerical analysis to explore the effectiveness of the proposed retrofit strategies. The simulation results show that the planar composite frame with enhanced connections exhibits significantly higher collapse resistance and better ductility under column loss scenarios compared with the one with conventional connections. Meanwhile, it is also revealed that the proposed retrofit strategies have an insignificant impact on the behavior of the structural system under earthquakes. These two retrofit strategies are then implemented to retrofit the gravity system of a 10-story, seismically designed steel frame structure, which has been shown to be vulnerable to progressive collapse after an interior gravity column is forcibly removed or impacted by a heavy vehicle with high speed. Numerical simulations were performed using a 3-D micro-based model and the simulation results illustrate that progressive collapse of the structure with enhanced gravity systems is prevented under both scenarios. Therefore, the proposed retrofit strategies are effective in preventing the progressive collapse of existing steel structures employing simple connections.

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.

Progressive collapse resistance of multistory RC frame strengthened with HPFL-BSP

2021 ◽  
pp. 103123
Author(s):  
Hua Huang ◽  
Min Huang ◽  
Wei Zhang ◽  
Mengxue Guo ◽  
Zhen Chen ◽  
...  
Keyword(s):  
Progressive Collapse ◽  
Rc Frame ◽  
Collapse Resistance
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