scholarly journals Study on Progressive Collapse Behavior of SRC Column-Steel Beam Hybrid Frame Based on Pushdown Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Liusheng Chu ◽  
Gaoju Li ◽  
Danda Li ◽  
Jun Zhao
Keyword(s):  
Progressive Collapse ◽  
Bending Moment ◽  
Small Deformation ◽  
Vertical Position ◽  
Steel Beam ◽  
Practical Applications ◽  
Collapse Resistance ◽  
Beam Mechanism ◽  
Collapse Behavior ◽  
Pushdown Analysis

To investigate the progressive collapse behavior of Steel Reinforced Concrete (SRC) column-steel beam hybrid frame after the failure of key structural elements, a PQ-Fiber model for an 8-storey structure is established in ABAQUS program. Nonlinear dynamic and static pushdown analysis are carried out after the failure and removal of the bottom-middle and bottom-corner columns. Numerical results of both methods agree well with each other. Results show that SRC column-steel frame has good resistance to progressive collapse under dynamic instantaneous load. After sudden removal of a bottom middle column, the development of structural collapse exhibits two mechanisms, the beam mechanism and the catenary mechanism. When the structure is within small deformation range, the collapse resistance of the residual frame is provided by the beam bending moment capacity, which is beam mechanism. For large deformation situation, the collapse resistance is mainly provided by the beam tensile strength, which is catenary mechanism. However, with the removal of a bottom corner column, the residual structure only undergoes the beam mechanism even for large deformations. For future practical applications, the influence of the steel ratio, steel section size, and the vertical position of the removed key components are investigated through a detailed parametric study.

scholarly journals An Overview of Progressive Collapse Behavior of Steel Beam-to-Column Connections

2020 ◽  
Vol 10 (17) ◽  
pp. 6003 ◽  
Author(s):  
Iman Faridmehr ◽  
Mohammad Hajmohammadian Baghban
Keyword(s):  
Progressive Collapse ◽  
Full Scale ◽  
Design Parameters ◽  
Steel Beam ◽  
Test Results ◽  
End Plate ◽  
Depth Ratio ◽  
Seat Angle ◽  
Extended End Plate ◽  
Collapse Behavior

Local failure of one or more components due to abnormal loading can induce the progressive collapse of a building structure. In this study, by the aid of available full-scale test results on double-span systems subjected to the middle column loss scenario, an extensive parametric study was performed to investigate the effects of different design parameters on progressive collapse performance of beam-to-column connections, i.e., beam span-to-depth ratio, catenary mechanism, and connection robustness. The selected full-scale double-span assemblies consisted of fully rigid (welded flange-welded web, SidePlate), semi-rigid (flush end-plate, extended end-plate), and flexible connections (top and seat angle, web cleat). The test results, including load-deformation responses, development of the catenary mechanism, and connection robustness, are presented in detail. The finding of this research further enables a comprehensive comparison between different types of steel beam-to-column connections since the effects of span-to-depth ratio and beam sections were filtered out.

Elasto-Plastic Beam Afloat on Water Subjected to Waves

2018 ◽  
Author(s):  
Kazuhiro Iijima ◽  
Akira Tatsumi ◽  
Masahiko Fujikubo
Keyword(s):  
Mathematical Model ◽  
Progressive Collapse ◽  
Bending Moment ◽  
Floating Structure ◽  
Beam Elements ◽  
Rankine Source ◽  
Elastoplastic Beam ◽  
The One ◽  
Collapse Behavior ◽  
Wave Induced

This paper addresses development of a mathematical model which describes the behavior of an elasto-plastic beam afloat on water surface. The mathematical model is valid for predicting the collapse of a Very Large Floating Structure (VLFS) subjected to extreme wave-induced vertical bending moment. It is a follow-up of the previous work in which the collapse behavior of a VLFS is pursued by adopting a segmented beam approach. In this research, the whole VLFS is modelled with elasto-plastic beam elements. The hydrodynamic behavior is modeled by using Rankine source panel method based on time-domain potential theory. It is shown that the elasto-plastic beam approach gives almost the same result as the segmented beam approach for predicting the one-element collapse behavior. The elastoplastic beam approach is extensively used to predict the progressive collapse spread over multiple sections, which cannot be followed by the segmented beam approach.

scholarly journals Study on Collapse Resistance of RC Frame under the Corner Column Removal Scenario

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7157
Author(s):  
Jin Xu ◽  
Sheliang Wang ◽  
Kangning Liu ◽  
Xiaoyi Quan ◽  
Fangfei Dong
Keyword(s):  
Progressive Collapse ◽  
Test Results ◽  
Reinforced Concrete Frame ◽  
Great Resistance ◽  
Concrete Frame ◽  
Floor Slabs ◽  
Collapse Resistance ◽  
Property Loss ◽  
Collapse Behavior ◽  
Column Removal Scenario

The progressive collapse of buildings induces a variety of catastrophic consequences, such as casualties and property loss over the past few decades. The corner column is more prone to abnormal load events compared to the inner column and outer column; thus, it is easier to trigger progressive collapse. By considering the effects of floor slabs and adjacent bays on progressive collapse behavior, the pseudo-static loading method was used to study the progressive collapse test of a 1/3 scaled, one story, 2 × 2-bay cast-in-place reinforced concrete frame substructure under the removal condition of a corner column. The test results show that the flexural deformation principally concentrates upon the components of a directly affected part (DAP), and compressive arch actions are observed in members of the indirectly affected part (IAP). Moreover, the slab adjacent to the removed column and periphery elements contributes great resistance to a progressive collapse.

scholarly journals PROGRESSIVE COLLAPSE RESISTANCE OF STEEL FRAMED BUILDINGS UNDER EXTREME EVENTS

2021 ◽  
Keyword(s):  
Failure Time ◽  
Progressive Collapse ◽  
Column Buckling ◽  
Collapse Resistance ◽  
Collapse Mode ◽  
Extreme Load ◽  
Theoretical Investigations ◽  
Dynamic Amplification ◽  
Collapse Behavior ◽  
In Fire

This paper presents experimental and theoretical investigations on progressive collapse behavior of steel framed structures subjected to an extreme load such as fire, blast and impact. A new capacity-based index is proposed to quantify robustness of structures. An energy-based theoretical model is also proposed to quantify the effect of concrete slabs on collapse resistance of structures. The experimental results show that the dynamic amplification factors of frames subject to impact or blast are much less than the conventional value of 2.0. The collapse process of frames in fire can be either static or dynamic depending on the restraint conditions and load levels. It is necessary to account for the failure time and residual strength of blast-exposed columns for assessing the collapse resistance of structures subject to explosion. Two collapse modes of steel frames under blast or impact are found: connection-induced collapse mode and column-induced collapse mode. In case of fire, a frame may collapse due to either column buckling or pulling-in effect of beams. The energy dissipation from elongation of slab reinforcement and additional resultant moment greatly contribute to the collapse resistance of structures.

scholarly journals Behavior Characteristics of Single Batter Pile under Vertical Load

2021 ◽  
Vol 11 (10) ◽  
pp. 4432
Author(s):  
Jiseong Kim ◽  
Seong-Kyu Yun ◽  
Minsu Kang ◽  
Gichun Kang
Keyword(s):  
Bearing Capacity ◽  
Relative Density ◽  
Model Test ◽  
Ground Surface ◽  
Bending Moment ◽  
Vertical Position ◽  
Vertical Load ◽  
Behavior Characteristics

The purpose of this study is to grasp the behavior characteristics of a single batter pile under vertical load by performing a model test. The changes in the resistance of the pile, the bending moment, etc. by the slope of the pile and the relative density of the ground were analyzed. According to the results of the test, when the relative density of the ground was medium and high, the bearing capacity kept increasing when the angle of the pile moved from a vertical position to 20°, and then decreased gradually after 20°. The bending moment of the pile increased as the relative density of the ground and the batter angle of the pile increased. The position of the maximum bending moment came closer to the ground surface as the batter angle of the pile further increased, and it occurred at a point of 5.2~6.7 times the diameter of the pile from the ground surface.

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 Computational Study of the Propeller Position Effects in Wing-Mounted, Distributed Electric Propulsion with Boundary Layer Ingestion in a 25 kg Remotely Piloted Aircraft

Drones ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 56
Author(s):  
José Serrano Cruz ◽  
Andrés Tiseira ◽  
Luis García-Cuevas ◽  
Pau Varela
Keyword(s):  
Boundary Layer ◽  
Electric Propulsion ◽  
Computational Study ◽  
Bending Moment ◽  
Vertical Position ◽  
Position Effects ◽  
Foreign Object Damage ◽  
Trade Offs ◽  
Remotely Piloted Aircraft ◽  
Interesting Approach

Distributed electric propulsion and boundary layer ingestion are two attractive technologies to reduce the power consumption of fixed wing aircraft. Through careful distribution of the propulsive system elements, higher aerodynamic and propulsive efficiency can be achieved, as well as a lower risk of total loss of aircraft due to foreign object damage. When used on the wing, further reductions of the bending moment on the wing root can even lead to reductions of its structural weight, thus mitigating the expected increase of operating empty weight due to the extra components needed. While coupling these technologies in fixed-wing aircraft is being actively studied in the big aircraft segment, it is also an interesting approach for increasing the efficiency even for aircraft with maximum take-off masses as low as 25 kg, such as the A3 open subcategory for civil drones from EASA. This paper studies the effect of changing the propellers’ position in the aerodynamic performance parameters of a distributed electric propulsion with boundary layer ingestion system in a 25 kg fixed-wing aircraft, as well as in the performance of the propellers. The computational results show the trade-offs between the aerodynamic efficiency and the propeller efficiency when the vertical position is varied.

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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