Experimental Study on Strength of Connections to Concrete Filled Tubular in Fire

2011 ◽  
Vol 299-300 ◽  
pp. 743-746
Author(s):  
Hong Jun Sun ◽  
Li Hong Zhao
Keyword(s):  
Experimental Study ◽  
Fire Protection ◽  
Failure Modes ◽  
Steel Beams ◽  
Steel Beam ◽  
Catenary Action ◽  
Tubular Columns ◽  
In Fire ◽  
Sufficient Strength ◽  
Very High

Concrete filled tubular columns are widely used all over the world, due to their significant advantages, including attractive appearance, structural efficiency, reduced column footing, fast construction and high fire resistance without external fire protection. An experimental study has been carried out on the performance of joints between steel beams and concrete filled tubular columns in simple construction under fire conditions. The failure modes of the test specimens were always in the joint regions. Therefore, if the joints are appropriately designed and protected so that they possess sufficient strength, it is possible for the steel beam to develop catenary action and survive very high temperatures even without fire protection.

scholarly journals MECHANICAL BEHAVIOR AND CATENARY ACTION OF RESTRAINED STEEL BEAM UNDER FIRE

2021 ◽  
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Failure Modes ◽  
Tensile Tests ◽  
Steel Beams ◽  
Steel Beam ◽  
Catenary Action ◽  
Standard Fire ◽  
Loading Ratio ◽  
Fire Experiments

To investigate the mechanical behavior and catenary action of restrained steel beam under fire, experiments were performed on five H-section restrained steel beams exposed to ISO-834 standard fire. At first, mechanical property tensile tests were performed on 3 room-temperature specimens and 8 high-temperature specimens, and variation laws of the material properties of steel materials with temperature rising were investigated by the high-temperature steady-state tests. Through the fire experiments, the temperature data, mid-span deflections and failure modes of all specimens were obtained. The experimental results show that: (1) a restrained steel beam is prone to in-plane buckling failure under fire; (2) the loading ratio n and axial restraint stiffness Kx have great influences on the catenary action of restrained steel beam under fire; (3) when the loading ratio n is constant, the greater the axial restraint stiffness Kx, the later the catenary action occurs; when the axial restraint stiffness Kx is constant, the greater the loading ratio n, the earlier the catenary action occurs.

Interactive shear resistance of corrugated web in steel beam exposed to fire

2016 ◽  
Vol 7 (1) ◽  
pp. 69-78
Author(s):  
Mariusz Marcin Maslak ◽  
Marcin Lukacz
Keyword(s):  
Failure Modes ◽  
Steel Beams ◽  
Steel Beam ◽  
Safety Level ◽  
Design Algorithm ◽  
Content Type ◽  
Corrugated Webs ◽  
Buckling Resistance ◽  
Corrugated Web ◽  
Shear Buckling

Purpose The purpose of this paper is to present and discuss in detail the design approach to shear buckling resistance evaluation for corrugated web being a part of a steel beam exposed to fire. Design/methodology/approach It is based on the interaction between the local and global elastic instability failure modes as well as on the possible yielding of the whole web cross-section during fire. Findings New formulae, adequate for specification of the suitable shear buckling coefficients, depend not only on the web slenderness but also on the temperature of structural steel. Originality/value The methodology proposed by the authors can be added to the current European standard recommendations given in EN 1993-1-2 as a well-justified design algorithm helpful in reliable evaluation of a safety level for steel beams with slender corrugated webs subject to fire exposure. It seems to be highly desirable because, at present, there are no detailed instructions in this field.

scholarly journals Experimental study of CFST column to steel beam bolted connection with curved end-plates

2019 ◽  
Author(s):  
Andrej Mudrov ◽  
Antanas Šapalas ◽  
Gintas Šaučiuvėnas
Keyword(s):  
Experimental Study ◽  
Failure Modes ◽  
Bending Strength ◽  
Centrifugal Casting ◽  
Casting Process ◽  
Steel Tube ◽  
Steel Beam ◽  
Initial Contact ◽  
Hollow Core ◽  
Concrete Core

This paper presents results of experimental study of a bolted column-beam connection with an extended curved end-plate joining steel beam and a hollow core Concrete-Filled Steel Tube (CFST). Column concrete hollow core was formed by centrifugal casting process that allowed decreasing porosity, increasing homogeneity and strength of the concrete. It was expected that strength and stiffness of the joint would be significantly affected by spalling of the concrete core due to transverse action, which would limit rotation of the joint and bearing capacity of the column. However, the concrete hollow core had no prominent signs of fracture – bending strength of the joint was determined by punching shear of the steel tube wall. Further result analysis has shown that, in reference to Eurocode 3, the joint may be classified as semi-rigid and that non-uniform initial contact between the end-plates and the column can reduce stiffness of the joint. In addition to this, it has been found that the analytical Eurocode component method is in close agreement with the attained test results, but its feasibility should be validated against additional tests with other failure modes.

Considering Catenary Action in Designing End-Restrained Steel Beams in Fire

2005 ◽  
Vol 8 (3) ◽  
pp. 309-324 ◽  
Author(s):  
H. X. Yu ◽  
J. Y. Richard Liew
Keyword(s):  
Design Method ◽  
Load Capacity ◽  
Limit State ◽  
Beam Deflection ◽  
Steel Beams ◽  
Ultimate Limit State ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Catenary Action ◽  
In Fire

When a building compartment is subjected to fire attack, there are complex interactions between the fire affected members with the surrounding members. The behaviour of the steel frame members in fire can be drastically different from that of its member in isolation. This paper studies the behaviour of steel beams with the increase of temperature from beam action phase to catenary action phase and until failure. The load bearing mechanism in the catenary action phase is discussed and the failure criterion is defined. A new ultimate limit state based on 15% maximum strain of steel material at elevated temperature is proposed to determine the ultimate load capacity of beams failed in the catenary action phase. Wide ranges of beam parameters including various beam sizes and span lengths with different degrees of end restraints are studied. Comparison of results with those obtained from nonlinear finite element analysis shows that the proposed design method could enhance the critical temperature of steel beams by over 200 °C if proper attention is given to the integrity of connections to resist the catenary force. In this respect, methods to estimate the catenary force and beam deflection are provided.

Seismic Capacity of Threaded, Brazed and Grooved Fire Protection Pipe Joints

2012 ◽  
Author(s):  
Brent Gutierrez ◽  
George Antaki
Keyword(s):  
Fire Protection ◽  
Failure Modes ◽  
Shake Table ◽  
Dynamic Failure ◽  
Lateral Loads ◽  
Seismic Capacity ◽  
Shake Table Tests ◽  
Protection Systems ◽  
Pipe Joints ◽  
In Fire

A series of static and shake table tests were conducted on pressurized threaded, brazed and mechanical, i.e., grooved pipe joints, commonly used in fire protection systems. The objective of the tests was to understand the behavior and failure modes of these common types of joints under seismic and static lateral loads. The paper presents the measured loads and deflections of the joints up to the point of failure. It also describes the joints’ static and dynamic failure modes. While this information may be limited it can be used to model the joint flexibility under large lateral loads, determine their capacity, and help understand the leak and rupture characteristics of threaded, brazed and clamped joints.

scholarly journals Experimental Study on Bolt-Spliced Prefabricated Steel Frame Beams

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Ran He ◽  
Zaihua Zhang ◽  
Jingchao Li
Keyword(s):  
Experimental Study ◽  
Industrial Development ◽  
Failure Modes ◽  
Rotation Angle ◽  
Steel Frame ◽  
Steel Beam ◽  
Test Results ◽  
Load Bearing Capacity ◽  
Loading Patterns ◽  
Practical Engineering

The prefabricated steel structural residence is characterized by modularization and standardization, which meets the requirement of industrial development. The steel frame beam needs to be fabricated in segments and assembled in site due to the limitation of transportation. In practical engineering, the steel frame beams need to be spliced along the beam span. A robust connection between the two steel beam segments is necessary as it will influence the load bearing capacity, stiffness, and stability of the steel frame. In total, 12 specimens were tested to investigate the influence of spliced types, loading patterns, and bolt types on the performance of the steel frame. The observed failure modes, load versus displacement curves, and moment versus rotation angle curves are presented. The test results show that the strength and deformability of bolt-spliced connections are generally good and similar to those of the prototype beam.

Research on the Judgement Method for Catenary Action of Restrained Steel Beams in Fire

2020 ◽  
Vol 20 (2) ◽  
pp. 692-704
Author(s):  
Meijing Liu ◽  
Shenggang Fan ◽  
Yang Guo ◽  
Heyang Gui ◽  
Runmin Ding ◽  
...  
Keyword(s):  
Steel Beams ◽  
Catenary Action ◽  
In Fire
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