Fire performance of moment-resisting concealed timber connections reinforced with self-tapping screws

2020 ◽  
Author(s):  
Oluwamuyiwa Okunrounmu ◽  
Osama (Sam) Salem ◽  
George Hadjisophocleous
Keyword(s):  
Fire Performance ◽  
Moment Resisting ◽  
Timber Connections

scholarly journals STUDY OF THE FIRE PERFORMANCE OF HYBRID STEEL-TIMBER CONNECTIONS WITH FULL-SCALE TESTS AND FINITE ELEMENT MODELLING

2016 ◽  
Author(s):  
Aaron O. Akotuah ◽  
Sabah G. Ali ◽  
Jeffrey Erochko ◽  
Xia Zhang ◽  
George V. Hadjisophocleous
Keyword(s):  
Finite Element ◽  
Load Ratio ◽  
Full Scale ◽  
Test Results ◽  
Structural Members ◽  
Fire Performance ◽  
Shear Connection ◽  
Timber Connections ◽  
Full Scale Tests ◽  
Connection Design

Connection design is critical in timber buildings since the connections tend to have lower strength than the structural members themselves and they tend to fail in a brittle manner. The effect of connection geometry on the fire performance of a hybrid steel-timber shear connection is investigated by full-scale testing. These tests were conducted by exposing the test specimens to the standard time-temperature curve defined by CAN/ULC-S101 (CAN/ULC-S101, 2007). Test results showed that the fire resistance of these connections depends on the load ratio, the type of connection and the relative exposure of the steel plate to fire. Finite element models of the connections under fire were constructed using ABAQUS/CAE and these were validated using the test results. These numerical model results correlate well with test results with ±8.32% variation.

Impact of Bolt Pattern on the Fire Performance of Protected and Unprotected Concealed Timber Connections

2020 ◽  
pp. 303-310
Author(s):  
Aba Owusu ◽  
Osama (Sam) Salem ◽  
George Hadjisophocleous
Keyword(s):  
Fire Performance ◽  
Timber Connections

scholarly journals On the Fire Performance of Double-shear Timber Connections

2011 ◽  
Vol 10 ◽  
pp. 1207-1218 ◽  
Author(s):  
L. Peng ◽  
G. Hadjisophocleous ◽  
J. Mehaffey ◽  
M. Mohammad
Keyword(s):  
Fire Performance ◽  
Double Shear ◽  
Timber Connections

Structural Fire Performance of Innovative Moment-Resisting Connection Joining Steel Beams to HSS Columns

2014 ◽  
Vol 5 (4) ◽  
pp. 331-352
Author(s):  
Osama Salem ◽  
George Hadjisophocleous ◽  
Ehab Zalok
Keyword(s):  
Large Scale ◽  
Plate Thickness ◽  
Steel Beams ◽  
Fire Performance ◽  
Structural Fire ◽  
End Plate ◽  
Moment Connection ◽  
Moment Resisting ◽  
Regular Configuration ◽  
Extended End Plate

In this paper, experimental results of the structural fire behaviour of four large-scale steel frame test assemblies are presented. Test assemblies were made of HSS beams and columns connected together using an innovative extended end-plate moment connection configuration. Two different parameters were investigated, the connection end plate thickness and the degree of beam axial restraint. The fire performance of this beam-to-column configuration was compared to the behaviour of a commonly-used connection configuration with similar parameters and fire testing conditions. The newly-developed connection configuration behaved in a more flexible manner at elevated temperature than the regular configuration. In addition to improved constructability and pleasant appearance, the new connection configuration exhibits greater moment-carrying capacity and enhanced fire resistance characteristics.

Lateral Resisting Experiment of Prestressed-Tube Bolted Connection for Post-and-Beam Timber Construction

2013 ◽  
Vol 778 ◽  
pp. 631-638 ◽  
Author(s):  
Min Juan He ◽  
Yi Zhao ◽  
Ren Le Ma
Keyword(s):  
Damping Ratio ◽  
Hysteresis Curve ◽  
Lateral Stiffness ◽  
Loading Test ◽  
Bolted Connection ◽  
Equivalent Viscous Damping ◽  
Timber Construction ◽  
Moment Resisting ◽  
Good Potential ◽  
Timber Connections

Connections are key elements and the weak points for timber structures. The most commonly used bolted timber connections with slotted in steel plate have low lateral stiffness and poor ductility in post-and-beam construction. This paper introduces the prestressed-tube bolted connection to alleviate this problem. To evaluate its lateral resisting performance, the failure mode, strength, lateral stiffness, ductility, hysteresis curve and equivalent viscous damping ratio of the ordinary and improved connections, as determined by the monotonic and reversed cyclic loading test, are compared. The results demonstrate that the lateral stiffness of the prestressed-tube bolted connection has been significantly improved, and its ductility is also better than the normal bolted connection with no decrease in the ultimate moment resisting capacity. It is believed that the semi-rigid prestressed-tube bolted connection, as an alternative to current bolted solutions, may provide reasonable lateral stiffness and has good potential for use in post-beam timber construction.

Seismic behaviour of fibre-reinforced-polymer- and steel-strengthened timber connections

2018 ◽  
Vol 22 (2) ◽  
pp. 502-518 ◽  
Author(s):  
Jia-Qi Yang ◽  
Scott T Smith ◽  
Zhenyu Wang
Keyword(s):  
Cyclic Loading ◽  
Structural Integrity ◽  
Bending Moment ◽  
Steel Plates ◽  
Seismic Behaviour ◽  
Damping Characteristics ◽  
Reinforced Polymer ◽  
Moment Resisting ◽  
Fibre Reinforced Polymer ◽  
Timber Connections

In the event of a seismic attack, the structural integrity of moment-resisting timber frames in the joint region may become compromised and hence the joint may not be able to transfer bending moment around the frame. Often, replacement of a damaged joint is not an option and hence efficient but effective strengthening and repair schemes for such joints are necessary. This article reports the results of 15 tests on 10 metal dowel-type moment-resisting timber connections subjected to monotonic or cyclic loading. Joints are either strengthened or repaired with epoxy, fibre-reinforced polymer composites or steel plates. The ability of the test joints to resist the imposed cyclic loading is presented in the context of hysteresis responses. Recommendations for strengthening and repair interventions are made based on strength, stiffness, ductility, energy dissipation and damping characteristics of the test joints.

Sign in / Sign up

Export Citation Format

Share Document