Fire design of external semi-rigid composite joints

Schaumann, Peter; Bahr, Oliver

doi:10.1201/b10564-99

Cited by 5 publications

(6 citation statements)

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“…However, this investigation allows for drawing some important conclusions, which are important for the fire design of members [17,18].…”

Section: Discussionmentioning

confidence: 99%

A Study on the Conservativeness of ISO Standard Fire in Office Buildings

Bahr¹

2014

Journal of Structural Fire Engineering

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In fire safety engineering, the ISO standard fire often represents fire action. Nevertheless, it is often not clear how conservative the ISO standard fire is when compared to natural fires. Thus, numerical research on fires in office buildings was conducted. To assess the severity of the ISO standard fire, the author proposes a simple approach basing on the heat release rate. For two regarded office rooms, artificial heat release curves were established and used as input in the zone model 'Ozone'. These heat release curves were adjusted in order to match gas temperatures defined by the ISO standard fire. Integration of these curves allows for determining the total energy released by the fire. If this energy is related to the compartment area, it becomes possible to compare the ISO standard fire to natural fires. Results from the limited investigations show that the ISO standard fire becomes more conservative for longer fire duration and that it is quite realistic for offices with moderate opening factors and fire durations of 60 min at most. Contrary, the ISO standard fire tends to be very conservative for offices with higher opening factors.

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“…However, this investigation allows for drawing some important conclusions, which are important for the fire design of members [17,18].…”

Section: Discussionmentioning

confidence: 99%

A Study on the Conservativeness of ISO Standard Fire in Office Buildings

Bahr¹

2014

Journal of Structural Fire Engineering

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“…Figure 10(a) shows the corresponding test setup. Results of the validation against the three other isolated joint tests “H2” to “H4” is given in (Bahr, 2011; Schaumann et al , 2010).…”

Section: Validation Of the Established Numerical Modelmentioning

confidence: 99%

“…Figure 10(a) shows the corresponding test setup. Results of the validation against the three other isolated joint tests "H2" to "H4" is given in (Bahr, 2011;Schaumann et al, 2010). Isolated joint test "H1" with circular concrete-filled double skin tube column Validation of the thermal model In the numerical model, the determination of the load-response of fire-exposed members depends on their temperature field.…”

Section: Validation Of the Established Numerical Model Introductionmentioning

confidence: 99%

On the fire performance of unbraced composite frames

Bahr

2018

JSFE

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Purpose The purpose of this study is to gain a deeper understanding of the structural behaviour of fire-exposed unbraced composite frames. Designers to date paid little attention to unbraced one-bay composite frames as structural system. There are two main reasons for this. First, codes lack simplified methods for the fire design of these frames due to their sway and the linked P-Δ effects when subjected to fire, which complicates the design. Second, it is demanding to construct external composite joints for the regarded one-bay frames. Thus, external joints in composite constructions are mostly constructed as steel joints. Nevertheless, these frames offer advantages. These include increased usable space and flexibility in the building’s use, large spans, fast construction times and inherent fire resistance. Design/methodology/approach To profit from these benefits, two different external semi-rigid composite joint were developed for the considered one-bay composite frames. The first solution based on concrete-filled steel tube columns and the second on concrete-filled double skin tube columns. Furthermore, a numerical model was established to study the fire performance of unbraced composite frames. The model was validated against four fire tests on isolated composite joints and two large-scale fire tests on unbraced composite frames. Findings Overall, the predictions of the numerical model were in good agreement with the test results. Thus, the numerical model is appropriate for further investigations on the fire performance of unbraced composite frames. Originality/value The sequence of construction results in significant stresses in the steel section, which creates difficulties in numerical modelling and may account for the relatively few studies carried out at room temperature. For the fire design, there was, to the best knowledge of the author, to date no numerical model available that was capable of considering the sequence of construction.

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“…[8], the studies presented above indicate that it is difficult to connect a composite beam to a circular CFT in an economical way. Moreover, it also appears cumbersome to ensure a ductile failure mode of these joints with an adequate rotational capacity.…”

Section: Introductionmentioning

confidence: 96%