Purpose
The purpose of this paper is to investigate different types of fire on structural steel members with damaged fireproofing. Two types of fire scenarios are considered, ASTM E119 fire and Hydrocarbon fire. In industrial facilities such as oil refineries, certain units maybe subjected to hydrocarbon fire, and its effect might be different than standard fire. The purpose of this study is to compare both types of fire scenarios on steel beams with damaged fireproofing and determine the fire rating of the damaged beams under each fire scenario.
Design/methodology/approach
The study is performed using computational methods, thermal-stress finite element analysis that is validated with experimental results. The results of practical beam sizes and typical applied loads in such structures have been plotted and compared with steel beams with non-damaged fireproofing.
Findings
The results show significant difference in the beam fire resistance between the two fire scenarios and show the fire resistance for beam under each case. The study provides percentage reduction in fire resistance under each case for the most commonly used cases in practice under different load conditions.
Originality/value
Extensive literature search has been performed by the authors, and few studies were found relevant to the topic. The question this study answers comes up regularly in practice. There are no standards to codes that address this issue.
The dynamic response of machine foundation system depends on several factors such as (1) the soil dynamic properties, (2) the geometric properties of the foundation, (3) the amplitude of the applied dynamic loads, and (4) the frequency of the exciting dynamic force. The main goal of machine foundation design is to keep the foundation response within a specific limit of response in order to enable a satisfactory operation of the machine. If the foundation response exceeds this limit, the foundation will adversely affect the performance of the machine and may damage the machine internals, or cause it not to function properly. Furthermore, the excessive vibrations will impose additional stresses on the machine resulting in an increased unbalance loading and thus leading to increased dynamic loads on the soil-foundation system. This paper presents the results of the dynamic analysis of a four-cylinder compressor foundation. The original design of the foundation was performed in the early 1960s and ignored the effect of the soil in the response of the foundation system, thus, the foundation has been suffering from excessive vibration. The foundation block supports a four-cylinder dress-rand compressor, suction and discharge bottles, a crank and driving motor with a total weight of approximately 219 kips. The results of a threedimensional finite element model of the soil-foundation system were used to determine the dynamic response of the soil-foundation system and to assess the foundation response under the applied dynamic loading imposed by the compressor crank. The dynamic analysis is performed by: (1) performing eigenvalue analysis of the foundation block, considering the effect of the soilfoundation interaction to determine the soil-foundation natural frequencies and modal participation factors, and (2) performing forced response of the foundation under applied crankshaft unbalance load to determine the forced response amplitude of the soil-foundation system.
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