Proceedings of the 11th International Conference on Structures in Fire (SiF2020)最新文献

A numerical investigation of 3D structural behavior for steel-composite structures under various travelling fire scenarios 不同移动火灾情景下钢-组合结构三维性能的数值研究

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/a1068ab

Zhuojun Nan, Xu Dai, Haimin Chen, S. Welch, A. Usmani

引用次数: 8

Lifetime economically optimum position of steel reinforcement in a concrete column exposed to natural fire 自然火灾下混凝土柱中钢筋的寿命经济最佳位置

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/985c79e

S. Ni, R. V. Coile, N. Khorasani, D. Hopkin, T. Gernay

{"title":"Lifetime economically optimum position of steel reinforcement in a concrete column exposed to natural fire","authors":"S. Ni, R. V. Coile, N. Khorasani, D. Hopkin, T. Gernay","doi":"10.14264/985c79e","DOIUrl":"https://doi.org/10.14264/985c79e","url":null,"abstract":"This paper incorporates a probabilistic fire loss assessment method for reinforced concrete structures into a cost-benefit analysis to optimize a structural fire design. Economic losses in case of failure and survival of the structure are both quantified with, in the latter case, an estimate of the damage and repairs costs. As a case study, a cost-benefit optimization of the position of rebars in a concrete column is investigated. The column response in fire is evaluated using finite element simulations in SAFIR. Variations in cover thickness result in variations in failure probabilities and, for cases where no failure occurs, variations in repair costs due to heat penetration and residual out-of-plane deformation of the column. The optimum cover thickness is the one that offers the best trade-off between the various repair costs across the range of likely fire intensity levels. This optimum is sensitive to repair decisions such as the tolerance on the acceptable residual out-of-plane deformation after a fire. For the studied cases, the optimum cover thickness is smaller in slender columns than in stocky columns due to greater out-of-plane deformations in the former.","PeriodicalId":111478,"journal":{"name":"Proceedings of the 11th International Conference on Structures in Fire (SiF2020)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131702932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Deformation behaviour and failure time of glued laminated timber columns in fire 胶合层合木柱在火灾中的变形行为及破坏时间

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/beec17b

T. Hirashima, H. Yamashita, Shungo Ishi, T. Igarashi, S. Baba, T. Someya

引用次数: 2

Experimental study on fire resistance of a full-scale composite floor assembly in a two-story steel framed building 两层钢框架建筑全尺寸复合楼板构件耐火性能试验研究

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/e6af102

L. Choe, Selvarajah Ramesh, X. Dai, Matthew S. Hoehler, M. Bundy

{"title":"Experimental study on fire resistance of a full-scale composite floor assembly in a two-story steel framed building","authors":"L. Choe, Selvarajah Ramesh, X. Dai, Matthew S. Hoehler, M. Bundy","doi":"10.14264/e6af102","DOIUrl":"https://doi.org/10.14264/e6af102","url":null,"abstract":"PurposeThe purpose of this paper is to report the first of four planned fire experiments on the 9.1 × 6.1 m steel composite floor assembly as part of the two-story steel framed building constructed at the National Fire Research Laboratory.Design/methodology/approachThe fire experiment was aimed to quantify the fire resistance and behavior of full-scale steel–concrete composite floor systems commonly built in the USA. The test floor assembly, designed and constructed for the 2-h fire resistance rating, was tested to failure under a natural gas fueled compartment fire and simultaneously applied mechanical loads.FindingsAlthough the protected steel beams and girders achieved matching or superior performance compared to the prescribed limits of temperatures and displacements used in standard fire testing, the composite slab developed a central breach approximately at a half of the specified rating period. A minimum area of the shrinkage reinforcement (60 mm2/m) currently permitted in the US construction practice may be insufficient to maintain structural integrity of a full-scale composite floor system under the 2-h standard fire exposure.Originality/valueThis work was the first-of-kind fire experiment conducted in the USA to study the full system-level structural performance of a composite floor system subjected to compartment fire using natural gas as fuel to mimic a standard fire environment.","PeriodicalId":111478,"journal":{"name":"Proceedings of the 11th International Conference on Structures in Fire (SiF2020)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126859735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The collapse of World Trade Center 7: revisited 世界贸易中心7号的倒塌:重访

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/9f81895

M. A. Orabi, Liming Jiang, A. Usmani, J. Torero

引用次数: 4

Generalized fragility curves for concrete columns exposed to fire through surrogate modelling 用代理模型计算火灾下混凝土柱的广义易损性曲线

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/45b645e

R. Chaudhary, Balša Jovanovi?, T. Gernay, R. V. Coile

{"title":"Generalized fragility curves for concrete columns exposed to fire through surrogate modelling","authors":"R. Chaudhary, Balša Jovanovi?, T. Gernay, R. V. Coile","doi":"10.14264/45b645e","DOIUrl":"https://doi.org/10.14264/45b645e","url":null,"abstract":", ABSTRACT Common structural fire design relies on recommendations from design codes, or (a single or small set of) more advanced numerical analyses. When applying such procedures to the design of structures under normal loading conditions, adequate safety is ensured through calibrated safety factors and ample experience with structural failures. This is however not the case when considering accidental fire loading, where the stochasticity in the structural fire behaviour is rarely fully acknowledged. Therefore, a significant interest in the use of probabilistic approaches to evaluate structural fire performance, which take into account the uncertainty associated with model parameters, can be observed among researchers, with a special focus on the development of fragility curves. The calculation of fragility curves is, however, a laborious task, demanding huge computational expense, mainly attributed to the adoption of advanced calculation procedures and the need for a large number of model evaluations. The present study contributes to addressing the limitations imposed by these computational requirements through the development of surrogate models for fire exposed structural members. To achieve this, a framework for carrying out probabilistic studies of structures under fire through the use of surrogate modelling is presented. The framework is applied to a concrete column subjected to a standard fire and proves efficiency and accurateness for the selected simple example. Future studies will investigate the applicability of the framework to structural assemblies under physically-based fires.","PeriodicalId":111478,"journal":{"name":"Proceedings of the 11th International Conference on Structures in Fire (SiF2020)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129953741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fire resistance of stainless steel slender elliptical hollow section beam-columns 不锈钢细长椭圆空心截面梁柱的耐火性能

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/d2ff46e

Flávio Alexandre Matias Arrais, N. Lopes, P. Vila Real

{"title":"Fire resistance of stainless steel slender elliptical hollow section beam-columns","authors":"Flávio Alexandre Matias Arrais, N. Lopes, P. Vila Real","doi":"10.14264/d2ff46e","DOIUrl":"https://doi.org/10.14264/d2ff46e","url":null,"abstract":"PurposeStainless steel has different advantages when compared to conventional carbon steel. The corrosion resistance and aesthetic appearance are the most known; however, its better behaviour under elevated temperatures can also be important in buildings design. In spite of the initial cost, stainless-steel application as a structural material has been increasing. Elliptical hollow sections integrate the architectural attributes of the circular hollow sections and the structural advantages of the rectangular hollow sections (RHSs). Hence, the application of stainless-steel material combined with elliptical hollow profiles stands as an interesting design option. The purpose of the paper is to better understand the resistance of stainless-steel-beam columns in case of fireDesign/methodology/approachThe research presents a numerical study on the behaviour of stainless-steel members with slender elliptical hollow section (EHS) subjected to axial compression and bending about the strong axis at elevated temperatures. A parametric numerical study is presented here considering with and without out-of-plane buckling different stainless-steel grades, cross-section and member slenderness, bending moment diagrams and elevated temperatures.FindingsThe tested design methodologies proved to be inadequate for the EHS members being in some situations too conservative.Originality/valueThe safety and accuracy of Eurocode 3 (EC3) design methodology and of a recent design proposal developed for I-sections and cold-formed RHSs are analysed applying material and geometric non-linear analysis considering imperfections with the finite element software SAFIR.","PeriodicalId":111478,"journal":{"name":"Proceedings of the 11th International Conference on Structures in Fire (SiF2020)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121051965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic models for thermal properties of concrete 混凝土热性能的概率模型

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/363ff91

Balša Jovanovi?, N. Khorasani, Thomas Thienpont, R. Chaudhary, R. V. Coile

{"title":"Probabilistic models for thermal properties of concrete","authors":"Balša Jovanovi?, N. Khorasani, Thomas Thienpont, R. Chaudhary, R. V. Coile","doi":"10.14264/363ff91","DOIUrl":"https://doi.org/10.14264/363ff91","url":null,"abstract":"Thermal conductivity and specific heat of concrete are highly influential parameters for the heat transfer into the material during fire exposure. Reviewing the available literature has shown that there is a large scatter in the data for these thermal parameters. To quantify that uncertainty, novel probabilistic models for thermal conductivity and specific heat of concrete at elevated temperatures are developed. Analysis of available experimental data indicates that a temperature-dependent Gamma distribution can be recommended for both thermal properties. Closed-form equations for the temperature-dependent mean and standard deviation are derived. Thus, for both the thermal conductivity and the specific heat, a continuous probability distribution as a function of temperature is obtained, which can be easily implemented in numerical simulations. Using the example of the probabilistic analysis of a simply supported concrete slab exposed to the standard fire, the models are compared with the commonly used deterministic representation of the thermal properties. It is shown that the calculated probabilities of failure using the deterministic models are an order of magnitude lower and therefore unconservative. This analysis suggests that accounting for the uncertainty in thermal properties for concrete slabs can have a significant effect on evaluating the safety and therefore should not be ignored in cases of high importance.","PeriodicalId":111478,"journal":{"name":"Proceedings of the 11th International Conference on Structures in Fire (SiF2020)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133616970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Travelling fire in full scale experimental building subjected to open ventilation conditions 全尺寸实验建筑开放式通风条件下的火灾

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/987a305

A. Nadjai, Naveed Alam, M. Charlier, O. Vassart, Xu Dai, J. Franssen, John W. Sjostrom

引用次数: 5

Critical fibre dimesions for preventing spalling of ultra-high performance concrete at high temperature 防止高温下超高性能混凝土剥落的关键纤维尺寸

Proceedings of the 11th International Conference on Structures in Fire (SiF2020) Pub Date : 2020-11-30 DOI: 10.14264/39c2ce2

Dong Zhang, K. Tan

引用次数: 1