Post-fire mechanical properties of high strength Q690 structural steel

Li, Guoqiang; Lyu, Huibao; Zhang, Chao

doi:10.1016/j.jcsr.2016.12.027

Cited by 128 publications

(46 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The retention factors of the Young's modulus (ET/E) for H6 and V4 series are tabulated in Tables 2 and 3, respectively. The ET/E values are plotted and compared with the predictive equations proposed by Gunalan and Mahendran [10] for cold-formed high strength steel grades G500 and G550, Qiang et al [11] for hot-rolled S690 steel sheet, Qiang et al [12] for hot-rolled S960 steel sheet as well as Li et al [13] for hot-rolled Q690 steel plate, as shown in Fig. 5.…”

Section: Young's Modulusmentioning

confidence: 99%

“…It can be observed that the cold-formed high strength steels regained more than 96 % of their Young's modulus up to 800 °C, above which the deterioration became relatively more noticeable. Even after exposure to an elevated temperature of 1000 °C, the cold-formed high strength steel Qiang et al [12] Li et al [13] Li, H.T. and Young, B.…”

Section: Young's Modulusmentioning

confidence: 99%

“…It is shown that the predictive equations in Gunalan and Mahendran [10] and Qiang et al [11,12] could be conservatively used for the cold-formed high strength steels. The retention factors proposed by Li et al [13] are taken as unity for temperatures up to 900 °C, which gives quite good predictions for the tested materials for temperatures up to 800 °C.…”

Section: Young's Modulusmentioning

confidence: 99%

“…The fy,T/fy values are plotted against temperatures and compared with the predictive equations proposed by Gunalan and Mahendran [10], Qiang et al [11,12] and Li et al [13] in Fig. 6.…”

Section: Yield Stressmentioning

confidence: 99%

“…Postfire mechanical properties including the Young's modulus, yield stress and ultimate strength were obtained. The derived post-fire retention factors were compared with existing proposals in Gunalan and Mahendran [10], Qiang et al [11,12] and Li et al [13] in order to evaluate their applicability to cold-formed high strength steels. Moreover, predictive equations are proposed to determine the residual mechanical properties of high strength steels after fire exposure.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Post-fire mechanical properties of high strength steels

Young

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

View full text Add to dashboard Cite

High strength steels are becoming increasingly attractive for structural and architectural applications due to their superior strength-to-weight ratio which could lead to lighter and elegant structures. The stiffness and strength of high strength steels may reduce after exposure to fire. The post-fire mechanical properties of high strength steels have a crucial role in evaluating the residual strengths of these materials. This paper presents an experimental investigation on post-fire mechanical properties of cold-formed high strength steels. A series of tensile coupon tests has been carried out. The coupon specimens were extracted from cold-formed square hollow sections with nominal yield stresses of 700 and 900 MPa at ambient temperature. The specimens were exposed to various elevated temperatures ranged from 200 to 1000 °C and then cooled down to ambient temperature before tested to failure. Stress-strain curves were obtained and the mechanical properties, namely, Young's modulus, yield stress (0.2% proof stress) and ultimate strength, of the cold-formed high strength steel materials after exposure to elevated temperatures were derived. The post-fire retention factors that obtained from the experimental investigation were compared with existing predictive equations in the literature. New predictive equations are proposed to determine the residual mechanical properties of high strength steels after exposure to fire. It is shown that the proposed predictive equations are suitable for both cold-formed and hot-rolled high strength steel materials with nominal yield stresses ranged from 690 to 960 MPa.

show abstract

Section: Young's Modulusmentioning

confidence: 99%

Section: Young's Modulusmentioning

confidence: 99%

Section: Young's Modulusmentioning

confidence: 99%

“…The fy,T/fy values are plotted against temperatures and compared with the predictive equations proposed by Gunalan and Mahendran [10], Qiang et al [11,12] and Li et al [13] in Fig. 6.…”

Section: Yield Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Post-fire mechanical properties of high strength steels

Young

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

View full text Add to dashboard Cite

show abstract

Post‐Fire Mechanical Properties of Steel S900MC

Abebe¹,

Shakil²,

Lü³

et al. 2021

ce papers

View full text Add to dashboard Cite

This paper discusses mechanical properties after one heating and cooling cycle using experimental tests. The material tested was steel S900MC, which has the nominal yield strength of 900 N/mm2. The specimens were tested with being first heated up inside a furnace to a pre‐defined temperature, then cooled down to the room temperature. I n order to study the effects of cooling rates on mechanical properties, two different cooling methods were used: cooling inside furnace, and cooling in the air. The results indicated a clearly reduction of the strength when the steel was cooled from the temperature above 500 °C. The steel reduced 40% of its yield strength after cooled from 700°C, while only 20% remained when cooled from 900°C. The elastic modulus was regained to its original value after the steel was cooled from temperatures below 500°C, whereas about 80% was regained when the steel was cooled from 900°C. Cooling temperatures between 700°C and 900°C produced a large scatter among all the mechanical properties. The cooling rate did not affect the mechanical properteis when the maximum temperature remains below 700 °C before the cooling starts. However, when exposed to an elevated temperature above 700°C the effect is visible. The air‐cooled specimens had higher strength and lower ductility than furnace cooled specimens. The results of this study will help to evaluate the load‐bearing capacity and reusability of the steel members after fire‐exposure.

show abstract

Influence of load and high temperature on the post‐fire behaviour of high‐strength structural steels

Lapuebla‐Ferri,

Pons,

Romero

et al. 2023

ce papers

View full text Add to dashboard Cite

In this work, an experimental campaign was carried out to evaluate the post‐fire mechanical performance of high‐strength steel specimens (grade S700) when being subjected simultaneously to different combinations of tensile load and elevated temperature. To this end, transient‐state tests were firstly carried out to obtain the ‘critical temperature’, i.e., the temperature at which a specimen failed while being simultaneously subjected to tensile load and heated at a constant temperature rate. Secondly, post‐fire tests were performed on unloaded as well as loaded specimens. For that purpose, specimens were heated to temperatures below the critical temperature, cooled down in air and finally submitted to tensile testing. In order to investigate the influence of production route, specimens were extracted from cold‐formed circular hollow sections and hot‐rolled sheets. Moreover, coupons with five different thicknesses were tested to investigate the influence of section thickness on the post‐fire behaviour. Residual values of yield strength, ultimate strength, elastic modulus and ductility were determined from the tests and discussed.

show abstract

Post-fire mechanical properties of high strength Q690 structural steel

Cited by 128 publications

References 7 publications

Post-fire mechanical properties of high strength steels

Post-fire mechanical properties of high strength steels

Post‐Fire Mechanical Properties of Steel S900MC

Influence of load and high temperature on the post‐fire behaviour of high‐strength structural steels

Contact Info

Product

Resources

About