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RISS 인기검색어
- 검색키워드
- 저자 : Bingsheng Huang (검색결과 4 건)
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Bingsheng Huang,Yiwei Zhang,Ranyang Zhang,Fang Yang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
Through the transient test on two welded hollow spherical joints subjected to compression under fire, the temperature distribution, displacement characteristics, failure mode and ultimate fire resistance time of the joint under different load ratios were obtained under standard fire. The three-dimensional finite element model of welded hollow spherical joints was established, and the performance of the joints subjected to compression under fire was analyzed. Compared with the test results, the correctness of finite element simulation analysis was verified. The results showed that during the heating process, the surface temperature of the sphere inside the steel pipe is the lowest. The surface temperature of the sphere is low at the intersection with the steel tube and is highest at the middle-latitude of the sphere. The surface temperature of sphere is lower than ISO-834 standard heating curve. Failure mode of axially compressed welded hollow spherical joints under fire is concave failure. Failure position is at the sphere connected with the steel pipe. Failure process is short. Fire resistance time of load-ratio 0.35 specimen is more than 20% longer than that of load-ratio 0.6 specimen. The critical temperature of the current fire protection code is smaller than the results of the finite element.
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Experimental Investigation on Tensile Properties of the Bolt in Sphere Joints Under Fire
Bingsheng Huang,Meng Lu,Yidong Fu,Fang Yang 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
As a common type of joint used in spatial grid structures, the tensile performance of bolt-sphere joints directly aff ects the safety of the spatial grid structure under fi re. To study the tensile properties of the bolts in sphere joints under fi re, the four sets of 36 bolt-sphere joints consist of M20, M24, M30, and M36 high-strength bolts were conducted in elevated temperature by steady-state test. Therefore, the tensile bearing capacity of the bolt-sphere joint was obtained under diff erent elevated temperatures. Experimental results show the destroyed section of the bolt-sphere joint that occurs in the thread of the highstrength bolt at the intersection of the sphere because of the maximum concentration of stresses that occurred in areas of destruction. The brittle fracture of bolt-sphere joints happened when the temperature is below 400 . As the temperature increased, the neck shrinkage of the damaged section of the bolt becomes more apparent, and the ductile failure of the boltsphere joint occurred. The stiff ness and the bearing capacity of bolt-sphere joints decreased gradually as the temperature rose. Conversely, the ductility was gradually increasing. When the temperature was greater than 300 , the stiff ness and the bearing capacity of the bolts in sphere joint decreased rapidly. The bearing capacity reduction coeffi cient of the highstrength bolts with diff erent diameters were next to the same at elevated temperatures. According to the experimental data, the formulas of the tensile bearing capacity reduction coeffi cient of bolt-sphere joints were obtained.
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Refractory Performance of the Axial Tensile Welded Hollow Spherical Joint
Xiaobin Qiu,Bingsheng Huang,Haoyu Song,Zhen Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
To study the refractory performance of the axial tensile welded hollow spherical joint, the steady-state test of heating under constant load was carried out on the joint specimens with different load levels. The failure modes, temperature field, displacement-time curves, and refractory performance of the spherical joints exposed to fire are investigated and analyzed. The experimental results indicate that the failure modes of the joints exposed to fire are pull-out failures. The failure location is at the intersection of the steel tube-hollow sphere. The lowest temperature is located at the intersection of the steel tube-hollow sphere. The closer you get to the equator of the hollow sphere, the higher the spherical temperature. The smaller the load level, the higher the refractory temperature and the longer the refractory limit of the joints. The correctness of the numerical model was verified by comparison with the experimental result. Numerical simulations show that with the increase of the load levels, the refractory performance of the joints gradually decreases, and the downward trend gradually slows down. Compared to the refractory temperature code-recommended, the refractory temperature of the tensile joints is very conservative.
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Study of Fire Resistance Performance of Stiffened Welded Hollow Spherical Joint Under Axial Tension
Xiaobin Qiu,Tao Chen,Bingsheng Huang,Jingrui Zhu,Zhen Zhang,Haoyu Song 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
To study the fire resistance performance of stiffened welded hollow spherical joints under axial tension, two specimens with load ratios of 0.4 and 0.6 were subjected. The temperature distribution, failure mode, and fire resistance performance of stiffened welded hollow spherical joints under axial tension were obtained. The test results show that the failure mode of the joint was a pull-out failure. During the heating process, the closer to the spherical equator, the higher the spherical temperature, and the temperature of the sphere at the stiffener is lower than that of the sphere at the non-stiffener. The load ratio has a great influence on the refractory performance of the stiffened welded hollow sphere joint. When the load ratio of the specimen is reduced from 0.60 to 0.40, the fire resistance time of the specimen increases by 4.47 min, and the critical temperature increases by 21.3 °C. According to the European Code, the finite element model for the stiffened welded hollow spherical joints is established. The effect law of various influencing factors on the fire resistance performance of stiffened welded hollow spherical joints is studied. The research results show that reducing the load ratio and increasing the thickness of the sphere can significantly improve the fire resistance performance of the joint. The calculation formula of the critical temperature of steel members in the current standard not suitable for the calculation of the critical temperature of the welded hollow spherical joint. The critical temperature values with different load ratios recommended by the current standard were relatively more conservative. Taking the ambient temperature as the fire resistance temperature, the finite element analysis results were fitted, and the formula for calculating the fire resistance temperature of the stiffened welded hollow spherical joint was proposed.
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