Research on the impact resistance performance of web opening high-strength steel beams under impact loading
To investigate the impact resistance performance of web-opening high-strength steel beams(WOHSSBs),nine specimens are designed and subjected to falling hammer impact tests,which mainly considered the effects of impact energy,spacing between opening and opening height on their impact resistance performance.The experimental results show that,as the impact energy increased from 26.5kJ to 51.9kJ,the average increase in mid-span displacement peak and impact force plateau is 19.39％and 2.02％,respectively.For every 20mm increase in opening height,the average mid-span displacement increases by 29.02％.Additionally,for every 20mm increase in spacing between opening,the average impact force plateau increased by 17.59％.The peak value of the bearing reaction force is delayed by 2.27ms on average compared with the peak value of the impact force,exhibiting a noticeable"time lag effect".To enhance the impact resistance performance of WOHSSBs,specimens with five different stiffening methods are designed.Numerical simulations are conducted to analyze the impact resistance of these beams under various stiffening methods.The analysis indicates that incorporating stiffeners can improve the impact resistance performance of WOHSSBs,The effectiveness of setting horizontal stiffeners,horizontal and vertical composite stiffeners and opening flange stiffeners on the impact resistance performance is greater than that of other stiffening methods.
web opening high-strength steel beamfalling hammer impactnumerical simulationstiffenerimpact resistance
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