高寒大温差超长钢筋混凝土板抗冲击荷载数值模拟研究

Numerical simulation study on impact load resistance of super long reinforced concrete slabs with high cold and large temperature difference

在高寒大温差条件下,对超长钢筋混凝土板抗冲击荷载数值模拟进行了研究。结果表明:系统能量受冲击速度影响较大,预加荷载影响次之,受配筋率影响最小。在冲击速度处于3.0~10.5 m/s范围内时,系统能量改变幅度为2.09%~1.41%。当速度从0 m/s增加至3.0 m/s时,预加荷载从0 kN/m2增加为2.5 kN/m2时,板中心竖向位移从3.20 mm增加到3.46 mm,增幅为8.12%;速度从3.0 m/s增加至5.5 m/s时,板中心竖向位移从12.97 mm增加到13.75 mm,增幅为6.01%;在冲击速度增大为10.5 m/s时位移时程曲线,板中心竖向位移从56.12 mm增加到56.62 mm,增幅为0.89%。在进行钢筋混凝土板预加荷载的施加时,随着预加荷载的增加,冲击后板中心竖向位移随之增加,但增加幅值较小,预加荷载对板中心竖向位移具有较小影响。在其他条件相同时,冲击速度从3.0 m/s增大到5.5 m/s时,板中心竖向位移增幅为299.42%;冲击速度从5.5m/s增加到10.5m/s时,板中心竖向位移增幅为319.29%。板中心竖向位移受冲击速度影响最大,受预加荷载与配筋率的影响较小。

It studies the numerical simulation of the impact load resistance of ultra long reinforced concrete slabs under high cold and large temperature difference conditions.The results show that the system energy is greatly affected by the impact speed,followed by the influence of preload,and the least affected by the reinforcement ratio.When the impact speed is within the range of 3.0 m/s to 10.5 m/s,the system energy changes by from 2.09%to 1.41%.When the speed increases from 0 m/s to 3.0 m/s and the preload increases from 0 kN/m2 to 2.5 kN/m2,the vertical displacement of the plate center increases from 3.20 mm to 3.46 mm,an increase of 8.12%.When the speed increases from 3.0 m/s to 5.5 m/s,the vertical displacement of the plate center increases from 12.97 mm to 13.75 mm,with an increase of 6.01%.When the impact speed increases to 10.5 m/s,the displacement time history curve shows that the vertical displacement of the plate center increases from 56.12 mm to 56.62 mm,with an increase of 0.89%.When applying preload to reinforced concrete slabs,as the preload increases,the vertical displacement of the slab center increases after impact,but the amplitude of the increase is small.The preload has a small impact on the vertical displacement of the slab center.When the impact speed increases from 3.0 m/s to 5.5 m/s under the same other conditions,the vertical displacement of the plate center increases by 299.42%.When the impact speed increases from 5.5 m/s to 10.5 m/s,the vertical displacement of the plate center increases by 319.29%.The vertical displacement of the plate center is most affected by the impact speed,and is less affected by the pre imposed load and reinforcement ratio.