钢纤维增韧混凝土抗冲击性能研究综述

Review on impact resistance of steel fiber reinforced concrete

对钢纤维增韧混凝土抗冲击性能展开了研究,研究了在不同应变率和钢纤维体积掺量的条件下,混凝土动态峰值压应变、吸能能力、动态弹性模量增长系数和动态抗压强度增长系数的变化。结果表明:钢纤维增韧混凝土的动态峰值压应变、吸能能力、动态抗压强度增长系数和动态弹性模量增长系数均随应变率的增加而增加。随着钢纤维体积掺量增加,混凝土动态抗压强度和吸能能力逐渐增加,动态弹性模量增长系数逐渐减小。适量钢纤维可以提高混凝土的动态峰值压应变,当钢纤维掺量为1.5%时,混凝土动态峰值压应变达到最大值,掺入过多钢纤维会导致峰值压应变降低。建立了钢纤维增韧混凝土动态弹性模量增长系数、动态抗压强度增长系数和能量吸收、动态应变率和钢纤维体积掺量的计算式。

The impact resistance of steel fiber reinforced concrete is studied.The dynamic peak compressive strain,ability to absorb en-ergy,dynamic elastic modulus growth coefficient and dynamic compressive strength growth coefficient of concrete are studied under dif-ferent strain rates and steel fiber volume content.The results show that the dynamic peak compressive strain,ability to absorb energy,dy-namic compressive strength increase coefficient and dynamic elastic modulus increase coefficient of steel fiber toughened concrete increase with the increase of strain rate.With the increase of steel fiber volume content,the dynamic compressive strength and the ability to absorb energy of concrete increase gradually,while the dynamic elastic modulus increase coefficient decreases gradually.Appropriate amount of steel fiber can improve the dynamic peak compressive strain of concrete.When the content of steel fiber is 1.5%,the dynamic peak com-pressive strain of concrete reaches the maximum value,and too much steel fiber will lead to the decrease of the peak compressive strain.The formulas of dynamic elastic modulus growth coefficient,dynamic compressive strength growth coefficient,ability to absorb energy,dynamic strain rate and volume content of steel fiber toughened concrete are established.