不锈钢钢筋等截面替代RC梁撞击力学性能试验研究

Experimental Study on Impact Mechanical Properties of RC Beams Replaced by Stainless Steel Bars with Constant Cross Section

利用不锈钢钢筋等截面替代普通钢筋混凝土梁中的受力钢筋解决海洋环境中钢筋腐蚀等问题,采用国内先进的超高重型落锤冲击试验机系统对六根钢筋混凝土梁进行竖向抗冲击试验,采集撞击过程中的冲击作用力、试件测点的位移和应变,并进行分析.结果表明:(1)配筋率较小时(0.21%~0.58%),不锈钢钢筋等截面替代普通钢筋后能有效提高梁整体刚度及弹性恢复能力,降低结构变形,可采用不锈钢钢筋等截面替代普通钢筋解决钢筋腐蚀问题;(2)配筋率较大时(1.04%~2.20%),不锈钢钢筋等截面替代普通钢筋后延性较差,特别是冲击能量较高时,脆性性质更加明显.

Stainless steel bars of equal cross-section is used to replace steel bars in ordinary reinforced concrete beams to solve corrosion problems of steel bars in marine environment.The vertical impact test of six reinforced concrete beams was carried out by using the advanced impact testing system of ultra-high heavy weight drop hammer in China.The impact forces during the impact process,the displacement and strain of the measuring points of the specimens were collected and analyzed.The results show that:(1) when the reinforcement ratio is small (0.21%~0.58%),the stiffness and elastic recovery ability of the beam can be improved effectively after the replacement of the same section,and the deformation of the structure can be reduced.Stainless steel bars can be used to replace common steel bars to solve the corrosion problem.(2)when the reinforcement ratio is higher (1.04%~2.20%),the ductility of stainless steel bar with equal cross-section is worse than that of ordinary steel bar,especially when the impact energy is high,and the brittleness becomes more obvious.