影响轻骨料混凝土梁自振频率的因素

为了研究材料特性和截面特性对钢筋轻骨料混凝土简支梁固有频率的影响，采用有限元方法对其组成材料及截面尺寸进行研究分析．分析结果表明．强度等级在LC30以下的轻骨料混凝土梁．自振频率随强度的增加而增大，且增加幅度也增大；强度等级在LC30以上时．频率随强度增加且增速减缓．频率随配筋率的增加而增加，且增长速度由快至慢；箍筋对频率的影响较小．当梁高宽比不大于1时．频率随高宽比的变化很小，近似不变；而当梁高宽比大于1时．频率随高宽比的增大而增长较快．且数值比小于1的情况大得多．

Factors in natural frequency of lightweight aggregate concrete beam

In order to investigate the natural frequency of the reinforced lightweight aggre gate concrete beam affected by materials characteristics and sectional characteristics, this pa per adopts finite element method and the results indicate that natural frequency of light weig with ht aggregate concrete beam of which intensity levels is below the LC30 increases largely the intensity raised, and the frequency increases slowly when it is above the LC30. The value of the frequency increases with the reinforcement ratio, but the speed drops off; stirrup impacts less on the frequency; when the beam aspect ratio is not exceeding 1, the frequency changes little; when aspect ratio is larger than l, the frequency increases rapidly with the increase of aspect ratio, and the frequency value is larger than the former