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【单选题】
对于梁的横向微振动问题，以下说法正确的是（）
A.
在欧拉—伯努利梁的基础上考虑剪切变形的影响，得到的固有频率会偏大，相当于降低了有效刚度
B.
在欧拉—伯努利梁的基础上考虑转动惯量的影响，得到的固有频率会偏小，相当于增加了有效质量。
C.
考虑轴向拉力对梁振动的影响，得到的固有频率比不考虑轴向拉力影响时的固有频率高，相当于降低了弯曲刚度。
D.
是否 考虑轴向力对梁的振型函数的表述形式有影响。
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