论混凝土坝抗震设计与计算中混凝土动态弹性模量的合理取值

On the dynamic elastic modulus of concrete in the anti-earthquake design of concrete dams

目前我国混凝土坝抗震设计与计算中,混凝土动态弹性模量取值偏小较多,其结果导致动态变位和坝体自振周期偏大,而地震荷载偏小。笔者给出了混凝土坝抗震设计和计算中混凝土动态弹性模量的合理取值方法。

The value of the dynamic elastic modulus of concrete adopted in the anti-earthquake design of concrete dams is too low. As a result, the computed dynamic displacements and the natural periods of vibration are two large and the computed earthquake loads are two low. It is suggested to compute the dynamic elastic modulus of concrete by Ed = rdEs, where Es is the instantaneous elastic modulus of concrete and rd is a coefficient greater than 1.0, rd ≌ 1.15.