混凝土重力坝抗震配筋的振动台模型试验

通过在坝体上下游表面的合理配筋提高混凝土坝的抗震能力对于保障坝体安全具有重要的意义。由于钢筋和混凝土之间的复杂相互作用以及大体积配筋混凝土的本构模型还不完善,针对几何比尺为1∶100的重力坝模型,采用满足弹性-重力相似率的低弹模、低强度混凝土仿真试验材料和满足配筋率相似关系的金属材料,通过分别施加人工波、丽江波和迁安波,进行了配筋与不配筋的振动台模型对比试验,根据相似比定量验证了抗震配筋的效果。试验结果表明,抗震配筋措施虽然对坝段的起裂没有明显的影响,但在大坝发生裂缝后,会限制裂缝的迅速扩展。研究结果对于高烈度地震动类似工程的抗震措施有着良好的工程参考价值。

Shaking Table Model Tests of Concrete Gravity Dam with and Without Seismic Reinforcement

In this paper, a gravity dam model with a geometric scale of 1:100 is applied. The low elastic modulus and low-strength concrete simulation materials which satisfy the elastic-gravity similarity rate and the metal materials which satisfy the similar relationship of the reinforcement ratio are applied. The comparative shaking table model tests of concrete gravity dam with and without reinforcement are carried out by applying artificial waves and Lijiang waves and Qianan waves respectively, and the effect of seismic reinforcement is verified quantitatively according to the similarity ratio. Experimental results show that although aseismic reinforcement has little effect for the initial crack of dam sections, the fast spreads of the cracks are obviously restricted after the crack occurs in the dam. The results are valuable for engineering in high-intensity seismic regions.