桥梁抗震挡块拟静力试验研究

Quasi-static Test Research on Seismic Blocks of Bridges

通过5个桥梁横向挡块在低周反复荷载下的试验,研究不同箍筋形式、不同厚度和不同撞击高度的桥梁横向挡块的抗震性能。结果表明,采用非封闭箍筋挡块时,其延性能力明显差于采用封闭箍筋挡块;采用封闭箍筋挡块时,其挡块破坏主要表现为弯剪破坏模式,且其承载能力随着厚度的增加而增加。根据挡块的破坏机理,提出挡块抗震能力计算公式。

Based on the test of 5 lateral blocks of bridges under low cyclic loads,this paper probes into seismic properties of lateral blocks of bridges in different stirrup forms,different thicknesses and different impact heights.The results show that the ductility ability of non-closed stirrup blocks when employed is obviously inferior to closed stirrup blocks;when closed stirrup blocks are adopted,the damages to blocks mainly manifest bending and shearing failures,and their bearing capacity increases with thickness.The paper also proposes calculating formula for seismic capability of blocks in accordance with failure mechanism of blocks.