高烈度区独塔斜拉桥塔梁墩固结体系适用性研究

Study on Applicability of Tower-beam-pier Consolidation System of Single Tower Cable-stayed Bridge in High Intensity Area

为了研究独塔斜拉桥塔梁墩固结体系在高烈度区的适用性,采用IDA方法对桥梁结构进行了不同烈度地震响应分析,然后采用能力需求比法对关键截面进行了损伤状态分析,结果表明:独塔斜拉桥塔梁墩固结体系在高烈度区有一定的适用性,在地震烈度为8度的区域采用适当增加配筋等方式可提高桥梁结构抗震性能,不会过多增加投资,但在地震烈度为8.5度及以上区域,独塔斜拉桥塔梁墩固结体系的适用性较差。

In order to study the applicability of tower-beam-pier consolidation system of single tower cable-stayed bridge in high intensity area, the seismic response of the bridge structure with different intensities are analyze by IDA method. Then, the damage state of key sections is analyzed by capacity demand ratio method. Studies have shown that the tower-beam-pier consolidation system of single-tower cable-stayed bridge has certain applicability in high-intensity areas. In the area with an earthquake intensity of 8 °, that appropriately increasing reinforcement doesn’t increase too much investment. However, the applicability of the single-tower cable-stayed bridge with tower-beam-pier consolidation system is poorer in areas with an intensity of 8.5 ° and more.