某公路跨线高架桥梁为上下行双线钢筋混凝土结构，单线桥面宽12 m，引桥北段6跨（墩号4-9）、南段5跨（墩号12-16）及主桥（墩号10、11）采取爆破拆除，周围环境复杂，需对爆破飞石、触地振动等危害重点防护，基于显式非线性动力分析有限元软件ANSYS/LS-DYNA，对钢筋混凝土主桥墩柱在爆炸冲击波载荷和破片群侵彻载荷的联合作用进行数值模拟计算，模拟桥梁爆破坍塌全过程。研究对称起爆、单向起爆和中间起爆三种爆破方案，对后处理软件 LS-Prepost中导出的爆堆参数进行评价，若只考虑爆堆因素时，中间起爆最好，单向起爆次之，对称起爆最不利；触地振动的数值模拟结果表明，触地振动峰值由大至小顺序：对称起爆、中间起爆、单向起爆，均在安全允许值内；对左、右线内、线间选择不同的延期时间爆破网路，综合考虑爆堆参数、触地振动值等评价指标，长延期爆破效果优于短延期爆破方案。综合选定单向起爆、左右线内、线间长延期爆破方案，实际爆破效果与数值模拟效果整体吻合，各项指标都符合相应的规程要求，所使用的各种减振技术取得很好减振效果。

The fiber Bragg grating (FBG) sensing technology was used to monitor the situation of a crevice of the continuous beam joint and rails near rail expansion devices on a viaduct of the urban railway. The monitoring items consisted of the rail temperature, rail displacement, viaduct beam displacement, and strain of sliding rail in the rail expansion device section. The strain sensor was a prefabricate FBG strain gauge, the displacement sensor with different scales used an FBG stress ring, and the FBG of the temperature sensor was pre-drawn and fixed in a metal tube. Compensation sensors were used to balance environmental temperature changes. All FBGs were suspended adhered, therefore the chirped phenomenon of the FBG reflection peak was avoided, and the measurement accuracy was improved. The monitoring results matched to the manual test and theoretical estimation.