爆破边载对斜拉桥结构动力响应分析

施工爆破往往对既有临近建筑物的影响很大。针对这种边载效应可能造成的危害,结合爆破数值模拟中爆破荷载的特点,基于圣维南原理,将作用在炮孔壁上的爆破荷载等效后,施加在同排炮孔联心线或者面上,以模拟爆炸作用。采用三维实体模型等效模拟计算分析东海大桥在远场爆破施工对既有桥体结构稳定性的影响,计算结构不同位置、不同工况的振动响应和不同距离的最大单响药量,在此基础上,分析桥梁结构受爆破边载影响的危险区域,提出不同距离的药量控制,可为类似工程提供借鉴。

Dynamic respond of cable-stayed bridge subjected to blasting load

Blasting engineering usually has great influence on adjacent buildings,for this edge load may cause some harm.Combining with characteristics of the blasting loads in blasting numerical simulation,the equivalent load was applied to the line of centers or the surface of blast hole in the same row to simulate explosion effect based on the Saint Venant’s principle,after making the blasting load applied to the blast hole wall equivalent by the equivalent applying method of the blasting load.Based on the equivalent load applying method,the three-dimensional entity model was used to calculate and analyse the effects of Donghai bridge in the far field of blasting construction on the stability of existing structures.The largest single explosive charge of different positions,different working conditions and different vibration response were calculated.Based on these results,the dangerous area of bridge structure was analyzed under the effects of the blasting edge load,the control of blasting quantity was put forward in different distances,which may serve as a reference for similar projects.