隧道掘进爆破下多层建筑的应力响应特征研究

STRESS RESPONSE CHARACTERISTICS OF MULTI-STOREY BUILDING CAUSED BY TUNNEL BLASTING EXCAVATION

以大连南部滨海城市公路隧道工程为背景,引入高阶模态分析方法,通过对建筑物进行爆破振动监测和结构振动响应测试,建立多层建筑物的三维数值模型,研究建筑物的高阶模态特性,探究爆破振动下建筑物局部构件的应力响应特征,并与低层建筑物的振动响应进行对比分析。结果表明五层房屋的振型模态受建筑物整体性的影响,高阶模态对建筑物局部损伤较大;随着峰值振速的增加,多层建筑物局部构件的主拉应力也会随之增大,可能发生损伤的构件会逐渐增多;隧道爆破振动下,二层砌体和五层砖混建筑上的最大拉应力或压应力发生的位置或应力值不完全相同,主要是结构动力响应除了与爆破地震波有关,还与结构本身的动力特性、结构型式等有关。

The high-order modal analysis method is introduced based on the coastal city highway tunnel engineering project in the south of Dalian. Through the blasting vibration monitoring and structural vibration response testing of buildings, the three-dimensional numerical model of multistory buildings is established. Furthermore, the high-order modal characteristics of buildings are studied. Additionally, the stress response characteristics of local components of buildings under the blasting vibration are explored, and the vibration response of low-rise buildings is also studied by comparative analysis. The results show that the vibration mode of the five-storey building is affected by the integrity of the building, and the high-order mode has great damage to the local part of the building;With the increase of the peak vibration velocity, the stress of local masonry members increases, and more and more members will be damaged;With the increase of the peak vibration velocity, the stress of local masonry members increases, and the components that may be damaged will gradually increase;Under the blasting vibration of the tunnel, the maximum tensile stress and compressive stress of the two story masonry and five story brick concrete building are different, mainly because the dynamic response of the structure is not only related to the blasting seismic wave, but also related to the dynamic characteristics and structural type of the structure itself.