大跨隧道近距下穿书画院高阶模态及爆破应力响应研究  

Study on high-order mode and blasting stress response for large-span tunnel passing through painting and calligraphy institute

作　　者：余志伟[1] 管晓明[1] 王旭春[1] 胡宇斌 杨占猛 刘会丰 张守将[3] 安建永[4] YU Zhi-wei;GUAN Xiao-ming;WANG Xu-chun;HU Yu-bin;YANG Zhan-meng;LIU Hui-feng;ZHANG Shou-jiang;AN Jian-yong(College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;Beijing Municipal Construction Group Co., Ltd, Beijing 100045, China;Beijing Municipal Three Construction Engineering Co., Ltd, Beijing 100022, China;China Construction Second Engineering Bureau Ltd, Beijing 100160, China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]北京市政建设集团有限责任公司,北京100045 [3]北京市市政三建设工程有限责任公司,北京100022 [4]中国建筑第二工程局有限公司,北京100160

出　　处：《广西大学学报（自然科学版）》2019年第4期1085-1091,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金青年基金资助项目(51708317);中国博士后科学基金面上项目(2017M621095);山东省自然科学基金资助项目(ZR2016EEB27);中建股份科技研发课题(CSCEC-2016-z-21)

摘　　要：为研究大跨隧道近距下穿建筑物时爆破振动对隧道周边建筑物的损伤。依托南方某公路隧道爆破工程,选取典型的建筑物——书画院4号楼,利用ANSYS建立书画院全结构模型,探究其高阶模态特性,并分析不同爆破峰值振速下的书画院应力响应特征。结果表明:书画院1~6阶为低阶整体模态,频率为4.16~12.99Hz,振型为建筑物整体变形;7~20阶为高阶局部模态,频率为13.65~24.03Hz,振型以左侧墙体、屋檐、一层横墙和二层中隔墙等局部构件变形为主;应力水平最高的是门角、窗角等应力集中部位,其峰值是横墙的11.6~18.4倍,在峰值振速较低时(1.0cm/s)就有可能在瞬间产生很高的应力,超过抗拉强度,造成损伤破坏。次高的是高阶模态中振动较大的局部构件,如门窗连接处、左侧墙面和二层中隔墙,应力水平也较高,其峰值是横墙应力的5.4~11.1倍。随着峰值振速的不断增大,到达3.0cm/s和6.0cm/s时,门窗连接处墙面、左侧墙面和二层中隔墙就可能会发生损坏;主要的横墙承重构件一般不会发生损伤。数值计算结果表明,高阶模态能较好的解释爆破振动下结构局部损伤的原因。In order to study the damage of the blasting vibration to the buildings around the tunnel when a large-span tunnel passes through the building at a short distance, on the basis of a road tunnel blasting project in the south --a typical building, a building of a Painting and Calligraphy Institute, was selected.The full structural model of the Painting and Calligraphy Institute was established by ANSYS, and its high-order modal characteristics was studied, and the stress of the Painting and Calligraphy Institute under different peak speeds of blasting was analyzed.The results show that:the 1~6th order of the Painting and Calligraphy Institute is a low-order overall mode with a frequency of 4.16~12.99 Hz, and the vibration mode is the overall deformation of the building.The 7~20th order is a high-order local mode with a frequency of 13.65~24.03 Hz, and the vibration mode is mainly composed of local components such as the left wall, the eaves, the first layer of the cross wall and the second layer of the partition wall.The highest stress level is the stress concentration part such as the door angle and the window angle, and the peak value is 11.6~18.4 times of the cross wall.It is possible to generate high stress in an instant under a lower peak vibration velocity, which will exceed the tensile strength and causing damage.The second highest is the high-order modal vibration of the local components, such as the door and window joints, the left wall and the second-layer partition wall, the peak value is 5.4 ~ 11.1 times of the cross-wall stress.As the increase of the peak vibration velocity, the wall of the door and window joint, the left wall and the second-floor partition may be damaged when reaching 3.0 cm/s and 6.0 cm/s.The main cross-wall load-bearing members are generally not damaged.The numerical results show that the higher-order modes can better explain the local damage of the structure under blasting vibration.

关 键 词：大跨隧道 爆破振动 建筑物 高阶模态 应力响应 局部损伤 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]