地铁爆破施工对装配式建筑物的动力响应分析

THE DYNAMIC RESPONSE OF SUBWAY BLASTING OF PREFABRICATED BUILDINGS

为保证城市地铁爆破施工过程中临近装配式建筑物的安全,分析爆破振动作用下装配式建筑物动力响应特性是其关键。文中依托武汉市地铁11号线爆破工程,选取周围装配式建筑物为研究对象,利用SAP2000软件建立装配式建筑物结构模型,通过探究其低阶模态特性来分析不同爆破峰值振速下装配式建筑物加速度、位移及应力响应特征。研究结果表明,装配式建筑物自振频率为4~6 Hz,并逐渐稳定在6 Hz;振动加速度在第2层达到最大值,且各层的位移最大值随着层高的增加而增加;节点应力均大于梁、柱子、楼板的应力,说明装配式建筑物的节点是受力薄弱部位。

To ensure the safety of nearby prefabricated buildings during the blasting construction of urban subways,the dynamic response characteristics of prefabricated buildings was analyzed under the action of blast vibration.Taking a blasting project of Wuhan Metro Line 11 as the case,this paper uses SAP2000 software to establish the structural model of and analyzes the prefabricated building under different blasting peak vibration speeds by exploring its low-order modal characteristics including building acceleration,displacement and stress response.The results show that the natural frequency of prefabricated buildings is 4~6 Hz,gradually stabilized at 6 Hz;The vibration acceleration reaches the maximum in the second floor,and the maximum displacement of each floor increases with the increase in floor height;The node stresses are all greater than the stresses of beams,columns,and floor slabs,indicating that the nodes of prefabricated buildings are weak parts of the force.