跨隧道高层住宅结构抗震性能研究

Study on seismic performance of the high-rise residential structure striding across the tunnel

深圳某103.5m高层住宅采用钢筋混凝土剪力墙结构体系,下方约40m深处有直径15.2m的隧道穿过。为保障转换结构合理有效,本文设计了桁架转换和空腹桁架转换2个跨隧道结构方案,从受力性能、层间变形、损伤分布等方面分析了两结构抗震性能,并考虑构件屈服顺序与损伤程度探讨了结构抗震概念。研究结果表明,转换桁架竖向刚度对结构性能至关重要,转换桁架是结构关键部位,桁架腹杆是结构关键构件。在地震作用下,空腹桁架转换结构的整体塑性发展程度与构件损伤程度均高于桁架转换结构。空腹桁架转换结构中转换桁架的构件与剪力墙底部的构件损伤程度均显著高于桁架转换结构。桁架转换结构合理构件屈服顺序表现为连梁、剪力墙、桁架弦杆、桁架腹杆。

A high-rise residence in Shenzhen with the height of 103.5 meters adopts reinforced concrete shear wall structure, and a tunnel with the diameter of 15.2 meters passes through it at a depth of about 40 meters below it. In order to ensure the rationality and effectiveness of the transfer structure, two structures striding across the tunnel were designed using truss transfer and vierendeel truss transfer in this paper. The seismic performance of the two structures is analyzed from the aspects of mechanical performance, drift and damage distribution, and the structural seismic concept was discussed considering the yield order and damage degree of members. The results show that the vertical stiffness of the transfer truss is very important to the structural performance. The transfer truss is the key part of the structure, and the web members of the truss is the key member of the structure. Under earthquake, the overall plastic development degree and member damage degree of vierendeel truss transfer structure are higher than those of truss transfer structure. The damage degree of the members in the transfer truss and in the bottom of the shear wall in the vierendeel truss transfer structure is significantly higher than that in the truss transfer structure. The reasonable yield order of truss transfer structure members is shown as coupling beams, shear walls, chord members of truss and web members of truss.