大跨度双向张弦梁地震响应分析

Analysis of Anti-seismic Response on Bidirectional Beam String Structure

采用通用有限元软件AN SYS,对一个76 m跨的双向张弦梁结构模型进行了地震响应分析.选取3种不同矢跨比及3种不同预应力,分别考虑水平地震作用及竖向地震作用,分析其上部结构的抗震性能.在3种矢跨比情况下,随矢跨比的增大结构抵抗水平地震作用和竖向地震作用的变形能力逐渐增强;在水平地震作用和竖向地震作用下,随矢跨比的增大,轴力都逐渐减小.

By using the finite element software ANSYS, an analysis of anti-seismic response on bidirectional BSS with a span of 76 m is made. In order to analyze the earthquake-resistance capability, three different types of rise-span ratio and three different types of the pre-stress value are used to consider the horizontal-earthquake excitation and vertical-earthquake excitation. Under the three different types of rise-span ratio, with the rising of rise-span ratio, excitations the transfiguration ability of the structure against the horizontal-earthquake and vertical-earthquake excitations gets stronger. Under the horizontal- earthquake excitation and vertical-earthquake excitations, with the rising of rise-span ratio, the axial force is becoming smaller. Some of the conclusions can be refered to for project designing.