沉井式地下车库承载特性数值分析与结构优化

Numerical analysis of load-bearing characteristics and structural optimization of caisson underground garage

为研究连续拱形组合截面沉井式地下车库的受力特性,采用Ansys软件分别建立拱脚固接和拱脚铰接2种连接方式的不同跨数标准节间的连续拱形组合截面沉井的数值模型,分析构件的弯矩变化规律。结果表明:当标准节间外拱墙圆弧的迹线位于同一圆弧时,相应矢跨比为外拱墙弯矩接近为0的最优值。当标准节间跨数、拱脚连接方式、标准节间长宽比发生改变时,这一结论仍然适用。

To study the mechanical characteristics of the caisson underground garage with continuous arch composite section,the numerical models of continuous arch composite section caisson with different number of standard spans using the arch foot fixed connection and the arch foot hinged connection are built in Ansys software.The bending moment change law of the members is analyzed.The results show that when the trace of the arc of the outer arch wall of the standard section is located in the same arc,the corresponding rise-span ratio is the optimal value while the outer arch wall bending moment close to 0.This conclusion is still applicable while the number of standard internode spans,the connection mode of arch foot and the ratio of length to width of standard internode change.