基于慢速时变动力学的空间结构施工过程精细化分析方法研究

Study on Refined Analysis Method of Construction Process for Spatial Structures Based on Slow Time-Varying Dynamics

针对空间结构施工过程模拟问题,依据时变力学基本原理,提出了基于慢速时变动力学的动态施工过程精细化分析方法。该新方法通过设置与实际施工动态过程相一致的分析时长,引入惯性力和阻尼力,实现时变结构几何、物理及边界等因素间的动态耦联,以达到真正意义上的施工全过程精细化分析。由此给出了该方法的求解思路和实现流程。通过对复杂大跨斜交连廊结构的施工过程分析,并对比施工实测数据,结果表明:该方法的计算值与传统静力施工过程分析方法相吻合,且总体上更接近工程实际,因此可用于空间结构的施工过程分析与安全评估;与传统静力施工过程分析方法相比,该方法一方面能够更准确反映实际施工过程中结构响应的动态累积效应,并获取任意时刻的结构受力和变形情况,另一方面,还可适用于强非线性的复杂施工过程分析(大变形、超大位移、机构位移等),从而避免了传统静力施工过程分析方法中非线性求解的收敛性难题。

Aiming at the construction process simulation of the spatial structures,a refined analysis method of the dynamic construction process based on slow time-varying dynamics was proposed according to the basic principle of time-varying mechanics.This new method realized dynamic coupling among the geometric,physical,and boundary factors of the time-varying structure by setting the analysis time consistent with the actual dynamic construction process and introducing the inertia force and damping force.Therefore,this method achieved the refined analysis of the whole construction process in practice.On this basis,the solution idea and implementation process of this method were given.The construction process of the complex long-span oblique corridor structure was analyzed,and the measured construction data was compared.The results show that the calculated values of this method are consistent with those of the traditional static construction process analysis method,which are generally closer to the engineering practice.Therefore,it can be used for the construction process analysis and safety assessment of spatial structures.Compared with the traditional static construction process analysis methods,this method can more accurately reflect the dynamic cumulative effect of the structural response in the actual construction process and obtain the stress and deformation of the structure at any time.Moreover,it can also be applied to the analysis of complex construction processes with strong nonlinearity,such as large deformation,large displacement,and mechanism displacement,etc.,avoiding the difficulty of convergence of nonlinear solution in traditional static construction process analysis methods.