大跨空间结构临时支撑卸载的施工内力分析及非线性时变模型的探讨

Research on the construction internal force analysis and nonlinear time-varying model of load-relieving process of temporary support of long-span space structures

对大跨空间结构体系施工卸载过程进行研究,分析卸载过程施工内力计算所面临的困难和相关研究现状,探讨了临时支撑卸载的非线性时变力学过程和目前常用的两种有限元分析模型,并在此基础上提出了适用于卸载过程分析的位移荷载时变模型。采用该模型对两跨连续梁的卸载过程进行施工内力计算,分析结果表明位移荷载时变模型能够较好的模拟整个卸载过程,且相对于常用的两种分析模型来说有其自身的优越性,因此将位移荷载时变模型应用于实际工程的施工内力计算也是完全可行的。

Research on load-rclicving process in the construction process of long-span space structures, analysing the difficulty in calculating inner force and relevant research of present status, nonlinear time-varying mechanical process and two common finite clement analytic model of temporary supports in load-relieving process is rescarchccl, on thc basis of the above analysis, dcformatlon time-varying model is presented for the analysis of load-relieving process. The load-relievcing process of two span continuous beam is simulated by using deformation time-varying model, the analysis results show that deformation time-varying model can simulate thc load-relieving process better and has its own advantages comparing with two common analytic modcl, therefore it is fcasihlc that dcfurmation timevarying model is applied to analysis of construction internal force of cnglnnecring project.