体外预应力钢混凝土连续组合梁非线性数值分析

Nonlinear Finite Element Analysis of Prestressed Continuous Steel-concrete Composite Beams with External Tendons

基于4根预应力连续组合梁试验,以通用非线性程序ABAQUS为平台,提出了用于模拟预应力连续组合梁非线性全过程受力行为的精细有限元模型.模型综合考虑了几何非线性、材料非线性、支座负弯矩区板件整体失稳和局部失稳等,不仅反映预应力连续组合梁整体性能,还模拟局部效应,深入揭示预应力筋内力变化、滑移效应、内力重分布、板件整体失稳及局部屈曲等复杂特性.通过对模型计算和实测结果的充分对比与校核,表明该模型用于预应力钢-混凝土连续组合梁的精细化分析具有较高精度和广泛通用性,表现出良好的数值特性,为研究预应力连续组合梁受力性能提供了强有力的数值工具.

Based on test analysis of four prestressed steel-concrete beams,allowing for the nonlinearity of geometry and material,the lateral distortional buckling and the plate local buckling a fine and exact finite element stimulation model by ABAQUS is established to study the the nonlinear development of beams,which reflects the overall behavior of the beam and catches the local effect,such as the stress varying in prestressed tendons,the slip,the redistribution of internal forces,the overall instability and local buckling.Compared the results by the FE model with the tests carefully and strictly,the FE model is of excellent numerical function with enough accuracy and versatility,which provides a powerful numeral tool for the research of continuous steel-concrete beams prestressed with external tendons.