地下咬合型管幕构件抗弯刚度参数分析

Parameter Analysis of Flexural Stiffness of Underground Secant Pipe Roof Structure

基于咬合型管幕构件的抗弯性能试验,运用ABAQUS建立了咬合型管幕构件的有限元模型,并通过室内试验标定有限元模型.研究了在不同参数组合下咬合型管幕构件的抗弯刚度变化规律,并以此来找到最优的结构参数组合.研究结果表明,钢管直径与咬合程度在提升构件抗弯刚度上具有一定的相互作用影响,当钢管咬合程度与钢管直径比值在0. 16~0. 28时,构件具有较好的抗弯性能;钢管直径、钢管壁厚及钢筋直径与构件抗弯刚度均呈线性正相关;钢管直径对提升咬合型管幕构件的抗弯刚度具有显著作用,其次是钢筋直径和钢管壁厚.

Based on the flexural behavior tests of secant pipe roof structure(SPRS),finite element models(FEMs)of the SPRS were established using ABAQUS and calibrated based on the laboratory tests.The influences of different parameters on flexural stiffness of SPRS were investigated,and the optimal parameters were given.The results showed that the overlapping distance between the adjacent tubes and the tube diameter interacts with each other in terms of the flexural stiffness.When the ratio of the overlapping distance to the tube diameter is between 0.16 and 0.28,the specimens have better bending resistance.The tube diameter,the tube thickness and the bar diameter have a linear correlation with the flexural stiffness.The tube diameter has a significant impact on the flexural stiffness of SPRS,followed by the diameter of the reinforcement and the tube thickness.