钢-UHPC组合结构大直径栓钉抗剪性能有限元分析

Finite element analysis of shear behavior of large diameter stud in steel-UHPC composite structure

为研究超高性能混凝土(UHPC)中大直径栓钉剪力连接件的静力性能,采用混凝土材料的损伤塑性模型,通过有限元数值模拟方法,对10组不同参数的栓钉剪力连接件的静力性能进行了对比和分析。研究参数包括栓钉直径、栓钉的长径比、混凝土强度和混凝土板的厚度。研究结果表明:装配大直径栓钉的普通钢混组合试件的混凝土板在测试中出现了大面积损伤,而装配大直径栓钉的UHPC板在测试中出现损伤的区域则较小;在UHPC板中,栓钉直径为30 mm的抗剪强度比栓钉直径为22 mm的抗剪强度高出约40%。栓钉长径比对试件静力性能的影响比混凝土板厚度对试件静力性能的影响更小。在参与测试的不同长径比的大直径短栓钉剪力连接件中,长径比为2.3的大直径短栓钉剪力连接件的抗剪性能最好。

To investigate the static performance of large diameter stud shear joints in ultra-high performance concrete(UHPC),the static performance of 10 sets of stud shear joints with different parameters was compared and analyzed by using a finite element numerical simulation method and by introducing a damage plasticity model of the concrete material.The parameters include the diameter of the studs,the length-to-diameter ratio of the studs,and the concrete strength and thickness of the concrete slab.The results show that the concrete slabs with large-diameter studs of the normal steelmixed composite specimens showed extensive damage in the tests,while the UHPC slabs with largediameter pegs showed less damage in the tests;in the UHPC slabs,the shear strength of the 30 mmdiameter studs was approximately 40%higher than that of the 22 mm-diameter studs.The effect of the stud’s length and diameter parameters on the static properties of the specimens was less than the effect of the concrete slab thickness parameters on the static properties of the specimens.Among the tested large-diameter short-stud shear joints with different length-to-diameter ratios,the large-diameter shortstud shear joints with a length-to-diameter ratio of 2.3 had the best shear resistance.