组合梁中栓钉受力的有限元模拟分析

Numerical Investigation into the Structural Behaviour of Shear Connectors in Composite Beams

本文提出了一个模拟组合梁栓钉受力性能的有限元模型,该模型采用8节点实体单元来模拟混凝土楼板、钢梁与栓钉,压型钢板则采用8节点双曲度壳单元来模拟。该模型充分考虑了荷载及边界约束情况,并假设压型钢板与混凝土楼板之间无相对滑移。本文应用该模型对一系列栓钉推出试验进行了模拟分析,结果表明该有限元模型能精确地模拟组合梁中栓钉的受力性能。此外,本文还研究了无侧向支撑试件在推出试验中的非成熟破坏问题,解释了破坏机理,提出了有效防止方法。

A generalized advanced finite element model is proposed for the study of structural behaviour of shear connectors in push-out tests. Concrete slabs, steel beams and shear connectors are modelled with eight nodedsolid elements; while profiled steel deckings are modelled with eight noded double curvature shell elements. It is assumed that steel deckings arc bonded perfectly to concrete slabs, so that there is no relative slippage between steel deckings and concrete slabs. The accuracy of the model is verified through the calibration against a series of push out tests comprising different material and gemetrical properties as well as boundary conditions. This ensured the general applicability of the proposed model. Pre-mature failure in un-hraced specimens due to flexural bending and global cracking in concrete sections was also studied in great details, which provides in depth understanding and also suggests effective precausion measures against this failure mode.