Abstract: The continuous rigid frame bridge with corrugated steel webs is a new type of bridge structure, which combines the high strength and strong deformation ability of steel and the good compressive performance of concrete. The detailed structure of its shear connectors has a decisive influence on the overall bearing capacity. In order to further explore the mechanical behavior of Twin-PBL shear connectors and further improve their mechanical properties through the optimization of detailed structure, a solid finite element model of a typical box girder segment with corrugated steel webs was established based on ABAQUS software. The mechanical performance of Twin-PBL shear connectors between corrugated steel webs and concrete roofs was studied, and the influence rule of the presence or absence of transverse through rebar structure on the shear performance of Twin-PBL shear connectors was revealed. The structural parameters of the aperture, thickness and transverse through rebar diameter of the perforated steel plate were further optimized and selected. The research shows that the setting of transverse penetrating steel bars in Twin-PBL shear connectors can reduce the shear stress of perforated steel plates and steel flange plates, and the penetrating steel bars can share part of the shear force of concrete tenons in the holes. Therefore, comprehensively considering factors such as material properties and manufacturing processes of perforated steel plates, the optimal opening diameter of Twin-PBL connectors with a cross-section height of 180 mm is 70 mm, the diameter of transverse penetrating steel bars is 25 mm, and the thickness of perforated steel plates is 28 mm.

Key words: bridge engineering; Twin-PBL shear connector; mechanical property; structure optimization; composite box girder with corrugated steel webs

摘要： 波形钢腹板连续刚构桥是一种新型的桥梁结构形式，其结合了钢的高强度、强变形能力和混凝土的良好抗压性能，其剪力连接件的细部构造对整体承载能力有着决定性的影响。为深入探索Twin-PBL剪力连接件的力学行为，并通过细部构造优化来提高其力学性能，基于ABAQUS建立了典型波形钢腹板箱梁节段的实体有限元模型，研究了波形钢腹板与混凝土顶板之间Twin-PBL剪力连接件的力学表现，揭示了横向贯穿钢筋构造的有无对Twin-PBL剪力连接件抗剪性能的影响规律，并对开孔钢板孔径、厚度及横向贯穿钢筋直径进行了结构参数优选。研究表明：Twin-PBL剪力连接件设置横向贯穿钢筋能够降低开孔钢板和钢翼缘板的剪应力，且贯穿钢筋分摊了孔洞内混凝土榫的部分剪力；综合考虑开孔钢板的材料属性、制作工艺等因素，对开孔钢板截面高度为180 mm的Twin-PBL连接件，最优开孔直径为70 mm，横向贯穿钢筋直径为25 mm，开孔钢板厚度为28 mm。

关键词: 桥梁工程；Twin-PBL剪力连接件；力学性能；构造优化；波形钢腹板组合箱梁