采用抗拔不抗剪连接件的钢-混组合连续梁桥设计分析

摘要:

钢-混组合连续梁桥能够充分发挥钢材和混凝土两种材料的优点,在受力性能、综合造价、施工速度以及耐久性方面具有很多优势,在工程上应用越来越广泛。“抗拔不抗剪”技术通过释放连接件的抗剪作用,能够有效地解决钢-混组合连续梁桥负弯矩区混凝土的开裂问题。本文通过Midas建模,研究分析了“抗拔不抗剪”连接件组合梁与普通剪力钉组合梁的受力区别,结果表明：抗拔不抗剪连接件对负弯矩区桥面板轴力、应力和裂缝宽度的“消峰”作用非常明显,但会导致组合梁挠度和钢梁应力有所增加,设计时应综合考虑其对结构受力的影响。

Abstract:

Steel-concrete composite continuous beam bridge can give full play to the advantages of steel and concrete. It has many advantages in mechanical performance, comprehensive cost, construction speed and durability, and is widely used in engineering. "Uplift-restricted and slip-permitted the negative bending moment region by releasing the shear function of connectors. In this paper, the stress difference between composite beams with uplift-restricted and slip-permitted connectors and ordinary shear studs composite beams is studied and analyzed. The results show that the uplift-restricted and slip-permitted connectors have obvious "peak elimination" effect on the axial force, stress and cracking width of the bridge deck, but they will lead to an increase in the deflection of composite beams and the stress of steel beams. Therefore, their influence on structural stress should be comprehensively considered in design.