滚压螺旋肋灌浆套筒对中搭接性能试验及有限元分析

Experimental and finite element analysis of middle overlapping performance of roll-formed spiral-ribbed grouting sleeve

摘要:

为响应发展新型、节能、高效的建造方式的要求,提出一种采用滚压加工工艺加工无缝钢管制作而成的螺旋肋套筒,该种套筒具有造价低、制造工艺和施工技术简单的优点,并且加工而成的螺旋肋可大幅提高套筒与灌浆料之间的机械咬合力。在传统灌浆套筒连接接头性能研究的基础上,创新性地提出一种对中搭接套筒连接形式,并采用螺旋肋套筒制作了14个对中搭接灌浆套筒试件,进行单向拉伸试验研究其力学性能。此外,利用ABAQUS进行灌浆套筒试件的有限元模拟,并与试验结果进行对比分析。结果表明:套筒连接试件搭接长度取10d时具有足够的锚固性能；套筒内部钢筋应变随距加载端距离的增加而迅速减小,并随外荷载的增加而增大；滚压螺旋肋套筒表面各位置应变均较小,套筒具有足够的安全冗余,靠近钢筋侧的轴向应变大于其他位置,且在套筒中部以轴向拉应变为主,套筒端部以环向拉应变为主；有限元模拟结果与试验结果吻合度较高,模型对于该实验具有一定的适用性。

Abstract:

In response to the demand for new, energy-efficient, and efficient construction methods, a spiral rib grouted sleeve made of seamless steel pipe processed by rolling process is proposed. This type of sleeve offers advantages of low cost, simple manufacturing, and easy construction. The spiral ribs produced by the rolling process significantly improve the mechanical interlocking force between the sleeve and the grout. Building upon the research on the performance of traditional grouted sleeve connections, a middle overlap sleeve connection form is introduced. Fourteen specimens of this type are fabricated using spiral-ribbed sleeves and subjected to uniaxial tensile tests to investigate their mechanical properties. Additionally, finite element simulations using ABAQUS are performed and the results are compared and analyzed in relation to the experimental findings. The findings indicate that the sleeve connections with a 10d overlap length exhibit sufficient anchoring performance. The strain in the internal steel reinforcement within the sleeve rapidly decreases with distance from the loading end and increases with external load. Surface strains on the spiral-ribbed sleeve are relatively small, indicating adequate safety redundancy. The axial strain near the steel reinforcement is higher, while the middle section experiences mainly axial tensile strain and the sleeve ends primarily undergo circumferential tensile strain. The finite element simulation results are in good agreement with experimental results, confirming their applicability.