无湿接缝装配式组合梁力学性能研究

Mechanical Properties of Prefabricated Composite Beams Without Wet Joints

【目的】为实现钢-混凝土组合梁的无湿接缝装配化,使组合梁结构易于拆卸和更换。【方法】采用ABAQUS有限元分析软件对高强螺栓连接钢-混凝土组合梁的力学性能进行研究,建立了准确可靠的有限元模型。在此基础上,改进了预制混凝土板无湿接缝的连接方式,并研究螺栓预紧力、拼接间隙对组合梁刚度与滑移的影响。【结果】组合梁抗弯刚度随预紧力的增大而提高,随拼接间隙的增加先降低后不变。对钢-混凝土交界面滑移过程进行了传力机理分析,阐明了增加预紧力提高组合梁刚度的原理,通过拟合与试验结果对比证明了所提出的改进方法对提高组合梁抗弯刚度的有效性与可行性。

【Purposes】This research is conducted to realize the assembly of steel-concrete composite beams without wet joints,so that the composite beam structure is easy to be disassembled and replaced.【Methods】ABAQUS analysis saftware was used to study the mechanical properties of high-strength bolted steel-concrete composite beams,an accurate and reliable finite element model was established,and the connection method of precast concrete slabs was improved.On this basis,the effects of bolt pre-tightening force,splicing gap,bolt diameter and strength on the stiffness and slip of the composite beam were studied.【Findings】The stiffness of the composite beam was improved with the increase of pre-tightening force,and decreased first and then remained unchanged with the increase of splicing gap.The mechanism of the sliding process of steel-concrete interface was analyzed,and the principle of increasing preload to improve the stiffness of the composite beam was clarified.The comparison between the fitting and the test results proves that the upgraded method proposed in this paper is effective and efficient in improving the stiffness and feasibility of the composite beam.