为适应装配式组合梁的发展，研发一种新型不锈钢可拆卸螺栓连接件，并对其疲劳荷载作用下的力学性能退化规律开展研究。首先，通过文献和市场调研，充分考虑现有螺栓的优缺点，设计制作一种新型不锈钢可拆卸螺栓连接件用于装配式组合梁；其次，制作6组新型螺栓连接件的推出试件，进行静载和疲劳试验，对比静载与不同疲劳加载次数后试件的破坏形态，重点分析新型螺栓连接件在疲劳加载过程中剩余承载力、残余滑移量、抗剪刚度及延性系数的退化规律；最后，基于疲劳累积损伤理论和材料剩余强度模型，确定新型螺栓连接件在疲劳加载过程中的损伤度，进而建立新型螺栓连接件的剩余承载力计算模型。结果表明：新型螺栓连接件在静力和疲劳作用下呈现不同的变形及断面破坏特征；在疲劳荷载作用下，新型螺栓连接件的各项力学性能均呈现不可逆的退化，在本次试验中试件在疲劳加载270万次后剩余承载力退化12.1%，延性系数退化67.6%，抗剪刚度退化12.9%，退化较为明显；本文建立的新型螺栓连接件剩余承载力计算模型计算结果与试验值吻合良好。
Abstract
To adapt to the development of prefabricated composite beam, a new stainless steel removable bolt connector was developed, and the mechanical performance degradation law under fatigue load was studied. First of all, Through the literature and market research, fully considering of the advantages and disadvantages of the existing bolts, a new stainless steel removable bolt connector for prefabricated composite beam was designed and produced; Secondly, six sets of push-out tests with new bolt connections were conducted for static and fatigue tests. Comparing the failure mode of specimens after static load and fatigue load with different cycle times, the residual bearing capacity, residual slip amount, shear stiffness and ductility coefficient of the new bolt connections during fatigue load were analyzed; Finally, based on the fatigue accumulation damage theory and the material residual strength model, the damage degree of the new bolt connector during fatigue loading was determined, the calculation model of bolt bearing capacity was established. The results show that the new bolt connector has different deformation and failure characteristics of section under static and fatigue loads; the mechanical properties of the new bolt connector show irreversible degradation after fatigue load. In this test, after 2.7 million fatigue loadings, the residual bearing capacity of specimens deteriorates by 12.1%, ductility coefficient deteriorates by 67.6%, shear rigidity deteriorates by 12.9%, and the degradation is obvious. The calculation result of the proposed residual bearing capacity of bolt connectors shows good agreement with the test value.
关键词
不锈钢螺栓连接件 /
推出试验 /
疲劳损伤 /
剩余强度 /
剩余力学性能
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Key words
Stainless steel bolt connector /
push-out test /
fatigue damage /
residual strength /
residual mechanical properties
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