焊钉连接件抗拉承载力试验

发布时间：2018-06-14 11:39

本文选题：组合结构桥梁 + 焊钉连接件　；参考：《同济大学学报(自然科学版)》2015年09期

【摘要】：为建立组合结构桥梁常用焊钉连接件的抗拉承载力计算方法,进行了高度分别为100、200、300和400mm的焊钉连接件抗拉承载性能模型试验,比较分析了高度对破坏模态、承载力和峰值分离的影响;基于国内外93个模型试验结果,比较分析了ACI 318-08、PCI 5th和CEB-ECCS等标准所建议抗拉承载力计算式与试验结果的吻合度;给出了防止焊钉拔出、边缘混凝土压裂和混凝土掀起等脆性破坏的限制条件;结合脆性破坏限制条件和延性破坏抗拉承载力计算式提出了焊钉连接件延性破坏抗拉承载力计算方法.研究结果表明:焊钉受拉延性破坏时的承载力和峰值分离约为脆性破坏时的1.5和5.8倍;ACI 318-08所建议计算式与试验结果吻合度较高;分别采用混凝土强度等级、焊钉缘端距离及焊钉高径比作为限制条件,能够防止焊钉受拉时发生脆性破坏;提出的焊钉连接件延性破坏抗拉承载力计算方法,可为焊钉连接件的延性设计提供参考.
[Abstract]:In order to establish the calculation method of tensile bearing capacity of welded nail connectors commonly used in composite structure bridges, the tensile bearing capacity model tests of welded nail connectors with heights of 100200300 and 400mm are carried out, and the failure modes of welded nail joints with height of 100200300 and 400mm are compared and analyzed. Based on the results of 93 model tests at home and abroad, the calculation formula of tensile capacity suggested by ACI318-08 PCI 5th and CEB-ECCS is compared with the test results. The limit conditions of brittle failure such as fracturing of edge concrete and uplift of concrete, and the calculation method of ductile failure tensile capacity of welded nail joint are put forward in combination with the limit condition of brittle failure and the formula for calculating tensile bearing capacity of ductile damage. The results show that the strength and peak value separation of welded nail under tensile ductility failure is about 1.5 and 5.8 times as high as that of brittle failure, and the calculation formula proposed by ACI 318-08 is in good agreement with the test results, and the concrete strength grade is used respectively. As the limiting condition, the distance between the ends of the welding nail and the ratio of the weld nail height to the diameter can prevent the brittle failure of the welded nail when it is pulled, and the proposed calculation method of the ductility failure tensile bearing capacity of the welded nail joint can provide a reference for the ductility design of the welded nail joint.
【作者单位】：同济大学土木工程学院;
【分类号】：U441

【共引文献】