螺栓组布局对连接结构承载能力和剪切刚度的影响

螺栓连接广泛运用于航空航天与机械工程等领域，其承载能力与剪切刚度是衡量连接可靠性的重要指标。以单搭接螺栓组连接板为研究对象，从分析螺栓连接板的剪切失效过程出发，建立螺栓连接板的等效剪切刚度模型，应用静力拉伸实验测试螺栓连接板的位移载荷响应曲线，讨论螺栓组布局对承载能力和刚度的影响。结果表明：螺栓组布局角度对连接板的承载能力和剪切刚度有一定的影响，布局角度从0°增加到45°时承载能力和刚度逐渐减小，布局角度从45°增加到75°时承载能力和刚度逐渐增大；螺栓组布局角为0°时，连接板承载能力与等效剪切刚度最大，而布局角为45°时最小；不同布局角下连接板的承载能力最大约相差11.05%，等效剪切刚度最大约相差12.02%。

Impacts of Bolt Layout on Loading Capacity and Shearing Stiffness of Connected Structures

Bolt group is widely used in the field of aerospace and mechanical engineering,and its loading capacity and shearing stiffness is the important indicator to reflect the safe reliability of connected structures.Taking a single lapped and bolt group jointed plate as the study object,the shearing failure analysis of bolted joint plate was carried out,and the equivalent shear stiffness model of bolted joint plate was established.The displacement loading response curves of bolted joint plate was obtained by static tensile experiment,and the impacts of bolt layout on loading capacity and stiffness were discussed.Results indicate that the bolt layout angle plays role on the loading capacity and shearing stiffness to some extent.The loading capacity and shearing stiffness gradually decrease as the bolt group layout angle increases from 0° to 45°,But they gradually increase as the bolt group layout angle increases from 45° to 75°.When the bolt group layout angle is 0°,the loading capacity and the shearing stiffness are the maximum,while they are the minimum when the layout angle is 45°.Under different layout angle,the maximum difference of loading capacity of the bolt jointed plate is about 11.05%,the maximum difference of shearing stiffness is about 12.02%.