Abstract
The paper presents experimental studies of an asymmetric multi-bolted connection at the preloading state. Design assumptions and structure of a stand for testing forces in bolts in a multi-bolted connection were introduced. The tightening process was conducted with a wrench, monitoring the values of the forces in the bolts using a calibrated measuring system based on resistance strain gauges. The measurement data was processed using the Matlab R2018b Simulink program. Two methods of bolt tightening were tested: in one pass (in which the bolts were tightened in a specific sequence and each bolt was tightened immediately to the full preload value) and in several passes (in which the bolts were also tightened sequentially but the full preload value was applied to the bolts in three tightening cycles). The influence of the method and sequence of bolt tightening on the distribution of force values in bolts during and at the end of the preloading state was investigated. The results were statistically processed and summarized in the form of diagrams showing the distributions of normalized force values in the bolts for all the considered tightening cases. The tests were carried out for the selected connection and an assembly method was proposed which would make it possible to achieve the most even distribution of the force values in the bolts at its end, and thus before the connection exploitation state.
Highlights
Multi-bolted connections used as nodes in engineering structures are critical components of many complex systems that play a key role in their integrity and stability
2) The variability of the bolt forces value during the assembly depends on the bolt tightening sequence
3) The greatest decrease in force in a given bolt occurs after tightening the bolt located in the immediate vicinity
Summary
Multi-bolted connections used as nodes in engineering structures are critical components of many complex systems that play a key role in their integrity and stability. There is a long-term loss of preloading in the bolts [12] Taking all these phenomena into account, in many cases, precise tightening of the connection is required in order to obtain the appropriate (sometimes normalized) level of the bolt forces. The conducted review shows that currently there are many methods of monitoring bolt forces and detecting loosening in bolted connections. Experimental studies of the tightening process of multi-bolted connections have been carried out mainly for connections showing geometric symmetry. The research described in this paper will be used to verify the modeling method of the tightening process of arbitrary multi-bolted connections presented in [43], [44]
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