Αρχεία: Bolted Connections for RHS/SHS under tensile
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Bolted Connections for RHS/SHS under tensile
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SUMMARY
The static strength of bolted, spliced connections for rectangular hollow sections under tensile loading is the topic of the presented study. A very common spliced connection type, the bolted flange-plate connection as well as a more recent connection type, the hidden joint connection have been studied. For clarity of presentation, the presented thesis has therefore been divided into two parts:
- Part I: Bolted flange-plate connections;
- Part II: Hidden joint connections.
Prying forces are the main concern with bolted flange-plate connections. Prying forces occur if the flange-plates lever against each other due to deformations of the plates under tensile loading. Depending on the bolt layout and flange-plate thickness, these prying forces can differ very significantly. Additionally, the formation of a complete yield line mechanism can also result in the collapse of connections with flexible flange-plates and strong bolts. Within the framework of the presented work, an experimental investigation with square and rectangular hollow sections has been carried out. State-of-the-art equipment has been used to record the load in the bolts. The subsequent non-linear Finite Element analyses (using 3D solids as well as contact elements), verified by the results of the experimental investigations, extended the database. A parallel analytical study, inter alia using yield line analysis, served as the basis for the derivation of specific design rules.
Part II of the presented thesis deals with so-called hidden joint connections, which are a modification of the more typical gusset plate connection with slotted hollow sections. In contrast to the more common gusset plate connections where the gusset plate protrudes beyond the width of the slotted member, the gusset plate of the hidden joint connection is fitted into the inside width of the unslotted hollow section. The aim of this research has been the derivation of a design model for shear lag failure, in particular the rupture of the hollow section due to shear lag. A limited number of tensile tests on hidden joint connections for square hollow sections has been carried out. Technical feasibility of welding inside the hollow section has been of special interest. The tests have been used to verify the numerical investigation, which again has been used as a basis for a new calculation method for shear lag failure of the hollow section.
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