This paper presents a mixed finite element model for the nonlinear time-dependant analysis of composite beams with partial shear connection. The key idea is to consider, as a first approach, a viscoelastic/plastic model for the concrete slab in order to simulate the interaction between the time effects of concrete, such as creep and shrinkage, and the concrete cracking. Creep is taken into acco...

This paper presents a novel bolt-loosening detection technique using image information of bolted joints in steel bridges. Firstly, existing bolt-loosening detection techniques are reviewed and their benefits and limitations are analyzed. Secondly, a bolt-loosening detection algorithm using image processing techniques is newly proposed for bolted joints in steel bridges. It consists of 3 steps: ...

In this paper, five sets of multi-bolted joint shear tests are designed to study the effect bolt middle distance on bearing performance joints, and analyze failure modes specimens. The main conclusions as follows: For M10 bolts (grade 8.8) bamboo curtain plywood connections. When spacing increases 50mm, ultimate capacity nodes tends be stable; initial stiffness joint, has no obvious joint. Howe...

This paper presents experimental investigations carried out on various composite floor deck panel systems. The effects of parameters such as concrete shear length, steel thickness, and thickness the flexural behavior panels were examined. Shear tests identical specimens with four different span lengths. Four-point single-span double-span specimens. stress-slip, load-deformation, moment-curvatur...

In this paper, we report our findings on implementing a synthetic phased array surface acoustic wave sensor to quantify bolt tension. Maintaining proper bolt tension is important in many fields such as for ensuring safe operation of civil infrastructures. Significant advantages of this relatively simple methodology is its capability to assess bolt tension without any contact with the bolt, thus...

Phased arrays can be used for detecting cracking (and other defects) in high tensile bolts. The technique uses a “fingerprinting” approach to the bolts. In contrast to current code procedures where an operator manually scans a normal beam probe over a bolt and interprets the results, this phased array technique uses an S-scan and a mechanized scanner. Specifically, the phased array probe is mou...

In this research, the influence of bolt preload on the fatigue strength of 2024-T3 aluminium alloy double lap bolted joints has been studied experimentally and numerically. To do so, three sets of the specimens were prepared and each of them subjected to tightening torque of 1,2.5 and 5 N-m and then fatigue tests were conducted under various cyclic axial load levels. In the numerical method, th...

To develop a new brace connector, static incremental analysis of braced shear wall with detailed model was conducted. Several kinds load-displacement relationships, that are necessary for the model, were defined based on elemental tests, such as tensile tests and screws. The stiffness from higher than one loading test, while maximum strength column high density near test.