Papers by Keyword: Joint

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Authors: Jian Guo Cai, Jian Feng, Hong Jin Zhu, Ya Fei Liu, Li Feng Huang
Abstract: An experimental investigation was undertaken into the seismic performance of a precast prestressed concrete frame system. A total of three beam-to-column connection models were designed, built, and tested to failure to evaluate their strength and ductility properties under cyclic loading. The comparative study showed that the hysteretic loops were full and the joints had better energy dissipation capacity. It was concluded that satisfactory seismic performance could be expected from this frame system if the slip of the U-shaped reinforcing steel bar was controlled well on the zone of joint. Then the finite element method (FEM) was used to analyze the specimen and the calculation results were in good agreement with those of the test.
Authors: Jing Feng Wang, Xin Yi Chen, He Tao Hou
Abstract: This paper discusses results of experiments on blind bolted end plate joints to concrete-filled thin-walled steel tubular (CFTST) columns. Four exterior joints to CFTST columns subjected to cyclic loadings. A feature of this novel joint is the use of the blind bolts and extensions to these bolts into the concrete-filled square steel tubular column. Failure modes, moment-rotation hysteretic curves and energy consumption of the connections were analyzed. Further, the connection rigidity and ductility were also elevated by present specifications. The test results showed that the end plate type and the steel tube thickness affect the seismic behaviour of the typed blind bolted end plate joints. The proposed joint has reasonable strength, stiffness and ductility by taking reasonable end plate type, steel tube thickness and blind bolt anchorage; its ultimate connection rotation satisfies the ductility design requirements, and could be reliably and safety used in low-layer or multi-layer composite frames.
Authors: Xian Guo Ye, Kai Nan Yang, Xun Chong, Qing Jiang
Abstract: Mechanical properties of joint between superimposed slabs have a remarkable effect on the bending performance of the whole slab. To study the bending performance of superimposed slabs with different forms of joint, six superimposed slabs were designed and produced. Based on the static loading experiment, load was concentrated on two three-equal-division points, bearing capacity, deformation, cracks of specimens were obtained. Whether there were lattice steel bars in the precast slab or not and different reinforcement in the joint were considered to study the bending performance. The test results show that the failure mode of slab without lattice steel bars is brittle while others are ductile. Lattice steel bars can control the development of cracks along the superposed surface, increasing the shear capacity and improving the ductility of specimens. The bearing capacity of the whole superimposed slab depends on the joint cross section. The joint would not generate a difference to the deflection curves in service condition. When reinforcement in the joint is strengthened, failure modes of slabs will be effectively improved.
Authors: Xian Chao Zheng, Qing Ning Li, Shu Bin Pan, Wei Shan Jiang
Abstract: The assembled monolithic compound spiral reinforced concrete column in this paper is a kind of concrete column reinforced by high-strength compound spiral stirrups and jointed by local steel tubular and bolt reinforcement. Experiments of four specimens under low cyclic loading and different axial compressive loads are carried out, and the result testifies that the anti-seismic property of these measures is not worse than the integral compound spiral hoop columns under the same load.
Authors: Yi Sheng Su, Shu Fang Zheng, Qi Liang Li, Jin Yun Quan
Abstract: In order to study the mechanical behavior of joints in the castellated portal frame of light-weight steel under static loads, a static loads experiment has been performed for these new joints in this paper. The experiment members include four castellated joints and one solid-web joint of original steel, considering three vary parameters which are connection form of joints, joint region with setting stiffener and the distance from the center of hole to joint region. Experiment shows: the stiffness of castellated joints is higher than the one of solid-web joint. The parameters have a great influence on the mechanical behavior of joints, except the connection form of joints.
Authors: Simon Hehl, Till Vallée, Yu Bai
Abstract: Adhesively bonded connections involving pultruded FRP typically fail in a brittle manner, making their analysis a case study for the application of statistical size effects. For brittle materials, in which failure is often caused by a single critical defect, statistically based size effects on strength are adequately explained by probabilistic theories such as the Weibull strength theory. A previously implemented probabilistic dimensioning method for adhesively bonded balanced joints is extended to a complex joint involving a tube and a lamella, both made of pultruded FRP. Instead of the previously used 2d approach the extension requires a 3d formulation. The entire joint is idealized as being constituted by n elements; its survival depends on the simultaneous survival of all elements. By the means of a 3d FEA, failure triggering stress components in all n elements were determined; a probability of failure is associated to each element using the corresponding combination stresses combined into an appropriate failure criterion, hence defining a theoretical joint strength.
Authors: Zhen Qing Wang, Song Zhou, Jian Sheng Zhou, Xiao Di Wu
Abstract: In this paper, the influence of geometrical parameters on failure load of bolted single-lap composite joint was investigated. The composite laminate was manufactured from HTA/6376, a high-strength carbon fiber–epoxy material currently used in primary structures in the European aircraft industry. Two geometrical parameters which were plate width-to-hole diameter ratio (W/D), and the edge-to-hole diameter ratio (E/D) were analyzed. To avoid modeling each ply of the laminates discretely, the laminates were modeled using equivalent linear elastic properties. the failure analysis was modeled by Extend Finite Element Method (XFEM) in ABAQUS. Maximum principal stress criterion (Maxps) was used to determine the failure load.
Authors: Zhi Xiang Xu
Abstract: Multi-bolt composite joints are widely used in the primary structures because of their advantages of high reliability, load carrying capability, and maintainability. Load distribution analyses, as the precondition of strength analysis and design of multi-bolt composite joints, have attracted extensive attention over decades. The conventional 2D FEM, new 2D FEM and 3D FEM were established to analyze the load distribution of a typical single-lap three-bolt composite joint. The effect of friction on the load distribution results of 3D FEM was investigated. Furthermore, the load distribution of the joint was examined by using a theoretical spring model and load distribution experiments. Based on the investigation of experimental and numerical results, the load distribution character of single-lap three-bolt composite joint was obtained, and the suitability of different FE models was verified.
Authors: Francisco Sena Cardoso, Kim J.R. Rasmussen
Abstract: This paper concerns storage rack frames and describes a study that led to the development of an FE model sufficiently accurate and simultaneously simple to be adopted by professional engineers. The presented FE model pays particular attention to storage rack frames susceptible to local/distortional buckling and down-aisle sway buckling. The influence of several strength parameters is also assessed with a special focus on the moment-rotation curve of the semi-rigid joints, including the detailed connection between members discretised into shell elements, and the modelling of perforations.
Authors: Iuliana Piscan, Nicolae Predincea, Nicolae Pop
Abstract: The present study demonstrates the use of optimization technology in improving the bolted joint design. Design exploration from ANSYS Workbench is used in the study. The objective of the study was to minimize the bolted joint deformation in order to optimize the joint. Variations of the parameters such as bolt pretension force, friction coefficient and pressure were studied. The optimization study provided response charts of the different design variables on the output. Sensitivity analysis of the input variables helped in identifying the importance of each design variable and their respective effects on the output. Finally the different design points were rated based on a goal-driven optimization study and the best design is chosen. Single Graphical User Interface allowed quick learning and ease-of-use.
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