scholarly journals Experimental Study on Novel Energy-Dissipating Prefabricated Beam-Column Joints

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Qiong Liu ◽  
Shanghong Chen ◽  
Wei Lin ◽  
Fanjin Zeng
Keyword(s):  
Shear Failure ◽  
Structural Integrity ◽  
Plastic Hinge ◽  
High Strength ◽  
Internal Force ◽  
Steel Plates ◽  
Engineering Structures ◽  
Anchor System ◽  
Steel Bar ◽  
New Type

A new dapped-end beam to column connection is designed in this paper. Its assembly connection zone changes from inside the joint to midspan of the beam. The proposed connection can not only provide good structural integrity but also ensure that the plastic hinge moves away from the column edge. The rotational capacity of the plastic hinge determines the internal force redistribution of the joint and the energy dissipation capacity. The high-strength bolts and steel plates are used to realize connection, further enhancing the rotation of the plastic hinge and minimizing the cast-in-place concrete volume. Three full-scale exterior beam to column joints are casted and then subjected to reversal cyclic loading. The finite element (FE) analyses are carried out to compare with experimental results and study the effect of connection position on the structural behaviours. The obtained results show that the plastic hinges of all three specimens are firstly developed to a distance from the column edge, thus revealing that this kind of joint can achieve beam hinge mechanism and prevent joint shear failure. And the connection position is the most disadvantaged when coinciding with the plastic hinge zone, which would result in the excessive deformation and the early failure of the steel bar anchor system. The new type of joint shows good seismic performance during earthquake if the connection can be properly designed, and thus this kind of structural form can be applied to actual engineering structures in seismic regions.

INFLUENCE OF RECTANGULAR STEEL SPLICE-SLEEVE FOR PRECAST CONCRETE CONNECTION

2015 ◽  
Vol 77 (12) ◽  
Author(s):  
Ahmad Baharuddin Abd Rahman ◽  
Tan Kee Hong ◽  
Izni Syahrizal Ibrahim ◽  
Roslli Noor Mohamed
Keyword(s):  
Structural Integrity ◽  
Precast Concrete ◽  
Tensile Load ◽  
Steel Plates ◽  
Steel Bar ◽  
Tensile Performance ◽  
Bond Property ◽  
The Many ◽  
Steel Sleeve

Precast concrete building system has gained its popularity in Malaysia because of the many advantages such as high quality of structural components, less labour intensive at the construction site, and shorter completion time of a project. One of the constraints in precast concrete structures is to ensure that the connections are strong enough to ensure the structural integrity and robustness of the overall frames. In this study, a total of nine rectangular steel splice-sleeve connections were tested experimentally under incremental tensile loads. Two steel plates were inserted and welded to each end of the steel splice-sleeve. The steel plates act as shear key to provide the interlocking mechanism to the grout and to enhance the bond property between the grout and the splice. These plates were adopted to prevent the grout slippage from the sleeve. The grout strength, embedded steel bar lengths and the size of the steel sleeve splice were varied among the specimens to study their effect on the tensile performance of the connection. The results showed that the higher strength of grout, longer embedded length of steel bar and smaller size of the sleeve contributes to a higher ultimate tensile load.

scholarly journals Experimental Research on Seismic Performance of a New-Type of R/C Beam-Column Joints with End Plates

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Shufeng Li ◽  
Qingning Li ◽  
Haotian Jiang ◽  
Hao Zhang ◽  
Lizhong Zhang
Keyword(s):  
Seismic Performance ◽  
Plastic Hinge ◽  
High Strength ◽  
Frame Structure ◽  
Static Test ◽  
Hysteresis Curves ◽  
The Core ◽  
New Type ◽  
Plate Connections ◽  
Beam Plastic Hinge

This paper presents a new-type of fabricated beam-column connections with end plates. The joint details are as follows: the concrete beams are connected to column by end plates and six high strength long bolts passing through the core area. In addition, in order to increase the stiffness and shear strength, stirrups are replaced by the steel plate hoop in the core zone. To examine the fail behavior of the fabricated beam-column connection specimens, a quasi-static test is conducted for nine full-scale models to obtain the hysteresis curves, skeleton curves, ductility, energy dissipation capacity, and other seismic indicators. The experimental results show that all specimens failed in bending in a malleable way with a beam plastic hinge and the hysteresis curves are excellently plump for the end plate connections. From the seismic indexes, the fabricated connection specimens exhibit better seismic performance, which can provide reference for the application of prefabricated frame structure in the earthquake area.

Numerical Simulation Analysis on Seismic Behavior of a New Type Prefabricated Slab

2013 ◽  
Vol 639-640 ◽  
pp. 886-890 ◽  
Author(s):  
Qi Gao Hu ◽  
Wei Feng Cui ◽  
Jing Wei Gao ◽  
Jiang Yin
Keyword(s):  
Numerical Simulation ◽  
Seismic Behavior ◽  
Structural Integrity ◽  
Simulation Analysis ◽  
Masonry Structure ◽  
Masonry Structures ◽  
Transverse Joint ◽  
Steel Bar ◽  
New Type ◽  
Better Than

In previous earthquakes, masonry structures, especially those masonry structures with prefabricated slab was damaged severely, and caused heavy casualty and property losses. In order to improve the seismic behavior of prefabricated slab, a new type of prefabricated slab with longitudinal and transverse joint steel bar was designed. By employing a numerical simulation procedure, LS-DYNY3D, models were established, and their seismic behaviors were analyzed .The results show that, the masonry structure of new type prefabricated slab with longitudinal and transverse joint steel bar is better than the structure with traditional prefabricated slab in structural integrity and stability. That is to say, its seismic behavior is better than the masonry structure with traditional prefabricated slab.

The Effects of Filler Metal Transformation Temperature on Residual Stresses in a High Strength Steel Weld

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
J. A. Francis ◽  
H. J. Stone ◽  
S. Kundu ◽  
H. K. D. H. Bhadeshia ◽  
R. B. Rogge ◽  
...  
Keyword(s):  
Residual Stress ◽  
Transformation Temperature ◽  
Structural Integrity ◽  
Filler Metal ◽  
High Strength ◽  
Steel Plates ◽  
Stress Distributions ◽  
Steel Weld ◽  
Metal Arc Welding ◽  
Welding Consumables

Residual stress in the vicinity of a weld can have a large influence on structural integrity. Here the extent to which the martensite-start temperature of the weld filler metal can be adjusted to engineer the residual stress distribution in a bainitic-martensitic steel weld was investigated. Three single-pass groove welds were deposited by manual-metal-arc welding on 12 mm thick steel plates using filler metals designed to have different martensite-start temperatures. Their longitudinal, transverse, and normal residual stress distributions were then characterized across the weld cross section by neutron diffraction. It was found that tensile stresses along the welding direction can be reduced or even replaced with compressive stresses if the transformation temperature is lowered sufficiently. The results are interpreted in the context of designing better welding consumables.

The Application of Straw Concrete Wall Board in Constructional Engineering

2013 ◽  
Vol 438-439 ◽  
pp. 1607-1611
Author(s):  
Kun Qian ◽  
Tian Xia ◽  
Jie Zhang ◽  
Quan Yuan
Keyword(s):  
Engineering Application ◽  
Green Building ◽  
High Strength ◽  
Filling Material ◽  
Concrete Wall ◽  
Normal Concrete ◽  
Steel Bar ◽  
New Type ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

Constructional engineering was always faced with the threaten of earthquake and the problem of large energy consumption. As a new type of green building material, straw concrete has better ductility than normal concrete. In the straw concrete multi-ribbed slab structure, as the filling material of wall board, straw concrete improved the energy dissipation and deformability of wall board. When the load was applied, the filling blocks, grid frame and outer frame in straw concrete wall board work cooperatively, have good mechanical properties. The straw concrete wall board has advantages that light, high strength, energy conservation and seismic resistance. Considering the effect of different components in straw concrete wall board, this paper proposes the formula of vertical bearing capacity of straw concrete wall board to provide the basis for engineering application. The construction of straw concrete multi-ribbed slab structure include three processes that steel bar bind, blocks prefabrication and integral pouring, which fits for field fabrication in the building construction site.

Experimental Investigations of RC Frames Retrofitted by Steel Braced Frames Using a New Hybrid Connection

2011 ◽  
Vol 82 ◽  
pp. 594-599
Author(s):  
Misato Nishiyama ◽  
Pasha Javadi ◽  
Koki Maeda ◽  
Tetsuo Yamakawa
Keyword(s):  
Fundamental Mode ◽  
Shear Failure ◽  
High Strength ◽  
Steel Plates ◽  
Flexural Behavior ◽  
Experimental Investigations ◽  
Type I ◽  
Rc Frame ◽  
Type Ii ◽  
Direct Shear

In this paper, a new connection technique for installing steel braced frame inside an existing RC frame is proposed. The proposed connection, which is called “Hybrid Connection”, consists of high-strength grout, steel plates and high-strength bolts. In the current investigation, two fundamental modes, namely, Type I and Type II are experimentally verified. In the fundamental mode of Type I, the steel braces buckle and stretch, and the RC frame and the steel frame exhibit flexural behavior. In the fundamental mode of Type II, direct-shear failure happens in the hybrid connection at the beam connection, and punching (direct-shear) failure occurs at the top of RC columns.

scholarly journals Restoring Force Model For A New Type of Bolted Prefabricated Beam-To-Column Joint

2021 ◽  
Author(s):  
Jiang Haotian ◽  
Miao Hailin ◽  
Jin Chenhua ◽  
LI Qingning ◽  
Yan Lei
Keyword(s):  
High Strength ◽  
Steel Plates ◽  
Hysteresis Curve ◽  
Force Model ◽  
Backbone Curve ◽  
Restoring Force ◽  
Panel Zone ◽  
Restoring Force Model ◽  
New Type ◽  
Column Joint

Abstract The wet prefabricated beam-to-column joint (PBCJ) has a densely reinforced panel zone and is difficult to construct, leading to poor connection reliability. To address this problem, we propose a dry PBCJ, where the concrete column is encased with steel plates at the connection and the beams and the column are connected by high-strength bolts. The method for constructing the joint is described herein. A total of six full-scale PBCJs were designed and subjected to quasi-static loading tests with different stirrup ratios, reinforcement strengths, and joint strengthening methods. Based on the test loading process, the joint failure mode is summarised, and a trilinear backbone curve model is proposed. According to the characteristics of the hysteresis curve and the backbone curve, the stiffness degradation law and hysteresis rule are analysed; then, the restoring force model for the new type of PBCJ is established, and the model results are compared with the test results. The data show that the new bolted PBCJ undergoes the cracking, yielding, ultimate, and failure stages; the trilinear backbone curve, which is composed of an elastic section, an elastoplastic section, and a plastic section, well describes the load-carrying characteristics of the joint. The backbone curve calculated by the established restoring force model is consistent with that obtained from the tests, indicating that the model can accurately describe the energy dissipation performance of the new PBCJ and thus provide a theoretical basis for the seismic performance analysis of this type of joint.

scholarly journals Internal Force on and Deformation of Steel Assembled Supporting Structure of Foundation Pit under Thermal Stress

2021 ◽  
Vol 11 (5) ◽  
pp. 2225
Author(s):  
Fu Wang ◽  
Guijun Shi ◽  
Wenbo Zhai ◽  
Bin Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
High Strength ◽  
Element Model ◽  
Internal Force ◽  
Foundation Pit ◽  
Dimensional Finite Element ◽  
Influence Of Temperature On ◽  
Scale Experiment ◽  
Three Dimensional Finite Element

The steel assembled support structure of a foundation pit can be assembled easily with high strength and recycling value. Steel’s performance is significantly affected by the surrounding temperature due to its temperature sensitivity. Here, a full-scale experiment was conducted to study the influence of temperature on the internal force and deformation of supporting structures, and a three-dimensional finite element model was established for comparative analysis. The test results showed that under the temperature effect, the deformation of the central retaining pile was composed of rigid rotation and flexural deformation, while the adjacent pile of central retaining pile only experienced flexural deformation. The stress on the retaining pile crown changed little, while more stress accumulated at the bottom. Compared with the crown beam and waist beam 2, the stress on waist beam 1 was significantly affected by the temperature and increased by about 0.70 MPa/°C. Meanwhile, the stress of the rigid panel was greatly affected by the temperature, increasing 78% and 82% when the temperature increased by 15 °C on rigid panel 1 and rigid panel 2, respectively. The comparative simulation results indicated that the bending moment and shear strength of pile 1 were markedly affected by the temperature, but pile 2 and pile 3 were basically stable. Lastly, as the temperature varied, waist beam 2 had the largest change in the deflection, followed by waist beam 1; the crown beam experienced the smallest change in the deflection.

scholarly journals Impact resistance of steel materials to ballistic ejecta and shelter development using steel deck plates

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Hiroyuki Yamada ◽  
Kohei Tateyama ◽  
Shino Naruke ◽  
Hisashi Sasaki ◽  
Shinichi Torigata ◽  
...  
Keyword(s):  
Impact Energy ◽  
Impact Test ◽  
Impact Resistance ◽  
Protective Layer ◽  
High Strength ◽  
Steel Plates ◽  
Corrugated Plates ◽  
Shelter Construction ◽  
The Impact ◽  
Ballistic Ejecta

AbstractThe destruction caused by ballistic ejecta from the phreatic eruptions of Mt. Ontake in 2014 and Mt. Kusatsu-Shirane (Mt. Moto-Shirane) in 2018 in Japan, which resulted in numerous casualties, highlighted the need for better evacuation facilities. In response, some mountain huts were reinforced with aramid fabric to convert them into shelters. However, a number of decisions must be made when working to increase the number of shelters, which depend on the location where they are to be built. In this study, we propose a method of using high-strength steel to reinforce wooden buildings for use as shelters. More specifically, assuming that ballistic ejecta has an impact energy of 9 kJ or more, as in previous studies, we developed a method that utilizes SUS304 and SS400 unprocessed steel plates based on existing impact test data. We found that SUS304 is particularly suitable for use as a reinforcing material because it has excellent impact energy absorption characteristics due to its high ductility as well as excellent corrosion resistance. With the aim of increasing the structural strength of steel shelters, we also conducted an impact test on a shelter fabricated from SS400 deck plates (i.e., steel with improved flexural strength provided by work-hardened trapezoidal corrugated plates). The results show that the shelter could withstand impact with an energy of 13.5 kJ (2.66 kg of simulated ballistic ejecta at 101 m/s on impact). In addition, from the result of the impact test using the roof-simulating structure, it was confirmed the impact absorption energy is further increased when artificial pumice as an additional protective layer is installed on this structure. Observations of the shelter after the impact test show that there is still some allowance for deformation caused by projectile impact, which means that the proposed steel shelter holds promise, not only structurally, but also from the aspects of transportation and assembly. Hence, the usefulness of shelters that use steel was shown experimentally. However, shelter construction should be suitable for the target environment.

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