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.

Analysis on the Seismic Behavior of Extended End-Plate Connections of Steel Frame Structure

2012 ◽  
Vol 193-194 ◽  
pp. 1405-1413 ◽  
Author(s):  
Zhu Ling Yan ◽  
Bao Long Cui ◽  
Ke Zhang
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Frame Structure ◽  
End Plate ◽  
Rigid Connection ◽  
Extended End Plate ◽  
Plate Connections ◽  
Steel Frame Structure

This paper conducts analysis on beam-column extended end-plate semi-rigid connection joint concerning monotonic loading and cyclic loading of finite element through ANSYS program, mainly discussed the influence of parameters such as the form of end plate stiffening rib on anti-seismic performance of joint.

Crack Pattern and Ductility of Steel Reinforced Ultra High Strength Concrete Composite Joint Subjected to Reversal Cycle Load

2009 ◽  
Vol 417-418 ◽  
pp. 845-848 ◽  
Author(s):  
Chang Wang Yan ◽  
Jin Qing Jia ◽  
Ju Zhang
Keyword(s):  
High Strength Concrete ◽  
Plastic Hinge ◽  
Engineering Application ◽  
Load Ratio ◽  
High Strength ◽  
Strength Concrete ◽  
Weak Beam ◽  
Composite Joint ◽  
And Performance ◽  
Beam Plastic Hinge

In order to investigate the seismic damage and performance of steel reinforced ultra high strength concrete composite joint subjected to reversal cycle load, six interior strong-column-weak-beam joint specimens were tested with various axial load ratio and volumetric stirrup ratio. A discussion on the crack mode and ductility was presented. It was found that all joint specimens failed in bending with a beam plastic hinge in a ductile manner, with crack propagation different from the weak-column-strong-beam joint. The experimental results indicated that test parameters of the steel reinforced ultra high strength concrete composite joint with good seismic performance may be referred for engineering application.

Strain Analysis of Composite Frame Joints with Double Side Penetrated Diaphragms

2012 ◽  
Vol 166-169 ◽  
pp. 3277-3281
Author(s):  
Min Tong
Keyword(s):  
Stress Distribution ◽  
Strain Analysis ◽  
Steel Tube ◽  
Core Region ◽  
Steel Beam ◽  
Static Test ◽  
The Core ◽  
Composite Frame ◽  
Joint Connection ◽  
New Type

Abstract. Connection joint with penetrated diaphragm, which is better for the stressing state of the welding connection, is a new type joint for the beam and column connection. Static test and pseudo-static test are put to 17 crossing joints. The stress distribution of the steel beam and the penetrated diaphragm are discussed. The experiment shows that the penetrated diaphragm transfer most tension force of the steel beam’s upper flange to the core region of the joint, which could effectively decrease the stress and strain gradient within the connection area of the steel beam’s upper flange and steel tube column. As the result, the shear force of the core region is decreased. The front weld is avoided being surfing great tension. The ductility of the joint and the energy dissipation capacity of the structure are then increased. The type and the size of the penetrated diaphragm show great affection to the stress distribution of steel beam and penetrated diaphragm. The study achievement enriches the joint connection type of the composite structure with concrete- filled steel tube.

scholarly journals Research on High-strength Flexible Insulation Rod of Ultra High Voltage Live Working

2021 ◽  
Vol 248 ◽  
pp. 01054
Author(s):  
Zhigang Wang ◽  
Yun Xiang ◽  
Ziqi Yi ◽  
Longfei He ◽  
Mingjie Chen ◽  
...  
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Large Deflection ◽  
High Strength ◽  
Heavy Weight ◽  
Existing Problems ◽  
The Core ◽  
New Type ◽  
Protective Cover ◽  
Core Rod

Insulation pull rods are commonly used tools and instruments in the replacement of insulators for live work. Traditional hard insulated pull rods are difficult to transport and assemble due to their large deflection, especially due to the long and heavy weight of insulated pull rods used in UHV live operations, the difficulties in the above links are more obvious. In view of the existing problems in the use of the existing insulated pull rods, by studying the overall processing type, the soft pull rod weaving process, the technology of tightly combining the core rod and the protective cover, the technology of connecting the core rod and the metal, etc., a new type suitable for live transmission lines has been developed. Large-tonnage soft insulated pull rod for operation. Effectively solve a series of problems caused by the large deflection of the hard insulated pull rod.

Crack Pattern and Ductility of Connections Composed of CSSEUHSC Columns and SEC Beams under Cycle Loads

2011 ◽  
Vol 50-51 ◽  
pp. 396-399
Author(s):  
Chang Wang Yan ◽  
Ju Zhang ◽  
Jin Qing Jia
Keyword(s):  
Crack Resistance ◽  
High Strength Concrete ◽  
Plastic Hinge ◽  
Engineering Application ◽  
High Strength ◽  
Crack Pattern ◽  
Core Region ◽  
Test Parameters ◽  
Beam Plastic Hinge ◽  
Resistance Performance

In order to investigate the crack pattern and ductility of connection composed of cross shaped steel encased ultra high strength concrete (CSSEUHSC) columns and steel encased concrete (SEC) beams under cycle loads, six interior connection specimens were tested in the laboratory. It was found that cracks appeared in the connection core regions and at the beam end for all specimens, and all the connections behaved in a ductile manner and failed in bending with a beam plastic hinge and shearing in the connection core region. The experimental results indicated that test parameters of connection composed of CSSEUHSC columns and SEC beams with good crack resistance performance may be referred for engineering application.

Analysis of Aseismic Mechanism of Wooden Architecture of Ancient Chinese

2014 ◽  
Vol 889-890 ◽  
pp. 1417-1420
Author(s):  
Zhao Ru Guo ◽  
Zi Feng Yang
Keyword(s):  
Seismic Performance ◽  
High Strength ◽  
Frame Structure ◽  
Seismic Capacity ◽  
Earthquake Disaster ◽  
Good Design ◽  
Wooden Frame

The concept of ancient tiled structure is the basic condition of our traditional building with good seismic performance ; wooden frame structure with rigid and flexible dual characteristics is lightweight, high strength ductile frame structure , this architecture is to tenon use leading technologies to form a series of structural wood architecture seismic important technical defense to tenon technology form the basis for the brackets is a key component parts of ancient buildings earthquake disaster . In addition , bases and roofs of ancient buildings of good design is important to form an auxiliary seismic capacity .

Study on Failure Mechanism of Reinforced Concrete Frame with Construction Joint

2013 ◽  
Vol 351-352 ◽  
pp. 434-437
Author(s):  
Xi Kang Yan ◽  
Kang Ma ◽  
Su Duan Wang ◽  
Qian Qian Chen ◽  
Xiao Lei Hou ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Fracture Morphology ◽  
Processing Method ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Static Test ◽  
Concrete Frame ◽  
Construction Joint ◽  
Fracture Crack

According to the quasi static test of reinforced concrete frame with construction joints in, the fracture crack sequence, fracture morphology and plastic hinge are studied in detail. Research shows that two kinds processing method of construction joint will not affect the destruction form of a frame structure, but destruction order .

Experimental Study on Seismic Performance of New Type of RC Core Walls

2011 ◽  
Vol 243-249 ◽  
pp. 3730-3736
Author(s):  
Xuan Ming Huang ◽  
Jing Zhang
Keyword(s):  
Experimental Study ◽  
Seismic Performance ◽  
Lateral Force ◽  
High Rise ◽  
The Core ◽  
Normal Core ◽  
New Type ◽  
Low Cyclic Loading ◽  
Concealed Bracings ◽  
Main Component

In high-rise concrete structures, the elevator or stairs which located in the middle of the building are always put into the RC core walls. It not only meets the requirements of the function of usage, but also makes the core walls bear most of the lateral force and becomes the main component in the whole structure that resists the lateral force. Therefore, the seismic performance of RC core walls is of great concern to engineering. At present, there is little experimental study on measures of improving the seismic performance of RC core walls. In this paper, firstly, a new type of construction measure is put forward to improve its seismic performance. Secondly, through the experimental study on one 1/6 scale core walls with concealed bracings and one 1/6 scale normal core walls under the low cyclic loading, the effect of concealed bracings on bearing capacity, stiffness, ductility, hysteresis, failure phenomena and energy dissipation of concealed bracings are discussed. The experiment shows that the seismic performance of RC core walls with concealed bracings is improved remarkably.

Development of Passive Controlled Structure Assembled With L-Type Diaphragm

2008 ◽  
Author(s):  
Tadashi Mikoshiba ◽  
Chikahiro Minowa ◽  
Masakazu Terai ◽  
Yujiro Hiyama ◽  
Takanori Sato ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Shaking Table Test ◽  
Stress Transfer ◽  
High Strength ◽  
Shaking Table ◽  
Frame Structure ◽  
Absorption Mechanism ◽  
New Type ◽  
Column Joint ◽  
Controlled Structure

Using the high-strength bolted connection, it is possible to control the quality of the joint and improve the construction of the structure. By setting the energy absorption mechanism on the structure and enhancing the damping effect, it makes it possible to scale back the influence of the earthquake. Based on the statement above, a new type of beam column joint (L-type Diaphragm) was developed and tests and analysis were conducted to validate the performance of this joint and the energy absorption characteristics at the end of the beam were surveyed. The stress transfer mechanism of the joint was investigated in the shaking table test of the actual size frame structure with this joint. As a result, it was found effective and a higher reliability.

scholarly journals Feasibility Study of Using Engineered Cementitious Composite and High-Strength Bars in Rigid Bridge Piers Based on Seismic Vulnerability Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jie Li ◽  
Yuanhong Hu ◽  
Dayu Yang ◽  
Tengda Feng ◽  
Yan Liang ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Plastic Hinge ◽  
High Strength ◽  
Vulnerability Analysis ◽  
Bridge Piers ◽  
Main Function ◽  
Cementitious Composite ◽  
Engineered Cementitious Composite ◽  
Seismic Vulnerability Analysis

The main function of pier is to transmit the load from superstructure to foundation reliably. Under earthquake action, the main failure reason of bridge is the damage of bridge pier. The application of some high-performance materials is helpful to improve the seismic performance of bridge piers. Based on seismic vulnerability analysis, this paper studies the feasibility of using engineered cementitious composite (ECC) and high-strength bars in bridge piers. Taking a rigid pier as an example, a nonlinear numerical model is established by OpenSees software. The reasonable replacement height of ECC in plastic hinge regions, stirrup ratio of pier section, and replacement rate of high-strength bars are obtained through the seismic performance analysis of the pier. Then, seismic vulnerability of rigid pier with ECC and high-strength bars is analyzed. The results show that it is feasible to improve the seismic performance of the piers by using ECC and high-strength bars. Considering the economic rationality, the replacement height of ECC in plastic hinge regions can be determined according to the curvature change point. For the rigid pier, the economical and reasonable volume stirrup ratio is 0.78%. The ultimate curvature of RC/ECC pier bottom increases by 12.4% when the longitudinal bars of the pier are replaced by high-strength bars, and the energy dissipation capacity increases by 22.5% on average. Compared with the pier’s original design, the exceedance probability of each limit state of the rigid pier with ECC and high-strength bars is significantly reduced. Its seismic performance is superior, and the risk of seismic damage is significantly reduced.

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