Component Tests of Huge Scale All-Steel Multi-Curve Buckling Restrained Braces

2012 ◽  
Author(s):  
C. S. Tsai ◽  
H. C. Su ◽  
T. C. Chiang ◽  
Y. C. Lin
Keyword(s):  
Quality Control ◽  
Energy Dissipation ◽  
Axial Load ◽  
Structural Damage ◽  
Theoretical Calculations ◽  
Steel Tube ◽  
Buckling Strength ◽  
The Core ◽  
Buckling Restrained Brace ◽  
Component Test

Many countries have gradually adopted the buckling-restrained brace (BRB) for preventing structural damage during earthquakes since its introduction in the 1970s. In this study, we propose an all-steel BRB called the multi-curve buckling-restrained brace (MC-BRB) to overcome the shortcomings of traditional BRBs that use mortar encased in a steel tube. This new BRB consists of double core plates, each with multiple neck portions that form multiple energy dissipation segments, enlarged segments, lateral support elements, and constraining elements that are designed to prevent the BRB from buckling. The enlarged segment located in the middle of the core plate can be connected to the lateral support and constraining elements to increase buckling strength and prevent the lateral support and constraining elements from sliding during earthquakes. The lateral support elements can be windowed to allow quality control checks to be performed and the condition of the core plate to be monitored after an earthquake. In this study, a huge-scale component test with an axial load of 14000 KN in the core plates was carried out to investigate the behavior of the new BRB and its capabilities for seismic mitigation. A comparison of the experimental results and theoretical calculations indicate that the all-steel MC-BRB possesses a stable and predictable mechanical behavior under cyclic loadings.

Performance Study on Triple Square Steel Tube Buckling-Restrained Brace with Different Notch of Core Element

2011 ◽  
Vol 374-377 ◽  
pp. 2471-2479
Author(s):  
Rong Tang ◽  
Yun Zhou ◽  
Xue Song Deng ◽  
Shao Ming Lin
Keyword(s):  
Stress Concentration ◽  
Peak Stress ◽  
Steel Tube ◽  
Performance Study ◽  
Core Element ◽  
The Core ◽  
Buckling Restrained Brace ◽  
Yield Displacement ◽  
Energy Dissipation Capacity ◽  
Square Steel Tube

According to the philosophy of “partially weaken the core element of the BRB to protect the other part”, 12 specimens of the Triple Square Steel Tube Buckling-Restrained Brace (TSST-BRB) were designed with which the core element had notched. ABAQUS finite element method was used to investigate the performance of TSST-BRB with different notched kinds, number, length and depth of the core element. The analysis results indicated that the core element with annular notch was conducive to reduce the stress concentration of ends, and dissipate energy under tiny displacement. Two notches of the core element were better to reduce the peak stress of the notched segment and the stress concentration of ends. The length of notch should be controlled on 13.3%~20.0% of the length of core element. The energy dissipation capacity, yield displacement and yield capacity of the TSST-BRB were significantly influenced by the depth of notched core element. The depth of the notch should be controlled on 10%~23.3% of the thickness of core element.

scholarly journals Experimental and Numerical Analysis of Large-Scale Circular Concrete-Filled Steel Tubular Columns with Various Constructural Measures under High Axial Load Ratios

2018 ◽  
Vol 8 (10) ◽  
pp. 1894 ◽  
Author(s):  
Lidong Zhao ◽  
Wanlin Cao ◽  
Huazhen Guo ◽  
Yang Zhao ◽  
Yu Song ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Axial Load ◽  
Large Scale ◽  
Steel Tube ◽  
Test Results ◽  
Welded Steel ◽  
Axial Forces ◽  
Circular Steel Tube ◽  
Cfst Columns

To investigate the effect of constructional measures (including horizontal and vertical stiffeners, rebar cages, embedded steel tubes, and cavity welded steel plates) under high axial load ratios on the seismic performance of concrete-filled steel tubular (CFST) columns, quasi-static tests for six large-scale CFST columns with various constructional measures are performed. All specimens are subjected to identical axial forces. The failure mode, hysteresis characteristics, bearing capacity, stiffness degradation, ductility, and energy dissipation of specimens are analyzed. The study shows that the horizontal stiffener delays the occurrence and severity of column base buckling, the vertical stiffener improves the bending resistance capacity and initial stiffness of the member, the rebar cage improves the ductility, and the embedded circular steel tube significantly improves the member’s bearing capacity, ductility, and energy dissipation. When an internal circular steel tube and cavity welded steel plate are applied in tandem, the section steel ratio increases by 4.42% and the bearing capacity improves by 42.72%. A finite element model is created to verify test results, and simulation results match the test results well.

scholarly journals Automation of dissolution tests

2003 ◽  
Vol 25 (1) ◽  
pp. 7-15 ◽  
Author(s):  
Rolf Rolli
Keyword(s):  
Quality Control ◽  
In Vitro Dissolution ◽  
Pharmaceutical Companies ◽  
Dissolution Testing ◽  
Simultaneous Operation ◽  
Task Forces ◽  
The Core ◽  
Dissolution Tests ◽  
The 1960S

Dissolution testing of drug formulations was introduced in the 1960s and accepted by health regulatory authorities in the 1970s. Since then, the importance of dissolution has grown rapidly as have the number of tests and demands in quality-control laboratories. Recent research works lead to the development of in-vitro dissolution tests as replacements for human and animal bioequivalence studies. For many years, a lot of time and effort has been invested in automation of dissolution tests. There have been a number of in-house solutions from pharmaceutical companies and many have created task forces or even departments to develop automation. Robotic solutions with sequential operation were introduced as well as the simultaneous operation concept developed by SOTAX. Today, pharmaceutical companies focus their resources mainly on the core business and in-house engineering solutions that are very difficult to justify. Therefore, it is important to know the basic considerations in order to plan an automation concept and implement it together with a vendor.

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.

Study on Stress Measurement of the MSG Magnetic Measurement Stress Sensor Based on Composite Properties of Materials

2013 ◽  
Vol 668 ◽  
pp. 101-104
Author(s):  
Tie Liu Wang ◽  
Zhong Yi Wang ◽  
Wei Wan
Keyword(s):  
Working Conditions ◽  
Stress Measurement ◽  
Theoretical Calculations ◽  
Magnetic Measurement ◽  
Good Correspondence ◽  
Stress Sensor ◽  
The Core ◽  
Properties Of Materials ◽  
Magneto Resistance ◽  
Composite Properties

The magnetic measurement stress sensor is the core of the magnetic measurement stress technology. Magnetic measurement stress sensor using magnetostriction and Giant Magneto Resistance (GMR) theory has good correspondence between stress and magnetic, and been validated scientific and reliable through indoor experiments and engineering applications. This paper gives a method on stress sensor anode calibration, verifies the different performance of the sensor based on different materials, makes an analysis of the error between the theoretical calculations and actual measurements of the standard objects, describes the working conditions of using the sensor and indicates a reasonable match is a prerequisite to obtain the desired signal processing results.

Quality control loops: the core of integrated quality assurance

1991 ◽  
pp. 423-443
Author(s):  
Manfred Weck ◽  
Walter Eversheim ◽  
Wilfried König ◽  
Tilo Pfeifer
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Control Loops ◽  
The Core

scholarly journals Microautophagy – distinct molecular mechanisms handle cargoes of many sizes

2020 ◽  
Vol 133 (17) ◽  
pp. jcs246322 ◽  
Author(s):  
Sebastian Schuck
Keyword(s):  
Quality Control ◽  
Molecular Mechanisms ◽  
Snare Proteins ◽  
Metabolic Adaptation ◽  
The Core ◽  
Range Of Functions ◽  
Fusion Type ◽  
Functional Versatility

ABSTRACTAutophagy is fundamental for cell and organismal health. Two types of autophagy are conserved in eukaryotes: macroautophagy and microautophagy. During macroautophagy, autophagosomes deliver cytoplasmic constituents to endosomes or lysosomes, whereas during microautophagy lytic organelles take up cytoplasm directly. While macroautophagy has been investigated extensively, microautophagy has received much less attention. Nonetheless, it has become clear that microautophagy has a broad range of functions in biosynthetic transport, metabolic adaptation, organelle remodeling and quality control. This Review discusses the selective and non-selective microautophagic processes known in yeast, plants and animals. Based on the molecular mechanisms for the uptake of microautophagic cargo into lytic organelles, I propose to distinguish between fission-type microautophagy, which depends on ESCRT proteins, and fusion-type microautophagy, which requires the core autophagy machinery and SNARE proteins. Many questions remain to be explored, but the functional versatility and mechanistic diversity of microautophagy are beginning to emerge.

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