Experimental Testing and Analytical Modeling of Glulam Moment Connections with Self-Drilling Dowels

2021 ◽  
Vol 147 (5) ◽  
pp. 04021047
Author(s):  
Wenchen Dong ◽  
Minghao Li ◽  
Minjuan He ◽  
Zheng Li
Keyword(s):  
Analytical Modeling ◽  
Experimental Testing ◽  
Moment Connections

An innovative detail for precast concrete beam–column moment connections

1991 ◽  
Vol 18 (4) ◽  
pp. 690-710
Author(s):  
Hany Ahmed El-Ghazaly ◽  
Heyad Saud Al-Zamel
Keyword(s):  
Concrete Beam ◽  
Experimental Testing ◽  
Precast Concrete ◽  
Steel Frame ◽  
Reinforcing Bars ◽  
Shear Tests ◽  
Moment Connections ◽  
Modes Of Failure ◽  
Moment Resisting ◽  
Flexural Tests

A new detail is introduced for precast concrete beam-to-column moment connections. The detail consists of a connecting steel frame used to mechanically connect the threaded end protruding reinforcing bars from beam and column. The connection detail is made convenient to assemble where the erection method resembles that of steel construction. No idle crane time is necessary, since the connecting steel frame is designed to carry the beam's own weight. When the connection construction is completed, the joint functions as a moment resisting hard connection. The experimental testing program involved testing of twelve full-scale specimens in addition to a pilot test. Of the twelve tests seven are flexural tests, three are shear tests, and two are monolithic flexural tests for comparison. Modes of failure in the flexural tests were mainly due to rupture of tension reinforcement; however, premature slippage of the rebars may occur under certain conditions, but could be conveniently prevented. In the shear tests, diagonal tension crack failure predominated. If the connection parameters are properly selected, the connection will be capable of developing the beam's full plastic moment and undergo sufficient rotation before collapse. Key words: precast concrete, moment connections, connecting steel frame, stiffness, strength, ductility.

Experimental testing and analytical modeling of CFS shear walls filled with LPM

Structures ◽  
2020 ◽  
Vol 27 ◽  
pp. 917-933
Author(s):  
Wanqian Wang ◽  
Jingfeng Wang ◽  
T.Y. Yang ◽  
Lei Guo ◽  
Huihui Song
Keyword(s):  
Analytical Modeling ◽  
Experimental Testing ◽  
Shear Walls

Examine the Bending Stiffness of Generalized Kresling Modules for Robotic Manipulation

2020 ◽  
Author(s):  
Joshua Kaufmann ◽  
Suyi Li
Keyword(s):  
Analytical Modeling ◽  
Experimental Validation ◽  
Experimental Testing ◽  
Stable State ◽  
Building Blocks ◽  
Longitudinal Axis ◽  
Bending Stiffness ◽  
Robotic Manipulation ◽  
Stable States ◽  
Hinge Model

Abstract Via analytical modeling and experimental validation, this study examines the bending stiffness adaptation of bistable origami modules based on generalized Kresling pattern. These modules, which are the building blocks of an octopus-inspired robotic manipulator, can create a reconfigurable articulation via switching between their stable states. In this way, the manipulator can exhibit pseudo-linkage kinematics with lower control requirements and improved motion accuracy compared to completely soft manipulators. A key to achieving this reconfigurable articulation is that the underlying Kresling modules must show a sufficient difference in bending stiffness between their stable states. Therefore, this study aims to use both a nonlinear bar-hinge model and experimental testing to uncover the correlation between the module bending stiffness and the corresponding origami designs. The results show that the Kresling origami module can indeed exhibit a significant change in bending stiffness because of the reorientation of its triangular facets. That is, at one stable state, these facets align close to parallel to the longitudinal axis of the cylindrical-shaped module, so the module bending stiffness is relatively high and dominated by the facet stretching. However, at the other stable states, the triangular facets are orientated close to perpendicular to the longitudinal axis, so the bending stiffness is low and dominated by crease folding. The results of this study will provide the necessary design insights for constructing a fully functional manipulator with the desired articulation behavior.

scholarly journals Design of a Compliant Gripper With Multimode Jaws

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Guangbo Hao ◽  
Haiyang Li ◽  
Abhilash Nayak ◽  
Stephane Caro
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Modeling ◽  
Layer Structure ◽  
Experimental Testing ◽  
Element Analysis ◽  
Operation Modes ◽  
Linear Actuators ◽  
Multiple Operation ◽  
Comparison Of The Results

This paper presents the design of a multimode compliant gripper, using the singularities of the four-bar mechanism with equilateral links. The mobility of the compliant gripper can be reconfigurable to grasp a variety of shapes or adapt to specific requirements. The compliant gripper is a compact and two-layer structure. Two linear actuators are required to enable the multiple operation modes, by the conversion of two pairs of slider-crank mechanisms. A multimode compliant four-bar mechanism is first presented and kinematically analyzed. The design and the kinetostatic modeling of the resulting compliant gripper are then performed. Finally, the analysis of the reconfigurable compliant gripper under different actuation schemes is carried out, including the comparison of the results obtained from analytical modeling, finite element analysis (FEA), and experimental testing.

Seismic Evaluation of Low-Rise Reinforced Masonry Buildings with Flexible Diaphragms: III. Synthesis and Application

2006 ◽  
Vol 22 (2) ◽  
pp. 329-347 ◽  
Author(s):  
Gregory L. Cohen ◽  
Richard E. Klingner ◽  
John R. Hayes ◽  
Steven C. Sweeney
Keyword(s):  
Earthquake Engineering ◽  
Analytical Modeling ◽  
Seismic Analysis ◽  
Experimental Testing ◽  
Evaluation Methodology ◽  
Masonry Buildings ◽  
Seismic Evaluation ◽  
Reinforced Masonry ◽  
Shaking Table Testing ◽  
Flexible Diaphragms

This paper outlines the last two phases of a joint research study performed by the University of Texas at Austin and the U.S. Army Corp of Engineers, Construction Engineering Research Laboratory, Engineer Research and Development Center (CERL). The study coordinates and synthesizes experimental testing, analytical modeling, practical implementation, and real-world application to enhance FEMA-310, the predominant seismic evaluation methodology for low-rise reinforced masonry buildings with flexible diaphragms. In earlier phases of study, conclusions from shaking-table testing, quasi-static testing, and analytical modeling were used to develop a simple tool for the seismic analysis of these types of buildings. In this paper, the tool is developed in the context of performance-based earthquake engineering into a supplementary evaluation methodology intended to fill a gap in FEMA-310. The tool is applied to four existing buildings and ultimately shown to be simple, useful, and necessary.

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