scholarly journals Behaviour of Precast Column Foundation Connection under Reverse Cyclic Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
L. Hemamathi ◽  
K. P. Jaya
Keyword(s):  
Cyclic Loading ◽  
Structural Response ◽  
Base Plate ◽  
Precast Column ◽  
Load Carrying ◽  
Column Foundation ◽  
Energy Dissipated ◽  
Plate Connection ◽  
Scaled Models ◽  
Pocket Connection

Precast column foundation connection is one of the critical connections under reverse cyclic loading, and the present study focuses on this connection. Three types of connections were considered, such as (i) base plate connection, (ii) pocket connection, and (iii) grouted sleeve connection. All the above connections were designed, and experimental investigation was carried out on 1 : 2 scaled models by subjecting the column to lateral reverse cyclic loading. Displacement-controlled loading pattern has been adopted for the testing of the specimens. The structural response of the connection was studied for their (i) load-displacement hysteresis behaviour, (ii) stiffness degradation, (iii) energy dissipation, and (iv) ductility. The results were then compared with that of the monolithic connection. The precast connection was more ductile, and the energy dissipated by the pocket connection was high compared to the base plate and grouted sleeve connection. The ductility and the load-carrying of grouted sleeve connection were small compared to other connections. The results of the study showed the precast column foundation can be used in seismic prone areas.

Full scale test of a PC bridge to calibrate assessment methods

2021 ◽  
Author(s):  
Niklas Bagge ◽  
Jonny Nilimaa ◽  
Silvia Sarmiento ◽  
Arto Puurula ◽  
Jaime Gonzalez-Libreros ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Structural Response ◽  
Sensitivity Study ◽  
Assessment Method ◽  
Full Scale ◽  
Concrete Bridges ◽  
Fractional Factorial ◽  
Fe Model ◽  
Load Carrying ◽  
Existing Bridges

<p>In this paper, experiences on the development of an assessment method for existing bridges are presented. The method is calibrated using the results of full-scale testing to failure of a prestressed bridge in Sweden. To evaluate the key parameters for the structural response, measured by deflections, strains in tendons and stirrups and crack openings, a sensitivity study based on the concept of fractional factorial design is incorporated to the assessment. Results showed that the most significant parameters are related to the tensile properties of the concrete (tensile strength and fracture energy) and the boundary conditions. A finite element (FE) model in which the results of the sensitivity analysis were applied, was able to predict accurately the load-carrying capacity of the bridge and its failure mode. Two additional existing prestressed concrete bridges, that will be used to improve further the method, are also described, and discussed.</p>

Thermal-Structural Performance of Orthotropic Pin Fin in Electronics Cooling Applications

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
A. F. M. Arif ◽  
Syed M. Zubair ◽  
S. Pashah
Keyword(s):  
Heat Sink ◽  
Structural Response ◽  
Electronics Cooling ◽  
Base Plate ◽  
Thermal Design ◽  
Heat Flow Rate ◽  
Thermal Interface ◽  
Conductive Composites ◽  
Thermally Conductive ◽  
As Stress

Thermally conductive composites as compared to metals have reduced density, decreased oxidation, and improved chemical resistance, as well as adjustable properties to fit a given application. However, there are several challenges that need to be addressed before they can be successfully implemented in heat sink design. The interface between the device and heat sink is an important factor in the thermal design of microelectronics cooling. Depending on the thermal interface conditions and material properties, the contact pressure and thermal stress level can attain undesirable values. In this paper, we investigate the effect of thermal interface between the fin and base plate on thermal-structural behavior of heat sinks. A coupled-field (thermal-structural) analysis using finite element method is performed to predict temperature as well as stress fields in the interface region. In addition temperature and heat flow rate predictions are supported through analytical results. effect of various interface geometrical (such as slot-depth, axial-gap, and radial-gap) and contact properties (such as air gap with surface roughness and gaps filled with interface material) on the resulting thermal-structural response is investigated with respect to four interface materials combinations, and it is found that the thermal performance is most sensitive to the slot-depth compared to any other parameter.

Parametric analysis of the structural response of steel base plate connections

1999 ◽  
Vol 71 (1) ◽  
pp. 87-103 ◽  
Author(s):  
M.J. Kontoleon ◽  
E.S. Mistakidis ◽  
C.C. Baniotopoulos ◽  
P.D. Panagiotopoulos
Keyword(s):  
Parametric Analysis ◽  
Structural Response ◽  
Base Plate ◽  
Steel Base ◽  
Plate Connections

Liquefaction potential evaluations: energy-based method versus stress-based method

2013 ◽  
Vol 50 (10) ◽  
pp. 1088-1099 ◽  
Author(s):  
Takaji Kokusho
Keyword(s):  
Cyclic Loading ◽  
Strain Energy ◽  
Seismic Energy ◽  
Triaxial Tests ◽  
Sand Layer ◽  
Cyclic Triaxial Tests ◽  
Liquefaction Potential ◽  
Significant Difference ◽  
Sand Deposit ◽  
Energy Dissipated

A dataset of undrained cyclic triaxial tests for liquefaction with parametrically changing relative density and fines content is reviewed and interpreted in the scope of energy. It is found that the strain amplitude or pore-pressure buildup during cyclic loading is uniquely correlated not only to the energy dissipated in soil specimens, but also to strain energy given from outside. Hence, an energy-based method (EBM) is developed in which liquefaction potential can be evaluated by comparing strain energy for liquefaction in a sand layer with upcoming seismic energy without regard to the differences in seismic motions. Comparative studies in soil models demonstrate that the effect of various input motions is intrinsically included in EBM, whereas it has to be considered by choosing proper coefficients in a conventional stress-based method (SBM). Another significant difference is that liquefaction potential tends to be higher for a shallower depth in EBM, while it is vice versa in SBM in a uniform sand deposit.

scholarly journals Mechanical Properties of Aluminium Bracket Strengthening

2019 ◽  
Vol 65 (4) ◽  
pp. 203-216 ◽  
Author(s):  
A. Ambroziak
Keyword(s):  
Mechanical Properties ◽  
Laboratory Investigation ◽  
Carrying Capacity ◽  
Base Plate ◽  
Outer Diameter ◽  
Load Carrying Capacity ◽  
Middle Point ◽  
Steel Base ◽  
Load Carrying ◽  
Crosshead Displacement

AbstractThe aim of the research is laboratory investigation of aluminium brackets employed to fasten lightweight curtain walls to building facilities. Tensile loads perpendicular to end plates (vertical) were applied here. The author focused on the solutions intended to increase the load-carrying capacity of aluminium brackets applying the plain washer form A (DIN 125; ISO 7089), plain washer with an outer diameter about 3d (DIN 9021; ISO 7093) and additional cover plates (straps) in the location of bolt anchoring on the base plate. The aluminium brackets were tested on a steel base and concrete substrate. The flexibility of anchoring strongly affects the increase of the end plate middle point displacement and movable crosshead displacement.

Effect of tangential plasticity on structural response under non-proportional cyclic loading

2019 ◽  
Vol 230 (7) ◽  
pp. 2425-2446 ◽  
Author(s):  
S. Tsutsumi ◽  
R. Fincato ◽  
H. Momii
Keyword(s):  
Cyclic Loading ◽  
Structural Response

Instrumentation Results of New Manual for Assessing Safety Hardware Crash Tested Barriers for William P. Lane, Jr. Bridge

2021 ◽  
pp. 036119812110548
Author(s):  
Travis A Hopper ◽  
Maria Lopez ◽  
Scott Eshenaur
Keyword(s):  
Reinforced Concrete ◽  
Base Plate ◽  
Strain Gauges ◽  
Load Testing ◽  
Steel Rail ◽  
Test Configuration ◽  
Vehicle Impact ◽  
Plate Connections ◽  
Plate Connection ◽  
Deck Slab

Two new bridge barriers were crash tested in accordance with AASHTO Manual for Assessing Safety Hardware (MASH) guidelines for future use on the William P. Lane Bridge over the Chesapeake Bay: (1) a combination barrier consisting of a reinforced concrete parapet with a top steel rail evaluated for Test Level 4 (TL-4); and (2) a combination barrier consisting of a steel parapet with a top steel rail evaluated for test levels TL-4 and TL-5. For the first test configuration, the reinforced concrete barrier was attached to a representative overhang deck slab using anchor rods. In the vicinity of the vehicle impact points, load cells were installed to measure forces in anchor bolts, and strain gauges were attached to reinforcing bars to resolve measured strain data into forces through the overhang deck slab. In the second test configuration, the steel barrier was supported by evenly spaced representative floorbeams using a bolted base plate connection. Strain gauges were attached to elements of the barrier at support locations adjacent to the vehicle impact point to evaluate force transfer through the barrier system into the base plate connections. Linear potentiometers were installed to measure lateral dynamic deflection of the barrier near the vehicle impact region. This paper presents the analysis results of the force, strain, and displacement data measured in the barrier and deck structural components during crash load testing.

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