Fragility Functions for Older Reinforced Concrete Beam-Column Joints

2006 ◽  
Vol 22 (1) ◽  
pp. 215-238 ◽  
Author(s):  
Catherine A. Pagni ◽  
Laura N. Lowes
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Probability Distributions ◽  
Experimental Studies ◽  
Reinforced Concrete Beam ◽  
Fragility Functions ◽  
Reinforcement Probability ◽  
Concrete Crack ◽  
Damage States ◽  
Joint Deformation

Fragility functions are developed to predict the method of repair required for older reinforced concrete beam-column joints damaged due to earthquake loading. The results of previous experimental studies are used to develop empirical relationships between damage states and engineering demand parameters, such as interstory drift, joint deformation, and number of load cycles. Damage states are proposed and linked deterministically with commonly employed methods of repair; these damage states are characterized by parameters such as concrete crack width, extent of concrete spalling, and yielding and buckling of reinforcement. Probability distributions are fit to the empirical data and evaluated using standard statistical methods. The results of this effort are families of fragility functions that predict the required method of repair for a damaged joint.

Fragility Functions for Modern Reinforced-Concrete Beam-Column Joints

2007 ◽  
Vol 23 (2) ◽  
pp. 263-289 ◽  
Author(s):  
Peter C. Brown ◽  
Laura N. Lowes
Keyword(s):  
Reinforced Concrete ◽  
Probability Distribution ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Experimental Investigations ◽  
Fragility Functions ◽  
Earthquake Loading ◽  
Empirical Relationships ◽  
Damage States ◽  
Standard Probability

Fragility functions are developed to predict the method of repair required for modern reinforced-concrete beam-column building joints subjected to earthquake loading. These fragility functions, in combination with similar fragility functions developed previously for older joints, are used to compare damage progression in older versus modern joints. To develop fragility functions for modern joints, the results of previous experimental investigations are used to generate empirical relationships between damage and earthquake demand, damage states are linked deterministically with commonly employed methods of repair, and the empirical data are modeled using a standard probability distribution. The demand parameters, damage states, methods of repair, and probability distribution used in the current study are chosen to facilitate comparison with results from the previous study. The results of this study are a family of fragility functions that can be used to predict the method of repair required for a modern joint damaged due to earthquake loading and an improved understanding of the relative vulnerability of older versus modern components.

Modeling the operation of structures made of dispersed-reinforced concrete with an alternating dynamic load of high intensity

2021 ◽  
Vol 14 (3) ◽  
pp. 36-44
Author(s):  
S. Nikolenko ◽  
Svetlana Sazonova ◽  
Viktor Asminin
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Load ◽  
High Intensity ◽  
Concrete Beam ◽  
Static Load ◽  
Dynamic Compression ◽  
Experimental Studies ◽  
Reinforced Concrete Beam ◽  
Beam Elements ◽  
Laminated Structures

A study of the properties of dispersed-reinforced concrete and a study of the effect of dispersed reinforcement on the operation of structures was carried out, mainly with a static load of the same sign. Based on the results of experimental studies, a comparison was made of the work of dispersed-laminated structures under alternating dynamic action of high intensity with the work of reinforced concrete beam elements under similar influences. The results of experimental studies of cubes and prisms for static and dynamic compression are also presented. The results of experimental studies allow us to conclude that there is a significant effect of dispersed reinforcement on the operation of structures under the investigated influences and the feasibility of combined reinforcement of structures. The use of dispersed reinforcement in structures will increase the resistance of structures to such influences.

Fragility Functions for Steel Plate Shear Walls

2012 ◽  
Vol 28 (2) ◽  
pp. 405-426 ◽  
Author(s):  
Nicole M. Baldvins ◽  
Jeffery W. Berman ◽  
Laura N. Lowes ◽  
Todd M. Janes ◽  
Natalie A. Low
Keyword(s):  
Steel Plate ◽  
Probability Distributions ◽  
Experimental Studies ◽  
Shear Walls ◽  
Fragility Functions ◽  
Empirical Relationships ◽  
Steel Plate Shear Walls ◽  
Story Drift ◽  
Damage States ◽  
Lognormal Probability

Fragility functions are developed to predict the method of repair required for steel plate shear walls damaged due to earthquake loading. The results of previous experimental studies are used to develop empirical relationships between damage states and story drift. Damage states are proposed and linked deterministically with commonly employed methods of repair; these damage states are characterized by parameters such as yielding and tearing of the steel plate and yielding, buckling and fracture of frame members. Lognormal probability distributions are fit to the empirical data and evaluated using standard statistical methods. The results of this effort are families of fragility functions that predict the required method of repair for a damaged wall.

scholarly journals EXPERIMENTAL TEST INSTALLATION OF BENDING REINFORCED CONCRETE BEAM ELEMENTS

2019 ◽  
Vol 9 (3) ◽  
pp. 12-16
Author(s):  
Denis A. PANFILOV ◽  
Nikolay A. ILIYIN ◽  
Sergey S. MORDOVSKY ◽  
Yana A. BUZOVSKAYA
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Experimental Studies ◽  
Reinforced Concrete Beam ◽  
Technical Solution ◽  
Test Installation ◽  
Measuring Device ◽  
Beam Elements ◽  
Experimental Installation ◽  
Supporting Element

The article outlines a new technical solution related to the field of construction, in particular to the testing technique, the testing of materials and structures, and the application for conducting experimental studies of the strength and deformability parameters of reinforced concrete beam elements under static bending conditions. The experimental installation includes a pre-assembled booth, a loading mechanism, a force measuring device, a thrust element and a strap clamp. In this case, the stand contains a stop element, jacks, tensioning clamps, test specimen. The supporting element is composite and contains a base in the form of a channel and an amplifier in the form of a two-lobe. Clamping hooks are made in the form of tight fastened anchorages, equipped with roller supports. As a loading device, jacks are installed in the crevice-slot of the channel and secured by mounting screws to the base of the thrust element. The compact, simple and easy experimental installation with the increased reliability of the power device, tensioning clamps and roller bearings of the subject under bending of the concrete sample is offered.

scholarly journals Experimental Studies on Reinforced Concrete and Ferrocement Beams

2016 ◽  
Vol 5 (3) ◽  
pp. 77
Author(s):  
N. Jayaramappa
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Concrete Beam ◽  
Experimental Studies ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Wire Mesh ◽  
Hollow Beam ◽  
Straight Beam ◽  
Hollow Beams

<div><p><em>Arch structures have been utilized through the ages, beginning in the ancient civilizations of Greece, Egypt and Rome, to present day with their common use in bridges. Arches are well known for the ability to carry loads spanning large areas. Also now a day’s Ferrocement is being used extensively for various applications where use of normal concrete is hard to fulfil the present day requirements. In this paper experimental studies are carried out to understand the flexural behaviour of Reinforced concrete beams of grade M20 with HYSD reinforcement and Ferrocement hollow beams of cement to sand ratio of 1:3 and water cement ratio of 0.4. A total of four beams were  cast in which two are straight beams and another two are arched beams. In that two straight beam, one is reinforced concrete beam with minimum reinforcement and another one is Ferrocement hollow beam and in two arch beams, one is reinforced concrete beam and other is Ferrocement hollow beam. All beams are rectangular in cross-section of size 200 x 200 mm and the span length is 2500 mm. The arch beam is provided with a rise at centre of 0.8 m. The Ferrocement beam is made of mortar with hollow cross section using hexagonal wire mesh with thickness of 40 mm and all the specimens are cured for 28 days. Flexural tests are carried out on conventional RC beam and Ferrocement hollow beams for simply supported condition. The test results are presented in terms of load deflection behaviour, ultimate load, cracking load and crack pattern with respect to reinforced concrete beam and Ferrocement hollow beam.</em></p></div>

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