Motivated by one of the concepts in the field of health monitoring for structural systems, a damage detection procedure
is developed. In order to perform the system health monitoring, structural health along with sensor and actuator
malfunction must be continuously checked. As a step toward developing a system health-monitoring scheme, this paper
investigated structural damage detection, using a constrained eigenstructure assignment. The proposed damage detection
method is constructed based on a concept of control theory and subspace rotation for two-dimensional (2D)-structural
systems. To demonstrate the capabilities of the developed damage detection algorithm, the behavior of a simulated
degraded braced-frame structure is studied. Using Monte Carlo simulation, the performance of the approach is evaluated.
It shows that the proposed algorithm is potentially promising for application to real cases.
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A strain-consistent approach for determination of bounds of ductility damage index for different performance levels for seismic design of RC frame members
The aspects of a robust and practical damage-based deterministic seismic design approach for reinforced concrete (RC) buildings have been discussed. The proposed performance-based design approach can be used for different structural systems by using fundamentals of reinforced concrete behavior and practical analyses. Several aspects of the proposed design approach need to be tuned including the selection of the damage measure and its quantification for a required performance level. Ductility damage index is a suitable damage measure for performance-based design of RC frame members. Currently, there is no systematic approach for selecting the bounds for a damage index according to the required performance level. The preset values provided in literature are based on engineering judgment and cannot be extended to RC members with all kinds of geometries and detailing. In this article, the correlation of damage level to concrete core and rebar strains is used to establish a procedure for determination of damage index intervals for different performance levels of RC plastic hinges. Then, the developed procedure is illustrated through numerical simulations for square and circular columns. The strain consistent curvature ductility damage index values are determined for operational, immediate occupancy, life-safety, and collapse prevention performance levels used for seismic design of new columns.
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Quote:The Industrial Police on Tuesday had instructed the garment owners to keep their factories closed after a big crack appeared in the building. They wanted to bring in an engineer from BUET to decide if the structure was safe for use, Mustafizur Rahman, Director for Industrial Police told reporters at the site of the collapse.
The people responsible acted very wrong.
Quote:The Rana Plaza is owned by Md Sohel Rana. He had apparently said the cracks were nothing serious.
Quote:None of us wanted to go in. The bosses came after us with beating sticks. At the end we were forced to get in.
A data base on cyclical soil strength would be of significant assistance in many phases of site evaluation where detailed complete cyclical soil testing is not available or could not economically be obtained. The objective of this study was to develop a partial data base for determining the seismic strength of saturated cohesionless materials, and, by using this data base, to broaden understanding of the mechanism of soil liquefaction induced in the laboratory.
The study is in support of efforts to mitigate the effects of earth-quakes through improved methods for determining the seismic strength of soils. To assist in this problem, cyclic triaxial test data were compiled from published literature and from commercial and research laboratories involved in cyclic testing of cohesionless soils; the data were organized, reviewed, and evaluated. Results were grouped by soil type (Unified Classification System). This data may assist geotechnical engineers to evaluate the seismic strength of cohesionless materials.
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How the strength properties of gravel soils depend on the type and state of the sand filling the pores
Author: A. A. Vasil'eva, V. V. Mikheev, G. L. Lobanova | Size: 502 KB | Format:PDF | Quality:Unspecified | Publisher: Soil Mechanics and Foundation Engineering | Year: 1971 | pages: 5
Little information is available on the shear parameters of coarse detrital soils. Because these conrain
large fragments, it is very difficult to determine their shear resistances. Apparatus and methods (of
laboratory and field types) for investigation of coarse detrital soils have not yet been perfected. Construction
Specification SNiP II-B.I-62 states that the normative pressures on bases of coarse detrital soils
should depend on the type and state of the filler. But in determining the shear parameters of the pore fillers
of such soils we meet almost insuperable difficulties owing to the need to prepare the filler while conserving
the natural state of density and wetness.
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Article/eBook Full Name: How the strength properties of gravel soils depend on the type and state of the sand filling the pores
Author(s): A. A. Vasil'eva, V. V. Mikheev, G. L. Lobanova
Edition: 8(3)
Publish Date: 1971
Published By: Soil Mechanics and Foundation Engineering
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Posted by: ssobhan - 04-23-2013, 08:14 AM - Forum: Archive
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PhD Thesis Full Name: Seismic performance of cold formed steel structures, and risk analysis and management for use in earthquake prone regions
Author(s): Zeynalian Dastjerdi, Mehran
Publish Date: 2012
Published By: The University of Queensland
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