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RISS 인기검색어
- 검색키워드
- 저자 : Mauro Mezzina (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Stochastic Approach for Analytical Fragility Curves
Giuseppe Carlo Marano,Rita Greco,Mauro Mezzina 대한토목학회 2008 KSCE JOURNAL OF CIVIL ENGINEERING Vol.12 No.5
One of the main problems is the assessment of "residual reliability" or "vulnerability" of a single existing structure, or of a given class of similar structures, against seismic actions. The fragility curves describe the probability of a structure to suffer a given damage level when it is subject to a given seismic excitation level. This research work is focused on an analytical method for constructing fragility curves of existing structures based on a stochastic approach. Analysed structure is modelled by a simple one degree of freedom system subject to a nonstationary Kanai-Tajimi process. The numerical values of the parameters of its constitutive law, here suitably described by means of a hysteretic model, are selected using an identification procedure with the non linear pushover analysis performed on the real assessed structure. To develop fragility curves, a displacement based damage index is adopted. Fragility curves are obtained in terms of probability of exceeding a given damage level by using an approximate crossings theory of stochastic processes.
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Assessment of concrete degradation in existing structures: a practical procedure
Francesco Porco,Giuseppina Uva,Andrea Fiore,Mauro Mezzina 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.4
In the assessment of existing RC buildings, the reliable appraisal of the compressive strength of in-situ concrete is a fundamental step. Unfortunately, the data that can be obtained by the available testing methods are typically affected by a high level of uncertainty. Moreover, in order to derive indications about the degradation and ageing of the materials by on site tests, it is necessary to have the proper terms of comparison, that is to say, to know the reference data measured during the construction phases, that are often unavailable when the building is old. In the cases when such a comparison can be done, the in situ strength values typically turn out to be lower than the reference strength values (tests performed on taken samples during the construction). At this point, it is crucial to discern and quantify the specific effect induced by different factors: ageing of the materials; poor quality of the placement, consolidation or cure of the concreteduring the construction phases; damage due to drilling. This paper presents a procedure for correlating the destructive compressive tests and non-destructive tests (ultrasonic pulse velocity tests) with the data documenting the compressive strength tested during the construction phases. The research work is aimed at identifying the factors that induce the difference between the in-situ strength and cubes taken from theconcrete casting, and providing, so, useful information for the assessment procedure of the building.
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Assessment of concrete degradation in existing structures: a practical procedure
Porco, Francesco,Uva, Giuseppina,Fiore, Andrea,Mezzina, Mauro Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.4
In the assessment of existing RC buildings, the reliable appraisal of the compressive strength of in-situ concrete is a fundamental step. Unfortunately, the data that can be obtained by the available testing methods are typically affected by a high level of uncertainty. Moreover, in order to derive indications about the degradation and ageing of the materials by on site tests, it is necessary to have the proper terms of comparison, that is to say, to know the reference data measured during the construction phases, that are often unavailable when the building is old. In the cases when such a comparison can be done, the in situ strength values typically turn out to be lower than the reference strength values (tests performed on taken samples during the construction). At this point, it is crucial to discern and quantify the specific effect induced by different factors: ageing of the materials; poor quality of the placement, consolidation or cure of the concrete during the construction phases; damage due to drilling. This paper presents a procedure for correlating the destructive compressive tests and non-destructive tests (ultrasonic pulse velocity tests) with the data documenting the compressive strength tested during the construction phases. The research work is aimed at identifying the factors that induce the difference between the in-situ strength and cubes taken from the concrete casting, and providing, so, useful information for the assessment procedure of the building.
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