Seismic partitioned fragility analysis for high‐rise RC chimney considering multidimensional ground motion

Abstract

Summary In order to identify the vulnerable parts and areas of the high‐rise reinforced concrete chimney, this paper presents an effective method, which called partitioned fragility analysis. One 240‐m‐high reinforced concrete chimney was selected as the practical project, and its analytical model was created with ABAQUS software. The selected high‐rise chimney structure was divided into 17 parts, and then the damage probability of each part in different damage states was obtained with the fragility analysis considering multidimensional ground motions. Twenty ground motion records were taken from the Next Generation Attenuation database as the input motions, and the peak ground acceleration was selected as the intensity measure. The response of the chimney structure under multidimensional ground motions was obtained based on incremental dynamic analysis. The maximum strains of concrete and steel bars were defined as the damage limit states of the chimney structure. The fragility curves and surfaces obtained from this analysis showed that the vulnerable areas of the chimney structure appear at 0–20 m, 90–130 m, and 150–200 m along the height of the chimney respectively. Based analytical results, these vulnerable parts can be retrofitted to enhance the seismic resistance of existing chimney structures. And the partitioned fragility analysis method can also be used to improve the design of new chimney structures.

Seismic vulnerability assessment of a high-rise molten-salt solar tower based on incremental dynamic analysis

“…According to the research of high-rise chimney [11,23], the PGA is selected as the IM and the DMs choose the compressive strain of the concrete and the tensile strain of the reinforcement. According to reference [24], the earthquake damage of the tower is classified into 5 levels, which are: basically intact (DS1), minor damage (DS2), moderate damage (DS3), severe damage (DS4), destruction (DS5).…”

“…According to reference [24], the earthquake damage of the tower is classified into 5 levels, which are: basically intact (DS1), minor damage (DS2), moderate damage (DS3), severe damage (DS4), destruction (DS5). In order to determine the damage level of the tower, four corresponding Limit States (LS) LS1-LS4 are needed to be defined, as indicated in Table 5 [11]. The selection of ground motions has a great influence on the IDA results.…”

“…Huang et al performed a pushover analysis of a collapsed reinforced concrete chimney to find a cause of the failure [10]. Zhou et al conducted a seismic partitioned fragility analysis of a 240-m-high reinforced concrete chimney [11]. Deng et al investigated the seismic effects of a solar receiver installed on concrete towers with different fundamental periods [12].…”

Seismic Fragility Curves for Tall Concrete Wall Building in Malaysia Subjected to Near-Field Earthquakes

“…In this method, finite element models are established and subjected to earthquake records. The analytical method has been employed by several researchers to develop fragility curves of different types of structures including ATC towers [7], bridges [8], tunnels [9], wind turbine [10], reinforced concrete chimneys [11], process towers [12], and masonry structures [13]. The hybrid method produces a realistic estimation for earthquake damage.…”

Earthquake Response Analysis of Tall Reinforced Concrete Chimneys considering Eccentricity

“…Minghini et al [12] analyzed a brickwork chimney and a shear failure mechanism of the upper part of the chimney damaged by the 2012 Emilia earthquake. Zhou et al selected an existing 240 m tall RC chimney as the research object and analyzed the seismic vulnerability curve of the chimney by considering structural damage [13], structural nonlinearity [14], and multidimensional earthquake [15] and evaluated and analyzed the vulnerability of the chimney structure.…”