Application of controlled blasting demolition technology in ultra-high coaxial thin-walled steel inner cylinder reinforced concrete chimney

Yabo, Chai; Luo, Ning; Zhang, Haohao; Yujie, Duan; Mou, Gongyu; Sun, Wei; Dong, Jie

doi:10.1016/j.cscm.2023.e01936

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Zhai et al analyzed the rupture mechanism and zoning characteristics of concrete walls under blasting action, studied the effects of stress waves and high-pressure gas expansion on the blast demolition process through a simulation using the finite element software LS/dyna to establish a blast demolition kinetic model, and determine the crushing zone caused by reflected stress waves in concrete and a radial fracture range according to the maximum tensile stress theory [16]. Chai et al used finite element software to simulate and study the collapse motion law of ultra-high coaxial thin-walled steel inner cylinder reinforced concrete chimney (UCTS-RCC), successfully establishing the theoretical model of SIC cut-angle selection and overall synchronous tipping of UCTS-RCC, and then successfully demolished a UCTS-RCC building [17]. To study the mechanical properties of high-rise steel structures during collapse, Xiaoguang Zhou updated the Lagrangian algorithm by means of the momentum conservation equation and the imaginary work equation and simulated it using LS-DYNA (19.0) software.…”

Section: Introductionmentioning

confidence: 99%

Case Study on the Effect of Delay-Time Differences between Columns during Blasting Demolition of RC Structures with a Small Height-to-Width Ratio

et al. 2023

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Blasting demolition plays an important role in building demolition, and numerical-simulation methods can facilitate the optimization of blasting-demolition schemes. To study the influence of the delay-time differences between columns on the blasting and demolition effect of small-aspect-ratio reinforced concrete structures, a separated common node model of small-aspect-ratio structures was established through the finite element numerical simulation software ANSYS/LS-DYNA. The results showed that the delay-time differences between columns influenced the position of the plastic hinge of the structure, and the plastic hinge was located at the end of the back span beam when the delay-time difference was 0.1~0.3 s. The plastic hinge moves to the top of the back row of the columns of the first floor at 0.4~0.8 s and to the end of each span of the beams at 0.9 s. When the plastic hinge is at the end of the beam, the orientation axis is located at the bottom of the back row of the columns of the first floor. Moreover, when the plastic hinge is at the top of the back row of the columns of the first floor, the orientation axis is at the same position as the plastic hinge. The delay-time difference also affects the recoil distance of the structure as well as the height of the burst pile. To ensure that the structure can be successfully collapsed under the preconditions of disintegration, for a small height-to-width ratio structure, the appropriate intercolumn delay-time difference is 0.4~0.5 s.

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Section: Introductionmentioning

confidence: 99%

Case Study on the Effect of Delay-Time Differences between Columns during Blasting Demolition of RC Structures with a Small Height-to-Width Ratio

et al. 2023

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Novel Index for Structural Demolition Efficiency

Adel,

Eraky,

Samir

et al. 2024

Preprint

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The demolition process is just as important as the construction process when the building's life span comes to an end, or if there are construction or soil issues. Although there are various traditional and non-traditional demolition methods used to demolish different structures in various scenarios, there are no criteria or indicators to evaluate the efficiency of demolition methods or scenarios. Thus, an indicator is defined in this research to determine whether the demolition scenario is the optimal one. The use of this indicator provides the selection of appropriate values for parameters that control the demolition process, such as delay time, the columns to be blown up, and the collapse mechanism. The proposed indicator relies on the maximum distance of debris, which is crucial for determining the safe zone during the demolition process. To pronounce the benefit of using this indicator, it is calculated for a real-case explosive demolition radio mast with a height of 220 m and for a tall building consisting of 15 floors by using extreme loading for structures software (ELS) that uses the Applied Element Method (AEM). The delay time parameter is studied in this research to show its effect on demolition efficiency. It is found that a suggested demolition scenario for the mast tower is better than the real demolition by thirteen times, and for the multi-story building demolition, it is found that the optimum value of delay time is 0.3 sec.

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Application of controlled blasting demolition technology in ultra-high coaxial thin-walled steel inner cylinder reinforced concrete chimney

Cited by 2 publications

References 13 publications

Case Study on the Effect of Delay-Time Differences between Columns during Blasting Demolition of RC Structures with a Small Height-to-Width Ratio

Case Study on the Effect of Delay-Time Differences between Columns during Blasting Demolition of RC Structures with a Small Height-to-Width Ratio

Novel Index for Structural Demolition Efficiency

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