Accidental actions values and combinations for key-elements checking

Tur, Viktar; Tur, Andrei; Lizahub, Aliaksandr; Derechennik, Stanislav S.

doi:10.1051/e3sconf/202021202019

Cited by 2 publications

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References 3 publications

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“…The accidental combination includes the characteristic value of the dead load and the quasi-permanent value of the imposed load. Basic rules for accidental load combinations when checking damaged structural systems are discussed in detail in [21], [22];…”

Section: Basic Assumptions Of Simplified Analytical Modelsmentioning

confidence: 99%

Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems

Tur

Lizahub

2021

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The article presents the simplified implementation of alternative load path method based on the energy balance approach. This method should be used to check the global resistance of a damaged structural system after the occurrence of an accidental event. Basic assumptions of simplified analytical models for modelling resistance of horizontal ties in a damaged structural system, taking into account the membrane (chain) effects, were presented. An approach to modelling the dynamic resistance of a damaged structural system based on the energy balance method is described. Calculated dependencies for checking the robustness of a prefabricated multi-storey building with hollow-core slabs after the loss of the central column are proposed and considered using an example. On the considered example, a comparison of the required tie sections area with the dynamic resistance designed using the energy balance method (EBM) and according to the current standards, and a statistical assessment of the reliability of the load-bearing capacity models are carried out. In the end, a brief algorithm for the simplified calculation of the dynamic resistance of a damaged structural system is proposed.

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Section: Basic Assumptions Of Simplified Analytical Modelsmentioning

confidence: 99%

Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems

Tur

Lizahub

2021

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Checking of the robustness of precast structural systems based on the energy balance method

Tur

Lizahub

2021

Vestnik MGSU

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Introduction. The robustness requirements should be fulfilled already at the stage of conceptual design of the structural system, taking into account the use of various strategies for its protection from progressive collapse. Compared to monolithic reinforced concrete structural systems, precast concrete systems are more susceptible to the effects of accidental actions. To ensure the integrity of the damaged system in the original prefabricated structural system, it is necessary to provide (reserve) a sufficient number of horizontal (internal and perimetric) and vertical ties with the required degree of continuity and plastic deformability. Materials and methods. Analytical models of the resistance of horizontal ties based on the equations of the energy balance of the system. Results. On a real example of a prefabricated floor, calculations of the required parameters of horizontal ties were performed according to the proposed dependencies, based on the model of the energy balance of the system and the design models included in the standards of various countries. Comparison of the results obtained showed that the calculation models of the norms in a number of cases can give an unsafe result, underestimating the required cross-sectional area of horizontal ties. This is due to the fact that all dependencies for calculating the tie forces are based on constant values of the ultimate deflection (usually from 1/6 to 1/10 of the span) without checking the limiting deformability of horizontal ties. Conclusions. Deformability of ties is one of the basic parameters that should be monitored when checking the robustness of structural systems made of precast concrete. The proposed method, based on the provisions of the energy balance, makes it possible to take into account the limiting deformability of horizontal ties when determining the membrane (chain) forces and calculate the maximum dynamic response of the damaged structural system.

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Accidental actions values and combinations for key-elements checking

Cited by 2 publications

References 3 publications

Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems

Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems

Checking of the robustness of precast structural systems based on the energy balance method

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