A Proposal for an Assessment Method of the Dynamic Resistance of Concrete Slab Viaducts Subjected to Impact Loads Caused by Mining Tremors

Abstract

The article presents a method for assessing dynamic resistance of existing reinforced concrete slab road viaducts subjected to mining tremors. For this purpose there are formulated six criteria to determine the maximum permissible value of the component ground vibrations (a x,dop , a y,dop, a z,dop).Within each criterion, a reference is made to the most critical components, for which for which the Author has formulated strength and kinematic conditions, reflecting the behaviour of the structure under dynamic excitation caused by mining tremor. The permissible range of structural behaviour was set by comparing the effects of load combinations adopted at the design stage with a seismic combination proposed in [12]. In the field of dynamic analysis the response spectrum method was used, taking into account the guidelines for the adaptation of Eurocode 8 for the calculation the response of construction to the influence of mining tremors. Finally, in accordance with the established procedure calculations were carried out and and results are presented for a sample reinforced concrete slab road viaduct.

Machine-Learning Methods for Assessing Dynamic Resistance of Existing Bridge Structures Subjected to Mining Tremors

“…All of the analyses were carried out using the information collected in the database of the dynamic resistance of reinforced concrete flyovers with a slab span system to the impacts of mining tremors. The database was prepared as a result of multiple numerical FEM analyses, in line with the procedure of resistance assessment according to [12].…”

“…This paper [12] presents a proposal for assessing the dynamic resistance of existing bridge structures to the impact of mining tremors. This procedure involves determining the margin of the load-bearing capacity of a given structure resulting from the assumptions adopted at the design stage, where additional effort on its load-bearing elements may be allowed in the event of a mining tremor.…”

“…An additional problem that concerns the existing reinforced concrete bridge structures is a lack of precise information on the strength parameters, strength of reinforcement of the load-bearing components, or parameters reflecting the current friction in the sliding bearings. The criteria specified in [12] allow for the assessment of resistance in the absence of information on the compressive strength of the concrete, which is the building material of various elements of the load-bearing structure and the actual reinforcement of the elements. However, parameters such as the modulus of elasticity of the concrete and the coefficient of friction in the bearings must be determined to perform a numerical analysis.…”

The impact of predicted vibrations from mining shocks on the viaduct – case study

“…-checking the stresses in the elements of hangers, -checking the horizontal forces affecting the bearing supports, -checking the vertical forces acting on bearing supports, -checking the stresses in structural elements of load-bearing arches, -checking the cross-section forces in support pillars in axes 3 and 4, -checking the condition of destruction of the dilatation of the object. The above conditions in similar objects determine their dynamic resilience [4][5][6]10]. Detailed results of dynamic analyses are presented, among others at work [11].…”

“…In the case of road overpasses, this is particularly important as these are buildings important from the point of view of the functioning of urbanized areas. Road viaducts and footbridges in the aspect of dynamic interactions were the subject of scientific papers [3][4][5][6].…”