Cost minimization for safety enhancing of timber beam structures in historical buildings

Abstract

A search method for finding rational parameters of beam structure bearing capacity recovery systems has been developed. This task is relevant to historic buildings containing girders with structural damage. The solution search technique is implemented by the example of calculating the parameters for timber beams external bearing capacity restoration systems with local damage or destruction of supports. An adapted genetic algorithm is used as a tool to solving the problem. A feature of this algorithm is the use of an improved random change operator and the formation of an initial and subsequent solutions sets. In this case, classical evolutionary modelling operators are not used, and the preservation of solutions from iteration to iteration is performed based on modification of the well-known elitism principle. Such computational process has allowed increasing the convergence of the iterative optimization significantly for the tasks considered. Ensuring the structure safety is achieved by strength conditions and regulating the system deflection while minimizing the costs for its operation. Herewith, the objective function allows taking into account both the lump-sum costs for system restoration arrangement and the costs for maintaining its operation during the operation cycle. An example of restoring the beam bearing capacity with the loss of stiffness of its supporting and middle span sections has been considered.

The Bearing Capacity of Compressed Corrosion-Damaged Reinforced Concrete Elements under Lateral Pulse Loading

“…In addition, relevant challenges accompany the development and application of the engineering method, taking into account the dimensions of the corrosion spot, the presence of two corrosion spots, secondary geometric imperfections, as well as other aspects that may affect the real technical condition of the columns in the aggressive medium. The LCBC approach can be effectively applied to evaluate the stress-strain state within the framework of optimization algorithms applied to bearing structures [36][37][38] in the case of repeated calculations and changing parameters.…”

Vibration characteristics and seismic performance of historical buildings with brick-wood structures

“…They are of great heritage and aesthetic value. In recent years, numerous experts and scholars have researched and studied historical buildings from various perspectives, compiled a host of valuable technical data, and repaired some historical buildings with structural defects, providing strong technical support for the preservation of these buildings [3,7,8]. However, regarding the preservation of historical buildings, scholars have long been attaching importance to architectural art, ignoring structural performance.…”