Implementation of digital twin and support vector machine in structural health monitoring of bridges

Abstract

Taking into account the numerous previous attempts to use waste glass for concrete production, an approach was proposed based solely on car side window glass waste. Only side window waste emerging during the production of car side windows was used during the research program. In this way, all key properties of the waste glass were under control (purity, granulometric properties, etc.). Two types of concretes with crushed side window glass, playing the role of coarse aggregate, were created. Concretes were differentiated by the amount of added crushed side window glass, which replaced 10-50% of the natural aggregate. Created concretes were thoroughly tested in the state of both a fresh mix and hardened composite. Consistency and air content of fresh mixes were tested. Slump was ranging from 15 mm to 20 mm and air content was ranging from 2.5% to 3.1%. Hardened composites were used to test apparent density, compressive strength, water absorption, water-tightness and resistance to freeze-thaw cycles. It was proven that concrete with side window glass as partial aggregate substitution is characterized by satisfactory mechanical properties (compressive strength after 28 days of curing was ranging from 51.9 MPa to 54.7 MPa), enabling its application as ordinary structural concrete. Properties of both fresh concrete mixes and hardened concretes based on crushed side window glass are similar to a reference concrete. It was proved that it is possible to replace up to 50% of natural coarse aggregate by crushed side window glass. Possible applications of the concretes in question were proposed. Experience gained during the research program is likely to be useful for tests of using crushed side window glass sourced from decommissioned cars and trucks. Areas where future research is needed are indicated.

Temporary Structural Health Monitoring of Historical Széchenyi Chain Bridge

“…Optical fibre and wireless sensing technologies have shown great potential and have been widely used in many SHM systems for bridges [19]. Nevertheless, the application of artificial intelligence is also emerging for evaluating measurement results [3,20].…”

Temporary Structural Health Monitoring of Historical Széchenyi Chain Bridge

“…Optical fibre and wireless sensing technologies have shown great potential and have been widely used in many SHM systems for bridges [14]. Nevertheless, application of artificial intelligence is also emerging in evaluating measurement results [3,15]. SHM systems are not only installed on relatively new structures; historical aging bridges are also involved [16,17].…”

Causes and analysis of position offset of curvilinear continuous beam bridge

“…Due to their large quantity and significance, the daily maintenance and repair work of these bridges deserve more attention [1][2][3]. Due to the fact that many of these bridges were constructed in the previous century and were limited by the technology available at that time, the design load standards and capacity to accommodate traffic are unable to meet the current demands [4]. Currently, the funding for highway bridge construction in China is primarily allocated to the construction of large-scale bridges, while limited funds are available for medium and small span bridges.…”