In the present work, structure health monitoring (SHM) of welded steel pipes was used to diagnosis their state via vibration based damage detection techniques. The dynamic quantities such as Frequency Response Functions (FRFs), mode shapes and modal parameters from structural vibration to detect damage were measured, set on linear averaging mode, with a maximum frequency of analysis of 3.2 kHz....

Reinforced concrete pipe (RCP) has been one of the most common pipes for medium to large diameter utility systems including sanitary sewer, and storm drainage systems. RCP typically has superior structural properties combining high compressive strength from concrete and tensile strength from reinforced steel. RCP tends to deteriorate over time due to hydrogen sulfide (H2S) gas in sewage and man...

Pressure waves, while traveling along pressurized pipes, collect precious information about possible faults (e.g., leaks and partial blockages). In fact, the characteristics of pressure wave reflected by fault are strongly related to it. To encourage use transient test-based technologies (TTBTs) for blockage (PB) detection in pipe systems, it can be interest critically analyze available experim...

A chemo-mechanical model is presented for the simulation of biogenic sulphide corrosion in concrete sewer pipes. The chemical formulated terms a system coupled diffusion-reaction equations, which describe processes calcium hydroxide dissolution, silicate hydrate dissolution and gypsum formation. problem two-way with mechanical that captures damage caused by deformations, set numerical analyses ...

The advent of dry point transducers has allowed new possibilities for ultrasonic testing of concrete structures and rock specimens. Recent developments in the technology such as single and multi-channel ultrasonic pulse echo technology and the automated determination of the modulus of elasticity have been pushing back the boundaries of the method. The effect of this has been to increase the eas...

the use of solar collectors in combination with heat pipes is rapidly growing in recent years.heat pipes, as heat transfer components, have undeniable advantages in comparison with other alternatives. the most important advantage is their high rate of heat transfer at minor temperature differences. although there have been numerous studies on the heat analysis or first thermodynamic analysis of...

The corrosion of rebars in reinforced concrete structures cracks the concrete, which leads to degradation bond strength between rebar and concrete. Since deterioration can menace structural safety, evaluation is essential for proper maintenance. In this study, authors investigated by conducting pull-out tests on specimens, with induced crack width stirrups ratio being principal parameters. An e...