การตรวจสอบความเสียหายทางโครงสร้างของคานคอนกรีต

A documentary-style close-up photo of a reinforced concrete structural beam displaying severe [shear cracking]. The scene captures the underside of an aging concrete building structure: one prominent diagonal crack runs from the lower left upward toward the upper middle-right across the beam face, accompanied by a secondary branching diagonal crack on the left-center, and three fine hairline vertical cracks on the right half. The concrete surface is rough, weathered, pale gray, pitted with small pores and aggregate marks, with darker grime and water staining near the ceiling joints. A supporting concrete column stands at the far left edge, with the bottom of the beam framing the lower view against a dim, out-of-focus industrial background of utility pipes. Diffuse, subdued site lighting like an engineering inspection photograph inside a parking garage or beneath a bridge. Straight-on medium close-up, sharp surface texture, engineering-inspection accuracy, no people, no signs, no overlaid text.