Fierro part 4 20100118

January 20, 2010 by clperry
Filed under General Information, Structural

Fierro photos, part 3 20100117

January 18, 2010 by clperry
Filed under General Information, Structural

Fierro photos part 2; bldgs w/minor damage

January 17, 2010 by clperry
Filed under General Information

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: Broken window at top of photo; concrete and glass block appears undamaged.

: Minor damage to infill at lower right; otherwise appears undamaged.

: Concrete collapse in foreground but these dilapidated wood structures show little sign of earthquake damage.

: Unreinforced masonry; no sign of damage.

: 5-story building with masonry arches at bottom and top floors; no sign of damage even though pounding evident with lower bldg on right. Other unreinforced masonry structures in photo on right; undamaged.

: 2-story corner building with minor damage to infill; buildings on either side collapsed. Construction extending out over sidewalk very common. Note additional wood structures still standing at left.

: 2-story corner building; view showing collapsed structure on right. Yellow structure down the street seen in next photo.

: Concrete and masonry construction; open front at street with cantilever over sidewalk and no apparent damage.

: Concrete shear cores at both left and right; building appeared undamaged except for cosmetic damage to architectural cladding beneath the windows.

: Construction site showing very light reinforcing for concrete column.

: Street scene where most buildings appear to be standing.

: Two examples with small columns out to edge of sidewalk and recessed infill wall with openings; no sign of damage even though structure in the middle collapsed.

: Unfinished 1-story confined masonry bldg; close column spacing (est 8′). No damage, no cracking visible. Note bars for 2nd story very light with widely spaced, open hoops.

: 2-story bldg open at first floor; concrete utility pole at right. No sign of damage.

: Vintage corner building with minor damage to infill. 4-story unfinished confined masonry bldg with recessed wall at base; appears to have some broken glass but otherwise no sign of damage.

: 2-story confined masonry corner bldg with cantilevers along both street fronts; minor damage to infill at left. HVAC equipment and antennae on roof appear intact.

: Canopy at gas station; no sign of damage.

: Communications tower; no sign of structural damage.

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Fierro photos, general, bldgs w/heavy damage

January 17, 2010 by clperry
Filed under General Information, Structural

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Recent construction (est. 5 years old). Collapse at 1st-2nd floors; light concrete frame with masonry infill.

: Landslides common on slopes around Port-au-Prince; many rubble or unreinforced masonry retaining walls failed.

: Partial collapse of unreinforced rubble stone retaining wall.

: Downed utility pole due to landslide; power lines and transformer down with oil and PCBs leaking on roadway.

: Overview of devastation of hillside shanties. Landslides may have contributed to collapses near center of photo; construction at upper right on wider terraces appears intact.

: Presidential Palace in Port-au-Prince. Much of first floor still intact with windows unbroken; complete collapse above first floor.

: Presidential Palace. Building E-shaped in plan; very light reinforcing evident in failed columns near entry.

: Recent construction (est. 5 years old). Collapse at 1st-2nd floors; light concrete frame with masonry infill.

: Recent construction; close-up of inadequate reinforcing in columns at top floor.

: Collapsed corner building; structures on either side intact.

: Collapsed corner building; close-up of smooth hairpin reinforcing bar.

: Collapsed corner building; undersized smooth bars.

: 5-story confined masonry building; collapse due to soft 1st story, short columns at 2nd story, and perhaps inadequate splices of column bars.

: 5-story bldg; close-up of 2nd and 3rd floor beam-column joints without shear reinforcement (2nd flr joint and much of 2nd floor column intact with shear crack indicating top of masonry infill; appears all column bars spliced at 3rd floor joint).

: Close-up at joint. Note smooth column bars, deformed beam bars and no hoops.

: 4-story unfinished concrete building collapse; leaning on adjacent structure. Failure due to open front, undersized columns, heavy slabs, and inadequate reinforcing.

: 4-story collapse; close-up of corner “column” at 2nd and 3rd floors.

: 4-story collapse; close-up 3rd story beam-column joint showing small, smooth bars and no hoops. Appears column bars may be lapped in the joint (see tie wires).

: Collapsed 2- or 3-story reinforced concrete building.

: Unreinforced masonry building with mix of brick, concrete block and rubble stone. Appears 2nd story collapsed.

: Front view of collapsed Port-au-Prince Cathedral; towers collapsed. Remains of steel framing evident at base of left tower.

: Cathedral collapse; many columns and wall sections still standing but roof completely collapsed. Note steel framing in wreckage and unusual reinforcing in dangling columns.

: Cathedral collapse; dangling column.

: Cathedral collapse; close-up of flat bars (est. 1/16″x1″) used to tie longitudinal steel together. Wikipedia says cathedral built between 1884-1914; dedicated in 1928.

: Street scene showing collapse of downslope buildings at left; buildings at right all intact.

: Unreinforced masonry building with mix of brick and rubble stone. Front wall still standing but daylight visible through window at left indicates roof collapsed.

: Concrete and masonry at 1st floor with wood framing and corrugated metal panel siding above. Building still standing in spite of collapse of front and side wall and missing floor. This structure independent from concrete and masonry building at right.

: 2nd floor column damage; columns restrained by concrete handrail (short columns) and one damaged by pounding from stairway of adjacent building.

: Close-up of short column failure. Bars undersized, smooth, and no sign of hoops. Suspect use of beach sands in concrete may contribute to corrosion.