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A52 Challenge: Triangle composition
Attempted this one again since it's an abundance of triangles and the grass under the structure had been cut which allowed me to sit on the ground. Still not 100% perfect, but closer than my previous attempts. It's so hard to see it all on the tiny screen of my camera while on scene to get everything lined up. So I just have to do my best and see what I've gotten after I get all the way home.
Once it is exactly in position (and the other end of the girder also lines up with its resting spot) the crane lowers the girder the last few inches and it's down!
Once the girder is fully vertical, the crane lowers the block that supports the rigging that attaches to the bottom, center bracket. This allows the girder to be fully supported by the two lifting brackets that are anchored at the top flange.
This is an image of my Architectural Design 4 class model, which is made from wood, card board, steel rods, and iron cable. The project is about creating a Border Station between two imagined countries, each with contrasting ideologies, beliefs, and teachings. The design must also create harmony within contradiction. My two cases were Theism vs. Pantheism. The tall structure is called the 'Light Tower', were when light enters, it creates lighting effects that point to the sky. In this particular image, the steel-based structural system is shown, which consists of four main H beams at each corner, with diagonal steel cables and beam to prevent twisting and shearing movements.
Technical Information:
Camera - Panasonic DSLR DMC-L1
Exposure - 1/30sec at f/6.3
ISO - 100
Lens - Olympus Zuiko Digital 35mm f3.5 Macro
Focal Length - 35mm
Fliter - No
Teleconverter - No
Extension Tube - No
Flash - No
Tripod - No
Capture Time - 12:45pm
First responders from across the country were in Virginia Beach for a massive structural collapse training exercise hosted by the Virginia Beach Fire Department and Virginia Task Force 2. The annual School was held at the sprawling complex of crawl spaces and staged disaster zones representing different scenarios – things first responders have seen and experienced first-hand. This course gives urban search and rescue teams a chance to practice their skills. More than 160 people took part in the hands-on training lasting for 8 days with students coming from as far as San Francisco, California, Texas, Pennsylvania, Ohio, Delaware.
Photographs by Craig McClure
21227
© 2021
ALL Rights reserved by City of Virginia Beach.
Contact photo[at]vbgov.com for permission to use. Commercial use not allowed.
Arched and grooved (striae) slickensided fault surfaces, Sacsayhuamán, Cusco, Peru
GABELMAN, JOHN W. (1968): Structure and Origin of El Rodadero, Cuzco, Peru
Division of Raw Materials, U. S. Atomic Energy Commission, Washington, D. C. 20545
El Rodadero at Cuzco, Peru, is a diorite porphyry boss transgressing limestone. The outcrop is an arched slickensided surface, which in detail is a mosaic of smaller slickensided arches. Structural mapping disclosed that each arch caps a joint block. Prominent high-angle northwest and northeast joint sets form rectangular joint blocks. Toward the southern margin, the northwestern set is locally supplemented by east-west and north-south joints. Evidence for a low-angle joint set parallel to the roof consists of the slickensided surfaces and flow layering indicated by parallel plagioclase and ferromagnesian phenocrysts. Most bounding joints are strong open fractures often filled with hydrothermal products; interior joints are rare and tight. The top of each joint block is arched and slickensided identically. Each arch is a tight doubly plunging fold terminating at the bounding joint.
Arches are interpreted to have formed by the continued upward movement of still plastic interior magma after the capping border zone had partially chilled. Joints must have formed before the border zone completely solidified. The confinement of each fold to its own joint block suggests each block expanded independently upward in the mosaic of rising blocks. One block broke through the roof and became a breccia pipe. Differential movement between passive roof and active chilled border could have formed the slickensides. Slight north-eastern elongation of the boss chamber may have controlled the identical orientation of all major fold axes and slickensides.
CARLOTTO, V., CARDÉNAS, J. y CARLIER, G., (2011): - GeologÃa del Cuadrángulo de Cusco 28-s - 1:50 000. INGEMMET, BoletÃn, Serie A: 138.
El Rodadero de Sacsayhuaman, en Cuzco, Perú, es una apófisis de un stock cenozoico de pórfido diorÃtico con augita, intruido en lutitas, yesos y calizas del Albiense-Turoniense. Esta apófisis, de unos 200 m de diámetro, muestra superficies pulidas y acanaladas que cubren casi todo el afloramiento de diorita y constituyen una serie de resbaladeros naturales en forma de tobogán, de donde deriva su nombre.
El pórfido diorÃtico de El Rodadero es una roca maciza densa de grano fino y textura granular, distinguiéndose cristales de coloración oscura de augita y pequeños agregados de epidota, generalmente bastante alterados, de modo que la augita, la plagioclasa y la ortosa (escasa) están respectivamente reemplazadas por clorita, tremolita, epidota, prehnita, calcita y sericita. Los minerales accesorios están son titanita, apatito e ilmenita.
El origen de las estrÃas de El Rodadero es muy discutido, existiendo varias teorÃas, sin embargo, predominan las que proponen un fenómeno de espejos de falla por arqueamiento diferencial de los bloques entre la roca encajante y el borde del plutón.
El afloramiento es una superficie a modo de espejo de falla arqueado y estriado, que en detalle es un mosaico de espejos arqueados más pequeños. Cada espejo arqueado ocupa la parte superior de un bloque de fractura. Estos bloques están delimitados por una red rectangular de fracturas de orientación NW y NE. En el margen sur del stock se observa también que la familia de orientación NW está acompañada por fracturas E-W y N-S. Existe otra familia de diaclasas de bajo ángulo, paralelas al techo de la cúpula magmática, como demuestran los espejos de falla y una estratificación magmática de flujo, evidenciada por la orientación de plagioclasas y ferromagnesianos.
Las fracturas abiertas que delimitan los bloques están rellenas por materiales hidrotermales, pero las diaclasas internas son raras y están cerradas. Cada bloque culmina en un espejo de falla arqueado idéntico, cuya forma es la de un pliegue apretado cuyos flancos limitan con los bloques adyacentes.
El origen de las estrÃas de El Rodadero es muy discutido, existiendo varias teorÃas, sin embargo, predominan las que se deberÃan a un fenómeno de espejos de falla por arqueamiento diferencial de los bloques, entre las calizas y el borde del stock.
Se interpreta que los arcos se formaron por el continuo ascenso del magma interno, aún plástico, del plutón, mientras la zona marginal ya estaba parcialmente consolidada.
Las fracturas deben haberse formado antes de que la zona marginal solidificase por completo. Cada arco de fractura está confinado en un bloque, lo que sugiere que cada bloque se expandió independientemente dentro del mosaico de bloques ascendentes.
Uno de los bloques atravesó la cúpula del plutón y formó una chimenea de brecha magmática. Los espejos de falla arqueados pudieron originarse por la fricción entre la cúpula magmática pasiva y el bloque ascendente cuyo margen era todavÃa plástico.
El ligero alargamiento nororiental de la cámara del stock puede haber controlado la orientación idéntica de los principales ejes de pliegue y espejos de falla.
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Ironworkers, who are also certified riggers, attach the top of the turnbuckle to the one end of the spreader beam.
The Institution of Structural Engineer's Young Structural Engineering Professional Award - Winner Kayin Dawoodi. © Bridges to Prosperity (www.BridgesToProsperity.org)
The crane slowly lowers the girder, gradually moving it into the space below the steel H-beam where the edge of the girder will rest.
The turnbuckles are different lengths, because this girder is not an even, flat shape of girder. The rigging is all set up to lift the girder at the proper angle.
Once the top rigging is securely in place, the bracket is opened so that it can be pulled back from the girder and lifted away from this location.
White Sands Missile Range Museum
Not a flying saucer, this Balloon Launched Decelerator Test (BLDT) Vehicle was used to test the Viking Mars Lander Decelerator in a simulated atmosphere of Mars. The decelerator system included parachute deployment. The vehicle's structural configuration provided an external envelope which simulated the Viking Lander Capsule in order qualify the Decelerator in the wake of a blunt body similar to the actual Viking Lander Capsule.
The BLDT Vehicle was carried to high altitudes by a helium-filled balloon released at Roswell, New Mexico and drifted west with the prevailing wind as it gained altitude to approximately 120,000 feet (around 22 miles) as it reached White Sands Missile Range.
At this point the BLDT Vehicle was released from the balloon, action was initiated to start the vehicle spinning for stability, and solid rockets were ignited. The four rockets, observable on the bottom of the vehicle, propelled the vehicle upward on an arched trajectory to an altitude of approximately 135,000 feet (26 miles). The vehicle speed at this time was approximately 1.2 times the speed of sound. As it neared the peak of its arch, action was initiated to stop the spin, and an explosive charge was detonated which deployed a large parachute from a compartment in the bottom center of the vehicle. The vehicle then decelerated and floated to the ground where it was recovered
The vehicle displayed here was the second of four tested by NASA at White Sands Missile Range in July and August 1972. This one was launched on July 26, 1972. The entire test lasted almost three hours.
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This is the east side of the splice; ironworkers are ready and waiting on either side of the middle girder. That's the first one to be set.
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Dieter Bestyak, a civilian firefighter with the 835th Civil Engineer Squadron, performs a demonstration as part of the live structural firefighter?s annual required training at Ramstein Air Base, Germany, April 24, 2009. (U.S. Air Force photo by Senior Airman Amber Bressler/Released)
These are the first two "drop-in" or closure girders delivered to the project. These girders are used to close the gap between Pier 6 and Pier 5, once all the knuckle girders are in place. This will take place over the railroad trestle, so we'll have to wait until the Norfolk Southern Railroad can schedule an outage for our work.
Ironworkers work to set structural steel for the new eastbound GVV Bridge near Commercial Road in the Flats.
These structural supports were designed to mount instrument panels in a liquid natural gas facility in Australia. All 72 assemblies were fabricated from carbon steel with a hot-dipped galvanized finish. The dimensions are 68" x 82" x 10" and all assemblies underwent quality control inspection prior to shipment.
Historic Navajo Bridge over the Colorado River in Coconino County, Arizona. The 834 ft long bridge spans Marble Canyon approximately 467 feet above the Colorado River in the Glen Canyon National Recreation Area. The main span is a 616 ft steel three-hinge spandrel-braced deck arch. The bridge was completed in 1929 by the Kansas City Structural Steel Company and was the highest steel arch bridge in the U.S. when it opened. It was bypassed by a new adjacent bridge in 1995 and now serves as a pedestrian bridge.
The old Navajo Bridge was listed on the National Register of Historic Places in 1981 (NRHP No. 81000134 as the Navajo Steel Arch Highway Bridge).
The Navajo Bridge was designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers (ASCE) in 1998.
Historic American engineering Record (HAER AZ-28)
Here you can see the girder being centered in the slot between the timbers and then slowly moving toward the camera, so that the flange will sit on the smaller boards resting on top of the H-beam.
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Here's another angle on the plumbing access notch in the Sister wall. I love the clean line that now defines the basement wall in place of all the debris and deteriorating foundation wall.
What a difference. Do you like what you see? Contact Peak Structural at 303 243 3028 or www.peakstructural.com/