2nd October 2019

decks

11

What is a flush beam on a deck?

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A flush or header beam is a structural member positioned at the same level as the joists and uses joist hangers for attachment just as you would at the ledger board. Flush beams are commonly used for framing angled deck forms such as octagons or on stair landings where a cantilevered beam would be less practical.

Keeping this in view, what is an upset Beam?

Upset Beam -- This is a type of flush beam used when supporting an upper wall or structural element where the beam extends above the upper floor surface. Used in line with walls, or in attics.

What does drop beam mean?

A girder, cantilevered or drop beam is a structural member positioned below the joists to support the weight of the frame. Cantilevered beams are stronger than flush style beams because they rely on the strength properties of the wood rather than the individual mechanical and fastener connections.

What is the hidden beam?

The Hidden beam is a means to describe the load dispersion on to supporting slab. Hidden beams are generally inserted within the suspended slabs where slab thickness is considerable. The Hidden beam is a virtual beam that was originated by some one to make use of the BEAM free head room.

1

How far can a pressure treated 2x6 span?

In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the deck, the larger the joists.

2

How far can you span a 2x8 beam?

When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on.

3

What is the span of a beam?

Span is the distance between two intermediate supports for a structure, e.g. a beam or a bridge. A span can be closed by a solid beam or by a rope. The first kind is used for bridges, the second one for power lines, overhead telecommunication lines, some type of antennas or for aerial tramways.

4

Is furniture a live load?

Live loads include any temporary or transient forces that act on a building or structural element. Typically, they include people, furniture, vehicles, and almost everything else that can be moved throughout a building. We measure uniform live loads as pounds per square foot (psf).

5

What is the span of a beam bridge?

Beam bridges are often only used for relatively short distances because, unlike truss bridges, they have no built in supports. The only supports are provided by piers. The farther apart its supports, the weaker a beam bridge gets. As a result, beam bridges rarely span more than 250 feet (80 m).

6

What is the strongest type of bridge and why?

The arch bridges bent more than either the truss or beam bridges. My hypothesis was incorrect. Overall the beam bridge appeared to be the strongest type, although the truss bridge was more rigid up until the point of failure.

7

Why is a beam bridge good?

In its most basic form, a beam bridge consists of a horizontal beam that is supported at each end by piers. The weight of the beam pushes straight down on the piers. The farther apart its supports, the weaker a beam bridge gets. As a result, beam bridges rarely span more than 250 feet.

8

What is the longest beam bridge in the world?

Lake Pontchartrain Causeway

9

Why was the beam bridge built?

Ancient Romans are famous for their arch bridges made of stone and concrete but they also begun with simpler bridge types. The earliest known ancient Roman beam bridge was built across the Tiber River in 7th century BC and was known as “Pons Sublicius” which literally means “bridge made of wooden beams.”

10

Are beam bridges expensive?

Beam bridges may be costly even for rather short spans, since expensive steel is required as a construction material. Concrete is also used as beam material, and is cheaper. However, concrete is comparatively not that strong to withstand the high tensile forces acting on the beams.

11

What are the advantages and disadvantages of an arch bridge?

Advantages of arch bridges. Inexpensive, with local building materials such as stone and brick, being used in the past. Today, concrete is more likely to be used. Wider distances can be spanned by building more arches.

12

How does an arch bridge work?

Instead of pushing straight down, the load of an arch bridge is carried outward along the curve of the arch to the supports at each end. The weight is transferred to the supports at either end. These supports, called the abutments, carry the load and keep the ends of the bridge from spreading out.

13

What is a tied arch bridge used for?

It can be considered a bridge between arch bridge and a suspension bridge. They work like arch bridges on one hand, because force of the load on the deck (thrust) is translated as tension to the curved top chord by vertical ties of the deck which try to flatten the arch and to push its tips outward into the abutments.

14

How does the Arch Bridge work?

An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side.

15

Why are cables on bridges?

In a suspended deck bridge, cables suspended via towers hold up the road deck. The weight is transferred by the cables to the towers, which in turn transfer the weight to the ground.

16

What makes the suspension bridge strong?

Most of the bridge's weight (and any vehicles on the bridge) is suspended from the cables. The cables are held up only by the towers, which means that the towers support a tremendous weight (load). The steel cables are both strong and flexible. This makes long span suspension bridges susceptible to wind forces.

17

Why did the Narrows bridge collapse?

The first Tacoma Narrows Bridge opened to traffic on July 1, 1940. Its main span collapsed into the Tacoma Narrows four months later on November 7, 1940, at 11:00 a.m. (Pacific time) as a result of aeroelastic flutter caused by a 42 mph (68 km/h) wind. The bridge collapse had lasting effects on science and engineering.

18

Why did Tacoma bridge fall down?

The Tacoma Narrows Bridge collapses due to high winds on this day in 1940. Fortunately, only a dog was killed. The Tacoma Narrows Bridge was built in Washington during the 1930s and opened to traffic on July 1, 1940. It spanned the Puget Sound from Gig Harbor to Tacoma, which is 40 miles south of Seattle.

19

Why did the Silver Bridge collapse?

The Silver Bridge was built in 1928 and connected Point Pleasant, West Virginia, and Gallipolis, Ohio. On December 15, 1967, it crumbled into the Ohio River during rush hour, killing 46 people without warning. It was determined that the entire bridge fell apart because of the failure of one single link.

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