Skeleton Construction System

After the analysis on the first design brought to light the zero for members, it was decided that these members should be removed. In order to combat the flex of such a simple design the decision was made to double the thickness. This design would have the same outer frame of two triangles with a height of 20 centimeters and a width of 40 centimeters. Instead of being spaced five centimeters apart the wood be bonded directly together using Gorilla Glue. Balsa wood, a very lightweight wood with properties similar to a dense foam, was used for the main supporting member. Basswood, a lightweight yet firm wood, was used for the horizontal member. The final design added a triple layer sheet of balsa wood to rear side of the truss. This balsa sheet was added for the purpose of mounting and supporting the main structure. Additionally, a five centimeter square frame of bass wood was added at the end of the boomilever to place the loading block for testing. Once this design was implemented two key issues were discovered. First, due to the properties of the bass wood and balsa wood it was obvious that the placement needed to be reversed. The bass wood should be used for the hypotenuse and the balsa wood should be used for the

Bolted steel construction: this is when the main bulk of the construction is pre made at the workshop then bolted into place on site. This tends to be the preferred methods as it saves time and money as well having the right working conditions.

The elements of this design is curved, flowing, angular and thick. The curvature of the walls offer support to the roof, although that is not the

Stability and balance is also achieved through the incorporation of the vertical and horizontal planes. In the southwest facade of the building the vertical slits are balanced with the horizontal planes created by the cubes, cornice and the ornamental horizontal band that runs halfway through the walls. These vertical and horizontal planes further dictate a rhythmic continuity throughout the building. Building's scale is rather modest in comparison to its site and the surrounding landscape and the smooth texture of the facade helps its integration to the environment. (Figure 4)

ACI 318-63 requires that the minimum ratio of longitudinal bars shall be at least 1.0%. Also, The vertical center-to-center spacing of the lateral ties shall be one of the smallest of: (1) 16 longitudinal bar diameters to restrain longitudinal bars from buckling, (2) 48 tie diameters to ensure sufficient tie area to restrain the lateral displacement of the reinforcing bars, and (3) the least lateral dimension of the column to develop the maximum strength of the concrete core. As shown in Fig. 1, The dimensions and steel reinforcement details of the columns involved in this experimental program were particularly selected to represent relatively older columns. In this experimental program, the longitudinal reinforcement ratio, ρl, was constant

The improvement of the skyscraper structures starts from 10 floor stories to high as 150 floor stories high. The Reliance Building Chicago, USA, in 1895, 15 stories high used the semi-rigid steel frame. The semi-rigid steel frame was held together with steel beams and connected by rivets. (Bennett, P.42) The 60 stories high First Wisconsin Center, Milwaukee, USA in 1974 employed the steel belt truss with framed shear truss. This structure used the horizontal trusses at the upper and lower stories to enhance the framed shear truss. (Bennett, P.44) The Sears Tower, Chicago, USA, in 1974, 110 stories high used the Bundled tube. The bundled tubes were made up of a cluster of connected frame tubes, reinforced by steel beams at each story to increase the strength of the structure. Various tubes terminated at different level to further strengthen the bundled tubes at the center. (Bennett, P.44) The future structure was the Superframe, which can reaches at least 150 stories high. It used the concept of the Eiffel Tower with framed tubes connected by horizontal trusses. (Bennett, P.45) It was the innovation of the structural design that enables skyscrapers to reach new height. These methods include the use of

The structure of the building is actually inherently modern, built using a conventional steel framing system inset behind the façade. Structurally, the building employs tube frames in its framework, with the tubular columns tied with trusses at the top and bottom. As with all architecture in the postmodern tradition of the “decorated shed, the superficiality of this signage not only fails to detract form its effectiveness but reflects a deliberate prioritization of architecture’s affective capacity.

We can see that loads are transferred from the trusses to the columns then into the foundation of the building. Engineers always assume that the loads are uniformly distributed through any building they design. I was impressed that the roof trusses are well design in the building, which shows a significant engineering work. The exposed features of roof trusses give its own uniquely design and show the glory of such engineering work.

The substructure units were constructed behind the existing interior piers, resulting in a span length of approximately 122 feet, which allowed traffic to remain uninterrupted with the exception of minor closures for erection purposes

3. Mortise-and-tenon system in which the wallboards are fitted into slots in the pillars, two freestanding posts at each end that support weight of the ridgepole or the beam of the roof’s crest

Slabs are loaded straight on end ranging with a width of 9 1/2" to 12", weighing up to 7,000 pounds a bundle.

At the fixings, they adapt to the needs. Generally, barriers are fixed in a frame by using screws. It is also possible to opt for a frame that is fixed with a pressure. In this case, there is a wheel that is necessary

Although these problems were corrected and the idea of building a skyscraper became a feasible task, there were many conditions that had to be taken into account, that did not need consideration when building a structure less than 40 stories tall. Four story buildings are supported by their own walls; however a new method needed to be created for skyscrapers since the previous building method would not provide enough support. Metal skeletal frames made of columns and beams were then developed to provide the support and strength needed for the skyscrapers. As the buildings grew taller, their structural design was made lighter and stiffer. Also, as the buildings grew taller, wind became an important issue. Normally, the force that acts on the skyscraper pushes directly downward towards the ground that would then counter balance that push. However, when an additional force acts on it, such as wind, the forces would act differently on the skyscraper. With a lateral force acting on the building, the steel columns of the frame on the windy side would stretch apart slightly while the columns on the other side would compress. Therefore, the skeletal frame built had to be made so that the structure would be free to move slightly with the wind and, at the same time, remain sturdy.

Superstructure bears the load that is being passed over the bridge and it transmits the forces caused by the same to substructure. Load received from the decking is transferred on to the substructure by Bearings. They also distribute the load evenly over the substructure material as it may not have sufficient strength to bear the superstructure load directly. Piers and Abutments are the vertical substructures which transfer the load to the earth in the foundation. Wing walls and returns are constructed as the extension of

The modules on the bottom layer are installed with the longer sides at right angles to the support beams. The module supports can be nominal 100 to 150 mm beams at 600 mm or 900 mm centres. This is possible due to the strength of