706 Madison Avenue
706 Madison Avenue, New York, NY 10065
Yong Yue
Structural Option
Structural Depth
Upon completion of the initial analysis of 706 Madison Avenue, based on the information indicated in the previous reports, the current designs of the building have been proven to be sufficient to meet all necessary strength, code, and serviceability requirements. Additionally, the building meets the historical requirements.
The addition has been designed literally to meet owner’s request that was to have a commodious room for retail use. The request has been fulfilled by eliminating interior columns and using transfer girders; however, the space in the addition is not capacious enough to be used efficiently for retail use. As shown in the typical floor plan in the previous reports, the area on the left is kind of narrow and wasted. Moreover, due to use of the transfer girders, the structural layout of the floors are irregular. It causes the structural design of the building impossibly having an alternative solution.
To continue to fulfill this request and pursue an alternate design solution, some design constraints must to be relaxed. My proposal is to have a reconstruction of the whole building as opposed to an addition of two separate buildings. The façade of existing building will be preserved in order to meet the historical requirements and Landmark Preservation Law. In addition, the spring 2017 will propose one-way slab concrete system rather than structural steel for consideration of durability, finical saving, resource efficiency and energy efficiency.
The original walls between two buildings will be eliminated in the redesign of the building. Two column lines will be added in E-W direction and four column lines will be added in N-S direction. The columns are distributed uniformly. The 23’ x 27’ new typical bay size and concrete flat slab gravity system will be utilized for the redesigned structure. Preliminary beam and column sizes will be explored further to meet strength and serviceability requirement. For the lateral force resisting system, reinforced concrete moment frames will be utilized in the similar location where existing steel moment frame were. The facade of existing building will be temporarily supported during the construction and the pitched roof will be moved off and reuse at the end of the construction.
Historic Façade Preservation (Facadism) - Construction Breadth
The construction of temporary structure to support the historic facade will be conducted in this breath. In order to preserve the façade of the building, the critical path of construction will be altered. The method and material of the temporary structure will also be discussed. Due to the new critical path of construction – in addition to the new cost of material and labor - might affect the overall project cost. Cost and schedule analysis will be used to determine the feasibility of the proposed project.
Building Enclosure - Mechanical Breadth
A facade investigation and alternate facade proposal will be executed in the building enclosure breath. An efficient facade design is based on both the mechanical property and the structural property. The mechanical property analysis consists of thermal and moisture consideration and the structural property analysis includes the earthquake consideration. Both of the analysis will be conducted in response to the proposal of an alternate enclosure system. In addition, the facade of the addition will be designed to coordinate with the preserved facade.
MAE Coursework
The redesign of the gravity force resisting and lateral force resisting systems of the proposed concrete structure will require the execution of three-dimensional modeling. The three-dimensional model will be constructed in Etabs, which have been learned from AE 530 – “Computer Modeling of Building Structures.” SAP will also be utilized to verify a two-dimensional structures. Modeling the building in three dimensions will provide a greater understanding of building behavior and the outputs from it can be utilized to verify manual calculation. Additionally, coursework from AE 538: Earthquake Resistant Design of building will be used to provide seismic reinforcing detailing for the concrete moment frames.