2003 Thesis Analysis of the Use of Alternative Construction Materials. 601 New Jersey Avenue Washington, D.C. By Amber House Structural Option Dr. Hanagan Table of Contents:

Executive Summary ……………………………………………………………. 2

Existing Conditions …………………………………………………………….. 3

Structural Depth ………………………………………………………………… 13 Slab Design ……………………………………………… 15 Columns …………………………………………………. 25 Design Impact Analysis Foundations ……………………………………………... 30

Architectural Breadth …………………………………………………………… 34

Construction Breadth …………………………………………………………… 42 Cost Analysis ……………………………………………. 42 Schedule Implications …………………………………… 48

Conclusions ……………………………………………………………………… 51

Acknowledgements ……………………………………………………………… 52

Appendices A.1 – Slab Design A.2 – Column Design A.3 – Column Impact Analysis A.4 – Foundations B.1 – Architecture C.1 – Cost Analysis Executive Summary:

It is obvious from the layout of the building on the site that there was much importance emphasized on using the plot of land to its fullest extent. Not only did the building have the limitations of horizontal barriers but for vertical barriers as well. 601 New Jersey, located in the mist of capital hill in Washington D.C., was restricted to a height of 110 feet for occupied spaces. The existing structural system, consisting of composite steel beams and columns, in the office portions of 601 New Jersey Avenue, occupies approximately 24.5 inches of the floor-to-floor height. This thesis report focuses on reducing the space that the structure occupies, by changing the material used for the design. It then looks at the effects of this new structural system and its implications on other parts of the building and construction process in particular its foundations, columns, architecture, schedule and costs. Other systems of the building are noted as well but not as in-depth as the previously mentioned parts of 601 New Jersey Avenue. The system that was chosen for this report to replace the existing steel structure was a two-way concrete slab. Through this change 14 inches were gained in the floor-to-floor height. Without any ceiling height changes, other than on the first floor of the structure by a mere 4 inches of the 10’7” existing ceiling height, a tenth floor was able to be added. This in turn produced approximately 28,500 of new rental office space. There is a square foot limitation on the site however it will be ignored for the purpose of this analysis. The thesis report will include an existing conditions section, that will cover details about the structure and other systems found at 601 New Jersey Avenue. It will also include some of the architectural features of the building as well as the layout of the sites. Next the focus will be placed on the design of the new structural system, including the slab, columns and foundations. Attention will also be directed to an impact analysis of columns at the sub grade garage level of the structure. Afterwards the effects of this system on the architecture of the building will be analyzed though three-dimensional modeling focusing on the impact of the columns on the space and its flexibility and function. Investigation into the affects of these columns to the garage levels will also be discussed. Finally the influence of this design on the schedule and the cost of the structure will be reviewed. Overall though this thesis report, the design of this system was found to be an appropriate choice for consideration by the owner. There were no systems that caused particular concern and the overall cost benefits were more favorable for this design then the current steel design. The schedule discussion revealed that the construction of the concrete structure would not necessarily delay the completion of this project however the impact of the addition of a tenth floor on the construction time was noted. The columns in the open space were found to cause some difficulty in the layout of the office furniture; however it was no more difficult than working around the odd shape of the building. Finally the increased sizes and the rearrangement of column locations led to the loss of several parking spaces on the garage levels, nevertheless the building still meets the onsite parking requirements imposed by the city of Washington D.C. The topics mentioned above are found in greater detail throughout this thesis report.