Residence Inn by Marriott, Stamford CT

Residence Inn by Marriott, Stamford CT

Images courtesy of BBGM.

DAVID A. WALENGA STRUCTURAL OPTION

AE SENIOR THESIS SPRING 2004

Residence Inn by Marriott, Stamford CT

DAVID A. WALENGA

STRUCTURAL OPTION



Project Team Developer/Owner: F.D. Rich Company Architect: BBGM Architects General Contractor: Haynes Construction Structural Engineer: Holbert Apple Associates MEP: Collective Design Associates, LLC Civil Engineer: Redniss & Mead, Inc.

Building Basics Size: 130,000 square feet, 164 room hotel Stories: 13 occupied above ground floors Cost: $27,000,000 including 404 space parking

Construction and Site Details ? Delivery method: Design-bid-build ? Construction timeline: January 2004 -June 2005 ? Site: zoned commercial, downtown Stamford

Images courtesy of BBGM.

Architectural Features ? Slender-wall cladding system with aluminum

framed punch windows. ? Cantilevered balconies on floors nine-thirteen ? Suspended mezzanine above ground floor ? L-shaped design, levels on short leg end at

5th floor.

Structural System ? Gravity system: steel framed structure with 8" pre-

cast concrete plank slab with gypcrete topping. ? Composite steel construction on mezzanine level ? Lateral system: steel braced frames at stair and ele-

vator towers. ? Spread and mat footing foundation system ? Typical bays: interior 22'x22', exterior 22'x14'

Mechanical Systems ? Six RTU's with 3100 to 6600 CFM capacity ? Central air system: heat pumps per every 2 rooms ? 500 kW diesel fired emergency generator ? 750 kVA transformer delivering 208V/480V, 3 phase ? Wall mounted fixtures in guest rooms, recessed

downlights typical for halls and public areas

A

RESIDENCE INN BY MARRIOTT, STAMFORD CT

TABLE OF CONTENTS

ABSTRACT

A

EXECUTIVE SUMMARY

2

BUILDING BACKGROUND

3

Basic Building Information

3

Architecture

3

Original Structure

4

Codes and Design Standards

8

Structural System Cost

8

System Advantages and Disadvantages

9

DEPTH STUDY: FLAT PLATE CONCRETE SYSTEM

9

Design Goals

9

System Background

9

Code Change and Loads

11

Gravity System

17

Lateral System

22

Mezzanine Hanger Anchor

26

System Cost

26

System Advantages and Disadvantages

27

Conclusions and Recommendation

28

BREADTH STUDY: MECHANICAL REDESIGN

29

Original System

29

Redesigned System

31

System Advantages and Disadvantages

33

Conclusion and Recommendation

33

BREADTH STUDY: PROJECT SEQUENCING AND SCHEDULING ANALYSIS

34

Introduction of Topic

34

Steel Scheduling and Sequencing

34

Flat Plate Scheduling and Sequencing

36

Conclusion and Recommendation

38

FINAL COMMENTS

39

ACKNOWLEDGEMENTS

40

REFERENCES

41

APPENDIX

AE SENIOR THESIS

1

DAVID WALENGA ? SPRING 2004

EXECUTIVE SUMMARY

RESIDENCE INN BY MARRIOTT, STAMFORD CT

The Residence Inn by Marriott is a thirteen story hotel located in the heart of downtown Stamford, Connecticut. The Residence Inn features 164 guest suites complete with kitchenettes and comfortable sitting areas. Physically, the hotel is an "L" shaped structure with a step-in at the fifth floor and cantilevered balconies on floors nine through thirteen. The Stamford Residence Inn presents a unique situation: the construction of the building has been delay from January of this year to June of this year in order to redesign certain systems of the building to lower the hotel's first cost. Therefore, one of the main focuses of this thesis is to research ways to lower the cost of the hotel without lowering quality.

The focus of this report is devoted to analyzing and redesigning the hotel's structural system from a steel framed structure to a flat plate concrete system. Additionally, a redesign of the hotel's mechanical system is performed, and an analysis of the required scheduling and sequencing associated with flat plate construction and steel with precast plank construction is also analyzed.

Based on the results and analysis of the structural redesign, it is concluded that a flat plate concrete system is a more suitable alternative for the superstructure of the hotel. Taking into account the recent volatile cost of steel, the need for supplemental fireproofing, and high cost of precast plank the steel system is estimated to be almost six hundred thousands dollars more expensive than the new flat plate design.

The results of the mechanical redesign show that changing the original system of heat pumps to a system of packaged thermal air conditioners, PTAC's, would lower the system first cost but also lower the overall quality of the mechanical system. PTAC's are louder, more expensive to operate and require more maintenance than heat pumps, however, they would cost the owner about five hundred thousand less at first cost than the original system. It is concluded that changing to PTAC's would lower the quality of the hotel too much and that other options for lowering the cost of building should be entertained.

Analyzing the scheduling and sequencing involved with both the original and redesigned structural systems concludes that for this project and under the assumptions made that flat plate concrete requires considerably less preconstruction scheduling. It is also concluded that the construction of the flat plate system will interfere less with the start and progress of other trades than the original steel design.

AE SENIOR THESIS

2

DAVID WALENGA ? SPRING 2004

Residence Inn by Marriott, Stamford CT

BUILDING BACKGROUND

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