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AW At* .w A 4w AM AW AW AM AW ow AW AW Am Am AM AM AM AM ,M AW ,.w 4w AW 4k ok G I B B L E NORDEN CHAMPION 7. Provide matching masonry shear walls and footings in basement to correspond with new shear walls from I" to 2" floor. 8. Consider isolating each dorm from one another at front entry/passageway (weak link = failure). AM 4^ n "* Comstock and Wilder Dormitories Page 7 of 7 Smith College, Northampton, MA. ow- AW AW A AW AW AW A AM A AM Am AW Am Aft AIW ..Q 40 AW AM A* AW AM .ft AW 4W G I B B L E N (DR DEN �w CHAMPION „ STRUCTURAL RECOMMENDATIONS Preliminary calculations indicate that the following structural improvements are required to meet the requirements of Chapter 34 of 780 CMR 6`h edition. The following recognized references were followed: FEMA — 178: NEHRP Handbook for the Seismic Evaluation of Existing Buildings FEMA-273: NEHRP Guidelines for the Seismic Rehabilitation of Buildings. FEMA-274: NEHRP Commentary to FEMA-273. Structural Clay Products Institute: Brick and Tile Engineering Design Handbook. The following should be considered in the design and renovation process: 1 . A new diaphragm (plywood) should be installed at all attic levels. Install cross wall plywood shear walls. Attic corridor walls should be extended to the roof as bearing/shear walls. 2. New ties from all floors to exterior walls will be required. Clip angles and embedded/grouted anchors to the clay tile walls at approximately 4' o.c. will be required. 3. Dorm room divided walls (transverse walls) need to become plywood shear walls. Install 1/2” cdx sheathing to one side and replace finishes. Provide hold-downs at each end of each wall. 4. Add new single layer of 3/4" plywood to all floors for new diaphragm. May be installed below after plaster ceiling is removed. 5. Provide continuous connection of new plywood diaphragms to new dorm Ak shear walls with continuous light gage angle and screws. (Size and spacing to Ak be determined.) 6. Due to accumulation of shear loads to below 2"d floor, provide new masonry shear walls in transverse direction at or near existing wall locations. Provide new plywood diaphragm between new shear walls (2"d floor joist/1" floor Ak ceiling). Provide hold-down collector beams below 2"d floor to new masonry shear walls as needed. Comstock and Wilder Dormitories Page 6 of 7 Smith College, Northampton, MA. G I B B L E NORDEN Ak CHAMPION W. iii, There are no P/C structural ok elements in the project. d.) 3408.6.4 Existing Unreinforced Masonry (URM) Walls: 4k Existing URM walls allowed if: ,. i. adequately tied to the structure for lateral support. ii. h/t or w/t <_ 20t. iii. of sufficient strength to meet 1612.7 Architectural Components a•• and Systems (seismic design considerations). Also, URM shear walls permitted by 3408.3.5 by excluding detailing ft requirements of Chapter 21, Masonry. "* e.) 3408.7 Liquefaction Evaluation for Existing Building: The requirements of 1805.3 Liquefaction will be checked using site surficial maps or soil borings if necessary. No problem is anticipated at this time. AM Comstock and Wilder Dormitories Page 5 of 7 Smith College, Northampton, MA. AOW AW 40 Alm AM A 4m AM Am AOW Aft .M A .W AOW Alft .. oft Am w► we Ak AOA .m ift G I B B L E NORDEN CHAMPION 6.) 3408.6: a.) 3408.6.1 R-Factors and Force Modification Factors for Existing Construction: i. Use R-Factor from Table 3408.2 with force equations from Chapter 16: Use R == 4.0 for wood systems for light framed plywood shear walls 3 stories or less (transverse). Use R == 1 .25 for unreinforced ,. masonry (URM) bearing wall system (longitudinal). ii. 3408.6„1.2 Earthquake Design Force: -fake a 25% reduction in seismic design force when not extending the building in height or area. b.) 3408.6.2 Existing Rigid Elements in Earthquake Analysis: This section does not apply as required lateral load resistance is controlled by *! 3408.3.5. c.) 3408.6.3 Reduction of Earthquake ,f, Hazards: i. There are no parapets in the project. ii. All masonry wall to diaphragm connections will be improved to provide a minimum of 100 lbs./ft. capacity or as required by lateral design. Comstock and Wilder Dormitories Page 4 of 7 Smith College, Northampton, MA. AM AIW lw .w Am A 4w ow AOW ®.. AW .w w Alk Am A w Aft Aft 4m A Am Aft 4m Am 4, Aft- . w AM Mk ' G I B B L E NORDEN CHAMPION „,t 2.) 3408.3.2 Existing structural Members and Systems: Use current accepted engineering standards with actual material strength or applicable design code at time of original building construction (except for earthquakes). 3.) 3408.3.4 Lateral Load Analysis: Use actual member properties with new code requirements (Chapter 16) for lateral distribution but with forces per 3408.6.1 4.) 3408.3.5 Existing Lateral Load Capacity: a.) Alterations can not reduce element/systern capacity unless analysis shows conformance to 3408.3.4. b.) Existing elements/systems can be reinforced and/or replaced. c.) If lateral system does not meet detailing *" requirements of chapters 19 to 23, must satisfy section 1612.4 but with forces modified by Tables 3408.2 and 3408.3. — 5.) 3408.5 Earthquake Loads: CA-1 a.) Seismic Hazard Category 2 with no change in use group but alterations 3 q g4, 3 exceeding 509/0 of the assessed value. ag 3•.S z4 pow AL. b.) Building to comply with 3408.5 and �� check for earthquake hazards under: 6-0,5- /60 8 3 ,-(6I 3408.6.3 - unreinforced parapets `/ - diaphragm to wall connections - P/C element connections Comstock and Wilder Dormitories Page 3 of 7 Smith College, Northampton, MA. rs .., Ak AW AM AIM ow Alk Alk AW, AM Am AM ,.t AM AW AM A AM Ak .l ,m A.w Ak Am .► wW .A .w G I B B L E NORDEN CHAMPION 780CMR CHAPTER 34 REVIEW The following outline is progressive through Chapter 34 section numbers with corresponding comments that applicable to this project: A. 3400.2 Compliance: AM Building to comply with 780CMR 34 or code for new construction or request compliance alternative as allowed) and reviewed by building official. B. 3400.3 Applicability: 3400.3.8 Alterations within use Group R to comply with code for new construction except earthquake requirements need only conform to 3408. w C. 3408 Structural Requirements for Existing; Buildings: 1 . 3408.1.2 Buildings constructed before January 1, 1975 use code for new construction or 3408. 2. 3408.1.3 P.E. to perform designs required by 780CMR. 3. 3408.2 Structural engineer to evaluiate existing structure and prepare report to be submitted to building official. Am a. 3408.2.1 Includes field investigation, structural analysis, field observation during construction and geotechnical explorations. �w b. 3408.3 General Structural Design Requirements 1 .) 3408.3.1 New Structural Members and Systems: For new members/systems use code for new w construction with loads/criteria from 3408. Comstock and Wilder Dormitories page 2 of 7 Smith College, Northampton, MA. AM AW AM A AM Ab .► A. ANk Alk .. AIW AM AM AM AIM AM A Aft Alk 40 Aft Am Aw► Ak AM Alk G I B B L E NORDEN CHAMPION INTRODUCTION The purpose of this report is to outline the results of a preliminary structural review of the Comstock and Wilder Dormitories (c.1930) at the Smith College campus in Northampton, MA. The college plans to undertake ai; alteration and renovation project in the near future to provide modern improvements to this two-dorm complex. This report is a preliminary summary of the structural requirements set forth in the 6`h Edition of 780CMR Chapter 34, "Repair, Alteration, Addition and Change of Use of Existing Buildings". It is meant to serve as a planning guide for the college and the design/construction consultants. The physical and cost implications of the required structural work, as outlined in this report, should be considered during the planning and early design phase of the renovation project. GENERAL STRUCTURAL DESCRIPTION ' ► Ames and Dodge of Boston, MA designed the two-dorm complex. Design drawings, including foundation and superstructure plans, are available and dated May 17, 1929. Each dorm wing is a 3 story structure some 43 ft. x 173 ft., with an ell and a kitchen wing which is 1 '12 stories measuring 36 ft. x 115 ft. Generally, each building structure is in good condition and the as-built construction appears to conform to the design structural drawings. See Appendix A for basic existing building plans. Each building is a bearing wall structure with the exterior walls composed of bonded brick and structural clay tile (SCT). The interior walls, including corridor- bearing walls, are stud framing with plaster finishes. The floors are 2x repetitive timber joist framing with tongue and groove decking and finish plaster ceilings. Some small areas over mechanical spaces have concrete slab framing. The foundations are poured, cast-in-place concrete with conventional spread footings. Each dorm has an attic with joist framing identical to the 3`d floor framing below. The roof is pitched with timber rafters, wood tongue and groove decking and slate shingles. The buildings are laterally braced by the large number of dorm room divider walls in the transverse direction (N/S) and by the long exterior brick/STC walls in the longitudinal direction (E/W). The first floor level has fewer dividing walls, as the spaces are more open to accommodate larger living rooms, dining rooms, parlors and study areas. There is a full basement throughout with steel carrying beams below the corridor walls supported on steel columns. Comstock and Wilder Dormitories Page 1 of 7 Smith College, Northampton, MA. D I B B L E NORDEN CHAMPION .11`J 2 1 2001, COMSTOCK & WILDER DORMITORIES SMITH COLLEGE NORTHAMPTON, MASSACHUSETTS �l DORMITORY RENOVATIONS 780 CMR CHAPTER 34 STRUCTURAL ANALYSIS AND RECOMMENDATIONS JANUARY 19, 2000 �w PREPARED BY: JAMES F. NORDEN, P.E. GIBBLE NORDEN CHAMPION CONSULTING ENGINEERS INCORPORATED ,,w OLD SAYBROOK, CONNECTICUT Phone: (860) 388-1224 - Fax: (860) 388-4613