X hits on this document

Word document

DRAWINGS AND SPECIFICATIONS - page 6 / 41

108 views

0 shares

0 downloads

0 comments

6 / 41

one (1) percent reduction due to penetrations and connection detailing. The reduction in thermal performance must be calculated using the Isothermal planes method of R-value calculation.

C.

Moisture Performance:  The insulated concrete sandwich panels must be adequately designed  and constructed to prevent the growth of mold and mildew and the formation of frost or ice on any panel surface and must maintain inner-wall condensation potential below <Insert allowable moisture > oz./day/sq.ft. based on summer design extremes.  Provide calculations complying with the ASHRAE Handbook of Fundamentals – Theory of Water Vapor Migration and confirming the requirements for effective moisture condensation prevention.  

Full-thickness concrete and metallic connectors can have serious detrimental effects on the performance of sandwich panels.  If a panel manufacturer opts to use full-thickness concrete or metallic connections, consideration must be given to the effects those connections have on the panels and surrounding materials in the project. These negative effects can include concrete panel cracking and bowing induced by the constraint of the outer (thinner) wythe movement relative to the structural wythe.  Also, full-thickness concrete sections will allow condensation to form at the breaks in the insulation system, resulting in heating and cooling loss, moisture migration, inconsistent face appearance, coating failures on painted panels, and growth of mold and mildew.

D.

Structural Performance:  Provide architectural precast concrete units and connections capable of withstanding the following design loads within limits and under conditions indicated:

As a minimum dead loads include panel weight and the weight(s) of the materials that bear on them.

1.

Dead Loads:  <Insert applicable dead loads.>

2.

Live Loads:   <Insert applicable live loads.>

3.

Wind Loads:  <Insert applicable wind loads or wind-loading criteria, positive and negative for various parts of the building as required by applicable building code or ASCE 7, including basic wind speed, importance factor, exposure category, and pressure coefficient.>

4.

Seismic Loads:  <Insert applicable seismic design data including seismic performance category, importance factor, use group, seismic design category, seismic zone, site classification, site coefficient and drift criteria.>

5.

Project Specific Loads:  <Insert applicable loads.>

Show locations here or on Drawings if different movement is anticipated for different building elements.  If preferred, change deflection limits below to ratios such as L/300 for floors and L/200 for roofs.

6.

Design framing system and connections to maintain clearances at openings, to allow for fabrication and construction tolerances, to accommodate live load deflection, shrinkage and creep of primary building structure, and other building movements as follows: a.  Upward and downward movement of [1/2 inch (13 mm)] [3/4 inch (19 mm)] [1 inch (25 mm)].

Temperature value in first subparagraph below is suitable for most of the U.S. based on assumed design temperature of 70 deg. F (21 Deg. C).   Revise to suit local conditions.  Temperature data is available from National Oceanic and Atmospheric Administration at www.ncdc.noaa.gov.

Document info
Document views108
Page views108
Page last viewedThu Dec 08 02:17:36 UTC 2016
Pages41
Paragraphs1105
Words15599

Comments