Each line of vertical elements of the lateral forceresisting system complies with the allowable story drift of. Maximum allowable drift ranges from h50 in some codes to h2000 in others, where h is the height of a building. Instructional material complementing fema 451, design examples seismic load analysis 9 17 1a, 1b stiffness soft story irregularity vertical structural irregularities irregularity 1a exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above. Lanl engineering standards manual std342100 chapter 5 structural. The allowable drift of other structures with risk category i and ii is approximately 10 times the allowable drift under wind forces. Community college buildings regulated by the division of the state architectstructural safetycommunity colleges dsass. This 2006 international building code is a ed work owned by the. Minimum design loads for buildings and other structures. Toppings of concrete or similar materials are not placed over wood structural panel diaphragms except for nonstructural toppings no greater than 112 inches 38 mm thick. The author strongly suggests to have you a full copy of asce7 and ibc 2012 design codes when doing a seismic analysis. Vertical lfrs elements limited to lightframed walls w wood panelor. Seismic forceresisting systems that are not contained in. Asce 705 contains specific requirements for nonstructural components.
There is a considerable uncertainty regarding the evaluation of the maximum allowable story drift as well as the maximum allowable lateral drift at the top of a building. Combined deflections of diaphragms and shear walls shall not permit story drift of supported masonry or concrete walls to exceed the limit of section 12. The scope of this code covers all buildings except 3 story one and twofamily dwellings and townhomes. This is done to avoid comples stiffness calcaulations. Comparison of egyptian code 2012 with eurocode 820, ibc. This publication provides explanations and guidance on how to use the asce 705 standard in conjunction with the 2006 ibc as well as thorough discussion of the changes in the updated material standards referenced e. International building code, new jersey edition, 2006. Estimation of the maximum allowable drift at the top of a. The period formula can then be given as 7 cwshcfsince the code cp is related to 1 at, the formula variables reduce to the building drift coefficient and the building height. The following is intended as a useful short checklist for.
Rigid diaphragms are addressed in ibc section 1604. As you noticed, this table shows us values in fraction format. Vertical elements of the lateralforceresisting system are lightframed walls sheathed with wood structural panels rated for shear resistance or steel sheets. Drift limitations in a shear wall considering a cracked. Combining nominal loads using allowable stress design. The ibc 2009 requirements mentioned herein that are new since the ibc 2006, and significant i. Example 4 uses story drift ratios instead of story stiffness. Looking for published interpretations by icc, local jurisdictions, icc chapter, etc that relate to the 2006 international building code ibc. Estimation of the maximum allowable drift at the top of a shear wall within elastic limits m. Evaluating the maximum allowable drift in a shear wall with variable stiffness. The section numbers reference the 2006 edition of the ibc. Utilized by structural and civil engineers, architects, code officials and students, the comprehensive guide contains many examples covering a large variety of problems addressing both structural and seismic issues.
In my opinion, in many cases, the said substitution does not yield accurate results. The international building code 2006 swimming pools, spas and hot tubs section ag102 definitions swimming pool any structure intended for swimming or recreational bathing that contains water over 24 inches 610 mm deep. The most current building code enforced in most jurisdictions in the united states is the 2006 international building code. Lateral story drift is the amount of sidesway between two adjacent stories of a building caused by lateral wind and seismic loads fig. While the ibc includes story drift limits for masonry. Building drifts in etabs civil engineering community. Assembly a1 a2 a3 a4 a5 business educational factory f1 moderate f2 low institutional i1 i2 i3 i4.
This barcode number lets you verify that youre getting exactly the right version or edition of a book. Allowable story drift aisc steel construction code. The allowable story drift should be greater than or equal to the design story drifts for each floor level. When the msjc code is used in conjunction with a building code that does not contain allowable story drifts, the provisions of asce 7 are used. Griffis introduction the increasing use and reliance on probability based limit states design methods, such as the recently adopted aisc lrfd specification,1 has focused new attention on the problems of serviceability in steel buildings. Pdf evaluating the maximum allowable drift in a shear. Allowable story drift joshplumse structural 19 sep 08 11. Risk category iii and iv structures have more stringent drift limits to ensure better performance of the structure and serviceability after a seismic event. The international codes icodes are the widely accepted, comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe, sustainable, affordable and resilient structures. Pdf interstory drift, the relative translational displacement between two consecutive. Route 3 requires b allowable stress calculation, d story drift limitation, and g ultimate. Cross reference ubcibc nonstructural 1997 uniform building code 2006 international building code 6 307. This would also be beyond the code commentaries by icc. For each story, the area of the occupancy shall be such that the sum of the ratios of the actual floor area of each use divided by the.
For structures assigned to sdc c and higher that include columns, pilasters and beams, and that are part of the seismic forceresisting system and support discontinuous masonry walls, ibc section 2106. Furthermore, it brings to consideration the value of the story. Allowable story drift structuralintl bldg and residl. Introduction to earthquake engineering and seismic codes in. The 2000 ibc handbook, structural provisions my latest copy of same has an example where the 1st story height is 17. Khouri department of civil engineering, lebanese university, lebanon abstract there is a considerable uncertainty regarding the evaluation of the maximum allowable story drift as well as the maximum allowable lateral drift at the top of a building. The story drift is calculated as the relative elastic displacement of a story to the story below, as shown in figure 1. No mention of minimum guard rail height of 36 inches above floor in r3 occupancies. Chapter 12 seismic design requirements for building. This includes inground, aboveground and onground swimming pools, hot tubs and spas. Horizontal deflection of a wall refers to its horizontal movement between. The 2003 international building code ibc requires that the contribution of panel zone deformations to overall story drifts be included in the mathematical model of the physical steel moment.
The following information related to wind loads shall be shown, regardless of whether wind loads govern the design of the lateral forceresisting system of the structure. The following is intended as a useful short checklist for use of the international building code for the design. Trying to determine the required occupancy separation between the two occupancies, as required by section 508. The story drift is calculated as the relative elastic displacement of a story to the story below. Maximum allowable drift ranges from h50 in some codes to h2000 in others, where h. Concepts and applications of finite element analysis.
Ultimate design wind speed, v ult, 3second gust, miles per hour kmhr and nominal design wind speed, v asd, as determined in accordance with section 1609. When designing for earthquakes, the story drift the relative displacement of adjacent stories must be checked against the ibc prescribed allowable story drifts. Various seismic codes suggest values that range from h50 to h2000 where h is the height of a building. The allowable drift limits placed by asce 7 16, as shown in table 1, are functions. This 1105 value is story drift divided by story ht. The selected seismic forceresisting system shall be designed and detailed in accordance with the speci.
Why we need the irc, especially in the new cbc 2007, which is an adoption of the 2006 ibc and will become effective 01012008. The international code council icc is a nonprofit organization dedicated to developing model codes and standards used in the design, build and compliance process. Pdf evaluating the maximum allowable drift in a shear wall with. Dsasscc the scope of application of chapter 16 is as follows. Building code seismic requirements for architectural glass. For a single story building, lateral drift equals the amount of horizontal roof displacement. The 2006 ibcadaag comparison page 4 of 393 new adaag1 doj standards for accessible design2 2006 international building code3 the technical specifications 4. This comprehensive code features timetested safety concepts, structural, and fire and life safety provisions covering means of egress, interior finish requirements, comprehensive roof provisions, seismic engineering provisions, innovative construction technology.
Pdf a critical assessment of interstory drift measurements. Drift limitations in a shear wall considering a cracked section. Drift surcharge a n g l e note a 15% increase in the allowable capacity of wood for loads that include snow, which is a shortterm load snow loads 712 cs 0. Two story building, r3 on the second floor, m occupancy on the first floor. Asce 716 provisions for lateral drift determination. This invaluable resource provides a stepbystep approach to applying the structural provisions of the 2006 international building code. Structure magazine asce 716 provisions for lateral. First we need to convert it to delta m by multiplying it with 0. The provisions of this chapter shall govern the structural design of buildings, structures and portions thereof regulated by this code. Each line of vertical elements of the lateral forceresisting system complies with the allowable story drift of table 12.
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