minimum required directions for wind and earthquake loads

8/14/2019 Minimum Required Directions for Wind and Earthquake Loads

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Specification No. MEW/ZSROP/RO1 5ROC(1) - 39 Contractor's Initial & Stamp

5ROC.1.3 Civil/structural design parameters

5ROC.1.3.1 Design methodology

The Contractor shall adopt a design methodology which will identify all significant factors inthe design and ensure that proper attention is given to each factor at every stage in the

design process.

The Design Basis Statement shall also clearly state the American Standards (or where nosuitable American Standard exists the appropriate/specified British Standards or Codes of Practice) to be used for design and material specification applicable to the entire scope ofcivil works for the Contract.

The Contractor shall also prepare for the whole of the works and each discrete sectionthereof, Detailed Design Reports for submission in accordance with the contract. To allowthe Owner/Engineer adequate time to plan and complete review cycles of the variousreports, the Contractor shall prepare and issue, for acceptance by the Owner/Engineer, atimetable and register of the submittals required under the contract.

5ROC.1.3.2 Buildings, structures and foundation design loads5ROC.1.3.2.1 Loading

The following loads shall be considered in design. Where relevant, the appropriate codesand basic design parameters are also given below:

a. Dead All dead loading shall be in accordance with ANSI/ASCE 7-98 MinimumDesign Loads for Buildings and Other Structures and more specifically BS 648.The self weight of structure, floors, roofing, side cladding and internal partition wallswill be treated as dead loads. Fixed plant loadings shall be treated as a dead load.

b. Live Live loading shall be in accordance with ANSI/ASCE 7-98 Minimum DesignLoads for Buildings and Other Structures. The Contractor shall determine thecorrect superimposed loading for all floor areas but a minimum superimposed floorload of not less than 5 kN/m 2 shall apply to all plant related buildings.

Global plant loadings e.g. global pipe loads, AC services etc where specific supportpositions cannot be accurately defined at design stage shall be treated as a live load.

The live floor loads to be taken on other specific areas and compartments within theannexes shall be in accordance with the requirements of ASCE 7-98 selected to suit theintended use of the building or part thereof.

The Contractor shall determine the correct superimposed loading for all roof areas but aminimum superimposed roof load of 1 kN/m2 shall apply to roofs where no access otherthan for maintenance and repair is required and a minimum superimposed roof load of 1.5kN/m 2 shall apply to roofs where global access is provided. As stated above these minimumloads are in addition to global plant loadings.

Live loads for steel access platforms, walkways, stairs and handrails shall generally be notless than those specified in Factory Stairways, Ladders and handrails Publication No.105 by The Engineering Equipment and Materials Users Association (EEMUA).

i. Wind Wind loading shall be in accordance with ANSI/ASCE 7-98 MinimumDesign Loads for Buildings and Other Structures. The basic wind speed for Az-


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Specification No. MEW/ZSROP/RO1 5ROC(1) - 40 Contractor's Initial & Stamp

zour South R.O Water Plant site shall be determined by the Contractor, but shallnot be less than 45 m/sec (The basic wind speed is defined as a 3 second gustspeed at 10 m above ground in Exposure C conditions, associated with an annualprobability of occurrence of 0.02).

ii. Seismic Seismic loading shall be in accordance with UBC 1997. Seismic Zone 1shall be assumed for Az-zour South R.O Water Plant site. All building structuresshall be classified as essential facilities and shall be designed with an occupationimportance factor of 1.25 and all elements of structures, non-structural componentsand equipment shall be designed with an occupation importance factor of 1.5.

iii. Thermal The Contractor shall be responsible for determining the correct thermalrange for design purposes but the thermal range shall be not less than 5C to +55C taken as 35C for design purposes when assessing building movementsand shall be not less than 30C when considering strength design. The directsunlight surface radiation temperature shall be taken as up to 85C.

iv. EOT Cranes All loadings, design parameters and crane geometry shall beprovided by the EOT crane manufacturer for the actual crane to be provided andthe Contractor shall base his design on this information. Crane loads shall coverimpact effects and longitudinal and lateral surge loads and shall be in accordancewith ASCE 7-98. Where it is possible for two cranes to operate on the same gantrythen the structural design shall assume that the cranes can operate in tandem.Crane loading data giving minimum hook approaches, maximum static wheel loadsetc. shall be provided on a drawing from the EOT crane manufacturer.

v. Monorails/runway beams All loadings, design parameters and geometry shall beprovided, by the hoist manufacturer, for the actual hoist to be supplied and theContractor shall base his design on this information.

vi. Major pipework loads The plant Contractor shall specify actual major pipeworkloading.

vii. Global pipework loads The plant Contractor shall specify actual global pipeworkloading.

viii. Cables The plant Contractor shall specify actual cable loading.

ix. Plant loads The plant Contractor shall specify actual major and minor plant/machinery loading.

x. Erection loading The plant Contractor shall specify actual plant erection loading.

xi. Installation loading The plant Contractor shall specify actual plant installationloading.

xii. Maintenance loading - The plant Contractor shall specify actual plant maintenanceloading.

xiii. Miscellaneous maintenance/access platform loads - The plant Contractor shallspecify actual maintenance/access platform loading. This loading shall be inaccordance with the minimum requirements of Factory Stairways, Ladders andhandrails Publication No 105 by The Engineering Equipment and Materials Users

Association (EEMUA).


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minimum required directions for wind and earthquake loads

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