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Hollow Core Diaphragm Design
Hollow Core Diaphragm Design Handout
Hollow Core Diaphragm Design Handout
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Pdf Summary
The document provides a comprehensive rundown on the design of hollow core diaphragms following guidelines articulated in ASCE 7-10 and other relevant standards like the 2015 International Building Code (IBC) and ACI 318-14. The Precast/Prestressed Concrete Institute (PCI) details both prescriptive and calculative methods for differentiating between rigid and flexible diaphragms, where seismic forces are managed based on the diaphragm type and construction material.<br /><br />Dr. Ned Cleland of Blue Ridge Design, Inc., explicitly covers general design criteria, emphasizing no exceptions to the detailing provisions as per IBC or ASCE 7. He highlights variations in the distribution of seismic forces among structural elements and specifies conditions under which diaphragms can be designated flexible or rigid. Flexible diaphragms are generally noteworthy in light-frame construction or untopped steel decking, while rigid diaphragms involve concrete slabs within specific span-to-depth ratios.<br /><br />Key considerations for diaphragm design include:<br /><br />1. **Distribution of Forces:**<br /> - Rigid diaphragms distribute seismic story shear based on lateral stiffness.<br /> - Flexible diaphragms distribute shear based on tributary areas.<br /><br />2. **Design Forces:**<br /> - Calculated using ASCE 7 formulas.<br /> - Incorporate factors like weight tributary (wi) and force at specific levels (Fi).<br /><br />3. **Structural Integrity:**<br /> - Ensuring adequate connections between structural elements.<br /> - Addressing vertical and horizontal irregularities, especially in seismic design categories D, E, and F.<br /><br />4. **Materials and Methods:**<br /> - Reinforced and prestressed concrete requirements.<br /> - Criteria for composite vs. non-composite topping slabs.<br /> - Shear friction reinforcement practices, especially at joints and for transfer forces.<br /><br />5. **Examples and Calculation:**<br /> - Illustrations of diaphragm actions, including distribution and shear connection forces.<br /> - Recommendations for handling seismic loads and designing for structural integrity under various loading conditions.<br /><br />6. **Comprehensive Example:**<br /> - The document includes a step-by-step design example for a six-story building, detailing load calculations and shear force distributions.<br /><br />The content also underscores accreditation details, offering continuing education credits for professional engineers, and provides procedural instructions for participants in the PCI's educational program. The document serves as an instructional resource aimed at informing engineers on the complex aspects of designing hollow core diaphragms for resilience against seismic and other forces.
Keywords
hollow core diaphragms
ASCE 7-10
2015 IBC
ACI 318-14
seismic forces
rigid diaphragms
flexible diaphragms
structural integrity
shear distribution
concrete slabs
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