Instructional Material Complementing FEMA 1052, Design Examples Diaphragms Analysis - 3 Two Diaphragm-Related Developments FEMA P-1050, the 2015 NEHRP … Since 2000 till now in 2018, precast concrete elements and structures world wide have become: (i) Taller (e.g. Wind load = 30 psf. Plain and lightly reinforced concrete structures . Jensen Precast has been a leader in manufacturing precast concrete products since 1968. Precast design calculations shall be based on the standard design codes and generally the precast members shall have to get connected so that essentially the structure will behave the same as a cast in-situ concrete structure. For example, greater control over the quality of materials and workmanship, improved health and safety (with casting carried out at ground level rather than at height) and cost efficiency (with standard forms continually re-used) are all realised through the off-site production of structural elements. Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and lifted into place ("tilt up"). Two new design examples are included; A design example for the baseplate and anchor bolt sizing of a column connection has been added; A design example for strength analysis of a weld group has also been added. Precast Concrete Bearing Wall Panel Design (Alternative Design Method) (Using ACI 318-11) A structural precast reinforced concrete wall panel in a single-story building provides gravity and lateral load resistance for the following applied loads: Weight of 10DT24 = 468 plf Roof dead load = 20 psf Roof live load = 30 psf Wind load = 30 psf The 10DT24 are spaced 5 ft on center. Precast concrete elements can be joined to other elements to form a complete structure. 3547 0 obj <> endobj In addition to his duties as a faculty member in the Department of Civil Engineering, Professor Park is Deputy Vice-Chancellorof the University of Canterbury and Chair of the Concrete Design Committee of Standards of New Zealand. These guidelines are based on the latest research and practical experience gained from their use in various parts of the United States. = 34” After a brief review of the history of bridge deck panels, suggestions are given for the dimensioning This example illustrates the analysis and design of precast reinforced concrete bearing wall panel in a single-story building. The fluid level inside the tank is 15′. The wall height is 17′. Using an allowable concrete stress of 45% of the minimum specified compressive strength of 4,000 psi, the allowable compressive stress would be 1,800 psi. Two new design examples are included; A design example for the baseplate and anchor bolt sizing of a column connection has been added; A design example for strength analysis of a weld group has also been added. 36-storey skeletal precast frame) and 54-storey wall frame (the Netherlands) (ii) Longer (e.g. 22 February 2008 6 EN 1992-1-1 “Concrete structures” (2) Annexes: A. Bridge Design Manual (2014). 3553 0 obj <>/Filter/FlateDecode/ID[]/Index[3547 13]/Info 3546 0 R/Length 52/Prev 1391267/Root 3548 0 R/Size 3560/Type/XRef/W[1 2 1]>>stream be provided separately for reinforced concrete (precast) masonry lintels. LRFD Design Example – Prestressed Precast Concrete Beam Bridge Design. Precast/Prestressed Concrete Institute (PCI), Chicago, IL. 2004. V n = nominal shear strength of a cross-section before application of strength reduction factor, lb. 335 0 obj <> endobj �/ag��tmu٪�������`}6�t�K,���md�Xs!苢��,N�V�M5�7�� ަa-��k!k6ӂBG��>�O�vwi�\zThc0�#}�V��j����]����'0�S�r$��Y��f-q� �]`J��Q�� Definitions of special precast concrete struc- Precast, Prestressed Girder Design Example –PGSuper Training ( 2/4/2020) 1 . 7�"����"�M�tv�T�D�XA�\�����7�(",��B2/��>��F��מ�T'�s��Ø�Yo�G�ɳV�L�\��&�#�$�J^[��6���8 �؀�A���������!����I� � �@R�c� 2B3�J I��1���a��(�Si��с�������(���BPE ��#�EV �(AM;W�\e���l y���H&%�� �g1���fD�c��[`��AȲ H��!Ha`hg����� ��E�/�7�:La����("qX�]��)�N2�$Ҭj�@��H�y -��0������H�e�Tsk �DŎ 0 Precast concrete wall systems offer a wide variety of shapes, colors, textures, and finishes to the designer. The Provisionshave a few requirements beyond those in ACI 318 and these requirements are identified in this example. Structural steel frames can provide an alternative for pre-fabricated structural components, but precast concrete can be more economical and sometime… DTFH61-02-D-63006. There is a nominal strength that is reduced by a factor which must exceed the factored design stress. Example: A thin walled rectangular section, 6 ... Prestressed Concrete Institute (PCI). As an example, in regard to 'mechanical resistance' EN 13369 Cl 4. Extending Span Ranges of Precast Prestressed Concrete Girders. Hershey Medical Center is an example of a precast concrete hospital building. 0 Roof dead load = 20 psf. In contrast, standard concrete is poured into site-specific forms and cured on site. = 30” H.S. Typically precast connections can be done with an industrially produced connection part, wet connection, bolt, or weld connection. A precast concrete structural system offers many advantages over in-situ casting. The span of the beam is 24.0m centre to centre of bearings and the beams are spaced at 1.0m intervals. Other important design parameters include the following: • Reinforced concrete masonry strength design reduction factors for flexure and shear are based on ACI 530 and are 0. Examples of this include bridge construction and, most recently, concrete structures in the petro chemical industry. Technical Report 0-6863-R1-Vol2 . V m = shear strength provided by masory masonry, lb. Example: ? PRESTRESSED CONCRETE CONSTRUCTION MANUAL 3rd Edition April, 2017 NEW YORK STATE DEPARTMENT OF TRANSPORTATION OFFICE OF STRUCTURES About the Cover: Roslyn Viaduct over Hempstead Harbor The Pier Village Parking Structure is an example of a precast concrete parking structure. Precast/Prestressed Concrete Institute (PCI), Chicago, IL. Instructional Material Complementing FEMA 1052, Design Examples Diaphragms Analysis - 2 2015 NEHRP Provisions. The purpose of this document is to illustrate how the PGSuper computer program performs its computations. %PDF-1.5 %���� Precast concrete walls that are designed to conform to ACI 318-05 Section 21.8, and by reference to 21.7 and 21.13, are special reinforced concrete shear walls, with the design fac-tors as defined in ASCE 7-05,7 Table 12.2-1. Design of Precast Concrete Seismic Bracing Systems 34-5 34.2.2 Creating an Effective Moment Transfer What makes a yielding connection different from a plastic hinge in a cast-in-place beam? A boom of popularity in the 1930s saw an impressive number of iconic buildings being made with precast concrete. Containment by compartmentalizing the design with a precast concrete structural system limits damage and may allow occupants more time to evacuate the premises. Precast Concrete Diaphragm Design Procedure ... example is chord reinforcement above an inverted tee . Precast Concrete Design -67 Calculation of moment strength of beam in frame example Precast Concrete Design -68 Calculation of the probable moment strength of beam joint in frame example is shown in the slide. ... Comprehensive design example for prestressed concrete (PSC) girder superstructure bridge with commentary. Rectangular Concrete Tank Design Example An open top concrete tank is to have three chambers, each measuring 20′×60′ as shown. A step-by-step design procedure is given for composite beams using various forms of precast concrete units, with or without a concrete topping. 2. beam in a pour strip which extends beyond the space . After reviewing the literature and exploring the current concrete technologies and some reuse examples of concrete elements, it can be concluded that precast concrete technology represents a suitable example that if it has been developed, it will satisfy the requirements of future disassembly. Precast, Prestressed Concrete Bent Caps: Volume 2 Design Recommendations and Design Examples https://precast.org/2018/09/concrete-mix-design-proportioning = 3” O.D. This document provides guidance for the design of a precast, prestressed beam bridge utilizing the AASHTO LRFD Bridge Design Specifications. ��s�gΙy�̼�3g�utΚ���1sf���3��99&303�,ld8Ь��8���m���&��*��~��Όmז́I��T�H���Up�M��d��g��A�,�A~�lA~�;6N8��;�MB�pԤ��-Fbϖ�k�(��! Precast concrete beam design (EN1992) The calculation checks the design of rectangular, T, inverted L, inverted T and L beam sections, subject to major axis bending, torsion and shear. A step-by-step design procedure is given for composite beams using various forms of precast concrete units, with or without a concrete topping. 50 m long prestressed concrete beams) (iii) Deeper (e.g. endstream endobj startxref Design of Walls 8.0 NOTATION acj ex.l Deflection due to slenderness of wall Distances from compression face to centroid of layers of concrete in compression Distances from compression face to centroid of layers of tensile reinforcement Area bounded by median line of wall in closed cell Net area of concrete in a section of wall This is supplemented by a fully worked design example for a composite beam in a 15.8 m × 7.2 m grid, and a series of design tables for concept design. γ … Precast concrete is reinforced concrete constructed by industrialized methods. The precast seating deck used in the study was designed according to the requirements of BS 8110-1:1997 with a design live load of 4 kN/m 2 for an assembly area with fixed seating. V s = shear strength provided by shear reinforcement, lb. Design a simply supported prestressed concrete Y beam which carries a 150mm thick concrete slab and 100mm of surfacing, together with a nominal live load udl of 10.0 kN/m 2 and kel of 33kN/m. The precast concrete manufacturer designs the cladding for the specified loads, erection loads, connection details, and provides for the weatherproofing, performance and durability of the cladding itself. Precast Concrete Bearing Wall Panel Design (Alternative Design Method) (Using ACI 318-11) A structural precast reinforced concrete wall panel in a single-story building provides gravity and lateral load resistance for the following applied loads: Weight of 10DT24 = 468 plf. Lintel Design Manual v t = thickness, in. with concrete masonry. w = load per unit length, lb/ft. CHAPTER 5 - ARCHITECTURAL PRECAST CONCRETE The design of architectural precast concrete … The model was observed to have an empty natural frequency of 6.47 Hz. 150 to 260 mm depth, and to solid precast planks. �� = 24/12 + 1 = 3” O.D. Precast concrete forms can create columns, round pipes, angles and other dimensional shapes such as concave and convex that may serve a specialty function or add style to … h�bbd``b`y$ׂ��@�YDD�/�L��Y@#:��˷? endstream endobj 3548 0 obj <. �@B�H�2012��iM�g�� � �4w The complex design of the Sydney Opera House was possible, in part, to precast concrete. This example illustrates New Mexico Department of Transportation (NMDOT) design procedures for a three-span prestressed concrete girder bridge. Here are six stunning examples of buildings made with the help of precast concrete panels. Viber. Nov 24, 2016 - Example Slab-to- Beam Connection • Hollow core slabs are set on bearing pads on precast beams. the design, manufacture and erection of precast prestressed concrete bridge deck panels. This is supplemented by a fully worked design example for a composite beam in a 15.8 m × 7.2 m grid, and a series of design tables for concept design. 3559 0 obj <>stream This study represents a brief revision of the state of the art in this context. Civilax - September 25, 2017. = 24 + (3 x 2) = 30” Hole Size (H.S.) 363 0 obj <>/Filter/FlateDecode/ID[<7E2DF20C54F7164A840421E1C65722F7>]/Index[335 51]/Info 334 0 R/Length 121/Prev 350845/Root 336 0 R/Size 386/Type/XRef/W[1 2 1]>>stream METHODOLOGY 3.1 Precast Yard Role Precast concrete elements can comprise an entire structure of structural elements that are created offsite and can be supplied for incorporation into a structure on-site. Washington, DC. 4. Appendix C: Design Example #1 ..... C-1 Appendix D: Design Example #2 ... Transportation (TxDOT) first began using precast reinforced concrete (RC) bent caps in the early 1990s. Bridge Design Manual (2014). Precast concrete is reinforced concrete that is cast away from the building site, and assembled on site. Lightweight aggregate concrete structures 12. Concrete Mix Design Calculation : M20, M25, M30, M40 Grade Concrete Concrete mix design is a procedure of selecting the suitable ingredients of concrete and their relative proportions with an objective to prepare concrete of certain minimum strength, desired workability and durability as economically (value engineered) as possible. Concrete Structures (AS3600-2009), Sydney Australia, Standards Australia; 2009 [3] Australian Standards 3850 (AS). Prestressed Concrete Beam Example to British Standards Prestressed Concrete Beam Design to BS 5400 Part 4. Some of the images and calculations included in this article were taken from the worked example of “Prestressed concrete girders according to Eurocode 2” published by the Fachvereinigung Deutscher Betonfertigteilbau e. V. [4]. The molds used in precast concrete, which can be customized, also enhance the surface and shape of the pieces. = 30 + 4 = 34” Hole Sizing for Reinforced Concrete Pipe (ASTM C76) I.D. The structural engineer shall also review all the drawings prepared by the drafting team and make sure they comply with his design. %%EOF CDI, located in Tucson, Arizona, specializes in the design and manufacture of Architectural Precast Concrete, GFRC and Lightweight Concrete. 6th edition Chicago (IL): Precast/Prestressed Concrete Institute; 2004. Precast Engineer: The precast engineer performs the structural analysis and prepares the structural design calculations of each precast concrete component and their connections. The example design of the cazaly hanger has been extensively updated from the last edition. Roof live load = 30 psf. It is characterized by dividing the building into components, which are manufactured in a precast concrete plant, and transported by special transportation equipment to the site. If column-to-column connections are required, ACI 318 Section … 150 to 260 mm depth, and to solid precast planks. PCI recently published its updated fire manual including an International Code Council Evaluation Service (ICC-ES) report that allows its use as an alternate to … Example 2 - Solution (b) Steel Stresses Bottom layer at the tendon: f sb = sb E s = 0.00742 205 103 = 1522 N/mm2 (c) Forces in Steel & Concrete Steel tensile forces, F st = f s.A ps = (f sb) 7 94.2 = 1003 103 N Concrete compressive forces, F cc = 0.567f ck b 0.8x = 0.567 50 1168 0.8 75 = … the design, manufacture and erection of precast prestressed concrete bridge deck panels. 24” W.T. PRECAST CONCRETE CONNECTIONS IES lecture 24 Oct 2018, Wed (750pm-830pm) Dr.Kong Kian Hau SENIOR LECTURER (CEE NUS) B.Eng(Civil) (1st Class Hons., NUS), PhD (Structural Engineering), Chartered Structural Engineer (UK), International PE (UK) Applied Research Area: Structural Dynamics, Structural Engineering Design, Precast Concrete Technology, Structural Repair, Strengthening & … The panel provides load resistance for gravity loads from double tee roof framing and applied lateral wind loads. Precast concrete is a form of concrete that is prepared, cast and cured off-site, usually in a controlled factory environment, using reusable moulds. Problem: Design a simply supported prestressed concrete Y beam which carries a 150mm thick concrete slab and 100mm of surfacing, together with a nominal live load udl of 10.0 kN/m 2 and kel of 33kN/m . 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