Precast components pdf

Precast Concrete Walls. Uploaded by Inzaghi Bird. Did you find this document useful? Is this content inappropriate? Report this Document. Flag for inappropriate content.

Download now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Cladding or Curtain Walls The cladding or curtain walls are the most widely used precast wall for building envelopes. Load-bearing Wall Load-bearing wall units oppose and exchange loads from different components and cannot be removed or dismantled without influencing the quality or dependability of the building. Shear Walls Shear walls are utilized to give a parallel load opposing framework when joined with stomach activity of the floor development.

Bolted Connections The bolted connections are a simplified and fastest method of erection operation. Welded Connections The welded connections are the most common and typical connection used in the erection of precast concrete.

Thermal Resistance The precast walls infer their warm execution attributes basically from the measure of protection set in the depression or inside the reinforcement divider, which is ordinarily a metal stud divider. Moisture Protection The protection for the moisture in the precast walls is of high importance as the structural members such as columns and beams are not structurally connected with the precast walls. Fire Safety The precast walls are manufactured with concrete which has good fire-resistant material.

Acoustics A precast wall with a veneer will give comparative execution with respect to sound transmission from the outside to the inside of the building. Durability The durability parameter of the precast walls is the same as that of concrete.

Maintainability As the walls are manufactured with concrete, which does not need any maintenance. Kavvindra Mehra. Mie Jah. Emdad Yusuf. Ritu Sharma. Elmer Bustamante Valdivia. Jan Vindhya Jopson Prades. Justin Ng. Sandesh Giri. Khaled Nassar. SK Swain. Romenito Reyes. Margie Ocampo. Abdullah Khan. Senn Odrapmasd. Catherine Fatima Mae Leyno. Neha Das. More From Inzaghi Bird. Inzaghi Bird. Popular in Architecture. Ramprasad Jeyaram. List of Monuments of National Importance in Haryana. Richard Tagle.

Nabraiz Ansari. Chapter 1-Introduction to Structural Analysis. Lejla BL. Abdul Sakur. Bhargavi Gorla. Poru Man. Ponz Madiano. Chandra Shekar. Ahmad Imanuddin. Sathish Anandakumar. Guidelines for Repair of Traditional Buildings 1. The beam-column joints accomplished in this way are hinged. However, rigid beam-column connections are used in some cases, when the continuity of longitudinal reinforcement through the beam-column joint needs to be ensured. Precast columns are usually two stories high.

All precast structural elements are assembled by means of special joints. Reinforced concrete slabs are poured on the ground in forms, one on top of the other. Precast concrete floor slabs are lifted from the ground up to the final height by lifting cranes.

The slab panels are lifted to the top of the column and then moved downwards to the final position. Temporary supports are used to keep the slabs in the position until the connection with the columns has been achieved.

The precast concrete column elements are 1 to 3 stories high. The reinforced concrete floor slabs fit the clear span between columns. After erecting the slabs and columns of a story, the columns and floor slabs are prestressed by means of prestressing tendons that pass through ducts in the columns at the floor level and along the gaps left between adjacent slabs. After prestressing, the gaps between the slabs are filled with in situ concrete and the tendons then become bonded with the spans.

Seismic loads are resisted mainly by the shear walls precast or cast-in-place positioned between the columns at appropriate locations.

The stresses developed in precast elements during the period from casting to final connection may be more critical than the service load stresses. Special attention should be given to the methods of stripping, storing, transporting, and erecting precast elements. When precast members are incorporated into a structural system, the forces and deformations occurring in and adjacent to connections in adjoining members and in the entire structure should be considered.

The structural behavior of precast elements may differ substantially from that of similar members that are monolithically cast in place. Design of connections to transmit forces due to shrinkage, creep, temperature change, elastic deformation, wind forces, and earthquake forces require special attention.

Details of such connections are especially important to insure adequate performance of precast structures. Precast members and connections should be designed to meet tolerance requirements.

The behavior of precast members and connections is sensitive to tolerances. Design should provide for the effects of adverse ccombinations of fabrication and erection tolerances. Tolerance requirements should be listed on contract documents, and may be specified by reference to accepted standards. Tolerances that deviate from accepted standards should be so indicated. Whether this information is to be shown on the contract documents or shop drawings depends on the provisions of the contract documents.

The shop drawings should show, as a minimum, all details of the precast concrete members and embedded items. The contract documents may specify that portions of connections exterior to the member are also to be shown on the shop drawings. The contract documents should show the loads to be considered in design of the precast concrete elements of the structure, and they should indicate any special requirements or functions for example: seismic loads, allowance for movements, etc.