The document provides guidance on making precast prestressed concrete lintels. It discusses the requirements for precast lintels, how prestressing is done using steel wires under tension, the necessary equipment, and design considerations including …

Precast concrete lintels are designed using the strength design provisions of Building Code Requirements for Structural Concrete, ACI 318-99 (ref. 2). In strength design, service loads are increased to account for variations in anticipated loads, becoming factored loads. The lintel is then sized to provide. suficient design strength.

A lintel is a block or plate of concrete used to fill gaps on buildings or during construction work. They are steel-reinforced in order to carry heavy weights and to prevent the concrete plates from breaking during fitting. They are usually bought pre-manufactured, but can be …

The discussion, design tables, and design philosophies are intended to assist architects and engineers in the design of concrete masonry and precast concrete lintels and to acquaint builders and contractors with recommended construction methods and details.

2023年1月16日 · Video Highlights What type of concrete is used for lintels? What is precast concrete lintels? How thick should a concrete lintel be? What is a precast concrete lintel? What is...

The focus of this manual — broken into five sections — is on reinforced concrete masonry lintels and precast reinforced concrete lintels. First, a discussion on the materials commonly used for lintel construction is presented.

Strength design criteria will be provided separately for reinforced concrete (precast) masonry lintels. The design of precast concrete lintels is based on the 1995 Building Code Requirements for Structural Concrete (ACI 318). Materials used in the construction of masonry lintels include bond beam sections, mortar, grout and steel.

lintel Design Precast lintel dimensions are illustrated in Figure1. Lintels are manufactured to an actual height of 7-5/8 inches to coincide with the typical course height of concrete masonry. A modular lintel length should be specified which equals the clear span plus at least two times the lintel height to provide for proper bearing at each end.

lintel sizes. Design tables also may be used for concrete, precast con-c r ete, natural stone, and cast stone lintels. Of course, simple engineer-ing analysis can be used in design-ing lintels of any material. Some p roprietary support systems also p rovide flexural strength for masonry lintels (see M a s o n r y C o n s t r u c t i o n ...

2020年11月12日 · Precast concrete lintel. Essentially, the idea behind thin precast lintels is that the provision of top reinforcements and hanger bars can be neglected for lightly loaded one-span members in bending. Reinforcements are provided at the bottom of the lintel to take up all the flexural stresses.