Strengthening of Timber Beams

Strengthening of Timber Beams

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Sika India Pvt. Ltd. is 100% subsidiary of Sika AG; its India operations started in 1985 as an Indian company and were known as Qualcrete India Limited in 1987. Qualcrete India Limited forged an alliance with Sika AG, Switzerland and was renamed as Sika Qualcrete Limited. In 2002, Sika AG, Switzerland acquired 100% stake in the company and since then the company has been rechristened as Sika India Pvt. Ltd. It is a wholly owned subsidiary of Sika AG which is a globally active specialty chemicals company. Sika supplies the building and construction industry as well as manufacturing industries (automotive, bus, truck, rail, solar and wind power plants, façades). Sika is a leader in processing materials used in sealing, bonding, damping, reinforcing and protecting load-bearing structures. Sika’s product lines feature high quality concrete admixtures, specialty mortars, sealants and adhesives, damping and reinforcing materials, structural strengthening systems, industrial flooring as well as roofing and waterproofing systems.

Project in focus: Strengthening of Wooden Beams

The project was to strengthen the beams of 200 years Mangaldas ni Haveli situated in Sankdi Sheri, which is in the walled city of Ahmedabad, Gujarat. The structure is load bearing type having masonry walls and wooden columns as vertical supporting members, whereas wooden beams support spars (secondary wooden beams) and floor plate. The floor plate is of brick bat lime concrete subfloor supported on the wooden planks. The woodwork is carved and floral motifs painted in green and gold colours.

The structure (Wooden beam of chowk area) has shown major signs of distress having a major longitudinal crack along with deflection. Due to this, the floor supported on the same is also showing cracks in the flooring. The owners have done temporary measures by supporting with the help of jacks so as to transfer the loads via jacks.

Addressing the challenge:

The biggest challenge was to strengthen these beams and retain the heritage looks. There were no guidelines available for timber design and replacing the beam with wood was difficult considering the availability of skilled workers. Various options for restoration were in discussion. Then, Sika India came into the picture and shared with them SikaWrap® & Sika®Carbodur® Strengthening. With the help of Sika Technical Services (India & Switzerland) along Ami Engineers Strengthening of Timber beams using SikaWrap & Sika Carbodur worked out in a better way. The design for Fiber wrapping was carried by referring CNR-DT 201/2005 – Guidelines for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures – Timber structures.

A demo model was created to test the strength of wooden beams with SikaWrap System at K.B.M. Engineering Research Laboratory.

For further details:
Sika India Pvt. Ltd.
601, A Wing, Infinity Tower, Off. Link Road, Malad (W), Mumbai – 400064
Ph: +91-22-40384038
Email: info.india@in.sika.com,
chugh.sachin@in.sika.com
Web: http://ind.sika.com

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