Case Study
M/s United Phosphorous LTD.
Tensile Fabric Structures
Tensile Membrane Structures
Tensile Façade Structures
Project Engineer Aakruti Tenso structures & Façade Pvt. Ltd.
Client M/s United Phosphorous LTD.
Date/Month of Installation Jun-12
Requirement Wakway between the Main gate & Office bld-1 & office bld-2
Size 470 sq.meters
Span Max span of 45 mt. x 4 - 5 mt.
Architectural Design Aakruti Tenso structures & Façade Pvt. Ltd.
Fabrication By our team of enginners & craftmen
Installation Inhouse team from Aakruti Tenso structures
Requirements

The Esteem indian Multi national having Administration ,Accounts,Purchase, contracting, sourcing office spread across 3 different Office Buildings. The client needed seamless movement from Main gate to all buildings & between each buildings in all whether.

The major need for the walkways is in Harsh summer & monsson.

More then 40 Cars were being parked in the same area .So the most important condition for the PVC Coated Tensile membrane roof being not to introduce any structural members hampering free movements of the vehicles Parked

Challenge

The Major challenges were mainly 2. Firstly there was no time slot or working space alloted for the structural fabrication or installations. So only sundays were free for any site related work.

Secondly the office buildings were added in phase manner & all the Buildings were converted form existing Residential Structure to office structure without Major changes except the main office building. The orientation & the size of all the 3 buildings were non Symetrical & having different sizes. The structural drawings were not available for any of the 3 Buildings.

Area

The whole Walkway area was divided into 3 major Parts. Main entry to Reception (Building 1), Building 1 to Building 2 , A walkway running Parrallel to Building 2 for Movement between variuos Utility & Building 3. We Proposed standalone foundations for most of the supports, & the Major corner column & perferial Beams were located for rest of the Anchor points for the PTFE tensile roof proposed.

Solution

We proposed 2 Arches on Pin joints connected by perlin Members for 2 of the 3 walkways.Additional stability of the Arches were ensured through Structs supports from 2 nd levels to the arches.Each pair of the Arches supported 2 fabric membrane cones each through radial Mambers supporting the Beil Rings.

The fabric with edges fixed at the Arch top edge through Aluminium Kedar profiles was proposed. Due to the curvature of the Arches & the Natural curvature of the 2 cones generated on the top of arches the water was directed towards the ends of the walkway fully, there by eliminating water curtain affecting free movements of people in monsoon.

Design /Analysis

The Twin cones without any intermediate supports when modelled in FEM software , & Analysed with wind , & live loads apart from the Prestress; introduced sizable Reaction forces in the end Pin joints. The Bending moments were kept in control thanks to Pin joints & struts .To keep member sizes for the Arches under control, Trusses were proposed to control matrial consumption.

Primary Structure

After Staad Analysis the Main Columns were Fabricated from 219 Dia X 8 mm hollow ERW pipes the rest of the members sizes varing from 45 mm to 135 mm hollow ERW pipes

The top ring Dia 500 mm supported on Dia 90 mm Mast which in turn was supported by 4 radial members from each of the corner, having Dia 90 mm through a Sliding joint in the center to enable pretensioning while PTFE Tensile membrane installation.

Fabric details

The Ferrari 702 S , PVC coated fabric was patterned Radially in all 32 parts/ 24 parts , depending on the size of the cone .To absorb higher stresses towards the Ring center the fabric was reinforced with another layer of 702S membrane patterned in floral shape .

For fixing the fabric edges to structural members extruded Aluminium profiles were used. Overall the total fabric was made in 3 parts.

Installation

One Sunday right from early in the morning to late in the night we could install all the 3 Fabric without any mechanical help like cranes or Hoist as there was no room for a crane to enter the area . The subsequent Pretensioning was carried out in next 2 days in working Hours only.

PVC Coated Tensile Membrane Roof Structures
Tensile Membrane Roof Structures for Walkaways

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Fabric Roofing for : Stadiums, food courts, Amphitheatres, Skylights/ Atrium's, Walkways, Car Park, Entry Canopies, sales pavilion, Gazebos, Resorts, clubhouses, events, educational institutes, schools, International institutes, universities, campus, outdoor structures, offices, corporate buildings,....