Al­tair’s struc­tural en­gi­neer ex­plains high-rise de­sign prin­ci­ples at Colombo fo­rum

Daily Mirror (Sri Lanka) - - BUSINESS NEWS -

The com­plex cor­re­la­tion be­tween re­in­forced con­crete shear walls, steel frames and out­rig­gers in mod­ern sky­scrapers was de­mys­ti­fied by one of the world’s lead­ing struc­tural en­gi­neers at a pro­fes­sional fo­rum in Colombo re­cently.

Us­ing case stud­ies of some of most re­mark­able high rises un­der con­struc­tion around the world, Al­tair struc­tural en­gi­neer and Derby De­sign Engi­neer­ing prin­ci­pal Pre­drag Eror ex­plained how struc­tural de­sign prin­ci­ples en­able tall build­ings to sway with no com­pro­mise to their in­tegrity.

Eror was an in­vited speaker at ‘Vi­sion for High Rise Build­ings – 3’ or­gan­ised by the So­ci­ety of Struc­tural En­gi­neers Sri Lanka (SSESL). His pre­sen­ta­tion on ‘Struc­tural Sys­tems for High-rise Build­ings’ was at­tended by 240 engi­neer­ing pro­fes­sion­als and stu­dents and in­cluded an hour de­voted to ques­tions and an­swers.

“I was im­pressed with the depth of in­ter­est in the sub­ject and the en­thu­si­as­tic en­gage­ment of the au­di­ence,” Eror said. “Nat­u­rally, there was ex­tra in­ter­est in the de­sign el­e­ments of the Al­tair build­ing, which is one of a kind, and one of the most in­ter­est­ing con­struc­tions I have been in­volved with in my 30 years as a struc­tural en­gi­neer.”

The six build­ings pre­sented as case stud­ies in com­plex de­sign prin­ci­ples were the 2020 Tower in Dubai (300 me­tres; 63 floors), Tiara United Tow­ers also in Dubai (225 me­tres; 62 floors), Cres­cent City Tower in Baku, Azer­bai­jan (210 me­tres; 43 floors), Vida Dubai Creek Har­bour build­ing (210 me­tres; 52 floors), Mina Seyahi Le Meri­dien Ho­tel ex­ten­sion (127 me­tres; 31 floors) and Al­tair in Colombo (230.1 me­tres; 68 floors). Pre­drag Eror is the struc­tural en­gi­neer for all of these ed­i­fices.

While ex­plain­ing the de­sign prin­ci­ples and laws of physics that ap­ply to the com­mon­est types of struc­tural sys­tems fol­lowed in the con­struc­tion of high-rise build­ings, Eror stressed that the struc­tural en­gi­neer’s re­spon­si­bil­ity is not only to de­sign the struc­ture for per­ma­nent load­ing con­di­tions, but to pro­vide the ini­tial idea on how the build­ing is to be con­structed, de­velop meth­ods of con­struc­tion, check all stages of con­struc­tion, and ac­tively work and as­sist the builder dur­ing the con­struc­tion process.

“With Al­tair for ex­am­ple, Derby De­sign Engi­neer­ing was in­volved even be­fore the ar­chi­tect was ap­pointed, and has been en­gaged in test­ing and mon­i­tor­ing ev­ery stage and el­e­ment of the con­struc­tion, in­clud­ing pil­ing, floor slabs, stair­cases and bridges,” Eror said, dis­clos­ing that in-depth re­search was con­ducted into high-grade con­crete, as a re­sult of which Al­tair was built with a con­crete con­form­ing to the high­est Bri­tish stan­dard, a grade pre­vi­ously un­used in Sri Lanka. Al­tair com­prises of two struc­tures, one a 230.1 me­ter ver­ti­cal tower and the other a tower that is in­clined from level 5 to level 39 and goes ver­ti­cal up to roof level at a height of 209.1 me­tres. The in­clined or step­ping tower has an an­gle of 13.8 de­grees from the ver­ti­cal and leans to­wards the ver­ti­cal tower. The tow­ers are con­nected by steel out­rig­gers at four points at lev­els 39 and 41. Each tower is sup­ported by ex­ter­nal walls and in­ter­nal core walls form­ing a three di­men­sional struc­tured frame. These walls are in the range of 350-500 mil­lime­tres thick. Above the podium level, the ex­ter­nal walls are trans­ferred via trans­fer beams which are also sup­ported by re­in­forced con­crete col­umns and re­in­forced con­crete walls at podium level.

The ex­ter­nal frame of the ver­ti­cal tower com­prises of re­in­forced con­crete span­drel beams and re­in­forced con­crete col­umns sup­ported by trans­fer beams at Level five of the podium. The ex­ter­nal frame of the in­clined tower is com­posed of di­a­grid mem­bers made of steel col­umns which are sup­ported by trans­fer beams also at Level five.

“There was a lot of in­ter­est in the di­a­grid struc­ture of the in­clined tower, in how the two tow­ers are con­nected to­gether, how they work to­gether and how they work in­de­pen­dently,” stated Eror.

He said the in­ter­est shown by struc­tural en­gi­neers in Sri Lanka mir­rors the re­ac­tion the Al­tair build­ing gen­er­ates among those who see images of it around the world. “Ev­ery mod­ern technique and idea seen in high rise build­ings around the world has been ap­plied here,” he said, re­veal­ing that he has spent 50 per­cent more time on Al­tair than on the most com­pli­cated build­ing he has worked on to date.

“In Dubai, I was told that if this build­ing had been lo­cated in the Ma­rina, it would have sold out in two days,” Eror added.

Pre­drag Eror

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