대나무 초고층빌딩의 미래 Tall timber construction is coming—this video proves why: VIDEO

Tall timber construction is coming—this video proves why

A stress test by Skidmore, Owings & Merrill proves the strength of this sustainable building system.

SOM and Oregon State University tested high-tech timber construction earlier this month.. SOM

VIDEO

Timber Tower Research Project: Successful Test at Oregon State University from Skidmore, Owings & Merrill LLP on Vimeo.

세계적인 초고층 건축회사 솜(SOM)사는 철골-유리 구조로 대표되는 많은 고층 빌딩을 만들어냈다.

솜사는 현재 철골 대신에 나무를 이용한 초고층 건축을 연구하고 있다.

초고층을 건설하기 위하여 지속가능한 여러 방법을 제시하며 목표를 추구해왔으며 2014년 40층 이상의 대나무 초고층건물을 건설하려는 초고층 대나무연구프로젝트를 통해서 대나무를 이용한 기술을 세계적으로 선도하고 있다.

솜사는 철근과 레미콘의 이산화탄소 배출량을 60~75%를 감소시킬 수 있는 기술을 연구해왔다.

그간 미래의 주택 자재로 주목받고 있는 교호집성재(Cross Laminated Timber)는 전세계적으로 건축자재로 사용되어 왔다.

하지만 교호집성재(목재 판재를 서로 가로질러 90도 직교 제작한 것으로 기존 제품에 비해 차음성, 내구성에서 탁월) 아직 내화성과 구조적 안정성에서 불완전하다.  

이달 초 오레곤 주립대와 이런 점을 불식시키기 위하여 솜사의 엔지니어들은 구조적 시험의 일부분으로서 유압프레스로 콘크리트로 보강된 목재 바닥시스템의 강도 시험했다. 

연구진들은 바닥시스템이 파괴될 때 82,천파운드(36.9톤)의 강도에 견딘다는 것을 알았다.  이것은 설계 하중기준의 8배나 되는 강도이며 예를들면 3m 깊이의 수영장 무게의 지지도 가능하다.

건축 감리자의 기준을 무난히 통과할 수 있는 강도다.

농담같이 들릴지 모르지만 솜사의 구조엔지니어인 존슨은 이것이 콘크리트를 활용한 하이브리드 디자인인 '콘크리트조인트팀버시스템'의 중요한 일부하고 설명하고 있다.

또 존슨은 이런 상황을 감안하면 철골 구조의 윌리타워는 콘크리트-목재와 철근-콘크리트가 동일한 비율로 적용될 수 있다는 것을 의미하고 있다는 것을 설명하고 있다.

황기철  콘페이퍼 에디터

ki chul, hwang conpaper editor 

관련기사 Related:

대나무가 건설산업에서 철근을 대체할 수 있나? Could Bamboo Replace Steel in Reinforced Concrete?

http://conpaper.tistory.com/37515

BY PATRICK SISSON  @FREQRESPONSE AUG 19, 2016

Skidmore, Owings & Merrill (SOM), the global firm responsible for many of the world’s highest and most high-tech skyscrapers, knows a few things about building high-rises. While their architects have created many of the most iconic steel-and-glass structures in the world, the firm has also made recent research investments in elevating another material, wood, as a structural backbone for future tall towers.

With the general push toward greener construction over the last few decades, the idea of tall timber towers, supported by wooden frames, has become a sought-after goal, offering a more sustainable way to build skyscrapers. SOM itself was a leader in promoting the idea, conducting a Tall Timber Research Project in 2014 that concluded that tall wood structures of 40-plus stories could “compete with reinforced concrete and steel while reducing the carbon footprint by 60 percent to 75 percent.”

While many have been built around the globe, cross-laminated timber projects still produce a degree of uncertainty, especially around issues of fire safety and structural stability. Earlier this month, SOM, along with Oregon State University (OSU), may have put some of the doubter’s fears to rest.

As part of a series of structural tests, a group of engineers tested a concrete-reinforced wooden floor system under the weight of a hydraulic press. When the test floor was eventually crushed, researchers determined it could support  82,000 pounds, approximately eight times the required design load. That’s the equivalent of 640 pounds per square foot, strong enough to support a 10-foot-deep swimming pool and more than tough enough to pass muster with building inspectors.

 

Including concrete may sound like cheating. But according to Benton Johnson, a structural engineer at SOM, it’s a key part of the Concrete Jointed Timber Frame system, a hybrid design which utilizes concrete joints. SOM believes it’s reliable and sustainable enough to make tall timber a standard building system. To put it in perspective, Johnson noted that the Willis Tower, which is called a steel tower, has as a steel-to-concrete ratio equivalent to the wood-to-concrete ratio of a proposed tall timber building.

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http://www.curbed.com/2016/8/19/12555548/timber-tower-skyscraper-test-som

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