Opal Tower Final Report Design And Construction Faults

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An independent final report found multiple construction and design faults in the new 117m building in Sydney’s Olympic Park.

The new report from 3 senior engineers, commissioned by the NSW government, found that the use of inferior materials and beams that were not designed to spec led to the damage in what as been called “the 8 seconds of cracking” on Christmas Eve.

However, the report did not lay specific blame on any of the major parties involved: developer Ecove, engineering by WSP, and builder Icon.

The building was found to be overall structurally sound, but some of the horizontal concrete “hob beams” were not up to standards of strength… or national codes.

According to the report, insufficient grout on the beams was another problem:

“Our final report confirms that a number of structural design and construction issues, including non-compliance with national codes and standards were responsible for the observed damage at Opal Tower.

“We found some of the as-constructed hob beams and panel assemblies were under-designed according to the National Construction Code and Australian Standards, leaving the beams prone to failure.

“We also found construction and material deficiencies likely contributed to the damage to the hob beams on levels 4 and 10.

“We consider that the building is overall structurally sound and the localised damage to the building can be rectified to ensure the building is compliant with the National Construction Code.”

The report confirmed that most if not all of the major columns in the building had been designed such that their load capacity well exceeded expected load to be placed on them.

Still, of the 392 apartments in the building, only 170 have been declared fit for occupation. Many families are still stuck in temporary accommodation, and likely will be for weeks to come.

Some former residents said they will never return.

Among the multiple findings of construction fault:

“During our investigations, and subsequent to the issue of our interim report, records of strength for the concrete used to construct the hob beam were provided to us.

“These reveal 28 day strengths of these concrete samples as 50 MPa, where 65 MPa concrete was ordered for supply, indicating that the concrete in the hob may also have been of a lower strength.”

Experts have recommended creating a database of engineer registrations and building certifications, as well as a structure review board to more closely monitor building flaws, and provide input for future building codes.

“We agree in principle with the rectification works planned to date, noting that these have advanced considerably since our interim report was released.

“However, we repeat our call for qualified structural engineers to check the final design and construction proposals in detail before major rectification works begin and before the building is deemed completely safe for occupancy, while noting the reoccupation of the building extends beyond the scope of our investigation and is a matter for residents and the builder.

Matt Kean, Minister for Better Regulation, said the government supported the recommendations.

Minister for Planning and Housing also appeared to endorse the scheme.

“We will be working through the detail of today’s report with our new Building Commissioner to make sure that when homeowners are handed over the keys to a new building, it is safe, structurally sound and free from major defects.”

Ref: Lonny. (24.02.2019). Opal Tower Final Report: Design And Construction Faults. Retrieved from https://www.propertynerd.com.au/news/opal-tower-final-report-design-and-construction-faults

Opal Tower 最终报告-设计和施工缺陷

独立的最终报告发现在悉尼奥林匹克公园新建的117米建筑中多处建筑和设计缺陷。

由新南威尔士州政府委托的3名高级工程师发布的新报告发现,使用不符合规格的劣质材料和横梁会导致圣诞节前夜被称为“8秒开裂”的损坏。

但是,该报告并没有特别指责所涉及的任何主要方面:开发商Ecove,WSP工程师和建筑商Icon。

据报道,梁上的灌浆不足是另一个问题:

“我们的最终报告证实,许多结构设计和施工问题,包括不遵守国家规范和标准,都是造成Opal Tower损坏的原因。

“根据国家建筑规范和澳大利亚标准,我们发现一些构造良好的滚刀梁和面板组件设计不足,使梁很容易失效。

“我们还发现建筑和材料缺陷可能导致4级和10级滚刀梁的损坏。

“我们认为该建筑整体结构合理,可以纠正建筑物的局部损坏,以确保建筑符合国家建筑规范。”

该报告证实,大多数(如果不是全部)建筑物中的主要柱子都经过精心设计,使其承载能力远远超过预期的负荷。

尽管如此,在该建筑物中的392套公寓中,只有170套公寓被宣布适合占用。许多家庭仍被困在临时住所,可能会持续数周。

一些前居民说他们永远不会回来。

在施工故障的多个发现中:

“在我们的调查期间,以及在我们的临时报告发布之后,我们提供了用于制造滚刀梁的混凝土的强度记录。

“这些混凝土样品的28天强度显示为50 MPa,其中订购了65 MPa的混凝土供应,这表明滚刀中的混凝土也可能具有较低的强度。”

专家建议建立工程师注册和建筑认证数据库,以及结构审查委员会,以更密切地监控建筑缺陷,并为未来的建筑规范提供意见。

“我们原则上同意迄今为止计划的整改工作,并指出自我们的中期报告发布以来,这些已经取得了相当大的进展。

“但是,我们再次呼吁合格的结构工程师在重大整改工程开始前, 和建筑物被认为完全安全入住之前, 详细检查最终设计和施工方案,同时注意到建筑物的重新占用范围超出了我们的范围。

更好的监管部长Matt Kean表示,政府支持这些建议。

规划和住房部长似乎也支持该计划。

“我们将与我们的新建筑专员一起完成今天报告的细节,以确保当房主将钥匙交给新建筑时,它是安全的,结构合理且没有重大缺陷。”

引用: Lonny. (24.02.2019). Opal Tower Final Report: Design And Construction Faults. Retrieved from https://www.propertynerd.com.au/news/opal-tower-final-report-design-and-construction-faults