监测历史悠久的哈佛体育场

作者：T/F/D

哈佛体育场于1904年完成，于1987年获得了国家历史地标地位。。正如预期的是，对于拥有开创性的建筑技术的100多年建筑物，持续的腐蚀需要持续进行，因此，由此产生的维护成本很高。其所有者哈佛大学需要对维护预算做出年度决定。2018年哈佛大学结构工程公司西尔曼for advice. To help guide Harvard to make appropriate decisions on the life-safety of the stadium, Silman developed a customised material testing and monitoring strategy. This included Leica Geosystems total stations and software, which collects real-time data about the building’s performance to inform recommendations about the landmark’s future.

维护向前通行证的房屋

哈佛体育场在文化和建筑上都是重要的。体育场的尺寸甚至是美式足球发展的一个因素。1906年，一个学院委员会开会了规则，以使早期比赛更安全，一个建议是使球场更大。然而，哈佛体育场最近完成了，无法扩大。因此，该提议被拒绝，而支持允许前进。体育场是一个具有里程碑意义的建筑，是第一个使用钢筋结构混凝土的垂直混凝土结构。哈佛土木工程教授刘易斯·杰罗姆·约翰逊（Lewis Jerome Johnson）当时是该创新的工程师。

The Stadium is much loved and much visited. Yet, if left unattended, it can become an expensive building to maintain and keep safe. Justin Den Herder, Associate at Silman, explains, “because of the nascency of this construction technology, there were significant concerns that were not known by the engineers or contractors at the time; such as the need for expansion joints, lack of appropriate re-bar detailing, dowels and ties between structural elements or insufficient concrete cover, and even the chemical make-up of the concrete itself was found to be problematic. All of these issues contributed significantly to the rate and level of deterioration.”

数据驱动的维护决策方法

哈佛大学每年都需要平衡地标的价值与维修成本。监视项目的目的是采用其他数据驱动的决策方法。丹·赫德（Den Herder）说：“我们的角色基本上是通过材料和电化学测试以及实时光学和振动监控的结合来获取更多信息，以更好地了解建筑物的季节性行为，因此帮助哈佛对未来做出了更明智的决定体育场。”

西尔曼worked with partnerGeotech Instrumentsto devise the monitoring system. It included crack monitors, tilt monitors, a weather station and fiveLeica Nova TM50总亚博5分钟快三站。Leica GeoMoS Monitor用于数据获取和处理，Leica Geomos调整用于网络调整和现在，Leica Geomos！for data visualisation and analysis. Den Herder explains, “We wanted to monitor the building almost in real-time to understand how it was expanding or contracting under different meteorological conditions and different loading conditions. Scott Kavalek, Geotech Instruments, chose Leica Geosystems instruments with imaging functionality and “helped us define the points that we wanted to monitor to achieve that.”

查明体育场的热点

来自裂纹和倾斜监视器的数据是通过Microsoft产品通过岩土仪器处理的。亚搏彩票手机版下载相反，来自总站和天气数据的光学监视数据是通过Leica软件处理的。亚博5分钟快三Silman现在使用Leica Geomos！将数据分类为感兴趣的时间段，以查看体育场地区的移动方式。该软件生成的图表被导出为易于阅读的报告，可以与哈佛大学讨论。比较不同的监视组件使团队详细介绍了建筑物的漏洞。丹·赫德（Den Herder）说：“从光学监视结果解释地理系统数据的有用是，我们能够查明与建筑物其余部分相对于建筑物的移动更多的热点或建筑物的移动。”建筑物移动最多的区域可以与更多的裂缝和腐蚀相关联

Making decisions based on the right information

根据数据，Silman团队可以预测和解释裂缝，并建议在哪里维修会产生最大的影响。“我们能够确定建筑物在哪里移动的位置，并预测需要维修或关节的位置。例如，在体育场的上层，相对于直接下方的地板，有四分之三的运动水平运动。这几乎总是对应于建筑物的破裂，剥落和恶化，因为水可以进入这些裂缝并开始腐蚀和恶化的材料。”

Stewardship of a National Historic Landmark is a challenging role. Fans of the Stadium would want it to last as long as its Ancient Roman inspiration. Yet making a 100-year old building meet modern safety standards comes at a high cost. One that needs justification. As Den Herder at Silman says, “We would love to find a way to ensure that the Stadium can remain useful and safely occupiable, so that’s our goal. But ultimately, we just want to present the hard data and draw appropriate conclusions from the right information.”

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