Monitoring historic Harvard Stadium

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Harvard Stadium, which was completed in 1904, gained National Historic Landmark status in 1987. It was the first of many college football stadiums built in a U-shaped Colosseum style and the first construction using reinforced cast-in-place concrete on such a scale. As expected for a 100+ year old building with a pioneering construction technology, there is on-going corrosion to be contended with and the resulting maintenance costs are high. Its owner, Harvard University, needs to make annual decisions about the maintenance budget. In 2018 Harvard contracted structural engineering firmSilman咨询。为了帮助指导哈佛，对体育场的生命安全做出适当的决定，Silman制定了定制的材料测试和监测策略。这包括Leica Geosystems的总站和软件，它收集了有bob apple关建筑物绩效的实时数据，以为建议的未来推荐建议。

Maintaining the home of the forward pass

Harvard Stadium is significant both culturally and architecturally. The dimensions of the stadium were even a factor in the evolution of American football. In 1906, a committee of colleges and universities met to set rules to make the early game safer and one suggestion was to make the pitch wider. The Harvard Stadium however was recently finished and could not be widened. Thus, the proposal was rejected in favour of allowing forward passing. A landmark piece of architecture, the Stadium is the first vertical concrete structure to use reinforced structural concrete. Lewis Jerome Johnson, professor of civil engineering at Harvard was the engineer responsible for the innovation at the time.

体育场很爱，很远。然而，如果无人看管，它可以成为维护和保持安全的昂贵建筑。贾斯汀登记牧师，在Silman助理，解释说，“由于这种施工技术的纳粹感觉，工程师或承包商当时没有明显的担忧;如需要扩展关节，缺乏适当的重新杆细节，结构元件或混凝土覆盖不足之间的销钉和关系，甚至发现混凝土本身的化学构成也是有问题的。所有这些问题都贡献了劣化的速度和水平。“

Data-driven approach to maintenance decisions

Every year Harvard University needs to balance the value of the landmark with the cost of repair. The purpose of the monitoring project was to pursue an additional data-driven approach to decisions. Den Herder says, “Our role was basically to get more information through a combination of material and electrochemical testing as well as real-time optical and vibration monitoring to better understand the buildings seasonal behaviour and therefore help Harvard make a more informed decision about the future of the stadium.”

Silman与合作伙伴合作土工学仪器设计监控系统。它包括裂缝监视器，倾斜显示器，气象站和五个Leica Nova TM50 total stations。徕卡地质摩托车显示器was used for data acquisition and processing,Leica GeoMoS Adjustmentfor the network adjustment andLeica GeoMoS Now!用于数据可视化和分析。登记牧师解释说：“我们希望实时监控建筑物，了解如何在不同的气象条件和不同的装载条件下扩大或收缩。斯科特卡瓦尔克，土工科技仪器，选择了徕卡土工系统的仪器，具有成像功能，并帮助我们定义了我们想要监控的点以实现这一目标。“

Pinpointing the Stadium's hotspots

Data from the crack and tilt monitors was processed by Geotech Instruments using Microsoft products. In contrast, the optical monitoring data from the total stations and the weather data was processed via Leica software. Using Leica GeoMoS Now!, Silman sorted the data into the time periods of interest to look at how areas of the Stadium had moved. The software generated graphs which were exported as easy-to-read reports to discuss with Harvard University. Comparing the different monitoring components gave the team a detailed picture of the building’s vulnerabilities. Den Herder says, “What’s useful about interpreting the geosystems data from the optical monitoring results is that we’re able to pinpoint the hotspots or the portions of the building that are moving more, relative to the rest of the building.” The areas of the building that are moving the most can be correlated to the areas with more cracks and corrosion

根据正确的信息做出决定

Based on the data, the Silman team can predict and explain cracks and suggest where repairs will have the most significant impact. “We are able to determine where the building is moving most and predict where repairs or joints would be needed. For example, at the upper level of the stadium, there is three-quarters of an inch of movement horizontally relative to the floor directly below that. That pretty much always corresponds to cracking and spalling and deterioration of the building because water can get into those cracks and start to corrode and deteriorate materials.”

国家历史标志性标志的管理是一个具有挑战性的作用。体育场的粉丝希望它能够持续到古老的罗马灵感。然而，制造100岁的建筑符合现代安全标准以高成本。一个需要理由的一个。正如Silman在Silman所说的那样，“我们很乐意找到一种方法来确保体育场能够保持有用和安全的可取性，所以这就是我们的目标。但最终，我们只想介绍硬数据并从正确的信息绘制适当的结论。“

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