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Effects of green roof damping and configuration on structural seismic response

《结构与土木工程前沿（英文）》页码 1133-1144 doi: 10.1007/s11709-023-0959-9

摘要： Sustainable structures are critical for addressing global climate change. Hence, their structural resilience or ability to recover from natural events must be considered comprehensively. Green roofs are a widely used sustainable feature that improve the environment while providing excellent occupant amenity. To expand their usage, their inherent damping and layout sensitivity to seismic performance are investigated in this study. The soil of a green roof can serve as a damper to dissipate the energy generated by earthquakes or other dynamic events. Results of preliminary analysis show that a green roof soil can increase localized damping by 2.5% under both dry and saturated conditions. Based on these findings, nonlinear time-history analyses are conducted on a three-story building in SAP2000 to monitor the structural behavior with and without a green roof. The increased damping in the green roof soil is beneficial to the structural performance, i.e., it reduces the building displacement and acceleration by 10% and 12%, respectively. Additionally, certain configurations are more effective and beneficial to the structural response than others, which suggests the possibility of design optimization. Based on the findings of this study, new methods of modeling and considering green roofs in structural design are established.

关键词： green infrastructure green roof structural resilience seismic design

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Fragility assessment of wood sheathing panels and roof-to-wall connections subjected to wind loading

《结构与土木工程前沿（英文）》 2021年第15卷第4期页码 867-876 doi: 10.1007/s11709-021-0745-5

摘要： The performance of the wood-frame buildings after tornadoes has shown that the majority of the wind damage resulted from building envelope failure most typically due to the loss of the roof. To assess the performance and the reliability of low-rise wood-frame residential buildings with a focus on the roofs, fragility analysis can be used to estimate the probability of failure of a roof when constructed with specified nails and sheathing sizes. Thus, this paper examines the fragility of specific types of nails, roof-to-wall (RW) connection details, and sheathing sizes based on the damaged roofs that were previously assessed in the Dunrobin area in Ottawa (Ontario) that was hit with an Enhanced Fujita (EF3) tornado on September 21, 2018. The presented fragility analysis considers four scenarios, including different sheathing and nail sizes. Dead loads, wind loads, and resistance on the sheathing panels were compiled and analyzed to determine the failure of the examined roofs. The eight fragility models suggest that the safest roof sheathing (RS) is the 1.22 m × 1.22 m sheathing panel with 8 d nails, and the safest RW connections is achieved by using H2.5 hurricane clips.

关键词： tornadoes wind loads low-rise buildings fragility analysis risk assessment structural failures

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Collapse fragility assessment of steel roof framings with force limiting devices under transient wind

Linjia BAI, Yunfeng ZHANG

《结构与土木工程前沿（英文）》 2012年第6卷第3期页码 199-209 doi: 10.1007/s11709-012-0168-4

摘要： Steel structural frame is a popular structural form to cover large-span roof space and under high winds. Either part of the roof enclosure or the entire roof structure can be lifted off a building, particularly for low sloped roofs subject to wind-induced suction force. Collapse of roof could cause severe economic loss and poses safety risk to residents in the building. The buckling of members in a steel roof frame structure, which may lead to progressive collapse, may be dynamic in nature. This paper presents a fragility analysis of the collapse of steel roof frame structures under combined static and transient wind loading. Uncertainties associated with wind load change rate and member imperfections are taken into account in this study. A numerical example based on a Steel Joist Institute (SJI) K series joist was used to demonstrate the use of force limiting devices for collapse risk mitigation. For the presented fragility assessment of steel roof collapse, a Monte Carlo method combined with response surface approach was adopted, which greatly reduces the computation time and makes the Monte Carlo simulation feasible for probabilistic collapse analysis of steel roof frame structures.

关键词： collapse dynamic response fragility analysis Monte Carlo simulation wind load

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三峡升船机顶部机房钢屋架设计与施工

孙昌忠

《中国工程科学》 2013年第15卷第9期页码 33-39

摘要：

根据三峡升船机顶部机房钢屋架的使用要求，研究分析了钢屋架的结构形式，通过建立三维有限元模型验证了钢屋架结构形式及其设计方案在施工阶段的结构安全性。同时，通过对钢屋架施工方案的研究，制定了适合三峡升船机顶部机房钢屋架施工作业环境的施工程序以及施工设备选型，对钢屋架施工过程中钢桁架分段、格构支撑架的设置、钢桁架吊装、中控室屋面网架安装、屋面板安装等环节提出了针对性的施工方法。三峡升船机顶部机房钢屋架所采用的结构设计方法与施工方案确保了钢屋架的顺利安装与安全运行，对类似工程具有一定的参考价值。

关键词：升船机机房钢屋架设计施工三峡工程

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Lifting installation and prestressed cable construction of suspendome roof for Wuhan Gymnasium

GUO Zhengxing, SHI Kairong, LUO Bin, TIAN Qiliang, WU Julong, BI Shuiyong

《结构与土木工程前沿（英文）》 2008年第2卷第1期页码 87-92 doi: 10.1007/s11709-008-0005-y

摘要： The steel roof of Wuhan Gymnasium is a long-span suspendome structure system. According to the structural characteristics of the roof, the lifting installation of upper latticed shell and the installation and tension of lower prestressed cables are introduced in detail. The cable tension is completed successfully on June 27, 2006, while the test results of cable forces and structural deformation are comparatively consistent with the theoretical analysis results. Moreover, Strut-adjustment Method is innovated and applied successfully in the construction of long-span suspendome structure for the first time, and the theoretical and practical experiences can be used for the research and application of similar new-type spatial structures.

关键词： practical new-type installation consistent Gymnasium

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Strength of tubular welded joints of roof trusses in Shanghai Qizhong Tennis Center

TONG Lewei, GU Min, CHEN Yiyi, ZHOU Liying, SUN Jiandong, CHEN Yangji, LIN Yingru, LIN Gao

《结构与土木工程前沿（英文）》 2008年第2卷第1期页码 30-36 doi: 10.1007/s11709-008-0010-1

摘要： Static strength of multi-planar welded joints with seven brace members and one chord member made of circular hollow sections is investigated in the paper, based on the engineering practice of moveable roof trusses of Shanghai Qizhong Tennis Center. Firstly, comparative experiments were carried out on two model joints with a scale of 1:3. One joint was not reinforced, whereas the other was reinforced with ring stiffeners inside the chord member. Failure mode, stress distribution, plastic-zone development and ultimate load capacity of the joints were investigated, and effects of the ring stiffeners on the joint behavior were observed through the experiments. Secondly, finite element analysis of both the tested model joints was performed. The calculation results are in a good agreement with the experimental results, which indicated that the numerical analysis was quite effective. Finally, the strategy for enhancing strength of the complicated joint is discussed. Parameters study on the constructional details of ring stiffeners was carried out using FE method. The present research shows the multi-planar circular hollow section joint with high ratio of diameter to thickness of the chord and multiple braces is liable to chord plasticity under axial tension and compression on the braces. For the design of the joint, it is suggested that the ring stiffeners are installed insider the chord to meet needs of enough stiffness and strength. Both position and number of the stiffeners should be carefully determined based on the axial forces on the braces and their diameters. The stiffener thickness should not be less than the chord thickness, and the diameter of the hole at the center of the stiffener should not be greater than half of the chord diameter.

关键词： diameter numerical analysis calculation thickness engineering

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浅埋大跨黄土隧道管棚受力机制分析

李健,谭忠盛,喻渝,倪鲁肃

《中国工程科学》 2011年第13卷第9期页码 92-96

摘要：

以郑西客运专线阌乡隧道为依托工程，进行浅埋大跨黄土隧道长大管棚受力机制的研究。对隧道进入下穿高速公路前的管棚纵向变形进行现场监测，根据测试结果分析管棚在隧道开挖过程中的受力特性，得到浅埋黄土隧道长大管棚受力变形规律：掌子面前方约15 m处管棚开始受力，掌子面过后约15 m管棚的受力趋于稳定，管棚的纵向变形总体上呈凹槽形分布，掌子面处管棚受力最大。通过有限差分程序FLAC3D计算不同管棚参数条件下的施工方案，为隧道下穿段管棚工法及施工方案的优化设计提供理论依据，并在下穿段沉降监测中得到验证。

关键词：浅埋暗挖下穿施工黄土隧道管棚变形监测受力机制

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我国综采放顶煤开采技术及其展望

赵经彻

《中国工程科学》 2001年第3卷第4期页码 9-16

摘要：

介绍了20世纪80年代中期以来对我国煤炭工业有重大影响的综采放顶煤开采技术的概况；论述了我国科技人员在该项技术进步中在顶煤可放性评价、岩（煤）运动规律及支架围岩关系、提高回收率的技术和工艺、安全控制、大功率成套设备研制等方面的创造性贡献；对综采放顶煤技术的发展趋势作出了评价。

关键词：煤炭开采综采放顶煤顶板管理资源回收率煤矿安全

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Innovation Ecosystem for Green Smart City Building in China

Jin Chen

《工程管理前沿（英文）》 2015年第2卷第4期页码 325-330 doi: 10.15302/J-FEM-2015058

摘要： Green Smart City (GSC), is one of the new types of cities which integrates eco-concepts and information technologies. As GSC construction is a resource intensive process, it requires a large amount of knowledge, information, talent and capital. Thus, setting up an innovation ecosystem is an astute way to promote the construction of a GSC. This paper, based on the case study by the Insigma Group, tries to explore the rules of innovation ecosystem building for the construction of GSCs in China.

关键词： green smart city resource innovation ecosystem building

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浅埋深两硬条件下特厚煤层综放开采技术

张忠温,吴吉南

《中国工程科学》 2011年第13卷第11期页码 107-112

摘要：

针对平朔矿区4号煤层条件，采用理论分析方法研究了浅埋深两硬条件下4号煤层顶煤的冒放性及合理采煤方法。以提高顶煤冒放性为目标，采用数值模拟的方法进行了综放工作面参数及设备选型配套研究。实践表明，浅埋深两硬煤层条件下通过加大综放工作面长度与割煤高度，可以实现安全、高效、高回收率开采。

关键词：浅埋深两硬煤层顶煤冒放性大采高综放

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Potential advantages in combining smart and green infrastructure over silo approaches for future cities

Yamuna KALUARACHCHI

《工程管理前沿（英文）》 2021年第8卷第1期页码 98-108 doi: 10.1007/s42524-020-0136-y

摘要： Cities are incorporating smart and green infrastructure components in their urban design policies, adapting existing and new infrastructure systems to integrate technological advances to mitigate extreme weather due to climate change. Research has illustrated that smart green infrastructure (SGI) provides not only climate change resilience but also many health and wellbeing benefits that improve the quality of life of citizens. With the growing demand for smart technology, a series of problems and challenges, including governance, privacy, and security, must be addressed. This paper explores the potential to transition from grey, green, or smart silos to work with nature-based solutions and smart technology to help change cities to achieve considerable environmental and socio-economic benefits. The concepts of grey, green, and smart infrastructure are presented, and the needs, benefits, and applications are investigated. Moreover, the advantages of using integrated smart, green nature-based solutions are discussed. A comprehensive literature review is undertaken with keyword searches, including journal papers, stakeholder and case study reports, and local authority action plans. The methodology adopts multimethod qualitative information review, including literature, case studies, expert interviews, and documentary analysis. Published data and information are analysed to capture the key concepts in implementing SGI systems, such as storm-water control, flood and coastal defense, urban waste management, transportation, recreation, and asset management. The paper investigates the elimination of silo approaches and the alleviation of the destructions caused by extreme weather events using these interdependent SGI systems supported by novel data-driven platforms to provide nature-based solutions to boost the health and wellbeing of the residents.

关键词： grey infrastructure green infrastructure smart infrastructure smart and green combined infrastructure smart cities future cities

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China’s Agriculture Green Development: from Concept to Actions

《农业科学与工程前沿（英文）》 doi: 10.15302/J-FASE-2023512

摘要：

● A target-threshold indicator evaluation system is proposed to measure China’s agriculture transformation.

关键词： agricultural transformation Agriculture Green Development historical trend indicator system theoretical conception

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Toward Agriculture Green Development

Oene OENEMA

《农业科学与工程前沿（英文）》 2020年第7卷第1期页码 110-111 doi: 10.15302/J-FASE-2019314

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From Green to Sustainability—Trends in the Assessment Methods of Green Buildings

Steve Hsueh-Ming Wang,Paula Williams,Jing Shi,Huojun Yang

《工程管理前沿（英文）》 2015年第2卷第2期页码 114-121 doi: 10.15302/J-FEM-2015018

摘要： This research investigates recent developments in assessment methods of green buildings and compares the differences in rating systems among the United Kingdom, USA, and Germany. There are indications that the rating systems are moving from green buildings to sustainable buildings. In order to understand the recent research in academic areas, we survey the recent Ph.D. dissertations and literature related to green building assessment. Discussion is provided on the major research areas of green buildings, which cover accountability of life cycle cost, methodology for balancing the three pillars, and government vision and public policy.

关键词： green sustainability buildings assessment methods rating systems

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APPLICATION AND DEVELOPMENT OF ‘GREEN’ PREVENTIVE AND CONTROL TECHNOLOGIES IN GUIZHOU TEA PLANTATIONS

《农业科学与工程前沿（英文）》 2022年第9卷第1期 doi: 0.15302/J-FASE-2021424

摘要：

The application and development of ‘green’ preventive technologies in tea plantations is an important means of ensuring tea quality and ecological safety. Ecological, agronomic and biological controls are the main preventive measures used in Guizhou Province. This paper summarizes the ‘green’ preventive technologies being applied in Guizhou tea plantations, including the use of plant defense inducers to regulate tea plant responses to pathogens, natural enemies to control pest species causing damage to shoots and Trifolium repens to control the main weed species. In addition, it summarizes the integrated ‘green’ preventive technologies being used in Guizhou and provides a foundation for the ecological maintenance of tea plantations.

关键词： ‘green’ prevention / natural enemies / plant defense inducers / tea plantations / Trifolium repens

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标题作者时间类型操作

Effects of green roof damping and configuration on structural seismic response

期刊论文

Fragility assessment of wood sheathing panels and roof-to-wall connections subjected to wind loading

期刊论文

Collapse fragility assessment of steel roof framings with force limiting devices under transient wind

Linjia BAI, Yunfeng ZHANG

期刊论文

三峡升船机顶部机房钢屋架设计与施工

孙昌忠