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Sensitivity analysis and probability modelling of the structural response of a single-layer reticulated dome subjected to an external blast loading

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Defence Technology（防务技术） 2023年第5期23卷 152-163页

作者： Shao-bo Qi Guang-yan Huang Xu-dong Zhi Feng Fan State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Key Lab of Structure Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China

The structural response of a single-layer reticulated dome to external explosions is shaped by many variables,and the associated uncertainties imply non-deterministic *** deterministic methods for predicting the consequences of specific explosions do not account for these ***,the impact of the uncertainties associated with these input variables on the structures’response needs to be studied and *** this study,a parametric uncertainty analysis was conducted ***,local and global sensitivity analyses were carried out to identify the drivers of the structural dynamic response.A probabilistic structural response model was established based on sensitive variables and a reasonable sample ***,some deterministic empirical methods for explosion-resistance design,including the plane blast load model of CONWEP,the curved blast load model under the 50%assurance level,and the 20%mass-increased method,were used for evaluating their *** results of the analyses revealed that the structural response of a single-layer reticulated dome to an external blast loading is lognormally ***,the MB0.5 method based on the curved reflector load model yielded results with a relatively stable assurance rate and reliability,but CONWEP did not;thus,the 1.2MB0.5 method can be used for making high-confidence simple *** addition,the results indicated that the structural response is very sensitive to the explosion *** on these results,it is suggested that for explosion proofing,setting up a defensive barrier is more effective than structural strengthening.

关键词： Dome structure Blast load uncertainty Sensitivity analysis Probabilistic investigation Reliability evaluation

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External blast flow field evolution and response mechanism of single-layer reticulated dome structure

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Defence Technology（防务技术） 2023年第6期24卷 241-253页

Single-layer reticulated dome structure are commonly high-profile building in the public and can be attractive targets for terrorist bombings,so the public can benefit from enhanced safety with a stronger understanding of the behavior of single-layer reticulated dome structure under *** paper investigates the fluid-structure interaction process and the dynamic response performance of the singlelayer reticulated dome under external blast *** experimental and numerical results shown that structural deformation is remarkably delayed compared with the velocity of blast wave,which advises the dynamic response of large-span reticulated dome structure has a negligible effect on the blast wave propagation under *** failure modes are identified by comparing the plastic development of each ring and the residual spatial geometric of the structure,i.e.,minor vibration,local depression,severe damage,and overall *** plastic deformation energy and the displacement potential energy of the structure are the main consumers of the blast *** addition,the stress performance of the vertex member and the deep plastic ratio of the whole structure can serve as qualitative indicators to distinguish different failure modes.

关键词： External blast loading Reticulated dome structure Fluid-structure interaction dynamic response mode Response mechanism

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Optimisation route of embodied carbon emissions and cost of prefabricated buildings: A case study of prefabricated shear wall residential structures

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Energy and Buildings 2025年 343卷

作者： Yifan Dong Qingpeng Man Yadi Zhang Yuan Chang School of Civil Engineering Harbin Institute of Technology Harbin 150001 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150009 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150009 China School of Management Science and Engineering Central University of Finance and Economics Beijing 100081 China

Prefabricated buildings are increasingly replacing traditional cast-in-place concrete structures to reduce construction time and environmental impacts. However, prefabricated components frequently struggle to simultaneously achieve economic cost-effectiveness and carbon emissions reduction. Thus, the construction industry urgently requires component-level technical guidance on prefabricated construction to ensure economic feasibility while also supporting carbon neutrality goals. This study used a typical prefabricated shear wall residential building as a case study to improve the economic and environmental performance of prefabricated building construction. Seven types of structural components are examined, including interior shear walls (ISW) and exterior shear walls (ESW), composite floor slabs (CFS), air-conditioning panels/canopies (A/C), stair landings (SL), beams (BM), and stair flights (SF). By systematically replacing cast-in-place components with their prefabricated counterparts using Revit and Glodon soft tools, the study quantifies and analyses the differences in carbon emissions and costs. The key results are: (i) The optimal replacements for minimising carbon emissions are “BM → SL → SF → CFS → ESW → ISW → A/C,” whereas the most economical cost-effective sequence is “BM → SL → SF → A/C → ISW → ESW → CFS.” (ii) Prefabrication does not universally result in lower carbon emissions. Among the seven types of components, four exhibit higher carbon emissions per unit volume of concrete than their cast-in-place counterparts, with the highest value of CFS (86.2 kg/m 3 ). (iii) To achieve carbon emissions reduction through prefabrication, an optimal prefabrication rate of 3.8–10.6 % is recommended. Within this range, increasing the prefabrication rate results in cost increases while enabling carbon reduction. However, exceeding the 10.6 % cap rate results in both higher costs and carbon emissions compared to traditional cast-in-place methods.

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Creep behavior of reinforced concrete column in consideration of sectional stress redistribution

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Jianzhu Jiegou Xuebao/Journal of Building structures 2016年第5期37卷 264-272页

作者： Zheng, Wenzhong Tang, Can Liu, Yuchen Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

In order to investigate the effect of sectional stress redistribution on creep behavior of axial compressive concrete column, creep experiments were conducted on 12 groups of 100 mm×100 mm×400 mm concrete specimens under variable compressive stress. The effect of key parameters on the creep of reinforced concrete column and the sectional stress redistribution was investigated using the program edited by the MATlab software. The results show that the spring-back strain coefficient is 0.89 when the initial stress level is not larger than 0.35, and the initial stress level decreases with the increase of the initial stress level after the initial stress level is higher than 0.35. The ultimate creep value of axial compression reinforced concrete column decreases with the prolongation of the load age, the increase of longitudinal compression steel reinforcement ratio, section size and relative humidity, the decrease of concrete strength, initial stress level and temperature. The relations between the stable ultimate creep value of axial compression reinforced C20~C50 concrete column and each key parameters were fitted based on the simulation results. © 2016, Editorial Office of Journal of Building structures. All right reserved.

关键词： Axial compression

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Mechanical properties of concrete at low and ultra-low temperatures- a review

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Journal of Infrastructure Preservation and Resilience 2022年第1期3卷 20页

作者： Huo, Yanlin Sun, Huayang Lu, Dong Chen, Zhitao Yang, Yingzi School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

As infrastructure construction advances toward the cold and highland environment, concrete preparation technology and service performance in the cold climate is receiving much attention. The freezing of pore water inside concrete leads to significant changes in its mechanical properties at negative temperatures. Therefore, to ensure the safety of civil engineering structures in cold regions, it is necessary to fully understand the change law and enhancement mechanism of the mechanical properties of concrete and be able to predict mechanical properties at a negative temperature. Since the 1970s, scholars have studied concrete’s negative temperature mechanical properties in different water-content states. This paper presents a comprehensive review of the changes in mechanical properties of concrete at low and ultra-low temperatures and further elucidates the evolution of its compressive strength, tensile strength, flexural strength, elastic modulus, and stress-strain relationship at low temperatures. It was found that the main factors affecting the mechanical properties of concrete at low temperatures were temperature and moisture content. The strength of concrete increases significantly with the decrease in temperature and the increase in moisture content. To better understand and predict the mechanical properties of concrete at low temperatures, the best model was suggested by analyzing the prediction models of different researchers and considering the dispersion of the data. Further, based on the G. Wiedemann pore model, the changes in the internal structure of concrete at low temperatures are described in detail, and the mechanism of its mechanical property enhancement is analyzed. © The Author(s) 2022.

关键词： Compressive strength

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A new multi-coefficients shrinkage model for concrete

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Jianzhu Cailiao Xuebao/Journal of Building Materials 2016年第5期19卷 826-831页

作者： Tang, Can Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China

The contracting experiments were conducted on 69 concrete prisms, which include 5 different strength grades, 2 curing conditions, and 2 humidity environments, and experimental data of concrete shrinkage for 589d were accumulated. The influence coefficients of some factors on the shrinkage of concrete were obtained by normalization and fitting 588 experimental data collected from references. A new multi-coefficients shrinkage model for concrete was proposed based on the formula of influence coefficients and experimental data, which was suitable for the humidity from 10% to 100%, temperature from 5℃ to 80℃, theoretical thickness from 10mm to 500mm, curing time from 1d to 500d, cement content from 190kg/m3 to 500kg/m3, and water-cement ratio(by mass) from 0.35 to 0.70. The calculation results from proposed shrinkage model is agreed well with the experimental data. © 2016, Editorial Department of Journal of Building Materials. All right reserved.

关键词： Concretes

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External blast load factors for dome structures based on reliability

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Defence Technology（防务技术） 2022年第2期18卷 170-182页

作者： Shao-bo Qi Guang-yan Huang Xu-dong Zhi Feng Fan Richard GJFlay State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Key Lab of Structure Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China Department of Mechanical Engineering University of AucklandPrivate Bag 92019Auckland1142New Zealand

Dome structures have been used extensively for industrial,residential,and military ***,it is necessary to understand the damage risk potential for such structures for blast-resistant design *** paper investigates the effect of blast load variability on the design value and the structural dynamic ***,the sources of uncertainty in the external blast load on dome structures were discussed *** based on the probabilistic blast load model for the dome,the rationality of a deterministic mass-increase safety method was *** was found that previous deterministic design method cannot provide a consistent and sound assurance factor or reliability index on the entire dome *** addition,it was also proved that the assurance-based load method fails to ensure compliance with structural safety design standards on the dome roof when compared with the reliability-based blast method.A sensitivity analysis on the probabilistic blast load was conducted,and the results indicate that stand-off distance and explosive mass both act as dominant sources to influence the mean and variability of blast ***,based on the Latin hypercube sampling method,a reliability-based external blast load factor technique was *** technique was further used to estimate structural damage levels of a single-layer reticulated dome under different reliability requirements,associated with a low,medium,and high level of protection grades for a specific explosion scenario,and it indicated that this technique can be useful in the building design to achieve a higher structural anti-explosion *** study herein can serve as a reference for the calculation method of designed blast load.

关键词： Dome structure Airblast variability Deterministic design Assurance factor Reliability-based blast load factor Structural damage levels

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Compressive sensing-based wireless sensors and sensor networks for structural health monitoring

Compressive sensing-based wireless sensors and sensor networ...

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2016 International Conference on Smart Infrastructure and Construction, ICSIC 2016

作者： Bao, Y. Li, H. Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin China Harbin Institute of Technology School of Civil Engineering Harbin China

ISBN: (纸本)9780727761279

Wireless sensor technology-based structural health monitoring (SHM) has been widely investigated recently. This paper presents the new developments and applications of compressive sensing (CS) for wireless sensors and sensor networks-based SHM in our research group. Frist, the group sprse optimization based compressive sensing for data sampling and recovery of wireless sensor network is introduced. Then, the lost data recovery for wireless sensors are presented. CS provides a data loss recovery technique, which can be embedded into smart wireless sensors and effectively increases wireless communication reliability without re-Transmitting the data;the promise of this approach is to reduce communication and thus power savings. To embed into the smart sensor, a method called random demodulator is employed to provide memory and power efficient construction of the random sampling matrix. The program is embedded into the Imote2 smart sensor platform and tested in a series of sensing and communication experiments and field tests. Lastly, the fast moving wireless sensoing technique is presened. For the fast moving wireless data transmission, the Doppler effects are the main reason causing data packet loss. A field test on a cable-stayed bridge is performed to valid the ability of the CS-based robust wireless data transmission approach in obtaining high-quality data for the fast-moving wireless sensing technique. © The authors and ICE Publishing: All rights reserved, 2016.

关键词： Compressed sensing

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Measurement and comparison of snow density on ground and roof 9th

Measurement and comparison of snow density on ground and roo...

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9th International Structural Engineering and Construction Conference: Resilient structures and Sustainable Construction, ISEC 2017

作者： Qingwen, Zhang Zhicheng, Ren Shiyu, Wang Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043748

With the intensification of global climate changing, the human and economic losses caused by snowstorms becomes higher and higher. Harbin, located in the north of China, has the geographical advantage of heavy snowfall, the density and the distribution of snow on the ground and roof were measured. In the aspect of snow density, the snow density on ground and roofs were measured. The snow is divided into three kinds, and the range of snow density is roughly determined. By comparing the two kinds of measurements on both fields, the effects of location, snow thickness and temperature on snow density are specified. Also, the differences of snow density on both ground and roof, new snow and old snow are got. The results show that the old snow density is greater than the new snow density. The snow density of the roof area is obviously larger than that of the ground area;the ground snow density increases with the accumulation of snowfall. Copyright © 2017 ISEC Press.

关键词： Snow

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Post-build concrete wing wall reinforce frame corner column seismic performance experimental

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Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology 2015年第12期47卷 21-25页

作者： Yang, Fan Zheng, Wenzhong Wang, Ying Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

6 specimens of post-build concrete wing wall located two neighboring faces of corner columns were designed and conducted to study the seismic performance of the post-build concrete wing wall reinforce frame corner column. Three test axial compression ratio including 0.31, 0.36, 0.40 was designated for exiting frame corner columns. HRB400 was used as longitudinal steel bar. The ratio of longitudinal reinforcement was 1.23%, 1.05%, 0.82% and stirrup with HPB300 ratio 0.6%. The results of six specimens under cyclic reversing load show that damage degree of the parallel wing wall away from the corner column was significant, while the corner column and the perpendicular wing wall were damaged lighter. Existing column could resist vertical loads and horizontal seismic actions. The wing walls could bear horizontal seismic action and as an effective dissipation energy component. © 2015, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

关键词： Energy utilization

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