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Study of a new-type of steel buckling-restrained brace

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 239-256页

作者： Jiang Tao Dai junwu Yang Yongqiang Liu Yongbin Bai Wen Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration Harbin 150080China

The rectangle core plate of all-steel buckling-restrained braces(BRBs) usually exhibit obvious local buckling, due to the lack of longitudinal restraint from the encasing tube. To eliminate the undesirable effects, a novel steel BRB is proposed. In this new-type steel BRB, two T-shaped steels are adopted as the minor restraint elements to restrain the core plate instead of infilled concrete or mortar. Meanwhile, the ingot-iron material with low yielding strength and high elongation is applied to the steel core to study the mechanical properties of steel BRBs. To validate the theoretical requirements for the width-to-thickness ratio of the steel core and the thickness of angle steel, quasi-static tests of eight specimens were conducted. The tests focused on the energy dissipation capacity and failure modes of the proposed steel BRBs. Nonlinear finite element analysis was also carried out to validate the experimental results. Both the aforementioned results imply that appropriately designed steel BRBs can meet the performance requirements for BRB components.

关键词： steel BRB T-shaped steel Ingot-iron energy dissipation capacity failure modes nonlinear fi nite element analysis

Numerical simulation on the seismic performance of retrofitted masonry walls based on the combined finite-discrete element method

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 777-805页

作者： Wu Biye Dai junwu Jin Huan Bai Wen Chen Bowen Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China Guangdong University of Petrochemical Technology Maoming 525000China

Due to the long construction life,improper design methods,brittle material properties and poor construction techniques,most existing masonry structures do not perform well during *** retrofitting method using an external steel-meshed mortar layer is widely used to retrofit existing masonry *** the seismic performance of masonry walls reinforced by an external steel-meshed mortar layer reasonably and effectively is a difficult subject in the research field of masonry *** on the combined finite-discrete elements method,the numerical models of retrofitted brick walls with four different masonry mortar strengths by an external mortar layer are *** shear strength of mortar and the contact between the retrofitted mortar layer and the brick blocks are discussed in *** failure patterns and load-displacement curves of the retrofitted brick walls were obtained by applying low cycle reciprocating loads to the numerical model,and the bearing capacity and the failure mechanism of the retrofitted walls were obtained by comparing the failure patterns,ultimate bearing capacity,deformability and other aspects with the *** study provides a basis for improving the seismic strengthening design method of masonry structures and helps to better assess the seismic performance of masonry structures after retrofitting.

关键词： masonry wall external steel-meshed mortar layer combined finite-discrete element method hysteretic curve ultimate bearing capacity

蓝绿光双波长船载海洋激光雷达系统设计与海上测试

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红外与激光工程 2024年第3期53卷 213-223页

作者：纪鲁峰刘秉义朱培志刘金涛张凯临吴松华唐军武中国海洋大学信息科学与工程学部海洋技术学院山东青岛266100 中国海洋大学海洋高等研究院山东青岛266100 崂山实验室山东青岛266237

海洋水体的光学特性参数是海洋研究关注的重点之一,大部分光学特性具有随深度变化的特征,而海洋激光雷达是有效探测水体剖面信息的技术手段之一。基于水体光学特性参数剖面探测的需求,研制了蓝绿光双波长船载海洋激光雷达系统,光源采用... 详细信息

海洋水体的光学特性参数是海洋研究关注的重点之一,大部分光学特性具有随深度变化的特征,而海洋激光雷达是有效探测水体剖面信息的技术手段之一。基于水体光学特性参数剖面探测的需求,研制了蓝绿光双波长船载海洋激光雷达系统,光源采用在水体中衰减系数较小的蓝绿波长以获取更大的探测深度。该系统具备双波长和偏振探测通道,用于同步获取水体后向散射回波信号和偏振信号,可实现近岸和大洋水体的连续探测。文中首先介绍了激光雷达系统的设计方案,包括发射、接收、采集及控制子系统以及辅助设施,随后对数据预处理方法进行了阐述,包括质量控制、峰值位置对齐、去除背景噪声及退卷积等。系统于近海进行探测实验,验证了激光雷达系统的可靠性。结果显示:在清洁大洋水域,486 nm的激光雷达衰减系数小于532 nm,意味着在开阔水域486 nm具有更好的探测性能。

关键词：海洋激光雷达水体光学特性参数剖面探测激光雷达衰减系数

基于RF-SFLA-SVM的装配式建筑高空作业工人不安全行为预警

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中国安全科学学报 2024年第3期34卷 1-8页

作者：王军武何娟娟宋盈辉刘一鹏陈兆郭婧怡武汉理工大学三亚科教创新园海南三亚572025 武汉理工大学土木工程与建筑学院湖北武汉430070 湖北文理学院土木工程与建筑学院湖北襄阳441053

为有效预警装配式建筑高空作业工人不安全行为的发生趋势或状态,增强对装配式建筑工人不安全行为(PBWUBs)的管控,采用随机森林(RF)-混合蛙跳算法(SFLA)-支持向量机(SVM)模型,开展工人不安全行为预警研究。首先,采用SHEL模型分析处于高... 详细信息

为有效预警装配式建筑高空作业工人不安全行为的发生趋势或状态,增强对装配式建筑工人不安全行为(PBWUBs)的管控,采用随机森林(RF)-混合蛙跳算法(SFLA)-支持向量机(SVM)模型,开展工人不安全行为预警研究。首先,采用SHEL模型分析处于高空作业危险中的PBWUBs的影响因素,并通过RF确定关键预警指标;然后,采用SFLA对SVM的参数进行寻优改进;最后,利用RF-SFLA-SVM预警高空作业PBWUBs,提出应对措施,并与其他预警模型对比。研究结果表明:基于RF-SFLA-SVM预警高空作业PBWUBs,准确率最高,为91.67%,与其他模型的预警性能相比,最高提升14%。研究结果可为高空作业PBWUBs的防控提供参考。

关键词：随机森林(RF) 蛙跳算法(SFLA) 支持向量机(SVM) 装配式建筑高空作业不安全行为

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生物保鲜技术在预调理肉中的应用及展望

食品科技 2024年第4期49卷 156-162页

作者：樊振江孟楠栗亚琼高玉生蒋俊武漯河食品职业学院河南漯河462300 河北科技大学食品与生物学院河北石家庄050018 河北省生猪加工技术创新中心河北石家庄050002

生物保鲜剂是从自然界提取或利用生物工程技术获得的一种新型保鲜剂,具有安全高效、绿色环保等特点,广泛应用在食品工业等领域。随着预制菜产业的兴起,生物保鲜技术在预制肉类食品中的应用变得尤为重要,并吸引越来越多的研究者关注,相... 详细信息

生物保鲜剂是从自然界提取或利用生物工程技术获得的一种新型保鲜剂,具有安全高效、绿色环保等特点,广泛应用在食品工业等领域。随着预制菜产业的兴起,生物保鲜技术在预制肉类食品中的应用变得尤为重要,并吸引越来越多的研究者关注,相关研究结果也层出不穷。文章针对预制肉类食品的腐败变质机制,从不同的来源性探讨生物保鲜技术及其原理,总结了其在预调理肉中的应用研究进展,分析了目前存在的问题,并提出了未来展望。这为生物保鲜技术发展和预制调理肉的保鲜领域提供有益参考和理论依据。

关键词：生物保鲜技术预调理肉腐败机制保鲜机制应用现状

Deep learning-based open API recommendation for Mashup development

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Science China(Information Sciences) 2023年第7期66卷 94-111页

作者： Ye WANG junwu CHEN Qiao HUANG Xin XIA Bo JIANG School of Computer and Information Engineering Zhejiang Gongshang University Software Engineering Application Technology Lab

Mashup developers often need to find open application programming interfaces(APIs) for their composition application development. Although most enterprises and service organizations have encapsulated their businesses or resources online as open APIs, finding the right high-quality open APIs is not an easy task from a library with several open APIs. To solve this problem, this paper proposes a deep learning-based open API recommendation(DLOAR) approach. First, the hierarchical density-based spatial clustering of applications with a noise topic model is constructed to build topic models for Mashup clusters. Second,developers’ requirement keywords are extracted by the Text Rank algorithm, and the language model is built. Third, a neural network-based three-level similarity calculation is performed to find the most relevant open APIs. Finally, we complement the relevant information of open APIs in the recommended list to help developers make better choices. We evaluate the DLOAR approach on a real dataset and compare it with commonly used open API recommendation approaches: term frequency-inverse document frequency, latent dirichlet allocation, Word2Vec, and Sentence-BERT. The results show that the DLOAR approach has better performance than the other approaches in terms of precision, recall, F1-measure, mean average precision,and mean reciprocal rank.

关键词： Mashup development open API recommendation deep learning neural network service discovery

Non-limit passive soil pressure on rigid retaining walls

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International Journal of Mining Science and Technology 2017年第3期27卷 581-587页

作者： Dou Guotao Xia junwu YU Wenjie Yuan Fang Bai Weigang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221008 China Jiangsu Collaborative Innovation Center of Building Energy Saving and Construction Technology Xuzhou 221116 China Zhengzhou Zhongding Steel Structure Engineering Co. Ltd. Zhengzhou 450000 China

This paper aims to reveal the depth distribution law of non-limit passive soil pressure on rigid retaining wall that rotates about the top of the wall(rotation around the top(RT) model). Based on Coulomb theory, the disturbance degree theory, as well as the spring-element model, by setting the rotation angle of the wall as the disturbance parameter, we establish both a depth distribution function for sand and a nonlinear depth distribution calculation method for the non-limit passive soil pressure on a rigid retaining wall under the RT model, which is then compared with experiment. The results suggest that under the RT model: the non-limit soil pressure has a nonlinear distribution; the backfill disturbance degree and the lateral soil pressure increase with an increase in the wall rotation angle; and, the points where the resultant lateral soil pressure acts on the retaining wall are less than 2/3 of the height of the wall. The soil pressure predicted by the theoretical calculation put forward in this paper are quite similar to those obtained by the model experiment, which verifies the theoretical value, and the engineering guidance provided by the calculations are of significance.

关键词： RT model Rigid wall Non-limit passive soil pressure Spring element Genetic algorithm

Preliminary investigation of seismic damage to two steel space structures during the 2013 Lushan earthquake

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Earthquake Engineering and Engineering Vibration 2013年第3期12卷 497-500页

作者： Dai junwu Qu Zhe Zhang Chenxiao Weng Xuran Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsCEA

Severe damage to steel space structures is rarely reported when compared to other structural systems damaged during past major earthquakes around the world. Two gymnasiums of steel space structures in downtown Lushan County that were damaged during the 2013 M7.0 Lushan earthquake in China were investigated and the observations are summarized in this paper. Typical damage to these two steel space structures ranges from moderate to severe. Moderate damage includes global buckling and dislocation of bolted connections of truss members, and inelastic elongation of anchor bolts and sliding of pedestal plates of supports. Severe damage includes member fracture caused by local buckling, and fracture failure of anchor bolts and welds. The distribution of structural damage to these two structures is described in detail and future research opportunities are suggested.

关键词： Lushan earthquake steel space structure gymnasitun seismic damage member buckling fracture failure

不同原料配比棉浆复合绝缘纸的制备与性能研究

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绝缘材料 2024年第5期57卷 61-65页

作者：霍上元薛礼刘俊伍李丹丹刘乾辽宁西电兴启电工材料有限公司辽宁辽阳111000

为提高绝缘成型件、角环等湿法加工绝缘件的韧性及吸油性,加强其装配过程中的工艺可操作性,从而提升变压器的运行可靠性,对不同原料配比棉浆复合绝缘纸的性能进行研究,确定棉浆复合绝缘纸的棉浆比例,然后加工成成品并进行性能测试。结... 详细信息

为提高绝缘成型件、角环等湿法加工绝缘件的韧性及吸油性,加强其装配过程中的工艺可操作性,从而提升变压器的运行可靠性,对不同原料配比棉浆复合绝缘纸的性能进行研究,确定棉浆复合绝缘纸的棉浆比例,然后加工成成品并进行性能测试。结果表明:掺入棉浆体积分数为25%的棉浆复合绝缘纸综合性能最好,使用该原料配比制备的棉浆复合绝缘纸生产的角环、绝缘成型件具有较好的柔韧性及吸油性。

关键词：电力变压器棉浆复合纤维素绝缘纸板棉浆

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