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Generalized response displacement methods for seismic analysis of underground structures with complex cross section

Earthquake Engineering and Engineering Vibration 2023年第4期22卷 979-993页

作者： xu zigang Ding Linling Du Xiuli xu Chengshun Zhuang Haiyang Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering East China Jiaotong UniversityNanchang 330013China Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education Beijing University of TechnologyBeijing 100124China

The response displacement method(RDM)is recommended for the seismic analysis of underground structures in the transverse direction for many codes,including bases for design of structures-seismic actions for designing geotechnical works(ISO 23469)and code for seismic design of urban rail transit structures(GB 50909-2014).However,there are some obvious limitations in the application of *** and the shear stress of the soil could be approximately evaluated for the structures having a simple cross section,such as rectangular and circular *** is necessary to propose simplified seismic analysis methods for structures with complex cross *** paper refers to the idea of RDM and proposes three generalized response displacement methods(GRDM).In GRDM1,a part of the soil surrounding a structure is selected to generate a generalized underground structure with a rectangular cross section,and the same analysis model as RDM is applied to analyze the responses of the *** GRDM2,a hollow soil model without a generalized structure is used to compute the equivalent load caused by the relative displacement of the soil,and the soil-structure interaction model is applied to calculate the responses of the *** GRDM3,a continuous soil model is applied to compute the equivalent load caused by the relative displacement and shear stress of the soil,and the soil-structure interaction model is applied to analyze the responses of the structure,which is the same as the model used in *** time-history analysis method(THAM)is used to evaluate the accuracy of the proposed simplified *** show that the error of GRDM1 is about 20%,while the error is only 5%for GRDM2 and *** the three proposed methods,GRDM3 has obvious advantages regarding calculation efficiency and ***,it is recommended to use GRDM3 for the seismic response analysis of underground structures that have conventional simple or complex cross sections.

关键词： underground structures seismic analysis response displacement method equivalent seismic load complex cross section

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Differential rotation of geomagnetic field

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Chinese Science Bulletin 2003年第24期48卷 2739-2742页

作者： WEI zigang & xu Wenyao Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Correspondence should be addressed to Wei zigang (e-mail: magstorm @***) Institute of Geology and Geophysics Chinese Academy of Sciences China

The latitudinal dependence of the westward drift in the main geomagnetic field is examined by using the correlation analysis of moving random pattern. The study reveals the characteristics in the differential rotation of the main field. The results show that the global geomagnetic field drifts westward with an average speed of 0.18/a during 1900—2000. The westward drift rate is not symmetrical with re-spect to the equator. The maximum westward drift rate, 0.31/a, occurs at the latitude j = -15? forming a Rapid Westward Drift Belt (RDB) around this latitude. Going northward and southward from this belt, the drift rate de-creases and reaches the minimum (0.12/a) at j = 50?and the minimum (0.14/a) at j = -56? forming a Northern Hemi-sphere Slow Westward Drift Belt (N-SDB) and a Southern Hemisphere Slow Westward Drift Belt (S-SDB). Three phases can be detected in the evolution of the westward drift. In the first phase (1900—1940), the RDB dominates the global drift pattern. The westward drifts in this belt are much faster than those in other areas. In the second phase (1940—1960), the drift rates in the RDB are less than those in the first phase, while the drifts in the N-SDB and S-SDB are relatively large. In this phase, the differential rotation becomes less obvious. In the third phase (1960—2000), the westward drift in the RDB increases again and the differen-tial rotation gradually becomes apparent.

关键词：地磁场赤道快速西移带 RDB

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MICROWAVE-ASSISTED DIGESTION COUPLED WITH AAS AND ICP-MS FOR THE DETECTION OF THE ELEMENTS IN THREE KINDS OF EDIBLE CHINESE TRADITIONAL MEDICINE

MICROWAVE-ASSISTED DIGESTION COUPLED WITH AAS AND ICP-MS FOR...

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第十二届北京分析测试学术报告会暨展览会(BCEIA 2007)

作者： Yi ZHANG zigang xu Mirao TANG Department of chemistry Yuquan campus Zhejiang University

A simple,robust and reliable method has been developed for the determination of five macro-elements Na,K,Ca,Mg,Fe and fifteen micro-elements V,Cr,Mn,Co,Ni,Cu,Zn,Ge,As,Se,Sr,Mo,Cd,Hg,Pb in three kinds of valuable edible Chinese Traditional Medicine,whose names are Tremella aurantialba,Grifola frondosus and Actinidia Chinensis *** sample approximately 20

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The update of treatment strategies in pediatrics with generalized pustular psoriasis in China

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Pediatric Investigation 2023年第3期7卷 191-198页

作者： Yunliu Chen Xin Xiang Zhaoyang Wang Chaoyang Miao zigang xu Department of Dermatology Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijingChina

Generalized pustular psoriasis(GPP)is a severe subtype of psoriasis,commonly combined with systemic *** mutations have been found to be associated with GPP and vary by *** treatments are usually required for the severity and potential complications of ***,there is no common consensus in China,especially among pediatric patients,whose data are ***,methotrexate,and cyclosporine are widely used in pediatrics with GPP,while the adverse effects should be *** emergence of different biological agents brings us into a new *** article discusses the genetic background of Chinese patients and demonstrates the evidence of treatment in pediatrics with GPP.

关键词： Generalized pustular psoriasis Pediatrics Treatment

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SIMULTANEOUS DETERMINATION OF CHROMIUM(Ⅲ) AND CHROMIUM(Ⅵ) BY ION CHROMATOGRAPHY WITH INDUCTIVELY COUPLED PLASMA-MASS SPECTROMETRY

SIMULTANEOUS DETERMINATION OF CHROMIUM(Ⅲ) AND CHROMIUM(Ⅵ) ...

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第十一届北京分析测试学术报告会暨展览会(BCEIA 2005)

作者： Qi Yao zigang xu Yan Zhu Min Zhu Department of Chemistry Yuquan campusZhejiang University Department of Chemistry Xixi campusZhejiang University

There is an increasing demand for the development of analytical methods,not only to determine toxic elements in environmental samples,but also to characterize the distribution of species in different *** is necessary ...

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柳氮磺胺吡啶治疗儿童线状IgA大疱性皮病四例

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中华皮肤科杂志 2017年第11期50卷 847-849页

作者：徐哲徐子刚国家儿童医学中心北京100045 首都医科大学附属北京儿童医院皮肤科

线状IgA大疱性皮病（linear IgA bullous dermatosis，LABD）是一种罕见的累及皮肤黏膜的获得性表皮下水疱病，以学龄前儿童为多。本病病因不清，可能的诱因包括药物反应（如万古霉素）、感染和免疫性疾病等。目前国内外没有大样本的治... 详细信息

线状IgA大疱性皮病（linear IgA bullous dermatosis，LABD）是一种罕见的累及皮肤黏膜的获得性表皮下水疱病，以学龄前儿童为多。本病病因不清，可能的诱因包括药物反应（如万古霉素）、感染和免疫性疾病等。目前国内外没有大样本的治疗经验，治疗缺乏统一标准，一般使用氨苯砜、糖皮质激素和磺胺类药物治疗。我科于2015—2016年收治4例，尝试口服柳氮磺胺吡啶治疗，取得很好的疗效，报道如下.

关键词：线状IgA大疱性皮病柳氮磺胺吡啶药物治疗学龄前儿童免疫性疾病糖皮质激素皮肤黏膜 LABD

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Successful treatment of a female pediatric patient with carbamazepine-induced toxic epidermal necrolysis: Active wound care and systemic therapy

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Pediatric Investigation 2018年第2期2卷 114-118页

作者： Yuan Liang Yan Chu zigang xu Lin Ma Department of Dermatology Beijing Children's Hospital Capital Medical University National Center for Children's Health Beijing China

We describe a 6-year-old female patient who developed carbamazepine-associated toxic epidermal *** active wound care,systemic methylprednisolone and intravenous immunoglobulin pulse therapies and multidisciplinary supportive care,the patient improved *** case indicates that improving the management of Stevens-Johnson syndrome/Toxic epidermal necrolysis patients requires attention not only to the process of wound management but also to individual supportive care and active therapeutic *** through this can standardized care,including muco-cutaneous and visceral wound care,be delivered to provide high-quality care with improved clinical prognosis and quality of life.

关键词： Drug reaction Wound care Toxic epidermal necrolysis

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考虑土-结构相互作用的弹簧-地下结构体系静力推覆试验技术及其试验研究

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建筑结构学报 2023年第1期44卷 248-258页

作者：许成顺韩润波杜修力许紫刚北京工业大学城市与工程安全减灾教育部重点实验室北京100124 华东交通大学江西省岩土工程基础设施安全与控制重点实验室江西南昌330013

地下结构静力推覆试验由于具有模型结构尺寸较大、应力水平可控等优点,适用于研究抗震性能问题。为了解决考虑土-结构相互作用的土-地下结构体系静力推覆试验过程复杂、费用昂贵的问题,研究了试验过程相对简单、可近似考虑土-结构相互... 详细信息

地下结构静力推覆试验由于具有模型结构尺寸较大、应力水平可控等优点,适用于研究抗震性能问题。为了解决考虑土-结构相互作用的土-地下结构体系静力推覆试验过程复杂、费用昂贵的问题,研究了试验过程相对简单、可近似考虑土-结构相互作用的弹簧-地下结构体系静力推覆试验技术,通过引入弹簧单元模拟结构所受初始土压力及推覆过程中的土-结构相互作用,通过压缩模型两侧弹簧及施加竖向均布荷载以模拟结构所受初始土压力,通过限制模型底部水平位移,并在模型侧顶部作用水平推力将模型自初始状态推至破坏以模拟结构所受水平地震作用。以1995年日本阪神地震中破坏的Daikai车站为原型,制作几何缩尺比为1/5的模型,基于上述试验装置设计了详细的试验方案,开展弹簧-地下结构体系静力推覆试验以验证该试验方法的可行性。通过试验得到模型受力全过程剪力-层间位移能力曲线、模型结构裂缝发展部位及结构破坏形态,分析试验结果可知,在地震作用过程中,周围土体对地下结构的约束作用明显,周围土体的存在提高了地下结构的抗侧向倒塌能力,中柱是模型结构的薄弱构件。

关键词：地下结构土-结构相互作用试验技术弹簧-地下结构体系静力推覆试验

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Prediction of Potential Distribution of the Genus Cricotopus(Diptera:Chironomidae)Based on MaxEnt Model

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Agricultural Biotechnology 2023年第6期12卷 39-44,47页

作者： zigang xu Yuanyuan YAO Qing CHEN Panpan XIANG Jingru SHANGGUAN Shiwang LIU Yue FU College of Agriculture Yangtze UniversityJingzhou 434023China Hubei Key Laboratory of Economic Forest Germplasm Improvement and Resources Comprehensive Utilization Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie MountainsHubei Zhongke Research Institute of Industrial TechnologyCollege of Biology and Agricultural ResourcesHuanggang Normal UniversityHuanggang 438000China Tianjin Natural History Museum Tianjin 300061China

The prediction of suitable area is a method for predicting the potential distribution by using the maximum entropy *** study predicted the potential suitable habitats for the genus Cricotopus of Chironomidae in *** latitude and longitude information of 98 distribution sites of Cricotopus in China and the biological environmental factors and altitude distribution in China were collected,and suitable habitats for Cricotopus were predicted,obtaining the suitable ranges and areas of Cricotopus in China,which is consistent with the known living conditions of *** study on the diversity of Cricotopus and the prediction of its suitable habitats provide a theoretical basis for Cricotopus in water monitoring and paddy fields,as well as basic data for the study on the genus Cricotopus.

关键词： Cricotopus Diversity Prediction of suitable area Geographical distribution

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地下结构地震反应的主要特征及规律

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土木工程学报 2018年第7期51卷 11-21页

作者：杜修力康凯丽许紫刚李洋许成顺北京工业大学城市与工程安全减灾教育部重点实验室北京100124

目前,有关地下结构地震反应特征的一些重要的规律性认识仍然缺乏严格的理论推断或认识欠深入。文章基于地下结构地震反应的二维动力有限元数值分析模型,定量分析了场地土、结构以及土-结构体系的动力特性和土-结构柔度比对地下结构地震... 详细信息

目前,有关地下结构地震反应特征的一些重要的规律性认识仍然缺乏严格的理论推断或认识欠深入。文章基于地下结构地震反应的二维动力有限元数值分析模型,定量分析了场地土、结构以及土-结构体系的动力特性和土-结构柔度比对地下结构地震反应的影响。结果表明,对于地下结构而言,土-结构体系的动力特性主要受控于场地土的动力特性,地下结构地震反应主要取决于场地土的动力特性或基岩地震运动引起的场地土的体积惯性力和土-结构柔度比;结构顶底板水平最大相对位移、关键构件截面弯矩随着土-结构柔度比分别单调减小和增大,结构关键构件截面的剪力、轴力值和土-结构接触面的最大平均剪力系数随着土-结构柔度比的增大变化较复杂。

关键词：地下结构地震反应特征动力特性土-结构柔度

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