A High-Performance Quadrilateral Flat Shell Element for Seismic Collapse Simulation of Tall Buildings and Its Implementation in OpenSees

Shear walls are important lateral force-resistant components of tall buildings. Hence, a reliable numerical model that can accurately represent the mechanical characteristics and large deformations of shear walls is critical for realistic collapse simulation of tall buildings. Based on the theory of generalized conforming element, a high-performance quadrilateral flat shell element, NLDKGQ, accounting for the large deformation using the updated Lagrangian formulation, is proposed herein and implemented in OpenSees. The reliability of NLDKGQ is validated using classical benchmark problems and reinforced concrete specimens. In addition, its capability in simulating the collapse of a tall building is also demonstrated.     

The impacts of parental migration on children’s subjective well-being in rural china: a double-edged sword

ABSTRACT

The emerging problem of left-behind children has attracted mounting academic and policy attention. Prior studies primarily cast light on left-behind children’s education, health, and behavior, while their subjective well-being is much less understood yet. Based on a nationally representative sample of rural children aged 10–15 in 2014, we examine the impacts of different types of parental migration on children’s subjective well-being and how these affects vary between boys and girls. The results show that parental migration is a double-edged sword: children from both-parent migrant families report compromised life satisfaction and relationship quality compared with those in integral families, and mother-only migration significantly lowers children’s subjective health. On the flip side, father-only migration enhances children’s aspiration for attaining college, an encouraging effect that is even stronger than that of parental education and family income. These effects are heterogeneous by children’s gender: boys seem to be more susceptible to the disruptive effects of both-parent migration; mother-only migration effectively promotes girls’ educational aspiration while father-only migration promotes boys’. This study portrays a comprehensive image of left-behind children. Relaxation of hukou restriction, equal access to education, and revitalization of rural economies are imperative to improve the well-being of left-behind children.

Abbreviations: LBC: Left-behing children; SWB: subjective well-being     

萧何收集整理图书文献之功探微

文献是伴随着文化的创造而产生的。汉代的图书收集与整理主要是由汉武帝倡导,刘向、刘歆父子集大成,但不能忽视开国元勋萧何的奠基之功。文章从保护与利用、收集与创建等方面揭示了萧何对文献学及整个中华文化史作出的贡献。     

河南北宋壁画墓的题材及艺术特色

北宋墓室壁画是宋代绘画的重要组成部分,题材有日常生活、孝行故事、超度升仙和装饰性画面等四类,布局、构图都遵循一定的程式,但构思巧妙、技法多变,体现了北宋绘画艺术的丰富多彩与繁荣昌盛。     

青海省阶梯式旅游模式的探讨

一、问题的提出青藏高原是地球上隆起最高、最年轻的高原,平均海拔4000米以上,有“世界屋脊”和“地球之巅”之称。长期以来,青藏高原以其年轻的地质发展史、活跃的新构造运动、剧烈的环境演变、独特的生物多样性、丰富多彩的自然景观,以及由此孕育的独特的各民族     

Sino–American relations: new changes and new challenges

Sino–American relations encompass a highly complex array of cooperative and competitive dimensions. Recently, they have evolved around the question of ‘China's rise’ or (as Chinese analysts would state it) ‘peaceful evolution’. This article surveys both the cooperative and competitive structural elements of this important bilateral relationship. It tracks recent transitions in that relationship, arguing that China's new-found status as a ‘responsible stakeholder’ in American eyes will present a new set of American expectations and new forms of strategic collaboration that will seriously test both sides’ policy creativity and ability to adapt to a rapidly changing global environment.     

凉州番禾县瑞像故事及造型

本文就番禾县瑞像的由来、发展及其不同时期的表现形式进行了分类探讨并就瑞像的定义提出了新的看法。     

二里头文化陶礼器造型艺术研究

二里头文化陶礼器的造型艺术表现为简洁质朴的艺术风格,这与夏代礼制文化中"尚质"的审美倾向十分吻合。陶礼器的造型艺术由黄金比例、纹饰和仿生三种设计方法以体现陶器造型和装饰的简洁与抽象性,而三至四期动物造型装饰的增多则为商代青铜礼器的艺术形式奠定了基础。酒器和食器的器物造型构成了礼仪中行为与时间的观念,以及动与静的礼仪活动的日常行为规范。而高等级墓葬中的稀有陶器斗笠形器,其造型与古人对天的描述相同,它不仅代表了所葬之人的身份与职能,还是上层社会对天祭祀权力的象征。     

一篇胡适佚文的背景和价值

胡适的英文文章“A Philosopher of Chinese Reactionism”(《中国保守主义的哲学家》)发表在《中国留美学生月报》上.这是一篇佚文,与《胡适日记》提到的文章“Goodnow and Chinese Reactionism”有亲缘关系.它的价值在于反映了袁世凯称帝前胡适对新知识分子的认识水平,是理解胡适的知识分子观以及他处理与国家、政府关系的钥匙,还可从中发现他参与新文化运动的动机.     

转型时期我国城市贫困研究述评

本文基于地理学、规划学和社会学视角,在“过程-互动-行动”研究框架下,统计分析1990年代以来我国城市贫困研究的文献数量和内容演变情况,论述了研究分布与社会经济转型和社会救助政策密切相关。在综合述评每类研究的主要观点基础上,论文指出目前研究存在几方面问题:缺少贫困阶层社会空间研究,缺少与城市发展、城市空间结构的关系研究,缺少对贫困阶层需求和空间资源公平配置的研究,并探讨对未来城市研究的启示。