Experimental Investigation on the Seismic Behavior of the Semi-Rigid One-Way Straight Mortise-Tenon Joint of a Historical Timber Building

ABSTRACT

This article aims to disclose that the deformation and damages of the one-way straight mortise-tenon (OWSMT) joint, the key force transmission connection of traditional wood buildings, lead to a significant reduction in structural safety of ancient timber structure. For this purpose, the damage of mortise joint in practical engineering wassimulated by controlling the gap and width between mortise and tenon. A total of 23 groups of scaled 1:2 OWSMT joint specimens were fabricated and tested subjected to cyclic loadings, and the hysteretic curves of OWSMT joint with different damage degrees were obtained. Through skeleton curves, stiffness degradation curves, and equivalent viscous damping curves of the OWSMT joint, the seismic performance of damaged wood joints was quantitatively analyzed. The results show that, with the increase in the gap between the tenon and the mortise, the slip between them became increasingly obvious, the fullness and peak of the hysteresis curve gradually decreased, the gradient of the skeleton curve also dropped, and both the stiffness degradation curve and the equivalent viscous damping curve are gradually reduced. The research findings shed new light on the seismic assessment of aging timber buildings.     

明代隆昌寺无梁殿的动力特性及抗震性能研究

The brick - vault hall of Longchang Temple at Baohua Mountain is a representative of a series of Ming Dynasty brick - vault halls——a unique architectural heritage type in China. In order to evaluate the structural safety of this architectural heritage in earthquakes, we set up a three - dimensional finite element model to analyze its dynamic properties, seismic response spectrum and seismic time history in order to obtain the natural frequencies, modal modes, seismic effect, and seismic deformation and stress response. The results show that the structure of the hall features high symmetry and high torsional rigidity. The degrees of influence of earthquake on the vibration of the hall are as follows ： roof, side walls and arch on the second floor, eaves of the first floor, side walls and arch on the first floor. Under the Intensity 7 frequently - occurring earthquake, precautionary earthquake, and rarely - occurring earthquake, the most dangerous position of the hall is the junction of the arched window impost and sill wall on the side far away from the stairs on the first floor. In addition, prone to the tensile damage, each arch impost is a weak position in an earthquake. Finally, a seismic strengthening strategy for the brick - vault hall of Longchang Temple is presented based on the results of dynamic properties and seismic behavior analysis. © 2023, Sciences of Conservation and Archaeology. All Rights Reserved.     

社会—生态系统重构背景下农户适应行为及影响机理

随着全球气候变化与可持续性科学发展，适应性研究逐渐成为国际社会关注的热点。农户适应性为可持续生计研究提供了新视角。本文基于社会-生态系统重构背景，从农户视角出发，通过构建农户适应作用分析框架来探讨民勤绿洲地区农户适应行为选择及其影响因素交互效应，厘清农户适应性影响机理。研究结果表明：①以生态治理恢复、农业种植结构调整为主导的政府政策实施重构了乡村社会-生态系统，推动农户生计适应策略变化。②农户生计适应性行为以农业调整为主，被动适应行为选择较少，外出打工成为未来生计趋势。③系统外部影响因素中有效灌溉率（水资源状况）是交互作用的核心因素，左右农户生计适应选择。农户适应行为选择主要受系统内部自然资本、劳动力资本与认知水平、金融资本以及社会关系网络因素影响。④农户资本内部结构与储量的差异是适应行为选择多元化的内在动力，以生态恢复主导的政府计划性适应管理是农户适应行为选择的外在推力。生计资本及系统内外部要素交互作用的综合影响推动农户适应行为发展与变化。     

Seeking politically compatible neighbors? The role of neighborhood partisan composition in residential sorting

High rates of internal migration throughout the United States offer opportunities to examine the factors underlying residential selection and neighborhood choice. We devise a survey experiment where respondents are shown photographs of properties and information about the local socioeconomic environment. By providing and varying additional information about the neighborhood partisan composition, our survey experiment explores how political information affects property evaluation. We find that the same property will be evaluated more favorably by partisans when they learn that it is situated in a predominantly co-partisan neighborhood. A second experiment examines how people make judgments about neighborhood partisan composition in the absence of readily available information. We learn that correct inferences about the politics of a locale can be drawn from non-political information about it, even without exposure to direct information about its partisan balance.     

中国乡村交通出行与地域系统

交通是乡村地域系统形成的重要内容，也是刻画乡村地域系统特征的关键指标。本文采用住建部全国小城镇调查的村镇居民调查数据，从交通出行视角对我国乡村地域系统特征进行识别和分析。结果表明，村-镇-县逐级体系仍占主导地位，村-县联系成为新趋势；农业相关活动仍以村-镇-县等级为主，但其他活动在村-县间联系比例较高，且东部地区及城市近郊更明显；不同目的出行形成20分钟生活圈；随着村民出行范围扩大，传统乡村地域等级体系将发生较大变化。研究结论对乡村空间规划和乡村基础设施布局等具有重要实践价值。     

此心安处是故乡——失范理论视域下城市街头艺人空间行为与治理研究

街头艺术具有触发城市公共空间活力的积极作用，但在城镇化与城市转型交织的特殊背景中，街头艺人群体却被贴上“秩序破坏者”与“底边阶层”的标签，成为公共空间和主流秩序排挤的对象。文章以结构化理论的方法，建构街头艺人“空间-治理规则-治理图景”的解释框架，并以“社会失范理论”的视角，探寻街头艺人空间行为背后的真实目标诉求与既有社会治理规范的冲突。研究认为城市治理手段应当主动适应治理对象的行为规律与目标诉求才能避免失范，街头艺人的行为和社会关系网络具有基于其自身职业特性与理性选择的内在合理性，而既有的刚性、去流动性的稳态治理范式，同街头艺人的真实诉求之间存在不适性。进而提出“适应流动性”的空间治理策略，包括流动性的城市空间、在地化的城市权利等，希冀善待和尊重街头艺人，构建具有艺术活力和开放包容的城市空间。     

基于时空间行为的混合住房社区社会分异的研究框架

混合住房社区内的社会分异是城市社会分异的新形式，是城市地理学者面临的新研究议题，也是在促进社会融合过程中亟待解决的问题。以居住区分异为核心的研究范式平均化了“邻里效应”，无法揭示同一居住区内部的社会分异。居民时空间行为研究为揭示社区内部的社会分异提供了理论和方法支撑。本文首先回顾混合住房社区政策的起源、发展及学术界关于居住混合与社会融合关系的争议，然后对目前国内外关于混合住房社区的研究进行综述，接着讨论了从时空间行为视角透视社会分异问题的有效性，并基于已有研究进展构建了基于居民时空间行为的混合住房社区社会分异的研究框架，以期为混合住房社区政策制定和城市社区管理提供参考。     

基于社交网络的个人.com社区行动者行为空间及其未来

社交网络应用催生了新一代互联网空间重新分配。本文旨在从一些细微迹象中透视个人.com社区行动者行为空间的形成及其组织形式并感知其未来变化趋势。研究认为：社交网络提供的精益性和异步性信息交互引领个人.com社区行动者行为空间形成、更新和融汇，这是一个与现实地理社区相联系并向虚拟社区理性跳跃和空间系统重构的过程；个人.com社区行动者行为空间源于自我呈现并由受众“第二度可见”所决定，它是由若干特殊空间形式组织起来的；社交网络赋予草民行动者个人权力从而使其成为未来行为空间再塑造的决定性力量。基此提出社交网络背景下个人.com社区行动者行为空间存续的三个基本观点：信息方式转变、生活需求新维度产生和网络价值等效兑现。     

Dark tourism and moral disengagement in liminal spaces

Abstract

Dark tourism, which deploys taboo subjects and commercially exploits the macabre, has always raised moral conflicts at a collective and individual level while providing new spaces in which morality is communicated, reconfigured and revitalized. Although earlier studies in dark tourism have focused upon the collective notions of morality with a considerable amount of discussion on the comprehension and the manner in which the history and information of dark tourist attractions are presented for tourist consumption, the individual differences of tourist morality and how tourists morally engage with death and its various forms of representation, has been neglected. In order to understand morally transgressive behavior displayed by tourists at emotionally sensitive or controversial sites and the various ways they justify their actions, the narratives of international tourists who are interested in death-related rituals at a cremation ground in India were collected and analyzed. Drawing upon a socio-cognitive theory, the moral mechanisms involved in tourist judgment towards photography of death-related rituals are discussed. It was observed that the cremation ground offers a liminal space for tourists to exercise their moral agency in an inhibitive form, as well as proactive form and that transgressive behavior among tourists is likely if they disengage from processes related to moral conduct using various moral disengagement mechanisms. This behavior arises due to an obscuring and fragmentation of human agency during moral disengagement thereby making it possible for tourists to not take ownership of the consequences of their actions.