Experimental Study on Seismic Performance of Through-Tenon Joints with Looseness in Ancient Timber Structures

ABSTRACT

In order to study the influence of looseness on seismic performance of through-tenon joints, six through-tenon joints specimens in 1:3.2 scale, including one tight-fitted joint and five loose joints, were fabricated according to the Engineering Fabrication Methods of Qing dynasty. The failure modes, mechanical behaviors such as the hysteresis and envelope curves, strength and stiffness degradations, energy dissipation, and deformation of the specimens under low cyclic reversed loading tests were analyzed. Results show that the failure modes of theses joints under positive and negative loadings are bending damage on the big tenon head and tearing damage on the variable cross-section, respectively. The hysteresis curves of joints appear to be anti-Z shape and present typical pinching effect. The greater the degree of looseness is, the more obvious the slippage is. The bending moment, stiffness and energy dissipation of loose joints are lower than those of the tight-fitted joint under the same rotation angle, and the increase in the loose degree cause them to gradually decrease. Meanwhile, the behavior of the through-tenon joints is further simulated by the nonlinear finite element analysis program, and the test results agree well with the numerical analysis results.     

汉简与《诗经》传本

本世纪以来,随着学术界思想理论方面的解放和西方理论的引进,<诗经>作为经学的研究格局,已经被彻底打破了.人们抛弃了所谓的圣人制作、圣人删削的神话,蒙在<诗经>之上的层层尘垢被全面廓清.     

Physics-based Simulation and High-fidelity Visualization of Fire Following Earthquake Considering Building Seismic Damage

This work proposes a framework for the physics-based simulation and high-fidelity visualization of fire following earthquake (FFE) considering building seismic damage. The seismic damage of regional buildings is simulated using multiple degree-of-freedom building models in conjunction with nonlinear time-history analysis. In parallel, a high-fidelity visualization is presented to simulate fire spread and smoke effects. A case study of downtown Taiyuan with 44,152 buildings is performed. The results show that the influence of different ground motions and building seismic resistances on fire ignition and fire spread can be taken into account and that the FFE scene can be displayed realistically.     

早期贵州籍黄埔学生考释

黄埔军校的诞生,是第一次国共合作时期的重大历史事件.它对国共两党的历史进程和命运都产生了深远的影响.军校刚一创建,贵州就输送了一批高素质的学生.这批学生大多数在外求学,因中国共产党员的举荐,怀抱着信仰主义,改造社会与国家的理想而来.也有少数来自国民党一大代表和其他军事将领以及国民党员安健的介绍.自第一期学生之后,贵州又继续源源不断地为军校输送学生.在一到五期的黄埔毕业学生中,贵州籍的学生人数是163名.其中,第五期人数最多,这与安健的努力密不可分.这批早期的贵州籍学生在黄埔军校很快成长起来,在国民革命、抗日战争中作出了重要贡献,部分人还在战火中成长为国共方面的高级将领.     

“九夏”考述

“九夏”是阔代九大乐歌之统称。“九夏”的演奏，主要使用钟、鼓、鳟、磬等打击乐器，因而具有较强的节奏感，故在周代的礼仪活动中，多用于控制行礼者的行步之节。《肆夏》是“九夏”中的重要一篇，其演奏场合及演奏对象十分复杂，主要功能是在各种礼仪活动中用于控制行礼者的出、入之行节。同时，它还可以献享给宾客，并具有调和礼仪气氛的作用。《陔夏》之“陔”，为警戒之义。《陔夏》的演奏，主要用于宴饮活动结束时控制宾客的行步之节，防止宾客因酒醉而失礼。     

中国现代方志学发展阶段探论(上)

中国现代方志学在中华人民共和国建立以来的发展过程中,经历了兴衰荣盛的变化。科学地划分其所经历的各个发展阶段乃至阶段中的发展时期,并对其间的发展状况予以归结,不仅有裨中国现代方志学的深入研究,进而促进中国方志学整体研究的深入,而且有裨新一轮方志的编修工作,并促进完整的、科学的方志学理论体系和中国方志学学科体系的构建。本文认为,中国现代方志学的发展经历了孕育待兴、探索、中挫冷落和新兴发展4个阶段,而新兴发展阶段又可分为复苏新生、全面兴起、繁荣兴盛和深入发展4个时期。对各个发展阶段及时期的起迄时间、发展状况、相关特点、成果得失等进行了探论。     

李汝珍年谱

<镜花缘>的作者李汝珍,字松石,直隶大兴(今属北京市)人,长期定居海州之板浦(今属江苏省连云港市).其生平史料极为匮乏,给研究其作品带来莫大困难.笔者不揣愚陋,拟在前人已做工作基础上,就有关现有资料草成一简谱,谨以就正于识者.乾隆二十八年(1763),大约生于此年.     

探幽索颐 锲而不舍：王宇信先生访谈录

徐义华（以下简称徐）：王先生您好!甲骨学虽然经过一百多年的发展，终于成为当今世界的“显学”，但客观地讲，甲骨学依然是一个比较偏僻的学科，甚至对于许多人而言，是带有神秘色彩的学科。我们想知道您人生的初衷是什么？为什么最终选择了甲骨学？     

“文华堂题”款画跋及晋府钤印

本文考证了二幅画卷上署款“文华堂题”之二跋非明太祖朱元璋之书,乃其皇太子朱标之手笔。又考晋府收藏之作品上的钤印特点,以辨真伪。