Influence of Openings,With and Without Confinement,on Cyclic Response of Infilled R-C Frames — An Experimental Study

This article presents the experimental results of a study on reinforced-concrete frames infilled with masonry with openings. The frames were designed according to current European codes. They were built in a scale 1:2.5 and infilled with masonry walls. Mid-size window and door openings were located centrically and eccentrically and were executed with and without tie-columns around them. Presence of masonry infill, although not accounted for in design, improved the system behavior (increase in stiffness, strength and energy dissipation capacity) at drift levels of up to 1%. During the test, openings did not influence the initial stiffness and strength at low drift levels. Their presence became noticeable at higher drift levels, when they lowered the energy dissipation capacity of the system. The infill wall had a multiple failure mechanism that depended on the opening height and position. Tie-columns controlled the failure type, independent of the opening type, prevented out-of-plane failure of the infill, and increased the system's ductility. Negative effects of the infill on the frame were not observed. The infill's contribution could be deemed positive as it enhanced the overall Structural Performance Level. Analytical expressions commonly used for infilled frames underestimate the infill's contribution to strength and stiffness and overestimate the contribution of the bare frame.     

地缘政治关系简析

本文从地缘政治学分析国际政治大国与全球地理环境之间的关系实质,即地理位置、综合国力和战略利益在地域政治体系中的相互联系、制约和影响,及变化规律.     

肥致碑及相关问题

肥致碑,1991年出土于河南省偃师县(今改市)南蔡庄一座东汉墓内。偃师县文物管理委员会编写的发掘简报见《文物》1992年第9期。简报发表后,备受海峡两岸学者的关注。20年来,公开发表的研究文章不下20多篇。文章内容相对集中在碑文的释读、肥致碑的性质、碑文记述与墓内被葬者的问题、碑文反映的东汉社会风气和碑文的书法艺术等五个方面。后面两个问题,研究者的看法基本一致,兹不赘述。前三个问题,看法     

渭南市博物馆藏金代“总领军马都提控印”考释

渭南市博物馆收藏一方20世纪80年代出土于陕西省渭南市大荔县的金代官印,此方官印除印文外,背面和两侧阴刻铸印机构、铸印时间等款识。此印作为特殊的文献资料,真实记录了金代后期招募义军的历史,同时也侧面反映了金代官制、官印的变迁,蕴含了丰富的历史信息。本文借鉴前人的研究成果,结合《金史》的相关记载,从官职、铸印机构、品阶三个方面对该印进行考释。