地震作用下公路桥梁碰撞的半主动控制研究

针对地震作用下公路桥梁的碰撞问题,采用接触单元法模拟桥梁之间的碰撞作用,并在此基础上研究了采用磁流变阻尼器的公路桥梁碰撞的半主动控制方法。通过对某公路桥梁的数值模拟发现,地震作用下桥梁之间的相互碰撞,将大幅增加桥梁的绝对加速度响应。采用磁流变阻尼器的半主动控制系统能够较好地降低结构的地震响应和消除地震作用下的碰撞。     

静载试验在既有桥梁鉴定中的应用

通过四种工况情况下的桥梁静载荷试验,测定了桥梁应变、挠度值,对既有桥梁的结构强度、刚度进行了分析,对桥梁的承载能力做了鉴定.     

粤北之氟石矿

氟石矿在粤北发见者有两处:一为南雄县东廿公里之江头圩,适在南雄盆地之边缘,交通尚称利便,一为乐昌九峰之斜坑,地处山区,峰峦耸立,道路崎岖,交通至为不便。     

STRATIGRAPHY AND PAL?EONTOLOGY OF THE SINIAN ROCKS OF NANKOU

INTRODUCTION The Sinian rocks in China as far as we know are most well developedin Chihli and Shansi provinces. In Chihli, they are usually restricted to theupper part, as in Ta Yang, Pei Yu, Hsia Ma Ling, Ching Pei Kou and other     

ON THE CENOZOIC GEOLOGY BETWEEN LOYANG AND SIAN

Bordered by the Chungtiaoshan (中條山) on the North and the Tsinling (秦嶺) on the South, the area between Loyang and Sian, where the Huangho River hits and follows the old Weiho valley has been known for a long time to be specially rich in Cenozoic formations     

ON THE STRATIGRAPHY OF THE FENGNINIAN SYSTEM

The corals described by Mr. Yü in the preceding paper came mainly from southern Kueichou, in the districts of Tushan (獨山) and Tat'ang (大塘). The first fossiliferous section met with in the field (Pl. Ⅰ, Section ra) is that between the village of Kolaoho ((?)狫河). Ⅱ kilometers south of the city     

DEEP WELLS IN THE PEKING AREA

The underground water-supply of the plain of North Chihli is of sufficient importance to geologists and civil engineers to warrant the placing in readily available form of some data till now not easily accessible.     

公路桥梁加固施工技术规范

交通运输类,中交第一公路勘察设计院编著,大16开,140千字,96页,平装,估价:30元,2008年10月出版,ISBN:978-7-114-07378-6本书为交通运输部发布的行业标准,其内容基本涵盖了我国公路桥梁加固施工的各种技术、工艺及施工要求,对提高     

历史划拨土地如何登记发证

案例 2011年10月,A县电业局向当地土地行政主管部门提交1994年A县人民政府划拨供地批文及其他相关资料,就其办公用地提出划拨用地登记发证申请。对此类历史遗留划拨用地如何发证？A县国土资源局意见分歧。