林业工程学报2016，Vol.1Issue(6)：137-141,5.DOI:10.13360/j.issn.2096-1359.2016.06.023
南京小龙湾自锚式悬索桥荷载试验
Load tests of Nanjing Xiaolongwan self-anchored suspension bridge
摘要
Abstract
There are great differences in mechanic properties between self⁃anchored and earth⁃anchored suspension bridge. The stress condition of self⁃anchored suspension bridge is more complex, however, the mechanism of which is still unclear at present. The load test is the most direct and effective way to evaluate the performance and operation status of the bridge. However, the load test of self⁃anchored suspension bridge is less studied. Nanjing Xiaolongwan bridge is a self⁃anchored concrete suspension bridge with two⁃tower, two⁃main cable plane. The span layout of bridge is ( 44+96+44) m, and there are 33 couples of vertical hangers, including 19 ones on the main span and 7 ones on each side span. To ensure the normal use of Nanjing Xiaolongwan self⁃anchored suspension bridge, a load test was conducted for evalua⁃ting actual carrying capacity and mechanical behavior in serviceable state. Deformation of stiffening girder, longitudinal displacement of bridge tower top, force increment of hanger and main cable, section stress of stiffening girder and bridge tower were tested under static load conditions while dynamic characteristic and its response were tested under live load ones. Results of static load test indicated that the theoretical values generally matched with the values of static load test. Testing coefficients were lower than 1�0, which was between 0�80 and 1�00. The mechanical characteristics of actual bridge can be reflected well by the theoretical analysis model, and the small residual deformation after load static test and the elastic stress state under the live load indicated the Nanjing Xiaolongwan self⁃anchored suspension bridge had e⁃nough stiffness and strength to conform to the requirements of design loading grade. The results of live load test indicated that Nanjing Xiaolongwan self⁃anchored suspension bridge had good dynamic characteristics. The impact factors were small and not more than 0�03 while the vehicles were normal driving. However, the impact factors were increased sharply to 0�29-0�41 when the vehicles were very fast and the bridge deck was defective. The bridge deck roughness affected significantly the vehicle impact effects. The maintenance of bridge will be strengthened to ensure that the bridge deck is smooth, reducing vehicle impact effects.关键词
自锚式悬索桥/静载试验/动载试验/承载能力Key words
self-anchored suspension bridge/static load test/live load test/carrying capacity分类
交通工程引用本文复制引用
端茂军,李国芬,李建慧,索小灿..南京小龙湾自锚式悬索桥荷载试验[J].林业工程学报,2016,1(6):137-141,5.基金项目
教育部高等学校博士学科点专项科研基金项目（20133204120015）；江苏省高校自然科学研究项目（12KJB560003）；江苏高校优势学科建设工程资助项目（ PAPD）；江苏高校品牌专业建设工程项目（ PPZY2015A063）。 （）
