基于应变监测的连续梁支承差异沉降识别  

Differential settlement identification of pier for continuous beam based on strain monitoring

作　　者：王少杰[1,2] 徐赵东 李舒[1] 王凯洋[1] Dyke Shirley J 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]普渡大学土木工程学院,美国西拉斐特47907 [3]南京东瑞减震控制科技有限公司,南京210033

出　　处：《吉林大学学报（工学版）》2016年第4期1090-1096,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：江苏省杰出青年基金项目(BK20140025);江苏省自然科学基金项目(BK20151092);科技部中青年科技创新领军人才项目;江苏省普通高校研究生科研创新计划项目(CXLX13_102;CXZZ12_0108);中央高校基本科研业务费专项资金项目(3205004907)

摘　　要：首先,运用基本力学原理,以三跨相等连续梁为对象,推导了梁体应变改变量与支承差异沉降量之间的解析式;并以某刚性轻轨桥为例,证明了微小支承差异沉降导致的应变改变量是可测的。其次,通过三跨不等连续梁模型试验,采用顶升方法模拟差异沉降,深入分析了梁底应变改变量与顶升量之间的关系,同时验证了FBG新型传感器的优越性能。再次,推导了与试验模型对应的梁底应变改变量与桥墩差异沉降之间的关系式,对两种模式(边墩顶升、中墩顶升)在不同差异沉降下的理论解与试验测试结果进行比较分析,结果表明二者吻合程度较高。最后,对识别基本流程与策略作了简要叙述。Based on measured strain data,a method of differential settlement identification of piers for continuous beam is proposed using theoretical and experimental analysis.First,the analytical formula with respect to the Variation of Strain Value（VSV）of the beam and the differential settlement identification of piers is derived by employing a three-equal-span continuous beam for instance.Also it is proved that the VSV result from minor differential settlement of piers is measureable in the case of a certain rigid light railway bridge.Second,the relationship between the VSV obtained from the bottom of the beam and the upright rectification value is analyzed using a three-unequal-span continuous beam for verification,where the settlement is simulated using the upright rectification method.Meanwhile,the performance of the new type Fiber Bragg Grating（FBG）sensors is demonstrated as well.Third,for the experimental model,theexpression of the relationship between the VSV on the bottom of the beam and the differential settlement of the piers is derived,which reflects a well consistency between theoretical and experimental results in both cases（differential settlement of side pier and mid pier）under the condition of various degrees of differential settlement.Finally,the identification procedure and strategy are briefly clarified.

关 键 词：结构工程 应变 差异沉降 连续梁 模型试验 

分 类 号：TU997[建筑科学—市政工程] TU375