Shenyang North South Expressway Viaduct receives 12 heavyweight examiners-baxia

Shenyang North South Expressway Viaduct ushered in the 12 heavyweight "Examiner" in September 21st, unity Road North and south of the Shenyang Expressway Viaduct to Wanghua overpass section welcomed a group of special examiner, large trucks 35 tons per vehicle weighing, a total of 12, according to the specific sequence of loading on the bridge, the viaduct are static and dynamic load test, and the establishment of electronic files of the bridge. At the test site, 12 trucks loaded with earth and stone and other heavy loads were transported to the bridge in batches and parked in the specified part of the bridge as required. When the heavy load vehicle is on the bridge, the vibration sense of the bridge is obvious. The upper structure of viaduct adopts two structural forms of prestressed concrete continuous box girder and steel box girder. The static and dynamic load tests of the bridge are carried out respectively to check whether the force state of the bridge structure meets the design expectation under the actual working condition, which is the most direct and effective way to test the bridge performance and working state. Shenyang Municipal Construction Committee project office responsible person, static load test will continue for more than 3 hours. According to reports, tests were arranged 24 strain sensors and 14 displacement sensors, these sensors like "Stethoscope", "beat of each bridge in the truck when driving the meridian point" real-time monitoring, direct observation of the key parts of the bridge all the stress and deformation state. After the static load test, the bridge has been tested dynamically. The dynamic test mainly tests the structural dynamic parameters such as the natural frequency and impact coefficient of the bridge, mainly including the pulsating test and the barrier free driving test. In the fluctuation test deck without any nearby traffic load and bridge site irregular source under the condition of high sensitivity through dynamic testing system for the determination of wind load at the bridge site, flow pulsation, random excitation caused by micro vibration of a bridge structure response, natural frequency measured structure. The barrier free driving test, heavy vehicles will pass through the bridge at different speeds, the vibration signal in the vehicle record under the excitation of each measured by the sensor, the test in the structure under the running state of the forced vibration characteristics, comprehensive parameters of bridge structure dynamic characteristics and the interaction of the whole.

沈阳南北快速干道高架桥迎来12位重量级“考官”9月21日,沈阳南北快速干道高架桥团结路至望花立交桥段迎来一群特殊“考官”,每辆重达35吨的大型载重卡车,共计12辆,按照特定的加载顺序依次上桥,对高架桥分别进行静态和动态荷载试验,并建立该桥的电子档案。试验现场,12辆满载土石等重物的载重卡车,分批行驶上桥,按照要求停放在大桥的特定部位。重载车辆上桥时,桥梁振感明显。高架桥上部结构采用了预应力混凝土连续箱梁和钢箱梁两种结构形式。对桥梁分别进行静载和动载试验,以检测在实际工作状态下,桥梁结构的受力状态与设计期望值是否相符,这也是检验桥梁性能及工作状态最直接、最有效的办法。沈阳市建委项目办现场负责人介绍,静态荷载试验将持续3个多小时。据介绍,试验共布置了24个应变传感器和14个位移传感器,这些传感器好比“听诊器”,在载重卡车行驶时对桥梁跳动的每个“经脉点”进行实时监测,直接观测大桥各个关键部位的受力及变形状态。大桥在静态荷载试验结束后,进行了动态试验。动态试验主要测试大桥的自振频率、冲击系数等结构动力参数,主要包含脉动试验和无障碍行车试验。脉动试验是在桥面无任何交通荷载以及桥址附近无规则振源的情况下,通过高灵敏度动力测试系统测定桥址处风荷载、地脉动、水流等随机荷载激振而引起桥跨结构的微幅振动响应,测得结构的自振频率。无障碍行车试验,载重车辆将以不同时速通过桥梁,由传感器记录各测点在车辆激励下的振动信号,测试在行车状态下结构的受迫振动特性,研究桥梁结构的动态特性及整体共同作用的综合参数。相关的主题文章: