钢-混凝土组合桥面板滑移及掀起效应研究

Study on Slip and Uplift of Steel-concrete Composite Slab

为了研究钢-混凝土组合桥面板的混凝土开裂、钢与混凝土界面之间的滑移及掀起效应,设计了采用开孔钢板剪力连接件的钢-混凝土组合桥面板试验构件,并进行了负弯矩作用下的全过程试验研究。引入光纤光栅测试技术,完成了试验构件的滑移、掀起及开裂等的测试;采用有限元方法建立了试验构件的数值仿真模型,并将计算结果与试验结果进行了对比分析。研究结果表明:光纤光栅传感器能较准确地观测到开裂荷载,且与应变片测试结果吻合较好;对于普通应变片难以观测的滑移和掀起效应,光纤光栅传感器均表现出较强的优越性。

In order to study the cracking in concrete,the slip and uplift between the steel girder and concrete slab of steel-concrete composite slab,an experimental specimen with the perfobond leiste（PBL）shear connector was designed.The specimen under the negative moment loading was tested during the whole process.Then,the fiber Bragg grating（FBG）sensing system was introduced to test the crack,slip and uplift until its collapse.Furthermore,a finite element method was used to simulate the performance of the test specimen and the calculation results were compared with the test ones.The results show that the cracking load of the concrete can be tested accurately by the fiber Bragg grating sensing technology,whose results agree well with that from strain gauge.The slip and uplift between the steel girder and the concrete slab are not easy to be caught by the strain gauge,but the fiber Bragg grating sensing technology can get better results under the same test conditions.