聚合物改性混凝土加固空心板桥荷载横向分布理论及试验研究

Theoretical and Experimental Study of Load Transverse Distribution of Hollow Slab Bridge Strengthened by Modified Polymer Concrete

为了解采用粘贴聚合物改性混凝土(MPC)加固空心板桥的效果,及加固后空心板桥荷载横向分布情况,以横向由4片空心板梁组成的空心板桥为研究背景,对加固后空心板桥的横向分布计算方法进行研究,并结合实桥加固后荷载试验结果进行对比分析。研究结果表明:采用MPC加固后的空心板桥荷载横向分布影响线较加固前平缓,桥梁横向整体受力性能显著提高;采用MPC加固后的主梁结构可以传递弯矩,传统的铰接板梁法已不能满足此种加固方法的横向分布计算,提出的修正刚接板梁法及修正G-M法可用于加固后该类型桥梁横向分布计算。

To understand the effect of strengthening the hollow slab bridge by bonding the modified polymer concrete （MPC） and the load transverse distribution of the strengthened bridge, a hollow slab bridge composed of 4 hollow slab beams in the transverse direction was taken as an object for study. The calculation methods for the load transverse distribution of the strengthened bridge were studied and with reference to the load test results of the actual bridge, the calculation methods were compared and analyzed. The results of the study demonstrate that the influence lines of the load transverse distribution of the hollow slab bridge strengthened by the MPC are gentler than those of the bridge not strengthened by the MPC, the global force per- formance of the bridge in the transverse direction has been significantly improved and the main beam structure strengthened by the MPC can transfer bending moment. The conventional hinged ly-jointed slab beam method can not satisfy the calculation of the load transverse distribution of the bridge strengthened by the MPC while the modified rigidly-jointed slab beam method and the modified G-M method as proposed in this paper are applicable to the calculation of the load trans- verse distribution of such type of the strengthened bridge.