基于薄板理论的混凝土桥梁近场抗爆方法研究

Method of Close Blast Response Analysis for Concrete Bridges Based on Shear-flexural Plate Theory

以近场爆炸条件下的混凝土桥梁为研究对象,结合现有公路桥梁多采用梁板式混凝土,其桥面板具有高宽比和高跨比都比较小的特点,将桥面板做整体薄板考虑,基于动力薄板理论提出具体的动态控制方程,开展爆炸荷载作用下混凝土梁板式桥梁动力特性研究,并通过理论分析结果与实测数据的对比分析,验证了基于薄板理论开展常规梁板式混凝土桥梁抗爆性能研究的有效性与可行性.同时提出合理控制比例距离是实现桥梁结构抗爆设计的有效途径.

In this paper the research focuses on close blast loadings.And the analytical method of analyzing the dynamic response of a bridge deck subjected to the blast loadings is presented with the deck be treated as a shear-flexural plate based on the deformation observations and analyses,since beam/slab structures are widely applied for highway bridges with low values for both depth to width ratio and depth to span ratio.Then the governing equation is derived,and the method of the blast response analysis is proposed.For a real bridge project,the numerical results,including dynamic characteristics and structural response are given to verify and validate the proposed shear-flexural plate model.The obtained data have also indicated that scaled distance is one of the key parameters for blast resistant design for structures and should be chosen appropriately.