弹性地基上混凝土板动力响应试验及数值分析  

Experimental and numerical analysis on dynamic response of concrete slab on elastic foundation

作　　者：王志亮[1,2] 阳栋[2] 

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]同济大学土木工程学院,上海200092

出　　处：《哈尔滨工业大学学报》2016年第9期125-131,共7页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51379147;51579062;51174145);教育部博士点专项资金(20120072110024)

摘　　要：为探讨弹性地基上混凝土板的动力响应,开展室内模型试验和数值模拟分析.在模型箱内填实土体,上置预制混凝土板,采用橡胶头的力锤作为加载设备,研究混凝土板的运动过程、脱空状况以及弯沉盆形状等,并辅以数值验证.结果表明:板角加载时位移幅值最大,板中加载时位移幅值最小;不脱空情况下,在板对称轴一端加载时,加载点向下位移最大,对称轴另一侧向上位移最大;在小变形和接触良好前提下,功的互等定理完全适用;在板边中点敲击,弯沉盆边界在板中附近,而在板角敲击时弯沉盆边界靠近板对角线;脱空区附近的位移等值线密度增加、曲率变大.可根据弯沉盆形状或相关点处位移值判别板的脱空状况,以及通过数值结果拟合试验数据法来确定地基的弹性模量.In order to explore the dynamic response of concrete slab on elastic foundation, laboratory experiment and numerical analysis are carried out. After the tested soil is filled in model box and the precast concrete slab placed above, the motion process, the void status and the shape of deflection basin are studied by using the hammer with a rubber head as the loading facility. The results show that the downward displacements of loading point reach the maximum and minimum values respectively when hitting at the corner and the center of the slab. In the case of no void, the downward displacement of hitting point is the largest, while the maximum upward displacement can be observed at the other end of the symmetry axis when hitting at one end of slab symmetry axis. The reciprocal theorem of work is completely satisfied under the conditions of small deformation and perfect contact between slab and foundation. The boundary of deflection basin is near the middle of slab when knocking at the center of slab edge, while it is in the vicinity of the diagonal when hitting at slab comer. The displacement contours near the void region get dense and their curvatures accordingly become large. The void phenomenon of the slab can be identified according to the shape of deflection basin or the displacement of related point, and the elastic modulus of foundation can be determined via fitting the numerical results with the experimental data.

关 键 词：弹性地基 混凝土板 动力响应 弯沉盆 脱空现象 

分 类 号：U416.216[交通运输工程—道路与铁道工程]