波形钢板-混凝土组合墙浇筑过程受力特性研究

Study on the Mechanical Characteristics of Concrete-infilled Double Steel Corrugated-plate Walls During Concrete-pouring Process

采用试验实测、有限元分析与理论计算的方法,研究高度为12. 73,10. 87m的超高波形钢板-混凝土组合墙,在混凝土浇筑阶段钢板承受的侧压力。通过比较试验数据和计算结果发现,自密实混凝土对模板的侧压力只在浇筑初期的很短时间段内较大,初凝后侧压力迅速降低到较小水平。波形钢板的对拉螺栓受力随高度增加以指数形式降低,表示模板底部所受侧压力随高度变化以指数形式降低。设计模板和对拉螺栓时,可按公式F=γcH计算最大侧压力。

In this paper,the outward lateral pressures on steel plates in the concrete-pouring stage of ultra-high concrete-infilled double steel corrugated-plate walls( CDSCWs) with heights of up to 12. 73,10. 87 m are studied by means of experimental measurement. The tensile forces of high strength bolts connecting the double steel corrugated-plates together are also observed. Accordingly finite element analysis and theoretical calculation for the measured CDSCW specimens are conducted. By comparing the experimental data and the calculation results,it is found that the lateral pressures on steel corrugatedplates and the tensile forces of bolts are caused by the self-weight of the self-compacting concrete( SCC),which are only relatively large in a short period in the initial stage of concrete pouring,and the lateral pressures and the bolts’ tensile forces rapidly reduced to a constant small value after the initial pouring stage. The tensile forces of bolts decreased exponentially with the increase of the height,it indicating that the lateral pressures on the bottom of the corrugated-plates is also decreased exponentially with the increasing height of the walls. In the strength design of the CDSCWs and the bolts,the maximum lateral pressures can be calculated according to the formula F = γcH provided by the national code.