钢筋桁架楼承板纤维水泥板底模及连接件承载力试验研究

Experimental Research on Bearing Capacity of Fiber Cement Board Bottom Formworks and Fastenters of Steel Bars Truss Decks

纤维水泥板作为底模的钢筋桁架楼承板是一种新型钢筋桁架板,为保证水泥纤维板底模钢筋桁架楼承板的施工安全,同时为修订CECS 273︰2010《组合楼板设计与施工规范》提供依据,对纤维水泥板底模钢筋桁架楼承板36个长试件和36个短试件进行了承载力试验研究。结果表明:底模侧向边缘在集中线荷载作用下会出现螺钉钉帽拉出破坏、底模边缘破坏以及连接件破坏。在对试验现象和数据分析的基础上提出了钉帽拉出破坏、底模边缘破坏的理论计算式和实用计算式,并给出了连接件承载力标准试验方法,理论计算式与试验结果吻合较好,实用计算式则偏于安全。

Fiber cement board as the bottom formwork of steel truss deck is a new type of steel bars truss deck.In order to ensure the construction safety of steel bars truss deck with cement fiber board bottom formworks and provide a basis for revising the Code for Design and Construction of Composite Slabs(CECS 273︰2010),the bearing capacity of 36 long specimens and 36 short specimens of the steel bars truss decks with fiber cement board bottom formworks was tested.The results showed that the nail cap pulling failure,bottom formwork edge failure,and fastener failure would occur at the lateral edges of bottom formworks under the action of concentrated line load.Based on the analysis of experimental phenomena and data,the paper proposed theoretical and practical calculation formulas for nail cap pull-out failure and bottom formwork edge failure,and also provided standard test methods for the bearing capacity of connectors.The theoretical calculation formula given in the paper agreed well with the test results,while the results obtained by practical formula were conservative.