（1 山东建筑大学土木工程学院， 济南 250101；  2 山东建筑大学工程鉴定加固研究院， 济南 250013； 3 同圆设计集团有限公司， 济南 250101； 4 山东万斯达建筑科技股份有限公司， 济南 250014）

［摘要］预应力混凝土钢管桁架叠合板是近几年出现的一种新型叠合板，叠合板在施工阶段的受力性能非常重要。设计了4个预应力混凝土钢管桁架叠合板试件，并对其进行受弯载荷试验。给出了4个试件的荷载-跨中挠度曲线。同时考虑钢管对混凝土的约束，按照等效截面刚度法推导出了施工阶段的短期刚度计算公式，计算了简支板的跨中挠度。在构件抗弯刚度未发生严重退化时，跨中挠度的计算结果与试验结果较为吻合。

［关键词］预应力混凝土叠合板； 灌浆钢管桁架； 短期刚度

中图分类号：TU378， TU398-9文献标识码：A文章编号：1002-848X(2020)06-0021-04

Study on short-term stiffness of prestressed concrete composite slab with grouted steel pipe trusses during construction

Zhou Guangqiang1,2, Zhang Xin1,2, Wang Shun3, Zhang Bo4, Zhang Shuhui4

(1 School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China;2 Engineering Research Institute of Appraisal and Strengthening, Shandong Jianzhu University, Jinan 250013, China; 3 Tongyuan Design Group Company, [JZ]Jinan 250101, China; 4 Shandong One Star Construction Technology Company, Jinan 250014, China)

Abstract:Prestressed concrete composite slab with grouted steel pipe trusses is a new type of composite slab in recent years, and the mechanical properties of composite slabs are very important during construction. Four specimens of the new composite slab were designed and tested, and the bending load test was carried out to obtain the load versus mid-span deflection curves. According to the equivalent section stiffness method and considering the constraint of steel pipe on concrete, the calculation formulas of the short-term stiffness during construction were derived, and the mid-span deflections of the simply-supported slabs were calculated. When the flexural rigidity of the specimens did not degenerate seriously, the calculated deflections agreed well with the test results.

Keywords:prestressed concrete composite slab; grouted steel pipe truss; short-term stiffness

*土木结构防灾减灾协同创新中心开放课题（XTP201904）。

作者简介：周广强，硕士，副教授，一级注册结构工程师，Email:zhougq@sdjzu.edu.cn。