（内蒙古科技大学土木工程学院， 包头 014010）

［摘要］目前叠合双向板在拼缝处的构造措施存在传力不理想、施工不便等不足，而L形拼缝叠合双向板从设计原理上分析具有传力理想、施工方便的优点。基于此，对L形拼缝叠合双向板、附加钢筋式叠合双向板和现浇双向板进行了静力加载试验。分析试验板的挠度、钢筋应变、裂缝开展随荷载的变化以及L形拼缝叠合双向板拼缝处的传力情况。试验结果表明：L形拼缝叠合双向板和现浇双向板的裂缝开展以及最终破坏形态相似，其受力性能可以认为“等同现浇”；L形拼缝叠合双向板的开裂荷载和极限荷载高于附加钢筋式叠合双向板，受力性能优于附加钢筋式叠合双向板。

［关键词］L形拼缝； 叠合双向板； 静力加载试验； 受力性能

中图分类号：TU317文献标识码：A文章编号：1002-848X(2020)02-0067-05

Experimental study of mechanical properties of L-shaped joint laminated two-way slabs

Li Juan， Ni Dongyang， Liu Xiang， Zhang Junrui

（Inner Mongolia University of Science and Technology， Baotou 014010， China）

Abstract:At present, the structural measures of laminated two-way slab at the joint are not ideal in force transmission and inconvenient in construction, while the L-shaped laminated joint two-way slab has the advantages of ideal force transmission and convenient in construction according to the design principle. Based on this, the static loading tests of L-shaped joint laminated two-way slab, additional reinforced laminated two-way slab and cast-in-place two-way slab were carried out. The deflection, reinforcement strain and crack development of the test slab with the change of load were analyzed, as well as the force transmission at the joint of L-shaped joint laminated two-way slab. The experimental results show that the crack development and ultimate failure mode of L-shaped joint laminated two-way slab and cast-in-place two-way slab are similar, and its mechanical performance can be considered as "equivalent to cast-in-place"; the cracking load and ultimate load of L-shaped joint laminated two-way slab are higher than that of additional reinforced laminated two-way slab, and its mechanical performance is better than that of additional reinforced laminated two-way slab.

Keywords:L-shaped joint; laminated two-way slab; static loading test; mechanical property

*国家自然科学基金项目（51368042）。

作者简介：李娟，硕士，讲师，Email：nidongyang123@126.com。