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通过4块单块板和4块拼缝板试验,研完了预应力空心板在中置集中荷载作用下的抗剪性能,研究结果表明:预应力空心板的破坏型志主要有4种:(1)冲陷破坏;(2)剪切冲陷破坏;(3)冲弯破坏;(4)纵裂——横弯破坏。影响破坏生态的主要因素是空心板的剪跨比λ。此外还提出了抗剪强度的计算公式,采用该公式的计算结果与试验结果吻合较好,并可与非预应力空心板抗剪强度计算公式相衔接。本研究成果可供修订规范及工程设计参考。
The shear strength of the prestressed hollow slab subjected to the neutral load was studied through four monolithic slabs and four patch panels. The results of the study showed that there are four main types of failure characteristics of prestressed hollow slabs: 1) Collapse damage; (2) shear failure; (3) bending damage; (4) longitudinal cracking - transverse bending damage. The main factor influencing the ecological destruction is the shear span ratio λ of the hollow slab. In addition, the calculation formula of shear strength is also proposed. The calculation result of this formula is in good agreement with the test results, and it can be connected with the calculation formula of shear strength of non-prestressed hollow slabs. The results of this study can be used to revise the normative and engineering design references.