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预制薄板(预制预应力混凝土带肋薄板)施工阶段的受力性能与肋上孔洞分布及肋端缺口尺寸相关。为便于工业化生产及现场拼装,对预制薄板进行了规格设计。以肋上孔洞分布及肋端缺口尺寸为研究的影响因素,理论给出考虑肋上孔洞分布及肋端缺口尺寸的预制薄板弯曲挠度通用公式,结合工程实际,推导了预应力、均布荷载作用下两端简支预制薄板的等效刚度公式,便于编制计算机程序进行计算。借助MATLAB7.0,对比分析了5种肋上孔洞分布形式预制薄板的跨中预应力反拱度、自重余拱以及施工阶段的挠度,结果表明:肋上孔洞分布对预制薄板的跨中挠度影响明显,且随板件长度增大逐渐减小。对于采用110mm×25mm孔洞的预制薄板,建议预应力反拱度取无孔模型与通孔模型计算挠度的平均值,自重余拱、施工阶段的跨中挠度按通孔模型计算。
The mechanical properties of prefabricated sheets (prefabricated prestressed concrete with ribbed sheet) during the construction phase are related to the distribution of the holes on the rib and the size of the notched ends of the ribs. In order to facilitate the industrial production and assembly on site, the prefabricated sheet has been designed. Taking the distribution of holes on the rib and the size of the notch on the ribbed end as the researching factors, a general formula of the bending deflection of the prefabricated sheet considering the distribution of the hole on the rib and the notch size of the ribbed end is given in theory. According to the engineering practice, the prestressing and uniform loading effects The equivalent stiffness formulas of the simply supported and prefabricated plates at the two ends are easy to calculate and compose the computer program. By means of MATLAB7.0, the contrast of the prestressing force of over-center prestressed arch, self-supporting residual arch and the construction stage of five types of prefabricated ribbed holes are analyzed and compared. The results show that the influence of the hole distribution on the prefabricated mid-span deflection Obviously, and decreases gradually with the length of the plate. For prefabricated slabs with 110mm × 25mm holes, it is recommended to calculate the average deflection of the prestressed back arches from the non-hole model and the through-hole model. The residual arch is self-contained and the mid-span deflection during the construction phase is calculated by the through hole model.