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本文论述了部分预应力砼梁的裂缝开展和闭合性能。根据9根矩形和3根T形截面部分预应力砼梁的试验结果,提出了用名义拉应力方法计算裂缝闭合弯矩及多次抓环荷载下裂缝开展宽度的建议公式。文中列举工程实例说明设计中利用裂缝闭合性能的经济性和合理性。
This article discusses crack development and closure performance of partially prestressed trusses. Based on the test results of 9 rectangular and 3 T-section partial prestressed truss beams, a formula is proposed for calculating the crack closing moment and the width of crack propagation under multiple grab ring loads using the nominal tensile stress method. The examples cited in the article illustrate the economics and rationality of using crack closure performance in design.