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前言为了探索钢筋砼屋架次应力对承载能力的影响,我们于1976年6月至11月结合实际工程,对三个屋架进行了测试。其中屋架I为跨度18m的折线形普通钢筋砼屋架,屋架Ⅱ及Ⅲ为跨度18m及27m的多边形及折线形予应力钢筋砼屋架。屋架Ⅰ及Ⅱ的试验均在试验室内进行,用千斤顶加荷;屋架Ⅲ在工地进行,用吊篮加荷。屋架形式、主要尺寸及影响次应力的一些主要特征见图1及表一.
Foreword In order to explore the influence of the secondary stress of the reinforced concrete truss on the bearing capacity, we tested the three trusses in combination with the actual project from June to November 1976. Among them, the roof truss I is a broken line-shaped ordinary reinforced concrete truss with a span of 18m, and the trusses II and III are polygons with a span of 18m and 27m, and a polygonal prestressed reinforced concrete roof truss. The tests of the roof trusses I and II were carried out in the test room and were loaded with jacks; the truss III was carried on the construction site and loaded with a basket. The main features of the truss form, main dimensions and secondary stress are shown in Figure 1 and Table 1.