共查询到16条相似文献,搜索用时 250 毫秒
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本文通过工程实例分析了大跨度预应力次梁结构体系在工程应用中需注意的几个问题,指出应重视预应力等效荷载在超静定结构中对相关约束构件产生的次弯矩和次扭矩,并加强施工阶段的验算。 相似文献
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本文提出了后张预应力在砼结构中产生的当量荷载的计算方法。推导了等代预应力对结构作用的等效荷载和当量荷载,揭示了等效荷载与当量荷载的区别与联系。对于沿连续布置预应力筋范围内构件截面有变化的结构,用当量荷载等代预应力效应,计算方法简捷,计算结果正确。 相似文献
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本文提出了后张预应力在混凝土结构中产生的当量荷载的计算方法。推导了等代预应力对结构作用的等效荷载和当量荷载,揭示了等效荷载与当量荷载的区别与联系。对于沿连续布置预应力筋范围内构件截面有变化的结构,用当量荷载等代预应力效应,计算方法简捷,计算结果正确。 相似文献
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部分预应力混凝土超静定结构的设计方法 总被引:1,自引:0,他引:1
本文提出了部分预应力混凝土超静定结构的一种新的设计方法──单位次弯矩法。该法以结构中所有部分预应力混凝土构件同时满足两类极限状态为设计原则。另外,基于有效利用次内力的思想,对预应力筋的配置以及利用非吻合束等问题提出了可供实践应用的设计建议。附有设计实例。 相似文献
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同济大学图书馆扩建工程要求在主楼标高16.05m处及以上向外悬挑外包尺寸为25m*25m的楼面,共七层。悬臂尺寸为7.15m。要悬挑如此大的长度,又保证悬挑楼面的正常使用是有一定难度的。最后选用预应力悬臂空腹桁架作为楼面承重结构,达到预期效果。本文通过对同济大学图书馆新楼的预应力悬臂空腹杵架的设计,着重研究以下内容:1.预应力对超静定结构的影响;2.一预应力空腹桁架结构的内力分析方法。 相似文献
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Shear deformations can affect final member-end-moments for statically indeterminate continuous beams and frame structures, though for typical civil engineering structures their effect is small and moments can be based on flexural deformations only. When a member is deep relative to span length, however, shear deformations should be considered in the analysis. This can be included in the stiffness method and in a modified form of moment distribution where the carry-over factor is less than one-half due to the added flexibility from shear. In a prior paper the first author presented a new approach for solving statically indeterminate beams and bridge frames, with final end moments given in closed-form expressions. The advantages of this new approach are that no simultaneous equations are required as in the stiffness method, moments are not distributed back and forth as in moment distribution, and manual calculations may be used which give exact results for as many spans as desired. While only flexural deformations were considered in the original paper, this paper presents a closed-form approach that has been modified to include shear deformations. Final expressions are given for continuous beams and bridge frames, providing exact member-end-moments that match results from the stiffness method when shear deformations are included in the analysis. 相似文献
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