共查询到10条相似文献，搜索用时 281 毫秒
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Krzysztof Śliwka 《Journal of Wood Science》2018,64(5):578-590
The paper focuses on timber structures. Static analysis was performed in the paper of timber lattice columns with N and V lattice configuration made in variants of timber, plywood, fibreboard and particleboard. As a part of the study, formulae determining critical force in the column and the column slenderness ratio were derived basing on the theory by Timoshenko and Gere. In addition, the paper includes formulae applicable to shearing forces occurring in the column as well as maximum shearing forces that a column can carry, also based on the theory by Timoshenko and Gere. Basing on the formulae described above and the formulae given in the literature (EN-1995 Eurocode 5 Standard), a comparative analysis was carried out of the load-bearing capacity of columns and calculations for the truss. The calculations demonstrate that there are discrepancies between the static values being compared and both calculation methods lead to partially divergent results. 相似文献
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H. Heräjärvi 《Wood Science and Technology》2004,37(6):523-530
The purpose of this study was to determine the modulus of elasticity (MOE) and the modulus of rupture (MOR) in the radial bending test for small, clear specimens of Finnish birch (Betula pendula Roth and B. pubescens Ehrh) wood originating from mature trees. The dependency of MOE and MOR on the specific gravity of birch wood was studied, and the relationship between MOE and MOR was modelled at the different heights and at the different distances from the pith of the tree. For B. pendula, the mean values for MOE and MOR were 14.5 GPa and 114 MPa, whereas B. pubescens had means of 13.2 GPa and 104 MPa, respectively. At the corresponding specific gravity, the bending stiffness and strength values did not differ between the two species. The results indicated a linear relationship between the MOE and MOR, irrespective of the birch species or the within-stem location. Both MOE and MOR increased clearly from the pith towards the surface of the tree and decreased slightly from the base to the top of the tree. It seems that if products with as high stiffness and bending strength as possible are wanted, sorting of raw materials into different grades according to their within-tree origin can be of value. 相似文献
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依托某自锚式悬索桥配重跨静载试验工程实际,对悬索桥检测技术进行简单论述.介绍工程概况和检测原因,对桥梁进行外观检测和静载试验,并对桥梁静载试验数据进行分析,得出桥梁结构强度、正截面抗裂性、竖向刚度满足规范要求,为该桥的竣工验收及后期的安全运营提供了科学依据. 相似文献
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本文从桩的设计要求到施工方法、施工工艺、质量保证、问题处理等诸多方面,详细论述了预应力高强预制静压管桩的施工技术。 相似文献
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绥芬河转体施工斜拉桥静荷载试验 总被引：2，自引：0，他引：2
主要介绍绥芬河斜拉桥静荷载试验的主要内容和方法,并结合桥梁博士、BSAS 的理论分析结果,对该桥的实测应力、挠度及索力进行了比较。试验结果表明:该桥的理论分析和设计计算方法科学、可靠,且施工质量优良,桥梁的承载能力满足设计要求,可以按照设计荷载正常运营。 相似文献
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太浦河大桥静载试验研究 总被引：1，自引：0，他引：1
吴江市苏同黎太浦河大桥主桥上部结构为三跨预应力混凝土变截面连续箱梁。本文详细介绍太浦河大桥静载试验设计方案,包括：测试截面的选择、加载车型、重量以及加载工况、荷载效率系数的确定等。通过静载试验来确定主梁控制截面在试验荷载下的应变（应力）,主梁控制截面在试验荷载作用下的最大挠度,主梁在偏载作用下的影响系数以及梁体裂缝的开展情况等数据。由试验得出本桥在试验荷载作用下各测试截面的应力、挠度校验系数均小于1.0,表明该桥的承载能力满足正常使用的要求;各测试截面的相对残余应变和相对残余变位均小于20%,说明结构处于弹性工作状态。在该桥静载试验过程中完全按照既定的试验方案进行,通过静载试验得出该桥质量良好,安全可靠。 相似文献