共查询到19条相似文献,搜索用时 62 毫秒
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初应变对现浇混凝土屋面板内力的影响 总被引:2,自引:0,他引:2
针对混凝土屋面板因特殊的生成环境及使用环境而产生显著初变形的特征,采用ANSYS有限元分析软件,分析混凝土屋面板初应变产生的内力特性及开裂机理,并在总结归纳典型分析结果的基础上结合工程应用提出建议。希望所做的工作对这类构件的设计及施工提供有价值参考。 相似文献
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现浇混凝土屋面板的裂缝问题是工程中的通病问题,本文笔者结合自身的工作经验对现浇混凝土屋面板裂缝产生的原因进行分析,并针对其原因提出相对应的预防治理措施,以供同行在实际工程应用中参考。 相似文献
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现浇钢筋混凝土墙体立模施工根据不同情况各有不同,直线形竖向高度较大的墙体多采用滑模工艺;民用建筑中部分墙体有的采用大模板工艺。除此以外,工程中常有高度3米以上的大型现浇钢筋混凝土墙体,如地下室、大型水池以及其他构筑物墙体等。这些墙体的支模方法是施工的关键,因此,施工中应严格遵守以下要求:1.模板设计应有足够的刚度和稳定性,施工中能可靠地承受混凝土浇 相似文献
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阐述了现浇混凝土屋面的砖混房屋顶层墙体裂缝控制的方法 ,分析了屋顶层墙体裂缝出现的原因 ,提出了几种预防房屋顶层墙体裂缝的措施 相似文献
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通过对云南某厂房现浇混凝土楼面开裂原因进行理论计算并与实际检测结果进行比对分析,得出如下主要结论:采用的计算模型的分析结果与开裂检测结果吻合较好;通过混凝土拉应力的理论计算可以较准确地分析混凝土楼面开裂原因,必要时通过应力值还可进行各影响开裂因素权重的分析。同时提出如下建议:针对混凝土约束程度建立定量分析方法,以更准确地获得CX值进而更准确地分析混凝土收缩应力;除采用构造措施进行防治外,宜针对沉缩的量化计算方法展开研究,以便更好地防治混凝土沉缩裂缝;实际开裂鉴定工程中宜采取相应的量化计算以有效分析开裂原因及各因素造成开裂的权重;规范在相关部分引入开裂计算的已有成果,以供从业人员参考。 相似文献
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混凝土屋盖温度应力分析 总被引:1,自引:0,他引:1
主要研究了现浇混凝土肋梁屋盖常发生的开裂问题,针对屋盖结构特定的工作环境,应用结构有限元分析软件ANSYS对混凝土屋盖在变温作用下的效应进行了较系统的数值分析,初步揭示了屋面板裂缝开裂机理及裂缝分布特征. 相似文献
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爆炸荷载下混凝土梁中混凝土和钢筋应变率研究 总被引:1,自引:0,他引:1
钢筋和混凝土的应变率分析对混凝土梁的抗爆炸设计和验算至关重要.但是,爆炸荷载在混凝土梁中诱发的应变率远超出现有试验技术范围.目前的处理方法主要是将应变率(ε)假设为定值或采用加载率取代应变率,这样的简化直接降低了相关研究成果的科学性和可信度.根据爆炸荷载的作用特征,采用通用的单自由度模型,从杜哈姆(Duhamel)积分入手,研究爆炸荷载下钢筋混凝土梁任意截面应变率的分析方法,推导跨中截面应变率的计算式,分析跨中截面最大应变率及影响因素.分析结果较好地反映了混凝土梁的动力特性,为深入研究钢筋混凝土梁及其他受力构件在爆炸荷载下的动力响应特性提供了理论依据. 相似文献
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The experimental tests were conducted on the common concrete shear wall and the concrete cavity shear walls. Results indicate that the stiffness and ultimate capacity of the cavity shear walls are reduced and the ductility is improved; reasonable matching can be achieved among the stiffness, ultimate capacity, and ductility by changing the parameters of cavity. Subsequently, theoretical calculation models of shear wall with single cavity and multicavities are proposed; the calculating formula of the lateral displacement curve and the equivalent lateral stiffness of cavity shear wall is deduced under different lateral loads. The lateral response of both the through cavity shear wall and non‐through cavity shear wall can be calculated by using the continuous link method. Finally, the verification results of models with different parameters show that the theoretical calculation formula has enough accuracy, which can meet the needs of engineering estimation. 相似文献
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The paper presents the analysis of the post-buckling state in the elasto-plastic range of square plates subjected to uniform compression. Four boundary conditions along the unloaded edges are considered. The method is a combination of analytical and numerical solutions in which the Prandtl-Reuss equations are used. Different material stress-strain curves and initial imperfections such as: out-of-flatness and residual stresses are taken into account. The load-shortening curves for plates of different geometrical parameters and material properties are shown in diagrams. 相似文献
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Yacine Aït Oumeziane Sophie Moissette Marjorie Bart Florence Collet Sylvie Pretot Christophe Lanos 《Journal of Building Performance Simulation》2017,10(3):256-271
Building envelopes with bio-materials like hemp concrete are currently undergoing an increasing development due to their low environmental impact and their interesting hygrothermal properties. This kind of hygroscopic material is characterized by a hysteretic behaviour. In this paper, the influence of such behaviour on the hygrothermal response of a building wall is discussed. An experimental facility is designed to measure temperature and relative humidity within a hemp concrete wall submitted to climatic variations. This facility provides a set of experimental data suited for benchmarking. Numerical simulations are performed with a hysteresis model implemented in a heat and moisture transfer model. Comparisons between numerical and experimental results show that hysteresis modelling is relevant to simulate the hygrothermal response of the wall. The discussion is extended to the influence of the initial moisture content. 相似文献