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1.
海洋平台的灌浆卡箍技术研究   总被引:4,自引:0,他引:4  
在国内外文献研究的基础上,对钢质近海结构物的修理,加固方法做了较为深入的研究,利用丹麦学者N.S.Ottosen提出的多轴应力状态下混凝土强度理论Ottosen破坏准则,建立了钢与混凝土组合结构T型灌浆卡箍管节点的轴向受控,受压和面内弯矩作用下的非线性有限元计算模型,采用分级加载计算分析了相应的极限承载能力,并与试验结果进行比较分析,计算结果表明,经灌浆卡箍维修后的管节点应力分布,变形和极限承载能力都得到了明显的改善,所得结果较好地反映了实际结构的力学特性。  相似文献   

2.
朱振兴  杨璐  王法承  方成 《海洋工程》2019,37(4):98-106
为探究轴压作用下双金属复合海底管道的组合作用与承载性能,对双金属复合海底管道进行了试验研究和理论分析。开展了不锈钢衬管材料性能试验,对比了国际主流不锈钢本构关系模型和试验结果。利用ABAQUS建立了精细化的双金属复合管道轴压试验有限元模型,系统研究了关键参数如复合工艺产生的环向复合应力、钢管初始缺陷幅值等对双金属复合管在轴压作用下力学性能的影响规律。通过对比已有轴压双金属复合管道试验结果,验证有限元模型。基于验证的有限元模型,对轴压作用下双金属复合管道的组合作用以及径厚比和材料强度对承载力的影响进行了分析。结果表明双金属复合管道的轴压极限承载力主要取决于基管的截面屈服荷载,并随着管径和材料强度的提高而增大。并依据分析结果对双金属复合海底管道的设计提出建议。  相似文献   

3.
海洋平台T型相贯节点抗火性能研究   总被引:1,自引:0,他引:1  
利用有限元软件ABAQUS计算海洋平台T型相贯节点在火灾作用下的极限承载力,并对T型相贯节点进行火灾作用下的抗火性能及节点在降温段的力学性能分析,得出在不同火灾温度下节点的极限承载力.同时对计算结果进行了分析比较,通过参数分析,得到了T型相贯节点在火灾作用下节点极限承载力的变化规律.  相似文献   

4.
Truss Spar平台在风、浪、流的作用下,结构受力十分复杂,准确分析其疲劳强度相当困难。通过建立Truss Spar平台三维有限元模型,利用HydroD软件进行载荷预报、波浪搜索,得到产生最大应力幅响应的最不利浪向和相位角。运用Sestra软件进行整体有限元分析,得到的结果作为桁架管节点细化模型的边界条件,再用Nastran软件进行局部分析求得节点的热点应力,修正壁厚影响。最后根据DNV规范的S-N曲线计算了管节点的疲劳寿命。  相似文献   

5.
海洋平台管节点局部柔度对平台结构的名义应力、变形、构件的稳定性及振动周期、模态等均有不可忽视的影响,这一现象对深水平台尤为重要。对管节点局部柔度的研究,近年来已逐渐引起了注意。本文用半解析法对T、Y型管节点在轴力与面内弯矩作用下的局部柔度进行了计算,所得的结果与国外已有的经验公式与试验结果比较,证明是足够精确的,从而证明了本文的方法可准确有效地用以确定管节点的局部柔度。为了说明管节点局部柔度对平台结构的影响,文中给出了对一简单结构分别用传统方法和计及节点局部柔度的方法计算的结果及比较。  相似文献   

6.
为了拓展主S-N曲线法,使之更好地适用于低温、极地环境下船舶与海洋工程结构物的疲劳评估,进行了EH36材料T型焊接接头的低温疲劳性能试验,收集了国内外多个焊接节点低温疲劳数据,建立了疲劳试验试件的有限元模型,运用等效结构应力法,计算焊接节点的等效结构应力,构建低温环境下焊接节点的主S-N曲线。使用该曲线,预测低温疲劳试验的寿命,并与疲劳试验结果、常温主S-N曲线、常温中值D曲线的预测结果进行了比较,结果表明,所提低温主S-N曲线预测方法具有较高精度,可用于低温环境下船舶与海洋结构物疲劳寿命的预测。  相似文献   

7.
采用卷管法进行海底管道铺设过程中,管道首先通过牵引作用上卷于卷筒进行储存。管道与卷筒发生非线性接触,可能会产生复杂的塑性变形和局部屈曲。通过全尺寸柔性管力学性能试验获得柔性管轴力—应变以及弯曲—曲率等非线性力学性能关系,将试验所得的非线性材料性能参数导入建立的两种柔性管上卷ABAQUS有限元模型(梁—实体单元模型与壳和桁架—实体单元模型),实现柔性管较大轴向抗拉刚度和较小抗弯刚度的同步模拟以及管道与卷筒的非线性接触响应特征。通过对比分析两种有限元模型数值模拟得到的管道弯矩、弯曲曲率、管道轴力、管道与卷筒的接触压强等数据,发现在管道上卷过程中管道沿副法线方向的SM3弯矩占据其弯曲变形主导地位;管道与卷筒之间的摩擦效应对于管道轴力的影响较为显著;管道与卷筒的最大接触压强主要发生在卷管过渡段区域。  相似文献   

8.
海洋工程钢结构在服役过程中,受风、浪、流或地震等极端循环载荷的影响,易发生超低周疲劳断裂破坏,造成人员伤亡及财产损失,因此超低周疲劳断裂分析及寿命预测对于海工结构安全性评估至关重要。然而,现阶段基于累积损伤理论提出的多种超低周疲劳寿命预测模型无法对多尺度节点实现统一预测,造成了实际工程应用的不便。因此文中基于循环孔洞扩张模型开展X型圆管节点超低周疲劳寿命预测。首先,开发了基于循环孔洞扩张模型的VUSDFLD程序,实现ABAQUS与FORTRAN子程序联合应用,利用有限元分析验证循环孔洞扩张模型在X型圆管节点超低周疲劳断裂分析中的有效性;其次,根据多组X型圆管节点超低周疲劳断裂有限元分析结果,在宏观层面提出了一种基于Manson-Coffin公式的超低周疲劳寿命预测公式;最后,依据Miner理论,将适用于等幅加载的超低周疲劳寿命公式扩展至变幅加载情况,验证了多种节点尺寸下超低周疲劳公式的适用性,为工程应用提供了理论依据。  相似文献   

9.
林海花  孙承猛  石强 《海洋工程》2020,38(6):142-150
KK型管节点是自升式平台桁架式桩腿中的一种管节点,其应力集中系数是影响桩腿疲劳寿命的重要参数。应力集中系数与管节点的几何形式密切相关,为分析KK型管节点应力集中系数对几何参数的敏感性,利用ANSYS软件对某KK型管节点进行几何参数化建模,利用有限元数值模拟方法对各工况下的热点应力进行分析,并分别计算各相应工况下的名义应力,然后将热点应力与名义应力相比得到不同几何参数下的热点应力集中系数。对计算结果进行整理分析,得到了KK型管节点应力集中系数对无量纲几何参数的敏感性规律。结果表明,应力集中系数与撑杆受力状态、管节点结构形式有关,在满足结构布置、建造工艺和其他安全性指标的前提下,分析结果能够为KK型管节点的结构设计和疲劳分析提供技术支撑。  相似文献   

10.
胡康  杨平  刘清超 《海洋工程》2023,41(3):85-95
旨在了解箱型梁在极端循环载荷下的极限强度特性。利用非线性有限元方法来研究裂纹箱型梁的极限弯矩,分析了5种裂纹模型,探讨了裂纹类型、裂纹位置和裂纹长度的影响。考虑了两种载荷形式应用生死单元法对双向循环弯曲下裂纹扩展进行了模拟;并将由循环载荷引起的累积塑性损伤和疲劳裂纹损伤均考虑在内。无论单向循环还是双向循环,单裂纹模型的极限弯矩均小于双裂纹模型的极限弯矩;单边裂纹是最危险的裂纹类型。进一步分析了极端循环载荷下裂纹箱型梁的极限强度折减机理,得出了极限强度折减归因于这两种损伤的耦合作用的结论,并通过其他箱型梁验证了其适用性。  相似文献   

11.
-The formulation of ring analogy method for the prediction of static strength (ductile collapse) of tubular T, X joints under axial compression based on the limit analysis of the ring with some assumptions is presented in this papaer. The regression formula for the effective length of the chord based on test results is established by means of the least square method. The results computed by the present semi-analytic formula are compared with previous results and test data. They are quite close to each other. The accuracy of the present formula depends on the reasonable selection of the effective length of the chord, which requires numerous test data.  相似文献   

12.
-A ring model is developed to investigate the ultimate strength of tubular X and XX joints in the case that the brace is compressed. In the present analysis, the tubular joint is made of elasto-perfectly-plastic material, and the arch element of the chord section intersecting with the brace is assumed to be rigid. It is found that when 6 plastic hinges for X joint and 8 plastic hinges Tor XX joint appear in the ring, the limit state is reached, and by means of the equivalent ring width Be formula proposed in a previous paper by the authors, the ultimate strength of tubular X and XX joints subjected to compression can be obtained.  相似文献   

13.
提出一种随机分布点蚀损伤的模拟方法,模拟点蚀在构件表面的随机生长过程,并建立了随机态点蚀损伤圆管截面的有限元分析模型;设计了三个受不同腐蚀深度点蚀损伤的圆管构件,并开展轴压试验,利用试验结果校验有限元模型的计算精度;在多种腐蚀情形下(点蚀强度和腐蚀深度变化),研究点蚀分布模式变化引起的极限强度退化及其变异性;比较随机分布点蚀模型与传统腐蚀模型(规则分布点蚀和均匀腐蚀)在计算强度和结构失效行为方面的差异。研究结果表明,点蚀的随机分布模式会引起显著的极限强度变异,且蚀坑深度越大,强度变异越大,蚀坑分布造成的强度极差与强度均值相比达到5%;随机分布点蚀相比于传统腐蚀模型,除了引起更为严重的强度削减,还会改变结构的破坏模式。提出的随机点蚀损伤的模拟方法,可替代昂贵的构件试验,应用于评估点蚀损伤圆管截面的极限强度,增强评估结果的可靠性。  相似文献   

14.
A series of tests were conducted in order to investigate the shear strength and deformation behavior of methane hydrate-bearing sediments during dissociation using the thermal recovery method or depressurization method. An innovative temperature-controlled high pressure triaxial apparatus which can reproduce the in situ conditions of hydrate reservoirs was used. The results indicate that: (1) the failure strength of isotropically consolidated methane hydrate-bearing sediments which dissociated completely using the thermal recovery method is less than that of pure Toyoura sand. However, the initial stiffness and volumetric strain are higher than that of pure Toyoura sand. (2) The thermal recovery method will cause the failure of methane hydrate-bearing sediments when the axial load is higher than the strength of methane hydrate-bearing sediments after dissociation. (3) The depressurization method will not cause collapse of methane hydrate-bearing sediments during depressurization. However, water pressure recovery will lead to failure when the axial load is larger than the strength of the methane hydrate-bearing sediments after dissociation. (4) The depressurization rate shows little effect on the ultimate deformation of methane hydrate-bearing sediments, while the initial deformation rate increases with increasing depressurization rate. (5) The larger the reduction of pore pressure, the larger axial strain and volumetric strain.  相似文献   

15.
In this paper a numerical analysis method combining FEM incemental technique with limit analysis concept is proposed for the study of the static strength of offshore platform in collision. Large deformation and plasticity are accounted for and the limit yield surface expressed by generalized stress for a tubular section is derived. The modified stiffness matrix of space beam element is formulated by Plastic Node Method. The buckling behavior of beam columns can also be taken into account. It can trace the generation of plastic hinges during loading and finally the ultimate strength of offshore platform against collision is obtained.  相似文献   

16.
近海固定平台碰撞的准静态分析   总被引:5,自引:1,他引:5  
本文采用增量有限元方法结合极限分析的概念,研究近海固定平台碰撞的静力强度。文中综合考虑了平台结构在碰撞加载过程中的大变形和塑性变形特性,建立了以广义应力表达的圆管截面的屈服条件,采用塑性节点法(PNM)推导得到了单元的弹塑性矩阵。文中也考虑了梁柱单元的屈曲情况。本文所采用的载荷增量法结合牛顿—拉夫逊迭代,可跟踪加载过程中平台结构上塑性铰的出现,并最终获得平台结构的极限承载能力。  相似文献   

17.
The axial friction response of subsea pipelines in soft clays is a very important aspect for designers of subsea pipelines but the response is not well understood so far. There is a pressing need for the comprehension of the response. In this paper, model tests are performed using full-scale pipes coated with polyethylene (PE) to study the effects of the set-up period, the pipe diameter, the buried depth of the pipe, the shear strength of soft clays and the loading rate on the axial friction response of pipelines in soft clays. The variations of the axial friction coefficient are analyzed using the effective stress method based on model test results. The results show that the axial friction resistance increases with the increasing pipe diameter but the effect of the pipe diameter on the axial friction coefficient can be neglected. The ultimate axial resistance also increases with the increase of the buried depth of pipelines, the undrained shear strength of soft clays and the loading rate. The axial friction coefficient increases with the increasing loading rate. However, the axial friction coefficient decreases with the increasing buried depth. The method to determine the axial friction coefficient is developed by analyzing model test results, which considers the effects of the diameter, the buried depth, the undrained shear strength of soft clays and the loading rate. The study results not only extend the industry data base but also supply a basis to determine the axial friction coefficient of PE-coated pipes in soft clays for ocean engineering geological investigations.  相似文献   

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