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11.
针对船舶总纵极限强度极限状态方程不能以显式表达的实际情况,提出采用响应面与映射变换相结合的方法展开船舶总纵强度可靠性分析,指出相关随机变量在正态化前后相关系数的差异应予以考虑,并应用于实际船舶的计算,验证了理论的合理性。 相似文献
12.
13.
在整个盾构的掘进施工过程中,其始发段施工是事故频发的危险区段。为此,以武汉市地铁江汉路到积玉桥越江段施工为背景,选用FLAC3D软件对盾构穿过始发段全过程的土体扰动规律进行分析。数值仿真分析结果表明:在始发阶段盾构经过土体加固区时,土体横断面沉降槽呈现正态分布规律;将土体加固后,加固区的地表沉降很小,表明加固区土体受到的盾构施工扰动效应较非加固区明显减小;盾构中部通过加固区和非加固区分界面时地表沉降增加速率最大,盾构机前部和尾部通过时地表沉降增加的速率较小;盾构掘进过程中非加固区土层的沉降槽均呈现正态分布,盾构掘进主要影响盾构开挖洞口横向两侧18~22 m范围内土体,以及纵向15~20 m范围内的土体。 相似文献
14.
通过石环高速公路东互通立交桥的施工实践,研究总结了长距离、大跨径系杆拱桥、钢筋混凝土箱梁跨密集型铁路站场顶推施工的方案设计和顶推施工及质量控制措施,对同类桥梁的顶推施工具有很好的借鉴作用。 相似文献
15.
大型双壁钢围堰气囊法下水施工技术及经济分析 总被引:1,自引:0,他引:1
大型双壁钢围堰体积和质量大,其下水作业难度较大。气囊法下水施工技术能很好地解决这一难题,具有简便易行、经济实用的特点。此文以南京大胜关长江大桥主墩基础工程为例,介绍深水基础大型双壁钢围堰气囊下水施工技术的特点及其相应的控制技术和手段,对施工的具体工艺流程和操作步骤进行详细的阐述,对工程的施工组织设计和经济性进行深入分析和探讨。 相似文献
16.
本文提出了用灰色系统理论预测破坏载荷的计算方法,并通过新的高强度钢材环肋圆锥壳的球壳模型实验验证了该方法的正确性,建议今后在模型实验和现役潜艇的耐压船体寿命估算中采用这种方法。 相似文献
17.
A simple formulation for predicting the ultimate strength of ships 总被引:11,自引:0,他引:11
The aim of this study is to derive a simple analytical formula for predicting the ultimate collapse strength of a single- and double-hull ship under a vertical bending moment, and also to characterize the accuracy and applicability for earlier approximate formulations. It is known that a ship hull will reach the overall collapse state if both collapse of the compression flange and yielding of the tension flange occur. Side shells in the vicinity of the compression and the tension flanges will often fail also, but the material around the final neutral axis will remain in the elastic state. Based on this observation, a credible distribution of longitudinal stresses around the hull section at the overall collapse state is assumed, and an explicit analytical equation for calculating the hull ultimate strength is obtained. A comparison between the derived formula and existing expressions is made for largescale box girder models, a one-third-scale frigate hull model, and full-scale ship hulls.List of symbols
A
B
total sectional area of outer bottom
-
A
B
total sectional area of inner bottom
-
A
D
total sectional area of deck
-
A
S
half-sectional area of all sides (including longitudinal bulkheads and inner sides)
-
a
s
sectional area of a longitudinal stiffener with effective plating
-
b
breadth of plate between longitudinal stiffeners
-
D
hull depth
-
D
B
height of double bottom
-
E
Young's modulus
-
g
neutral axis position above the base line in the sagging condition or below the deck in the hogging condition
-
H
depth of hull section in linear elastic state
-
I
s
moment of inertia of a longitudinal stiffener with effective plating
-
l
length of a longitudinal stiffener between transverse beams
-
M
E
elastic bending moment
-
M
p
fully plastic bending moment of hull section
-
M
u
ultimate bending moment capacity of hull section
-
M
uh
,M
us
ultimate bending moment in hogging or sagging conditions
-
r
radius of gyration of a longitudinal stiffener with effective plating [=(I
s
/a
s
)1/2]
-
t
plate thickness
-
Z
elastic section modulus at the compression flange
-
Z
B
,Z
D
elastic section modulus at bottom or deck
-
slenderness ratio of plate between stiffeners [= (b/t)(y/E)1/2]
-
slenderness ratio of a longitudinal stiffener with effective plating [=(l/r)(y/E)1/2]
-
y
yield strength of the material
-
yB
,
yB
,
yD
yield strength of outer bottom, inner bottom
-
yS
deck, or side
-
u
ultimate buckling strength of the compression flange
-
uB
,
uB
,
uD
ultimate buckling strength of outer bottom
-
uS
inner bottom, deck, or side 相似文献
18.
19.
To ensure the safety of navigating ship, working loads and structural load-carrying capacity are two important aspects. In the present paper, a total simulation system combing load calculation and structural collapse analysis is applied to simulate progressive collapse behaviour of a single-hull Kamsarmax type bulk carrier. A three dimensional singularity distribution method is adopted to calculate pressure distribution with time history. A mixed structural model, collapse part simulated by ISUM elements and remaining part by elastic FEM elements with relative coarse mesh, is proposed for collapse analysis. Progressive collapse behaviour obtained by ISUM is good agreement with that by nonlinear software package, MARC. However, the calculation time of ISUM analysis is about 1/70 of MARC analysis. The applicability to structure system, high accuracy and sufficient efficiency of ISUM had been demonstrated. 相似文献
20.