张中昊, 段皓鹏, 于艳春, 支旭东, 范峰. 张弦双向网格型单层柱面网壳稳定性及可靠度分析[J]. 工程力学, 2022, 39(10): 161-172. DOI: 10.6052/j.issn.1000-4750.2021.06.0438
引用本文: 张中昊, 段皓鹏, 于艳春, 支旭东, 范峰. 张弦双向网格型单层柱面网壳稳定性及可靠度分析[J]. 工程力学, 2022, 39(10): 161-172. DOI: 10.6052/j.issn.1000-4750.2021.06.0438
ZHANG Zhong-hao, DUAN Hao-peng, YU Yan-chun, ZHI Xu-dong, FAN Feng. STABILITY AND RELIABILITY ANALYSIS OF TENSION-STRING BIDIRECTIONAL LATTICE MONOLAYER CYLINDRICAL RETICULATED SHELLS[J]. Engineering Mechanics, 2022, 39(10): 161-172. DOI: 10.6052/j.issn.1000-4750.2021.06.0438
Citation: ZHANG Zhong-hao, DUAN Hao-peng, YU Yan-chun, ZHI Xu-dong, FAN Feng. STABILITY AND RELIABILITY ANALYSIS OF TENSION-STRING BIDIRECTIONAL LATTICE MONOLAYER CYLINDRICAL RETICULATED SHELLS[J]. Engineering Mechanics, 2022, 39(10): 161-172. DOI: 10.6052/j.issn.1000-4750.2021.06.0438

张弦双向网格型单层柱面网壳稳定性及可靠度分析

STABILITY AND RELIABILITY ANALYSIS OF TENSION-STRING BIDIRECTIONAL LATTICE MONOLAYER CYLINDRICAL RETICULATED SHELLS

  • 摘要: 在双向网格型单层柱面网壳面外布置弦杆和拉索形成张弦结构体系,有效地增强了结构的承载能力。该文针对40 m、50 m、60 m跨度网壳,分析了网壳随预应力、矢跨比、初始缺陷以及拉索强度等参数变化对结构静力稳定性能的影响,并结合100 m和120 m大跨度网壳算例,论证了该结构体系的实用性。基于ANSYS和MATLAB响应面法,分析了网壳在承载力失效和变形失效两种失效形式下的的可靠度,获得了失效概率、可靠指标及其灵敏度和相关性。结果表明,布置弦杆和拉索后结构稳定承载力最大可提高744%。100 m跨度网壳的稳定承载力的失效概率为1.026 54×10−1,其可靠度相对较低。跨度小于60 m网壳的稳定承载力和变形的失效概率极小。网壳中拉索强度是影响结构稳定承载力的主要因素,大跨度网壳中拉索的影响相对减弱。拉索强度及弦杆内、外径对结构变形均产生一定影响。

     

    Abstract: Strings and cables are arranged outside the surface of bidirectional single-layer cylindrical reticulated shells to form a tensive-string structural system, which effectively enhances the strength of the structure. In this paper, the influences of the prestress, span ratio, initial defect and cable strength on the static stability of reticulated shells with spans of 40 m, 50 m and 60 m are analyzed. The practicability of the structural system is demonstrated by examples of reticulated shells with spans of 100 m and 120 m. Based on the response surface method of ANSYS and MATLAB, the reliability of reticulated shells under the failure modes of strength failure and deformation failure was analyzed. The failure probability, reliability index, sensitivity and correlation were obtained. The results show that the maximum stability strength of the structure was increased by 744% after arranging the chords and cables. The failure probability of the stability strength of the 100-m-span reticulated shell is 1.026 54×10−1, and its reliability is relatively low. The stability strength and failure probability of deformation of reticulated shells with spans less than 60 m are very small. The strength of the cable in the reticulated shell is the main factor affecting the stability of the structure. In large-span reticulated shells, the influence of cables is relatively weak. The tensile strength and the inner and outer diameters of chords have a certain influence on the structural deformation.

     

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