Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method and system for calculating safety coefficient of main cable of suspension bridge based on secondary stress effect
The invention relates to a method and a system for calculating a safety coefficient of a main cable of a suspension bridge based on a secondary stress effect. The method comprises the following steps: establishing a finite element model of the bridge; based on the bridge finite element model, determining the most unfavorable stress of the main cable based on the cable structure theory under the action of the most unfavorable live load as the cable unit stress response of the main cable; calculating and evaluating the secondary stress of the main cable according to the secondary stress effect based on the cable unit stress response of the main cable; integrating the stress response of the cable unit and the secondary stress effect, evaluating the most unfavorable stress response of the main cable, and establishing a limit state judgment model by taking the limit strength of the main cable as a failure judgment condition; establishing a probability distribution model of the structure; setting an initial main cable design safety coefficient, and calculating a failure probability and a reliability index of the main cable; iteration is carried out through an inverse reliability method, the number of designed strands of the main cable is changed, and a reliability index is solved. Compared with the prior art, the method has the advantages of more accurate calculation, high engineering practicability and the like.
本发明涉及一种基于二次应力效应计算悬索桥主缆安全系数的方法和系统，方法包括以下步骤：建立桥梁的有限元模型；基于桥梁有限元模型，确定最不利活载作用下基于索结构理论的主缆最不利应力，作为主缆的索单元应力响应；基于主缆的索单元应力响应，根据二次应力效应计算并评估主缆二次应力的大小；综合索单元应力响应和二次应力效应，评估主缆最不利应力响应大小，以主缆极限强度为失效判断条件，建立极限状态判断模型；建立结构的概率分布模型；设定初始的主缆设计安全系数，计算主缆的失效概率及可靠度指标；通过逆可靠度方法进行迭代，改变主缆设计股数，求解可靠度指标。与现有技术相比，本发明具有计算更加精确、工程实用性强等优点。
Method and system for calculating safety coefficient of main cable of suspension bridge based on secondary stress effect
The invention relates to a method and a system for calculating a safety coefficient of a main cable of a suspension bridge based on a secondary stress effect. The method comprises the following steps: establishing a finite element model of the bridge; based on the bridge finite element model, determining the most unfavorable stress of the main cable based on the cable structure theory under the action of the most unfavorable live load as the cable unit stress response of the main cable; calculating and evaluating the secondary stress of the main cable according to the secondary stress effect based on the cable unit stress response of the main cable; integrating the stress response of the cable unit and the secondary stress effect, evaluating the most unfavorable stress response of the main cable, and establishing a limit state judgment model by taking the limit strength of the main cable as a failure judgment condition; establishing a probability distribution model of the structure; setting an initial main cable design safety coefficient, and calculating a failure probability and a reliability index of the main cable; iteration is carried out through an inverse reliability method, the number of designed strands of the main cable is changed, and a reliability index is solved. Compared with the prior art, the method has the advantages of more accurate calculation, high engineering practicability and the like.
本发明涉及一种基于二次应力效应计算悬索桥主缆安全系数的方法和系统，方法包括以下步骤：建立桥梁的有限元模型；基于桥梁有限元模型，确定最不利活载作用下基于索结构理论的主缆最不利应力，作为主缆的索单元应力响应；基于主缆的索单元应力响应，根据二次应力效应计算并评估主缆二次应力的大小；综合索单元应力响应和二次应力效应，评估主缆最不利应力响应大小，以主缆极限强度为失效判断条件，建立极限状态判断模型；建立结构的概率分布模型；设定初始的主缆设计安全系数，计算主缆的失效概率及可靠度指标；通过逆可靠度方法进行迭代，改变主缆设计股数，求解可靠度指标。与现有技术相比，本发明具有计算更加精确、工程实用性强等优点。
Method and system for calculating safety coefficient of main cable of suspension bridge based on secondary stress effect
基于二次应力效应计算悬索桥主缆安全系数的方法和系统
SUN BIN (Autor:in) / SONG CHAOLIN (Autor:in) / XIAO RUCHENG (Autor:in)
28.01.2025
Patent
Elektronische Ressource
Chinesisch
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| Europäisches Patentamt | 2024