以12 000 k N船用构件力学性能检测平台油缸座为研究对象,根据测试平台的尺寸和实现的功能设计了油缸座结构,对相关参数进行计算,给出其三维模型;利用有限元方法对油缸座进行了静力学分析与冲击动力学分析。分析结果表明,油缸座在极限...以12 000 k N船用构件力学性能检测平台油缸座为研究对象,根据测试平台的尺寸和实现的功能设计了油缸座结构,对相关参数进行计算,给出其三维模型;利用有限元方法对油缸座进行了静力学分析与冲击动力学分析。分析结果表明,油缸座在极限静载荷及冲击载荷作用下的最大应力均未超过材料屈服极限,验证了油缸座结构的合理性。当试样断裂时,油缸座的应力峰值比静力学分析结果提高了54%左右,因此对于大型结构试验机而言,有必要对关键受力零部件进行冲击动力学分析。展开更多
In order to analyze the dynamic response of pavement on long-span steel bridge decks under random dynamic loads, the irregularities of the pavement surface is simulated with the power spectrum density function, and th...In order to analyze the dynamic response of pavement on long-span steel bridge decks under random dynamic loads, the irregularities of the pavement surface is simulated with the power spectrum density function, and the random load is calculated according to a vehicle vibration equation of vehicle model. The mechanical responses of three different cases are compared by using a transient dynamic analysis method, i. e., under random dynamic load, constant moving load and dead load respectively. The results indicate that the mid-span of two adjacent transversal diaphragms is the worst load position. The maximum vertical displacement and the maximum transversal tensile stress of the pavement are 1.33 times and 1.39 times as much as those when only considering the impact coefficients. This study not only provides a theoretical basis for the mixture design and structural design of pavement, but also puts forward higher demand on the construction and maintenance for steel deck pavement.展开更多
文摘以12 000 k N船用构件力学性能检测平台油缸座为研究对象,根据测试平台的尺寸和实现的功能设计了油缸座结构,对相关参数进行计算,给出其三维模型;利用有限元方法对油缸座进行了静力学分析与冲击动力学分析。分析结果表明,油缸座在极限静载荷及冲击载荷作用下的最大应力均未超过材料屈服极限,验证了油缸座结构的合理性。当试样断裂时,油缸座的应力峰值比静力学分析结果提高了54%左右,因此对于大型结构试验机而言,有必要对关键受力零部件进行冲击动力学分析。
基金The National Natural Science Foundation of China(No.50578038)the Ph.D.Programs Foundation of Ministry of Education of China(No.20050286008)
文摘In order to analyze the dynamic response of pavement on long-span steel bridge decks under random dynamic loads, the irregularities of the pavement surface is simulated with the power spectrum density function, and the random load is calculated according to a vehicle vibration equation of vehicle model. The mechanical responses of three different cases are compared by using a transient dynamic analysis method, i. e., under random dynamic load, constant moving load and dead load respectively. The results indicate that the mid-span of two adjacent transversal diaphragms is the worst load position. The maximum vertical displacement and the maximum transversal tensile stress of the pavement are 1.33 times and 1.39 times as much as those when only considering the impact coefficients. This study not only provides a theoretical basis for the mixture design and structural design of pavement, but also puts forward higher demand on the construction and maintenance for steel deck pavement.
