一、汽车荷载横向分布计算
..................................................................................................................30
二、求弹性支承的刚度系数
..................................................................................................................30
三、建立横梁模型
..................................................................................................................................31
四、用移动荷载法求影响线
..................................................................................................................31
五、确定最不利桁架
..............................................................................................................................32
六、求中桁的横向分布系数
..................................................................................................................33
第三节 公路桥面横向分布系数计算.........................................................................................................34
一、计算方法
..........................................................................................................................................34
杠杆法,即取跨中处的横梁为简支梁,将其与桁架的连接简化为刚性支承,横梁上的列车活载
通过刚性支承传到桁架上。
..................................................................................................................34
二、求横向分布系数
..............................................................................................................................34
三、确定最不利桁架
..............................................................................................................................35
第四节 活载力分析.....................................................................................................................................35
一、分析思路
..........................................................................................................................................35
二、求汽车活载下的力
..........................................................................................................................35
第一节 力检算.............................................................................................................................................39
一、上弦杆件检算
..................................................................................................................................39
二、下弦杆件检算
..................................................................................................................................40
第二节 疲劳检算.........................................................................................................................................41
一、上弦杆件
21
单元疲劳检算
....................................................................................................... .....42
二、下弦杆件
117
单元疲劳检算
.............................................................................................. ............42
第三节 刚度检算.........................................................................................................................................43
一、中桁上弦控制节点(
40
)的垂直挠度值
......................................................................................43
二、中桁下弦控制节点(
119
)的垂直挠度值
.................................................................................. ..43
三、刚度检算
..........................................................................................................................................44
第七章 性能评价..........................................................44
一、恒载力
..............................................................................................................................................44
二、活载力
..............................................................................................................................................44
三、结构刚度
..........................................................................................................................................44
四、不妥之处
..........................................................................................................................................44
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