简支梁桥设计说明书

1号梁: Qmax?(0.5×0.75×22.5×10.5+280×1.2+0.75)×0.555×1.238=234KN

Mmax?(0.5×28.66×5.625×10.5+280×5.625)×0.555×1.238

=1663.7KN/M

2号梁:Qmax?(0.5×0.75×22.5×10.5+280×1.2+0.75) 1.238×0.467=196.92

Mmax?(0.5×28.66×5.625×10.5+280×5.625)× 1.238×0.467=1399.9

3号梁: Qmax?(0.5×0.75×22.5×10.5+280×1.2+0.75) 1.238×0.386=162.76

Mmax?(0.5×28.66×5.625×10.5+280×5.625)× 1.238×0.386=1157.1

4号梁:Qmax?(0.5×0.75×22.5×10.5+280×1.2+0.75) 1.238×0.213=89.8

Mmax?(0.5×28.66×5.625×10.5+280×5.625)× 1.238×0.213=638.5

对于人群荷载

1号梁: Qmax?0.5×22.5×0.75×5.4×0.423=19.3KN

Mmax?0.5×28.66×5.625×5.4×0.423=184.12 KN

2号梁 Qmax?0.5×22.5×0.75×5.4×0.337=15.35 KN

Mmax?0.5×28.66×5.625×5.4×0.337=146.7 KN/M

3号梁 Qmax?0.5×22.5×0.75×5.4×0.252=11.48 KN

Mmax?0.5×28.66×5.625×5.4×0.252=109.7 KN/M

4号梁 Qmax?0.5×22.5×0.75×5.4×0.17=7.7 KN

Mmax?0.5×28.66×5.625×5.4×0.17=74 KN.M

3) 求变化点截面的最大弯矩和最大剪力:

采用直接加载求活载内力,计算图示如下图:

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活载内力计算如下表: 表3-6 梁号 汽车 荷载 1 2 721.35 3 658.26 4 363.2

Mmax 946.6 KN.M Qmax 211.6 KN 人群 荷载 213.6 216.49 161 Mmax 104.7 KN.M 83.4 62.4 42.1 Qmax 270.4 KN 101.26 65.33 44.76 4) 求支点截面最大剪力

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采用直线加载求活载内力,计算图示如下:

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