1.(单选题)如下图所示单跨静定梁,求B截面处的弯矩。

A. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393298642.jpeg">

B. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393350945.jpeg">

C. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393373630.jpeg">

D. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393399873.png">

A.RD=20kN(↑)

B.RD=25kN(↑)

C.RD=45kN(↑)

D.RD=20kN(↓)

A.Q1=10kN、M1=10kN·m，Q2=0、M2=20kN·m

B.Q1=15kN、M1=10kN·m，Q2=0、M2=22kN·m

C.Q1=20kN、M1=15kN·m，Q2=5、M2=30kN·m

D.Q1=10kN、M1=20kN·m，Q2=0、M2=25kN·m

A. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392417235.jpeg">

B. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392467342.jpeg">

C. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392541136.jpeg">

D. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392607696.jpeg">

A.MA=-160kN·m，QA=8OkN

B.MA=-150kN·m，QA=60kN

C.MA=-180kN·m，QA=40kN

D.MA=180kN·m，QA=40kN

A.MB=-32kN·m，QB右=16kN

B.MB=-35kN·m，QB右=20kN

C.MB=32kN·m，QB右=20kN

D.MB=-40kN·m，QB右=35kN

A.Q1=7kN、M1=26kN·m

B.Q1=8kN、M1=30kN·m

C.Q1=11kN、M1=36kN·m

D.Q1=6kN、M1=20kN·m

A.Q1=0.75P、M₁=3.5Pa

B.Q1=P、M1=3Pa

C.Q1=1.25P、M₁=4Pa

D.Q1=1.5P、M₁=5.5Pa

A.Q2=5、M2=25kN·m，Q3=-20kN、m3 =10kN·m

B.Q2=0、M2=20kN·m，Q3=-10kN、m3 =10kN·m

C.Q2=0、M2=40kN·m，Q3=-15kN、m3 =10kN·m

D.Q2=0、M2=25kN·m，Q3=10kN、m3 =15kN·m