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矩形截面简支钢梁，跨中受集中力P作用，试问，当集中力增大为2P，梁高度变为原来的2倍，其余条件不变，则跨中截面最大弯曲应力是原来的（）。
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矩形截面简支钢梁，跨中受集中力P作用，试问，当集中力增大为2P，梁高度变为原来的2倍，其余条件不变，则跨中截面最大弯曲应力是原来的（）。
A、1/4倍
B、1/2倍
C、1倍
D、2倍
时间：2022-01-17 14:04
关键词：
1A411000建筑结构与构造
建筑工程
CMS专题
一级建造师
答案解析
B
集中力增大为2P时，跨中弯矩M增大为原来的2倍，同时截面模量W也增大为原来的4倍，故跨中截面最大弯矩应力σ=M/W变为原来的1／2。
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