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单选题 某梁的横截面如图所示.
点为截面形心,
轴为中性轴,
点的剪应力计算公式是
,式中的"b"是:( ) 
A. 
B. 
C. 
D. 
学科：默认课程
时间：2026-01-13 16:50:14
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题目1单选题
一矩形截面悬臂梁自由端受到力F的作用,其上A、B两处的正应力关系为_______. <img src="https://tihai-oss-cloud.itihey.com/img/4a308014bdbe1ecb1356bf40b2c70afa.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/6959559e82e8628a98f57f0c690d00d9.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/36cb95e107be5c4a1a1560a8dd231c0f.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/e1df9fa9dd8e815deef41608a3df5617.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/bf310a1b6ed8cf971c61640aedbf5ff9.png">
题目2单选题
矩形截面梁在作用在纵向对称平面内的横向外力作用下发生对称弯曲, 图示横截面上a、b、c三点切应力的关系为 <img src="https://tihai-oss-cloud.itihey.com/img/d2f75b1434e7e9d7f75bb00e3295520b.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/a905106dda8fafdb341d692b265ec609.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/134c5a46bca6a4b6915846acf5293309.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/a872b1a58ff91ae27a3180e01c649b95.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/7d6661bc2a8cabd9d0da6a3210e53451.webp">
题目3单选题
梁的横截面形状如图所示,圆截面上半部分有一个圆孔.在xy平面内作用有正弯矩M, 图中A、B、C、D四点中弯曲正应力绝对值最大的点为 <img src="https://tihai-oss-cloud.itihey.com/img/94461ba46e616e40223bdc1629199ee3.png">A. D点B. B点C. C点D. A点
题目4单选题
图示工字钢简支梁,弹性模量E=200GPa.若在力偶矩<img src="https://tihai-oss-cloud.itihey.com/img/ba4c74fd4780d3661b24a67495011a20.webp">作用下测得 横截面A处梁顶面的纵向应变<img src="https://tihai-oss-cloud.itihey.com/img/1441ae53ee9287ac0d62d645fdc0cae9.webp">,则梁内最大弯曲正应力<img src="https://tihai-oss-cloud.itihey.com/img/8a2bbbfcddafa8aa88190053af92bd16.webp">= <img src="https://tihai-oss-cloud.itihey.com/img/acef5a3c46c98f424cad4b3d414615b7.png">A. 30 MPaB. 120 MPaC. 180 MPaD. 60 MPa
题目5单选题
某梁的横截面如图所示.<img src="https://tihai-oss-cloud.itihey.com/img/e51c8522597750d154921671aa72e130.png">点为截面形心,<img src="https://tihai-oss-cloud.itihey.com/img/843e037ae346df74111ec60edc8e8594.png">轴为中性轴,<img src="https://tihai-oss-cloud.itihey.com/img/5be38e9d9698be7bca2d0d58a3b3cbec.png">点的剪应力计算公式是<img src="https://tihai-oss-cloud.itihey.com/img/218237d38594700fe1dd33048eba1451.png">,式中的"b"是:( ) <img src="https://tihai-oss-cloud.itihey.com/img/3cbce9fecc0f26086f333aa8cf32da84.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/142d98514bd24c9f6ce050fdfa530650.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/ccf004e77d18a94220d2fc98734fa570.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/d5c584ccc101da48adcfade0ac5c7630.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/1e74b0f8e383525d643bd2cb68decc2e.png">
题目6单选题
在梁弯曲切应力的计算公式中 ,若要计算图示矩形截面A点的切应力,则 Sz=______.(图中长度单位为mm) <img src="https://tihai-oss-cloud.itihey.com/img/d9504a0ec85ae547c5b9a8140f81c4ee.png">A. 32×103<img src="https://tihai-oss-cloud.itihey.com/img/e09c68a4c04eab50fa50403192853036.webp">B. 42.7×103<img src="https://tihai-oss-cloud.itihey.com/img/e09c68a4c04eab50fa50403192853036.webp">C. 24×103<img src="https://tihai-oss-cloud.itihey.com/img/e09c68a4c04eab50fa50403192853036.webp">D. 16×103<img src="https://tihai-oss-cloud.itihey.com/img/e09c68a4c04eab50fa50403192853036.webp">
题目7单选题
下述关于横向弯曲切应力的讨论,正确的是( )A. 它在中性轴上为零B. 和弯矩对梁的挠度的影响处于同一量级C. 它仅在横截面上存在,在纵截面上不存在D. 其计算公式中的静矩是横截面上某部分面积关于中性轴的一次矩
题目8单选题
图示的矩形截面外伸梁ABC中,B截面有绝对值最大的弯矩 FL.B截面的实际情况是在梁的侧面中央穿一个直径为d的通孔,以便于安装铰结处的销子,如题图所示.关于B截面最大弯曲正应力的分析中,只有 ______才是正确的. <img src="https://tihai-oss-cloud.itihey.com/img/d255b9b5161a0034c26fd570ebbb8b3f.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/500ef765d7cc91fa7d800dd6ab97b4c4.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/22265b3c65527eeb72640a3125a2b204.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/0a1dbedac58e0e048e4970f382ddde67.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/d36a4e9593bc8d23c8e8d9003c6364e6.png">
题目9单选题
如图所示的悬臂梁,自由端受力偶m的作用,关于梁中性层上正应力<img src="https://tihai-oss-cloud.itihey.com/img/9a9610e9ec44905df6173283c1e9c3bf.png">及切应力<img src="https://tihai-oss-cloud.itihey.com/img/22a8589dc34c53ff26e52cadea605f6f.png">的下列四种表述中,只有 是正确的. <img src="https://tihai-oss-cloud.itihey.com/img/3b33314aeb69f87c42a0a34ac6407f19.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/b5c14e11328178c41bf9881d7e3f40fa.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/9d1756cb7569f998292ae0c93f39069d.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/8e754e032674d43662bcb3bd0e359c54.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/c5601015cb96169822cd97d6f79a1143.png">
题目10单选题
图示梁的A、B、C、D四点中,在任何截面上应力都为零的点为( ). <img src="https://tihai-oss-cloud.itihey.com/img/d0b5d71204413ed8bb38b27181f6e414.jpg">A. B点B. A点C. D点D. C点
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