第五章作业（中英文对照）
时间：2020-10-18 13:25:39 来源：雅意学习网 本文已影响 人 
第 五 章 受弯 构件 一、选择题 1．对于承受均布荷载的热轧 H 型钢简支梁，应计算（
）
A．抗弯强度、腹板折算应力、整体稳定、局部稳定 B．抗弯强度、抗剪强度、整体稳定、局部稳定 C．抗弯强度、腹板上边缘局部承压强度、整体稳定、容许挠度 D．抗弯强度、抗剪强度、整体稳定、容许挠度 1. For hot rolled H-shaped cross section steel beam bearing distributed load, (
) should be checked. A．bending strength, equivalent stress on the web, overall stability and local stability. B．bending strength, shear strength, overall stability and local stability. C．bending strength, local bearing stress at upper edge of the web, overall stability. D．bending strength, , shear strength, overall stability, allowable deflection.
2．以下计算，使用毛截面特性的是（
）
A．梁的弯曲正应力
B．梁的剪应力
C．折算应力
D．疲劳验算 2. In which of the following calculation, the gross-section characteristic is adapted? (
) A．Bending normal stress of the beam
B．Shear stress of the beam C．Equivalent stress
D．Fatigue check
3．某一在主平面内受弯的实腹式构件，当截面上有螺栓孔时，下列何项计算要考虑孔洞削弱？（
）
A．构件变形计算
B．构件整体稳定性计算
C．构件抗弯强度计算
D．构件抗剪强度计算 3. For solid-web members bending in principle plane, supposing that bolt holes appears in the cross-section, weaken factors of the bolt holes should be considered during the calculation of (
). A．calculating the deformation of the member
B．checking the overall stability of the member C．checking the bending strength of the member D．checking the shear strength of the member
4．设计焊接工字形截面梁时，腹板布置横向加劲肋的主要目的是提高梁的(
) A．抗弯刚度
B．抗弯强度
C．整体稳定性
D．局部稳定性 4. In the design of the welded I-shaped cross section beams, the main target of arranging transverse stiffeners to the webs is to ensure the (
) of the beam A．Flexural stiffness B．Flexural resistance C．overall stability D．local stability
5．梁的支承加劲肋应设置在（
）
A．弯曲应力大的区段
B．剪应力大的区段
C．上翼缘或下翼缘有固定作用力的部位
D．有吊车轮压的部位 5. Bearing stiffeners should be arranged at (
) of the beam A．where the bending stress is great B．where the shear stress is great C．where the concentrated force acted D．where the wheel load acted
6．在梁的整体稳定计算中，若稳定系数为 1.0，说明该梁（
）
A．处于弹性工作阶段
B．不会丧失整体稳定 C．梁的局部稳定必然满足
D．不会发生强度破坏 6. During the calculation to the overall stability of the beam, the condition that the stability coefficient is 1.0 indicates that (
) A．the beam is in elastic stage B．overall buckling would not happen C．the beam would satisfy the requirements of avoiding local buckling D．the strength failure would not happen
7．梁承受固定集中荷载作用，采用以下何项措施是合适的？（
）
A．加厚翼缘
B．在集中荷载作用处设置支承加劲肋 C．增加横向加劲肋的数量
D．加厚腹板 7. For beam bearing the determined concentrated load, which of the following effects is favorable? (
) A．Thicken the flange of the beam B．Arrange bearing stiffeners at where the concentrated loads applied C．Increase the number of the transverse stiffeners. D．Thicken the web of the beam
8．验算无集中荷载作用时工字形截面梁的折算应力，公式为 f12 23 ，这里、 应为 （）
A．验算截面的最大正应力和最大剪应力 B．验算截面的最大正应力和验算点的剪应力 C．验算截面的最大剪应力和验算点的正应力
D．验算截面中验算点的正应力和剪应力 8. While checking the equivalent stress of the I-shaped cross-section beam without bearing concentrated loads, the expressionf12 23 is applied. In this expression, ,
represents (
). A．the maximum normal stress and shear stress of the checking section; B．the maximum normal stress of the checking section and the shear stress of the checking point; C．the maximum shear stress of the checking section and the normal stress of the checking point;
D．the normal stress and shear stress of the checking point in the checking section
9．跨中无侧向支承的焊接截面梁，当验算整体稳定不满足时，宜采取以下何项措施？（
）。
A．加大梁的截面积
B．加大梁的高度 C．加大受压翼缘板的宽度
D．加大腹板的厚度 9. For welded cross section beams without the lateral supports in the mid-span, if the overall stability could not be satisfied, which of the following measures should be adapted? (
) A．Increase the cross-section of the beam B．Increase the height of the beam C．Widen the width of the flange under compression D．Thicken the web of the beam
10．受压翼缘由刚性铺板连牢的梁，不必考虑计算的是（
）。
A．强度
B．刚度
C．整体稳定
D．局部稳定 10. For beam that rigid decking is securely connected to the compression flange of it, it is not necessary to check the (
) of the beam. A．strength B．stiffness C．overall stability D．local stability
11．双轴对称工字形截面梁，经验算，其强度和刚度正好满足要求，而腹板在弯曲应力作用下有发生局部失稳的可能。在其他条件不变的情况下，宜采用下列何种方法可以保证梁的局部稳定？（
）
A．增加梁腹板的厚度
B．降低梁腹板的高度 C．用强度更高的材料
D．设置加劲肋 11. For double symmetric I-shaped cross section beam, local buckling is possible to appears under the action of the flexural stress while the strength and the stiffness can just be satisfied through the checks. If maintaining other conditions being equal, which of the following measures could ensure the local stability of the beam? (
) A．Increase the thickness of the web B．Reduce the height of the web C．Adapt materials with higher strength D．Arrange lateral supports
12．验算工字形截面梁受压翼缘的局部稳定性时要求 / b t 应小于某一限值，这里， b 的含义为（
）。
A．翼缘板外伸宽度
B．翼缘板全部宽度 C．翼缘板全部宽度的 1/3
D．翼缘板的有效宽度 12. While checking the local stability of the compressed flange of the I-shaped cross section beam, the / b t
should below a determined limit. Here, b represents (
). A．the outstands of the flange
B．the width of the flange C．the 1/3 width of the flange D．the effective width of the flange
13．防止梁腹板发生局部失稳，常采取加劲措施，这是为了（）
A．增加梁截面的惯性矩
B．增加截面面积 C．改变构件的应力分布状态
D．改变边界约束板件的宽厚比 13. In order to prevent the local bucking of the web of the beam, arranging the stiffeners to the web is adapted, so as to (
). A．increase the inertia moment of the beam section B．increase the area of cross section C．change the stress distributing state of the beam D．change the width to thickness ratio of the boundary constraint plates
14．焊接工字形截面梁设计时估算最小梁高minh ，若用Q345 钢材代替 Q235 钢材，则minh如何变化？（
）
A．变大了
B．变小了
C．不变
D．条件不充足，无法确定 14. The estimating minimum height of the welded I-shaped section beam is minh, if the Q345 is applied to replace the Q235 steel, how would the value of minh change? (
). A．Increasing B．Decreasing C．Invariant
D．The variation can not be determined due to the lack of conditions
15．加强受压翼缘的单轴对称工字形等截面简支梁，跨中有一集中荷载作用在腹板平面内，下列各荷载作用位置。何者的整体稳定性最好？（
）
A．上翼缘(受压翼缘)上表面
B．形心与上翼缘之间的截面剪力中心 C．截面形心
D．下翼缘(受拉翼缘)下表面 15. For reinforced compression flange with singly symmetric I-shaped simple support beam with uniform section, a concentrated force is applied to the mid-span web plane. Which of the following load positions is most favorable to the overall stability of the beam?(
). A．The upper surface of the upper flange (the flange under compression) B．Shear center of the section between the centroid and the upper flange C．Centroid of the section D．The lower surface of the bottom flange (the flange under tension)
16．对于焊接工字形等截面简支梁，当其整体稳定性不能满足要求时，采用下列何项措施能最有效提高整体稳定性？（
）
A．加厚受压翼缘
B．加厚受拉翼缘 C．采用更高强度的钢材
D．在梁跨中受压翼缘处设置侧向支承
16. For welded I-shaped uniform section simply support beam, if the overall stability of the beam could not be satisfied, the overall stability can be improved by which of the following measures?(
) A．Thicken the compression flange B．Thicken the tension flange C．Adapt the steel with higher strength D．Arrange the lateral support at the mid-span compression flange of the beam
17．某焊接工字形等截面简支梁，若最大弯矩值一定，在下列不同形式的荷载作用下，何者的整体稳定性最差？（
）
A．两端有相等弯矩作用(纯弯曲作用)
B．满跨均布荷载作用 C．跨中点有集中荷载作用 D．在距离支座 1/4 跨度处各有相同一集中力 17. For welded I-shaped uniform section simply support beam, if the maximum moment is determined, under which type of the following loads the overall stability is most unfavorable?(
) A．There are same valued moment applied to both ends of the beam (pure bending actions) B．There are distributed force applying to the full-span of the beam. C．There is a concentrated force applying to the mid-span of the beam. D．There are two same concentrated forces applying to the 1/4 span away from the support of beam.
18．一焊接工字形截面梁，腹板计算高度0h ＝2400mm，根据腹板局部稳定计算和构造要求，需要在腹板一侧配置钢板横向加劲肋，其经济合理的截面尺寸是（
）
A.－8×120
B.－8×140
C.－10×150
D.－12×180 18. For welded I-shaped section beam, the effective height of the web 0h＝2400mm, in accordance with the calculation to the local stability of the web and the construction requirements, the transverse stiffeners should be arranged to one side of the web. Therefore, which dimension of the transverse stiffeners is both economical and reasonable?(
)
A.－120×8
B.－140×8
C.－150×10
D.－180×12
19.为了提高荷载作用在上翼缘简支工字形梁的整体稳定性，可在梁的（
）加侧向支承，以减小梁出平面的长度。
A.梁腹板高度的12处
B.靠近梁上翼缘的腹板01 1( ~ )5 4h处 C.靠近梁下翼缘的腹板01 1( ~ )5 4h处
D.上翼缘处 19. In order to improve the overall stability of the simple support I-shaped beam which the load is applied to the upper flange, lateral support can be arranged to the (
) of the beam, which
aims at reducing the out-of plane length of the beam. A. 1/2 height of the web
B. 1/5~1/4 height away from the upper flange of the web
C. 1/5~1/4 height away from the bottom flange of the web
D. upper flange
二、 简答题
1.简述影响钢梁整体稳定因素有哪些？
2.采用高强度钢材对提高梁的整体稳定性是否有益，为什么？
三、计算题 1. Simply support beam subjected to a uniformly distributed live load（no requirement of taking account of dead weight）,Q235 B steel is used. I32a， l =6m， allowable deflection 250] [l ，partial coefficient is 1.4for the dead loads and is 1.2 for live loads，bending moments about x-axis，according to normal stress and rigid condition, Determine design load of the beam. 2/ 235 ( mm N f y ，2/ 215 mm N f ， 45384xqlEI ,2 5/ 10 06 . 2 mm N E )。
2.A simply-support main beam shown in follow Figure, P=250kN（design value, from secondary beams）, Q235 steel is used，f=215N／mm2， Vf =125N／mm2, 05 . 1 x
1) Check the strength of the main beam.
2) Check the local stability of plates
3. The figure shows the welded I-shaped simple support beam. A lateral support is arranged at the mid-span upper flange of the beam, the material is Q345B, the design value of concentrated static
load P is 300kN.Please check the overall stability of the beam.
4. The span of a simple support beam is 5.5m, a static distributed load is applied to the upper flange of the beam, the standard value of dead load is 10.2kN/m (the dead weight is not concluded), the standard value of live load is 25kN/m. Supposed that the compression flange of the beam have the reliable lateral support, the steel is Q235, the allowable deflection is l/250, please select the most economic I-shaped and H-shaped cross sections, and compare them therefore. 5．P142
5.6 题
