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问题 单项选择题 A3型题

某原料均化库厂房，跨度48m，柱距12m，采用三铰拱钢架结构，并设置有悬挂的胶带机通廊和纵向天窗，厂房剖面如图7-8a.所示。刚架梁（A1）、桁架式大檩条（A2）、椽条（A3）及屋面梁顶面水平支撑（A4）的局部布置简图如图7-8b.所示。屋面采用彩色压型钢板，跨度4m的冷弯型钢小檩条（图中未示出），支承在刚架梁和椽条上，小檩条沿屋面坡向的檩距为1.25m。跨度为5m的椽条（A3）支承在桁架式大檩条上；跨度12m的桁架式大檩条（A2）支承在刚架梁（A1）上，其沿屋面坡向的檩距为5m，刚架柱及柱间支撑（A7）的局部布置简图如图7-8c.所示。桁架式大檩条结构简图如图7-8d.所示。三铰拱刚架结构采用Q345B钢，手工焊接时使用E50型电焊条；其他结构均采用Q235B钢，手工焊接时使用E43型电焊条；所有焊接结构，要求焊缝质量等级为二级。

山墙骨架柱间距4m，上端支承在屋面横向水平支撑上；假定山墙骨架柱两端均为铰接，当迎风面山墙上的风荷载设计值为0.55kN／m时，试问，作用在刚架柱顶的风荷载设计值W（kN），与下列何项数值最为接近？提示：参见图7-8中c图，在刚架柱顶作用风荷载W。（）

A.217.8

B.161.0

C.108.9

D.80.5

答案

参考答案：C

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Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results_____(1) motivated behavior.Motivation can be either positive or negative_____(2) direction. We may feel a driving force toward some object or condition, _____(3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away_____(4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives_____(5) needs, wants or desires,_____(6) negative drives as fears or aversions._____ (7), though negative and positive motivational forces seem to differ dramatically_____(8) terms of physical and sometimes emotional activity, they are basically similar in_____(9) they both serve to initiate and sustain human behavior.____(10) this reason, researchers often refer _____(11) both kinds of drives or motives as needs, wants and desires.Goals, _____(12), can be either positive or negative. A positive goal is one toward_____ (13) behavior is directed and it is often referred to as an approach object. A negative goal is _____(14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to_____(15) types simply as goals. Consider this example. A middle-aged woman may wish to remain_____(16) attractive as possible. Her positive goal is to appear desirable, and_____(17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin_____(18) aging, and therefore she may buy and use face creams._____(19) the former case, she uses perfume to help her achieve her positive goal — attractiveness; in the____(20) case, she uses face creams to help avoid a negative goal — wrinkled skin.
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