電大建筑力學(xué)形成性考核冊(cè)作業(yè)答案

電大【建筑力學(xué)】形成性考核冊(cè)答案一、選擇題1.B 2.C 3.C 4.C 5.B6.D 7.B 8.D 9.A 10.D二、填空題1、垂直線2、中心線 背離研究對(duì)象3、研究對(duì)象 全部作用力4、平行 原力對(duì)新作用點(diǎn)5、無關(guān) 力偶矩大小6、力偶7、壓力8、自由度9、虛鉸 瞬鉸10、三角形三、計(jì)算題1.2. 3、見教材34頁例題4.解：體系內(nèi)幾何不變，且無多余約束。5、解：6、7、1）解：一、選擇題1.D 2.C 3.C 4.D 5.A 6.C 7.C 8.B 9.D 10.C二、填空題1、軸向拉伸或壓縮 剪切 扭轉(zhuǎn) 彎曲2、扭矩 Mn 用右手的四指表示扭矩Mn的轉(zhuǎn)向，拇指的指向離開截面則扭矩為正3、桿件軸線4、剪力5、零桿6、直線 斜直線7、斜直線 二次拋物線8、剪力 集中力9、彎矩 集中力偶10、力偶矩三、計(jì)算題：1、解：取截面左邊部分為研究對(duì)象：Fxi=0 FN1-2F=0得：FN1=2F(拉力)同理可得：FN2=0同理可得：FN3=F(拉力)繪制軸力圖。A B C D2F0F+2,3小題同上2、解（1）求支座反力：Fxi=0 FAX-40=0得：FAX40kN （ ）MA(F)=0 FBY420424020得：FBY60kN（）Fyi0 得：FAY20kN（）（2）作彎矩圖AC桿 MAC=0AC桿中截面彎矩 MEA80kNm(內(nèi)側(cè)受拉)MCA80kNm（內(nèi)側(cè)受拉）CD桿 MCD80kNm（內(nèi)側(cè)受拉）MDC0DB桿 MDBMBD03）作剪力圖用截面法求各桿端剪力AC桿：FQAC=40kN FQEC=FQCA=0CD桿：FQCD=20kN FQDC=60kN(4)作軸力圖同理，用截面法求各桿件軸力，作出桿件軸力圖第2小題，直接繪制內(nèi)力圖3、解（1）求支座反力：Fxi0 得：FAX=0MA(F)=0 FBY485420得：FBY=12kN()Fyi0 得：FAY=8kN()(2)畫受力圖，用假象截面在需求內(nèi)力處將梁分成兩部分，取其中一部分為研究對(duì)象，畫受力圖。(3)求內(nèi)力，畫受力圖FQ圖(kN)4、解：1）求支座反力Fyi0 得FCY3F()MB(F)=0 得：FAX=3F()Fxi0 得：FBX=3F()2）.取結(jié)點(diǎn)B為脫離體， FxB0 桿AB為零桿得桿BD的軸力 FNBD3F（拉力）取結(jié)點(diǎn)A為脫離體，桿AD為零桿， FxA0得桿AF軸力 FNAF3F（壓力）取結(jié)點(diǎn)D結(jié)點(diǎn)為脫離體得FD桿為零桿，即FD桿的軸力為0DE桿的軸力為3F（拉力）取結(jié)點(diǎn)F結(jié)點(diǎn)為脫離體FyF0 得FE桿件的軸力為 （壓力）FxF0 得FG桿件的軸力為 2F （壓力）一、選擇題：1.C 2.A 3.B 4.D 5.D6.C 7.C 8.D 9.C 10.D二、填空題1、常數(shù) 橫向變形系數(shù)2、等于3、幾乎不增加 增加4、彎矩 最遠(yuǎn)5、強(qiáng)度 剛度 穩(wěn)定性條件6、幾何變形 應(yīng)力與應(yīng)變的物理關(guān)系 靜力條件7、減小 降低8、長度系數(shù)9、大10、計(jì)算長度三、計(jì)算題2)求桿件應(yīng)力：2、解：1）圓環(huán)對(duì)形心軸x,y的慣性矩：2）矩形對(duì)圓環(huán)對(duì)形心軸x的慣性矩：矩形對(duì)圓環(huán)對(duì)形心軸y的慣性矩：一、選擇題1.B 2.D 3.D 4.C 5.A6.C 7.B 8.C 9.B 10.C二、填空題1、桿軸為直線2、位移3、軸力 4、荷載 力（力偶）5、反 反6、位移7、未知的結(jié)點(diǎn)角位移和未知的結(jié)點(diǎn)線位移8、單跨超靜定梁的組合體9、位移法10、轉(zhuǎn)動(dòng)their own conditions to develop the correct road, the maximum to avoid investment risk, gain profit.(three) vigorously promote the brand. To establish brand awareness, awareness of the use of brand, brand value, brand acquisition performance, enhance the competitive strength. Concentrated manpower, careful planning, packaging and publicity of a number of unique, market influence and coverage of the brand, the implementation of key breakthroughs, to enhance the competitive strength, walking business road the competition of alienation and characteristics, the pursuit of stability and development of the market.(four) to promote the integration of resources. To further broaden their horizons, effective integration of resources within the group, the city resources, other industries and regional resources, mutual trust, mutual benefit, seeking win-win principle, in the framework of national policies and regulations, strict inspection and argumentation, legal consultation, examination and approval procedures, strict regulation of economic activities, attract injection the social investment to the industry group, to achieve leveraging the development, ensure that the value of state-owned assets.(five) to strengthen the construction management personnel. Strengthen the management of education and training of cadres and workers of the existing business, firmly establish the concept of the market, enhance the sense of crisis to adapt to market competition, the sense of urgency, improve the ability to respond to market competition, improve management and operation of the market. At the same time, according to the need of industrial development, vigorously the introduction of high-quality management management personnel, and strive to build a high-quality professional management team, hard work, and promote the entire workforce knowledge structure, age structure, structure optimization and upgrading ability, enhance core competitiveness, adapt to the need of market competition.(six) seriously study the policy for policy. Serious research about social support the development of cultural undertakings in the country and the XX policy, especially the policy of industrial development, financial investment policy, financial policy and tax policy, and actively seek policy, projects and funds, enterprise and industry group mission to promote leapfrog development.