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為( D ) 。 C.多余約束處的位移協(xié)調(diào)條件 37.力法典型方程中的系數(shù) ij? 代表基本結(jié)構(gòu)在( C)。( √ ) m m BA333.圖示多跨靜定梁僅 FD 段有內(nèi)力。( √ ) F PA B CD8.用平衡條件能求出全部?jī)?nèi)力的結(jié)構(gòu)是靜定結(jié)構(gòu)。( ╳ ) 112.圖示結(jié)構(gòu)有兩次超靜定。( ) 16.支座位移引起的超靜定結(jié)構(gòu)內(nèi)力,與各桿剛度的相對(duì)值有關(guān)。( √ ) 專業(yè)好文檔 4 19.同一結(jié)構(gòu)選不同的力法基本體系所得到的力法方程代表的位移條件不同。( √ ) 23.在荷載作用下,超靜定結(jié)構(gòu)的內(nèi)力分布與各桿剛度的絕對(duì)值 有關(guān)。( ) 27. 超靜定結(jié)構(gòu)的內(nèi)力狀態(tài)與 剛度 有關(guān) 。( √ ) 31.在力法計(jì)算時(shí),多余未知力由位移條件來求,其他未知力由平衡條件來求 。( √ ) 35 .溫度改變對(duì)超靜定結(jié)構(gòu)不產(chǎn)生內(nèi)力和反力。( √ ) 39.位移法的基本方程使用的是平衡條件,該方法只適用于解超靜定結(jié)構(gòu)。( √ ) 42. 位移法典型方程中的自由項(xiàng)是外因作用下附加約束上的反力。( ) AB 2?i 46 .下 圖所示 結(jié)構(gòu) 中兩支 座彎 矩的關(guān) 系是BA MM ? 。( ) 50.力矩分配法適用于連續(xù)梁和有側(cè)移剛架。( √ ) 54.在力矩分配法中,結(jié)點(diǎn)各桿端分配系數(shù)之和恒等于 1。( ) 58.能用位移法計(jì)算的結(jié)構(gòu)就一定能用力矩分配法計(jì)算。( ) BCA ii mkN?30 62.分配系數(shù) AB? 表示 A 節(jié)點(diǎn)作用單位力偶時(shí), AB 桿 A 端所分擔(dān)得的桿端彎矩。( √ ) 66.靜定結(jié)構(gòu)的內(nèi)力和反力影響線是直線或者折線組成。( √ ) 70.圖示結(jié)構(gòu) A 截面剪力影響線在 B處的豎標(biāo)為 1。 (√ ) A B Fy A + Fy Bl a b C lab1? 74.一般情況下,振動(dòng)體系的振動(dòng)自由度與超靜定次數(shù)無關(guān)。( √ ) EI= ∞ 78 .結(jié)構(gòu)的自振 頻率與質(zhì)量、剛度及荷載有關(guān)。 ( ) 82.弱阻尼自由振動(dòng)是一個(gè)衰減振動(dòng)。( ) 判斷題參考答案 ,按此力狀態(tài)及位移計(jì)算公式可求出 A 處的轉(zhuǎn)角。( ) qAlB q l 5.桁架結(jié)構(gòu)在結(jié)點(diǎn)荷載作用下,桿內(nèi)只有剪力。 ( √ ) 9. 支座 移動(dòng) 時(shí)靜定結(jié)構(gòu)發(fā)生的是剛體位移。(√) 13. 靜定多跨梁中基本部分、附屬部分的劃分與 桿件 的 剛度有 關(guān) 。 ( √ ) 。( √ ) 21.力法典型方程的等號(hào)右端項(xiàng)不一定為 0。( ) 25.超靜定結(jié)構(gòu)由于支座位移可以產(chǎn)生內(nèi)力。( ) 29.在力矩分配法中,當(dāng)遠(yuǎn)端為定向支座時(shí),其傳遞系數(shù)為 1。( √ )P =1A B C DE 33.靜定結(jié)構(gòu)彎矩影響線是由直線段組成的。( ) ll2 E IE I E I2 E IE IPF ( a) ( b) 37.在結(jié)構(gòu)動(dòng)力計(jì)算中,兩質(zhì)點(diǎn)的振動(dòng)體系,其振動(dòng)自由度一定為 2。( √ ) 41.由于弱阻尼,結(jié)構(gòu)的自由振動(dòng)不會(huì)衰減。 10kN 2m2m4m 參考答案: (1) 一次超靜定,基本體系和基本未知量,如圖( a)所示。 lllPF 參考答案: 基本體系及未知量如圖( a)所示。 X1 ( a)基本體 系 X1=1ll lFP2 ( b) 1M ( c) PM 668( d) M 圖( lFP /7) 01111 ??? PX? EIl 3/7 311 ?? ,EIPlP /2 31 ??? 7/61 PFX ? 用力法計(jì)算圖示結(jié)構(gòu),并畫 M 圖, EI=常數(shù)。 F PlF ( a) ( b) P PFlF lllP ( c) 力法解圖示結(jié)構(gòu),并作彎矩圖。 一半剛架彎矩圖如圖( d)所示。EI=常數(shù)。mF1P P lEIi? 典型方程 01111 ??? PFk ik 1111? mkN51 ???PF 用位移法計(jì)算圖示連續(xù)梁,列出位移法方程,求出系數(shù)項(xiàng)和自由項(xiàng)。 ll/2l/2EI=∞EI EIP 常 常 常 常 參考答案: 6i/l6i/l 6i/l6i/l 1M 8/lFP 8/lFP 8/lFPPM 典型方程 01111 ??? PFk 211 /24 lik ? 2/1 PP FF ?? 專業(yè)好文檔 7 Winger TuivasaSheck, who scored two tries in the Kiwis39。d give every award back in a heartbeat just to get across the line this weekend, said (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Baumgartner the disappointing news: Mission aborted. The supersonic descent could happen as early as Sunda. The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. They blew it in 2020 when they got caught cold in the final and they will not make the same mistake against the Kiwis in Manchester. Five years ago they cruised through to the final and so far history has repeated itself here the last try they conceded was scored by England