This article describes a way of special ultrasonic system which monitors thermal stress in seamless welded rails. this monitoring system is a non destructive testing system, which adopts avr mcu and high - precise time chip processing as the core of it, and adopts the critically refracted longitudinal wave as the object of measuring. my studying focuses on the theory of the monitoring system, which will be listed in this arctile : according to the snell theory, the theory of motivating of critically refracted longitudinal wave is described in details, and the finite element software is used to emulate the propagating course. the formulas of calculating the pts of swr are taken from the acoustoelasticity theory, and the calculating the parameters is introduced. according to assemble materials, three kinds of ways of monitoring the pts of swr using critically refracted longitudinal wave are described, which are measuring the sound - time in changeless distance, ultrasonic critical - angle refractomery and frequency spectrum, the first way of ways is used in this experiment system. the factors, which effect the monitoring system, are assaid in some degree based
本文的研究工作重點在無縫焊接
鋼軌溫度應力測量系統的理論模塊，包括根據snell原理，研究極限折射縱波的激發機理，並使用有限元軟體ansys進行模擬;根據聲彈性理論以及公式推導出計算無縫焊接
鋼軌中的溫度應力的公式，並對其中參數的求解方法進行介紹;根據收集的資料，介紹了三種使用極限折射縱波測量無縫焊接
鋼軌溫度應力的方法，即固定距離測量聲時法、臨界角折射法和頻譜分析法，本實驗系統使用的是第一種;根據實驗經驗以及相關資料，分析了影響極限折射縱波測量溫度應力的幾個因素，並提出了相應的解決方法;根據實驗系統的需要，獨立設計並加工出相關配套的實驗設備，包括實驗
鋼塊、有機玻璃
楔塊、固定件、載荷外框裝置等。
Because of its many advantages, the tapered portal frame is getting more and more application. ( ( technology code of light steel structure of portal frame ) ) ( cecs 102 : 2002 ), our country enacted, does n ' t define conditions that tapered portal frame needs anti - earthquak - e design. but mentions in illustration of rules : when earthquake fortification intensity is 7 degree, the portal frame does n ' t need anti - earthquake checking generally ; but for 8 degree and above, horizontal just with lengthways frames both need anti - earthquake checking
楔形變截面門式剛架山于其諸多的優點得到越來越廣泛的應用，我國頒布的協會標準《門式剛架輕型房屋
鋼結構技術規程》 （ cecs102 2002 ）中沒有對變截面門式剛架需要進行抗震設計的情況進行具體規定，但在後面的條文說明中提到： 「當抗震設防烈度為7度時，一般不需做抗震驗算；當為8度及以上時，橫向剛架和縱向框架均需做抗震驗算。 」
In - plane stability capacity of i - section aluminum alloy bars under eccentric compression
變截面
楔形工字
鋼簡支構件的平面外彈性穩定計算
A pointed tool, such as a spike or chisel, used for breaking rock or ore
鋼楔一種如尖鐵或鑿子等有尖的，用於劈裂巖石或砂石的工具
Gabled frames are widely used in industry and civil engineering, it ' s web plates " local buckling calculated formula in the technical specification for steel - structure of one - storey light - weight buildings with gabled frames ( cecs102 : 98 ) are based on the rectangular plates " and did n ' t consider the interaction of the fringe plate. so, there are some different between the actual members and the prescript of the specification, and the post - buckling strength ' s calculated formula is based on the local buckling ' s, it must have some unreasonable
楔形門式剛架廣泛地應用於工業與民用建築中， 《門式剛架輕型房屋
鋼結構技術規程》 （ cecs102 ： 98 ）中
楔形腹板局部屈曲的計算公式來自矩形板，並且沒有考慮翼緣的相關作用，因此，規程中的規定與構件的實際工作狀況有一定的差異，且屈曲后強度的計算公式也是以局部屈曲系數為基礎的，勢必有其不合理性。
Abstract : in this paper, based on a lot of testing and analyzing results at home and abroad, working principle and failure mechanism of concrete and reinforced concrete are put forward, strength theory - wedge cleaving theory of local pressure of concrete and reinforced concrete are set up, and calculation formula and simplified calculation method of local pressure strength are developed according to extreme balance principle
文摘:本文根據大量試驗和國內外資料分析結果，提出混凝土及
鋼筋混凝土局部承壓工作機理和破壞機構；建立混凝土及
鋼筋混凝土局部承壓的強度理論? ?
楔劈理論；並根據極限平衡原理導出局部承壓理論承載力計算公式和實用計算方法。
Bright key steel ; dimensions, permissible variations, weights
光亮
楔形
鋼.尺寸.允許偏差.重量
Square taper washers for high - strength structual bolting of steel channel sections
鋼結構u型梁高強度螺栓連接用四角
楔形墊圈
Abstract : earth pressure on a anchored pile sheet wall and a reinforced earth retaining wall, are obtained by prototype observation, finite element method and theoretical analysis. the results can be used as reference for lateral pressure of similar retaining structures
文摘:對一座錨拉式樁板墻和一座
楔形
鋼筋混凝土塊拉筋加筋土擋墻，將原型觀測、有限元計算、理論計算得到的土壓力進行分析和比較，所得結論可供設計類似支擋結構時計算土壓力參考。
Cunneiform connector for use with steel with ropes
鋼絲繩用
楔形接頭
Terminations for steel wire ropes - safety - asymmetric wedge socket
鋼絲繩接線端.安全.不對稱楔槽
