low-ductility steel 中文意思是什麼
low-ductility steel
解釋
低塑性鋼-
Based on these experiments, it may be claimed that there is segregation of sn to grain boundaries in 0. 15 % c steel during cooling from a high solution treatment temperature. this segregation reduces grain boundary cohesion, which results in low hot ductility and intergranular fracture
通過試驗和計算得出: sn在0 . 1swt . % c鋼中發生非平衡晶界偏聚的臨界時間為1245左右，臨界冷卻速率大約為8 / s ，與試驗結果基本一致。 -
In this thesis, four types of steel beam - rectangular cfst column connections, including normal welded flange plate ( wfp ) connection, bolted flange plate ( bfp ) connection, stiffened end plate ( sep ) connection and double split - tee plate ( dst ) connection, were designed based on the configuration of steel frame connection. total 8 models, 2 models of each kind of connections were tested under low - reversed cyclic loading at the end of cfst columns. the relationships between force and displacement at the end of columns, the relationships between the moment and rotation of the joints, degradations of strength and stiffness, ductility, failure mechanism and failure characteristics of these four connections under different axial - compression ratios were presented
本文借鑒鋼框架節點構造，設計了四種類型矩形鋼管混凝土柱與鋼梁連接節點，包括常規栓焊（ wfp ）節點、翼緣全螺栓連接（ bfp ）節點、雙t板連接（ dst ）節點以及加勁端板連接（ sep ）節點，進行了四類節點8個模型試件在柱端低周反復荷載作用下的抗震性能試驗研究，比較了不同軸壓比下節點的滯回性能、強度與剛度退化、延性、破壞機理與破壞特徵，主要結論有： 1 、節點的位移滯回曲線與轉角滯回曲線為塊型分佈，沒有或略有捏攏現象，耗能能力強； 2 、軸壓比對節點滯回曲線有顯著影響，全部節點都有顯著的剛度退化； 3 、位移與轉角骨架曲線在峰值荷載後有較長的水平或下降段，具有良好的延性性能； 4 、從整體抗震性能上看，翼緣全螺栓連接節點、雙t板連接與加勁端板連接節點都優于常規栓焊節點，可在實際工程中加以推廣。 -
Steel frame with welding joint easily occur brittle collapse because of having a low ductility at joints then ， a semi - rigid connected steel frame has large the energy absorption capacity which can resist dynamic loads and the using steel qualities of bracing system and joints are small so adopting a semi - rigid jointed steel frame is economical and stable but for semi - rigid connections are complex and variable ， in conventional analysis and design of steel structures ， it is usually assumed that the connections between columns and beams are either rigid or pinned the analysis of steel frames adopting the assumption can simplify the procedure of analysis and design ， but cannot precisely reflect structural practical circumstance and the errors of calculating results are large ， even ， get incorrect conclusions semi - rigid connection was referred to in chinese code for design of steel structures ( 2001 ， 10 ) ， however ， it isn ’ t specified how to apply semi - rigid joints in design in fact it cannot be carry out the purpose of the paper give a calculating method that accords practical engineering and easily put into effect worthwhile it is going to promote the development of semi - rigid jointed steel frame in design and heighten structural stability in the paper ， at first some commonly employed methods for the modeling of connection behavior are introduced richard abbott function modeling of connection is adopted for extended end plate bolted connection by the 34 test data comparing to regression analysis indicate richard - abbott function modeling of connection represents an excellent fit to test data then after a semi - rigid joint behavior can be modeled as a finite stiffness rotation spring ， base on rotation and displacement equation derive the element stiffness matrixes with semi - rigid connections where the effects ofj ointed flexibility geometric non - linearity and shear forces in the connection deformations have been considered in and fixed - end forces are modified finally, a program for calculating semi - rigid with incremental - iterative method has been
本文的目的就是為半剛性連接鋼框架的設計提供一種既符合工程實際又簡便易行的計算方法，供規范使用過程的補充、延伸或參考；同時，也將促進半剛性連接鋼框架設計技術的發展，為提高結構安全性能、節省工程成本發揮應有的作用。本文首先介紹了常見的幾種應用較為廣泛的樑柱連接彎矩轉角關系模型，在分析比較的基礎上，選用richard ? abbott函數模型作為外伸端板連接彎矩轉角關系模型，通過對34個外伸端板連接的實驗數據與回歸分析得到的參數比較可知，經回歸分析得到的此模型參數與實驗數據符合較好。然後用彈簧表徵連接點的轉動剛度，根據梁的轉角位移方程推導出半剛性連接的剛度矩陣，在單元剛度矩陣中考慮了節點柔性、幾何非線性和剪切變形的影響，並對固端力進行了修正，最後用增量迭代法編制有限元程序進行計算和分析。 -
The segregation mechanism of tramp element sn during continuous cooling and isothermal aging and its influence on the hot ductility of low carbon steel are discussed and the brittleness during continuous casting of the sn - doped low carbon steel is forecasted. at a strain rate of 10 - 2s - 1 and a cooling rate of 10 / s, there exists a third ductility trough for both steels at 750
在應變速率和冷卻速率分別為10 ~ （ - 2 ） s和10 s的條件下進行熱模擬拉伸時，兩種試驗鋼均在750時出現由先共析鐵素體沿奧氏體晶界呈薄膜網狀析出所引起的第類脆性谷底。 -
Low - ductility steel
低塑性鋼 -
Steel frame with welding joint easily occur brittle collapse because of having a low ductility at joints. then, a semi - rigid connected steel frame has large the energy absorption capacity which can resist dynamic loads and the using steel qualities of bracing system and joints are small. so adopting a semi - rigid jointed steel frame is economical and stable
採用焊接剛性節點的鋼框架因節點延性較差容易發生脆性破壞，而半剛接鋼框架因節點具有較強的耗能能力可以抵抗一定的地震荷載，同時還可以減少斜撐的數量及節點用鋼量，這使得半剛接鋼框架成為一種經濟、可靠的選擇。 -
In recent years, quite a lot of earthquakes in the world indicate that steel frames with welding joint easily occur brittle collapse because of having a low ductility at joints. then, a semi - rigid connected steel frame has large the energy absorption capacity which can resist dynamic loads
多次地震表明，採用完全焊接剛性節點的鋼框架因節點延性差、殘余應力大，容易發生脆性破壞，而半剛接鋼框架因節點具有較強的變形能力和耗能能力可以抵抗一定的地震荷載。 -
In this paper, two steel bracing - retrofitting methods are proposed for the rc frame structures, which are steel angels - at - four - corners method and embedded - steel framework method. two test models of one - story and two - bay reinforced concrete frame retrofitted with above two methods separately are designed and conducted low - cyclic reversed load tests, their aseismic behaviors such as strength, stiffness, ductility and energy - dissipating capability are studied
本文提出了兩種支撐抗震加固方法，即外包鋼支撐加固法和鋼內框支撐加固法；設計了兩榀單層兩跨鋼筋混凝土框架結構試驗模型，進行了水平低周反復荷載試驗，重點探討其強度、剛度、延性和耗能能力等抗震性能。 -
Based on a quasi - static test of two - lay - three - story concrete - filled rectangular steel tubular frame ( crstf ), ductility behavior, dissipation of seismic energy, degeneration of stiff and intensity of the crstf under low - frequency, horizontal, repeat load are analyzed. hysteretic curves to each floor of crstf between displacements and repeat loads, together with corresponding framework curve and resilience model to top floor of crstf is shown, too
本文基於一榀三層兩跨方鋼管混凝土框架擬靜力試驗，分析了低周反復水平荷載作用下框架的延性性能和強度與剛度的退化以及抗震耗能能力，給出了框架各層位移隨反復荷載變化的滯回曲線，並根據頂層滯回曲線進一步得出了框架頂層骨架曲線及相應的恢復力模型。
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