For the first time, based on frame structure with large thick raft plinth and many engineering examples, analytic method of interaction that means the analysis on three parts above as a whole with a full consideration of interaction thereof that met the need of the deformation correspond on the boundary was used to research on the interaction of structure and groundsill in this paper. and five models were adopted, which were : ( 1 ) a tube with symmetrical double - axis structure and symmetrical loads, ( 2 ) two tubes with symmetrical double - axis structure and symmetrical loads, and ( 3 ) a tube with symmetrical single - axis structure and symmetrical loads, and ( 4 ) two tubes with symmetrical double - axis structure and unsymmetrical loads, and ( 5 ) two tubes with unsymmetrical structure and loads. based on the middle - thick slab theory from mindli and the model for groundsill from winkle, the deformation character of raft foundation and the distributing rule for resisting force of fundus were studied in details by using b ig - style fem ( finite element member ) software, ansys
本文結合了大量的工程實例,以大底盤框架厚
筏結構形式為研究對象,針對單個和多個塔樓布置於同一個大底盤框架厚
筏基上的復雜結構體系,分( 1 )一個塔樓:結構布置雙軸對稱,
荷載對稱的情況; ( 2 )兩個塔樓:結構布置雙軸對稱,
荷載對稱的情況; ( 3 )一個塔樓:結構布置單軸對稱,
荷載對稱的情? ; ( 4 )兩個塔樓:結構布置雙軸對稱,
荷載不對稱的情況; ( 5 )兩個塔樓:結構布置和
荷載均不對稱的情況等五種組合情況,全面系統地探討了上部結構?基礎?地基相互作用的大跨度基礎、基礎板變形特徵及其基底反力的分佈規律。
So it is quite important for sfrc to be used in those essential parts, such as the vicinity of frame column or shear wall in basement. the sfrc greatly improves the punching shear carrying capacity in raft foundation, or reduces the thickness of raft foundation in the same load. this in turn offers convenience in construction, reduces hydration heat in concrete and saves investments
因此,將鋼纖維混凝土用於特別需要的那些部位顯得尤為重要,比如用於
筏形基礎的框架柱或剪力墻附近,大大提高基礎的抗沖切承載力,在
荷載一定的條件下可減小
筏板的厚度,將會給施工帶來方便,減少水化熱,節約建設投資。
In this paper, the allocation mode of the piles, that is sparse in the exterior and dense in the interior, and the optimized method based on the settlement control are proposed
本文提出了外疏內密的布樁方法和沉降控制優化方法,並就常規樁
筏基礎設計提出建議以及給出了樁
筏荷載分擔比計算公式。
From the beginning construction of the raft foundation to sealing roof during the overall construction procedure, the representative seven step loads are selected to apply to the simulating models
計算時重點選取了從
筏板施工開始至主樓結構封頂的全過程中具有代表性7次
荷載進行模擬。
Because interaction between pile - raft foundations and soil is very complex, what ' s more, there are many effect factors, piles and caps ( or rafts ) form a common working system whose bearing capacity and settlement are affected and restricted by interaction between them. the method of computing settlement that code provides is not a pure theoretic method and it is an experiential method in essence. in this paper, based on engineering designs of taiyuan, in - site experiments, observation data of structure settlement and so on, settlement is analyzed and computed by applying mindlin stress formula and using software matlab
現規范推薦的樁基沉降計算方法,並不是一種純理論的方法,其實質是一種經驗擬合的方法;本文結合太原地區的工程設計、現場試驗、主體沉降觀測資料等,運用明德林( mindlin )應力公式,然後按分層總和法原理,採用matlab軟體計算程序進行沉降計算、分析,結果表明:高層建築樁?
筏基礎沉降較小,且較均勻,得出了太原地區的樁?
筏基礎沉降計算的經驗系數_ p ,從而使設計、計算結果更接近於工程實際,同時考慮
筏板對上部結構
荷載的分擔是合理的、先進的,對高層建築樁?
筏基礎加強了認識。
According to the result of the field observation, the design by load equivalent simplification and plotting out representative local models following spatial strut - and - tie theory are obviously practical, recommendations for design on the basis of the result are put forward, including skipping rafts processing straight transmittal function so as to induce thickness of the plank and use of reinforced steel
實測結果表明,樁
筏基礎按空間桁架理論通過
荷載等效簡化並劃分成有代表性局部模型的設計方法是可行的,據此,提出了扣除直接傳遞的
荷載設計
筏板以減少板厚和配筋等相應的設計建議。
Based on optimal control theory and equivalent optimal control theory, the optimal control method of elastic floating raft under shock and stochastic load is studied and the optimal control method and optimal parameter design method of the nonautonomous rigid - elastic coupling floating raft system are established
摘要在理想最優控制理論和準最優控制理論的基礎上,對沖擊和隨機
荷載聯合作用下,彈性浮
筏系統的最優控制方法進行研究,建立了剛彈耦合非自治浮
筏系統的最優控制方法和最優參數設計方法。
Pile and raft take the load of buildings together. it possesses good whole, high vertical capacity, small settlement of foundation and well performance of balancing differential settlements. it could bear large wind or seismic induced horizon load, and could have large capacity of resisting inclination
樁
筏基礎同時具有樁基礎和
筏板基礎的優點,樁一
筏共同承擔建築物的
荷載,它具有整體性好、豎向承載力高、基礎沉降小、調節不均勻沉降能力強的優點,同時可以承受風
荷載或地震
荷載引起的巨大水平力,抗傾覆能力強。
In designing high - rise building, it is found that the bearing capacity of natural soil usually could not meet our requirement because of the very great vertical and horizontal loads which makes the piled raft foundation is in general use
高層建築設計中,垂直、水平荷載都很大,天然地基承載力往往不能滿足設計要求,從而使樁筏基礎成為被普遍採用的基礎形式。