Building The Great Wall Of China.rar
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For a certain measuring point on the building surface, there are great differences in the extreme values of wind pressure under different wind directions. There are two reasons for the difference: one is that the extreme wind speeds at different wind directions are different, which is mainly related to the macro meteorology in the region, such as climate or cyclone type; the other is that the extreme wind pressure coefficients at different wind directions are different, which is mainly related to the environment around buildings and wind flow [24, 25]. The impact of wind on buildings and the surrounding environment is as follows: (1) in the area with dense high-rise buildings, the original wind field is changed by the buildings; under the same conditions, the local wind speed around the buildings increases; (2) wind load is a kind of random load, which is greatly affected by building height, wind direction, wind intensity, and duration; (3) the outer contour of a building is generally nonmanifold, so the flow field is inevitably accompanied by separated flow, vortex shedding and oscillation, and even more seriously, the coupling oscillation of structure and fluid; (4) the roughness of the building surface also affects the magnitude of the wind force, and the roughness of the building surface will also increase the effect of the wind force. The interaction between buildings and surrounding environment will be caused by wind. The shape, size, and number of buildings, the relative position of buildings, wind direction angle, wind field, and wind speed are all related to the mutual interference. The model described by formula (1) and the existing wind load calculation methods [18, 22, 23] do not fully involve these factors. In this paper, a series of factors of cognitive uncertainty are considered in the design of the algorithm model, so as to more comprehensively and accurately study the wind load estimation method considering wind direction, in which a series of factors of cognitive uncertainty include the wind-induced effect in short duration (bending moment, shear force, and displacement), the roughness degree of the representative landform of the upwind location of the building, the wind speed conversion factor , the wind speed , the site type , shape coefficient and wind pressure point correlation coefficient , local shape coefficient of wind pressure , and variation of wind pressure coefficient. With the progress of technique for the measurement of unsteady aerodynamic force , wind pressure distributions and unsteady aerodynamic characteristics are investigated and analyzed , and the local aerodynamic force coefficient  plays an important role in studying the characteristics of unsteady aerodynamic forces acting on a structure. Based on the above analysis, the obtained wind load calculation model is more comprehensive than (1). The wind load model proposed in this paper is given bywhere is the design wind load, is the extreme design wind speed related to wind angle , and is the extreme design wind pressure coefficient related to wind angle . is the aerodynamic force coefficient. is the local shape coefficient of wind pressure related to coherence of wind pressure.
According to Figures 9(b) and 10(b), the wind load values of the measuring points deployed at the junction of the left elevation I and the middle-inclined section 2 of the front elevation are shown in Table 6. The results show that the wind loads change greatly at the junction of the two outer inclined planes I and II (see Table 6 and Figure 13(c)), which is mainly due to the influence of incoming flow separation, reattachment, and vortex shedding. In the junction area of two inclined planes, the wind pressure exhibits strong non-Gaussian property, and the wind pressure of the measuring point in the structure surface area with strong non-Gaussian property is more sensitive to the change of wind direction angle and the surface structure of the building object.
The towers of the city went up into mist, great ladders of blurred light. Trains passed overhead, bright shrieking streaks. Massive walls of stone and glass fronted the streets above the race of cars and trolleys. Stone, steel, glass, electric light. No faces.
There were five men with him in the dark, softly padded body of the car. They pointed out landmarks, but in the fog he could not tell which great vague, fleeting building was the High Court and which the National Museum, which the Directorate and which the Senate. They crossed a river or estuary; the million lights of Nio Esseia, fog-diffused, trembled on dark water, behind them. The road darkened, the fog thickened, the driver slowed the vehicle's pace. Its lights shone on the mist ahead as if on a wall that kept retreating before them. Shevek sat leaning forward a little, gazing out. His eyes were not focused, nor was his mind, but he looked aloof and grave, and the other men talked quietly, respecting his silence.
The westering sun shining in on his face woke Shevek as the dirigible, clearing the last high pass of the Ne Theras, turned due south. He had slept most of the day, the third of the long journey. The night of the farewell party was half a world behind him. He yawned and rubbed his eyes and shook his head, trying to shake the deep rumble of the dirigible engine out of his ears, and then came wide awake, realizing that the journey was nearly over, that they must be coming close to Abbenay. He pressed his face to the dusty window, and sure enough, down there between two low rusty ridges was a great walled field, the Port. He gazed eagerly, trying to see if there was a spaceship on the pad. Despicable as Urras was, still it was another world; he wanted to see a ship from another world, a voyager across the dry and terrible abyss, a thing made by alien hands. But there was no ship in the Port.
The squares, the austere streets, the low buildings, the unwalled workyards, were charged with vitality and activity. As Shevek walked he was constantly aware of other people walking, working, talking, faces passing, voices calling, gossiping, singing, people alive, people doing things, people afoot. Workshops and factories fronted on squares or on their open yards, and their doors were open. He passed a glassworks, the workman dipping up a great molten blob as casually as a cook serves soup. Next to it was a busy yard where foamstone was cast for construction. The gang foreman, a big woman in a smock white with dust, was supervising the pouring of a cast with a loud and splendid flow of language. After that came a small wire factory, a district laundry, a luthier's where musical instruments were made and repaired, the district small-goods distributory, a theater, a tile works. The activity going on in each place was fascinating, and mostly out in full view. Children were around, some involved in the work with the adults, some underfoot making mudpies, some busy with games in the street, one sitting perched up on the roof of the learning center with her nose deep in a book. The wiremaker had decorated the shopfront with patterns of vines worked in painted wire, cheerful and ornate. The blast of steam and conversation from the wide-open doors of the laundry was overwhelming- No doors were locked, few shut. There were no disguises and no advertisements. It was all there, all the work, all the life of the city, open to the eye and to the hand. And every now and then down Depot Street a thing came careering by clanging a bell, a vehicle crammed full of people and with people festooned on stanchions all over the outside, old women cursing heartily as it failed to slow down at their stop so they could scramble off, a little boy on a homemade tricycle pursuing it madly, electric sparks showering blue from the overhead wires at crossings: as if that quiet intense vitality of the streets built up every now and then to discharge point, and leapt the gap with a crash and a blue crackle and the smell of ozone. These were the Abbenay omnibuses, and as they passed one felt like cheering.
He was sketching out notes for a series of hypotheses which led to a coherent theory of Simultaneity. But that began to seem a petty goal; there was a much greater one, a unified theory of Time, to be reached, if he could jost get to it. He felt that he was in a locked room in the middle of a great open country: it was all around him, if he could find the way out, the way clear. The intuition became an obsession. During that autumn and winter he got more and more out of the habit of sleeping. A couple of hours at night and a couple more sometime during the day were enough for him, and such naps were not the kind of profound sleep he had always had before, but almost a waking on another level, they were so full of dreams. He dreamed vividly, and the dreams were part of his work. He saw time turn back upon itself, a river flowing upward to the spring. He held the contemporaneity of two moments in his left and right hands; as he moved them apart he smiled to see the moments separate like dividing soap bubbles. He got up and scribbled down, without really waking, the mathematical formula that had been eluding him for days. He saw space shrink in upon him like the walls of a collapsing sphere driving in and in towards a central void, closing, closing, and he woke with a scream for help locked in his throat, struggling in silence to escape from the knowledge of his own eternal emptiness.
There was a long break between terms in midautumn. Most students went home for the holiday. Shevek went mountain-hiking in the Meiteis for a few days with a group of students and researchers from the Light Research Laboratory, then returned to claim some hours on the big computer, which was kept very busy during term. But, sick of work that got nowhere, he did not work hard. He slept more than usual, walked, read, and told himself that the trouble was he had simply been in too much of a hurry; you couldn't get hold of a whole new world in a few months. The lawns and groves of the University were beautiful and disheveled, gold leaves flaring and blowing on the rainy wind under a soft grey sky. Shevek looked up the works of the great loti poets and read them; he understood them now when they spoke of flowers, and birds flying, and the colors of forests in autumn. That understanding came as a great pleasure to him. It was pleasant to return at dusk to his room, whose calm beauty of proportion never failed to satisfy him. He was used to that grace and comfort now, it had become familiar to him. So had the faces at Evening Commons, the colleagues, some liked more and some less but all, by now, familiar. So had the food, in all its variety and quantity, which at first had staggered him. The men who waited tables knew his wants and served him as he would have served himself. He still did not eat meat; he had tried it, out of politeness and to prove to himself that he had no irrational prejudices, but his stomach had its reasons which reason does not know, and rebelled. After a couple of near disasters he had given up the attempt and remained a vegetarian, though a hearty one. He enjoyed dinner very much. He had gained three or four kilos since coming to Urras; he looked very well now, sunburnt from his mountain expedition, rested by the holiday. He was striking figure as he got up from table in the great dining hall, with its beamed ceiling far overhead in shadow, and its paneled, portrait-hung walls, and its tables bright with candle flames and porcelain and silver. He greeted someone at another table and moved on, with an expression of peaceable detachment. From across the room Chifoilisk saw him, and followed him, catching up at the door. 2b1af7f3a8