الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
1- The simple least square method, with some experience in adjusting the initial force densities in the edge cable elements connected to the deviated cables and reanalyzing, the present developed program, has been proved to be more effective than the modified damped least square approach in reducing the deviations.
2- There is no effect for the absolute value of the force density in the edge cables on reducing the deviations of the net cables. This is because the reduction in the deviations of the internal edge cables depends on adjusting the relative values of the force densities in the edge cable elements connected to the deviated inner cable and not on the absolute values of the force density in these elements.
3- The design of cable nets with large deviations results in considerably higher internal forces (in some cases the increase in the internal forces in the interior cables reaches to 50010 and in the edge cables reaches to 30010 due to the presence of large deviations). This increase is attributed to the additional force components due to these deviations.
4- It is worthnoting that the effect of the deviations on the values of the internal forces depends on the cable net type where this effect in the tent cable net type, is very small compared with the saddle cable net type.
5- The big difference in the internal forces, an increase reaches in some cases to more than 50%, due to an error in length is localized in the elements of the cable which has an error in its unstrained length.
6- It is very clear that the difference in the internal forces due to an error in length gets bigger as the saglspan ratio gets smaller, small curvature. This result can be interpreted by considering the error in length in a certain cable as equivalent additional vertical loads acting on this cable resulting from the transverse cables connected with this cable. Therefore the effect of this error on a cable with small curvature, small sag/span ratio, is bigger than the effect of this error on a cable with big curvature. Moreover the effect of this error is localized in the cable which has an error in its length because this effect is concentrated along this cable as equivalent vertical loads while these vertical loads are distributed between the connected transverse cables.
7- The value of the prestressing force (high/typical) in the edge cables almost has no effect on the error percentage in the internal forces due to the error in length.
8- It is worthnoting that the percentage of error in the internal force due to an error in length in the case of irregular curvature is not so big as in the case of cable net of regular curvature.
9- The tent cable net type is not so sensitive to the error in length as the saddle shape cable net type.
10- Increasing the cable net curvature ”the first approach” is more effective than increasing the prestressing forces ”the second approach” in reducing the deflections due to vertical loads and in the same time the internal forces associated with the first approach are much lower than the internal forces associated with the second approach especially in the edge cables which in turn affects on the cost of cable net generally and the supporting system particularly.